mirror of
https://github.com/youngyangyang04/leetcode-master.git
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Merge pull request #1274 from wangAlpha/master
添加 0053.最大子序和、0135分发糖果和0455分发饼干的 Rust版本
This commit is contained in:
@ -140,7 +140,7 @@ public:
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## 其他语言版本
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### Java
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### Java
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```java
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class Solution {
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public int maxSubArray(int[] nums) {
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@ -180,7 +180,7 @@ class Solution {
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}
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```
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### Python
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### Python
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```python
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class Solution:
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def maxSubArray(self, nums: List[int]) -> int:
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@ -195,7 +195,7 @@ class Solution:
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return result
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```
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### Go
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### Go
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```go
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func maxSubArray(nums []int) int {
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@ -212,6 +212,20 @@ func maxSubArray(nums []int) int {
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}
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```
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### Rust
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```rust
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pub fn max_sub_array(nums: Vec<i32>) -> i32 {
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let mut max_sum = i32::MIN;
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let mut curr = 0;
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for n in nums.iter() {
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curr += n;
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max_sum = max_sum.max(curr);
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curr = curr.max(0);
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}
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max_sum
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}
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```
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### Javascript:
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```Javascript
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var maxSubArray = function(nums) {
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|
@ -126,11 +126,11 @@ public:
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## 其他语言版本
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### Java
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### Java
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```java
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class Solution {
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/**
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分两个阶段
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/**
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分两个阶段
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1、起点下标1 从左往右,只要 右边 比 左边 大,右边的糖果=左边 + 1
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2、起点下标 ratings.length - 2 从右往左, 只要左边 比 右边 大,此时 左边的糖果应该 取本身的糖果数(符合比它左边大) 和 右边糖果数 + 1 二者的最大值,这样才符合 它比它左边的大,也比它右边大
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*/
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@ -160,7 +160,7 @@ class Solution {
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}
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```
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### Python
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### Python
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```python
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class Solution:
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def candy(self, ratings: List[int]) -> int:
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@ -213,6 +213,25 @@ func findMax(num1 int ,num2 int) int{
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}
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```
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### Rust
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```rust
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pub fn candy(ratings: Vec<i32>) -> i32 {
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let mut candies = vec![1i32; ratings.len()];
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for i in 1..ratings.len() {
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if ratings[i - 1] < ratings[i] {
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candies[i] = candies[i - 1] + 1;
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}
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}
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for i in (0..ratings.len()-1).rev() {
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if ratings[i] > ratings[i + 1] {
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candies[i] = candies[i].max(candies[i + 1] + 1);
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}
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}
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candies.iter().sum()
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}
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```
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### Javascript:
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```Javascript
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var candy = function(ratings) {
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@ -229,7 +248,7 @@ var candy = function(ratings) {
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candys[i] = Math.max(candys[i], candys[i + 1] + 1)
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}
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}
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let count = candys.reduce((a, b) => {
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return a + b
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})
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@ -201,6 +201,23 @@ func max(x, y int) int {
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}
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```
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Rust:
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```rust
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pub fn length_of_lis(nums: Vec<i32>) -> i32 {
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let mut dp = vec![1; nums.len() + 1];
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let mut result = 1;
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for i in 1..nums.len() {
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for j in 0..i {
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if nums[j] < nums[i] {
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dp[i] = dp[i].max(dp[j] + 1);
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}
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result = result.max(dp[i]);
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}
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}
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result
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}
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```
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Javascript
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```javascript
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const lengthOfLIS = (nums) => {
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|
@ -220,7 +220,7 @@ class Solution:
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for j in range(coin, amount + 1):
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dp[j] = min(dp[j], dp[j - coin] + 1)
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return dp[amount] if dp[amount] < amount + 1 else -1
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def coinChange1(self, coins: List[int], amount: int) -> int:
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'''版本二'''
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# 初始化
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@ -302,6 +302,24 @@ func min(a, b int) int {
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```
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Rust:
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```rust
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pub fn coin_change(coins: Vec<i32>, amount: i32) -> i32 {
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let amount = amount as usize;
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let mut dp = vec![i32::MAX; amount + 1];
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dp[0] = 0;
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for i in 0..coins.len() {
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for j in coins[i] as usize..=amount {
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if dp[j - coins[i] as usize] != i32::MAX {
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dp[j] = dp[j].min(dp[j - coins[i] as usize] + 1);
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}
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}
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}
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if dp[amount] == i32::MAX { -1 } else { dp[amount] }
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}
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```
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Javascript:
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```javascript
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const coinChange = (coins, amount) => {
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@ -106,7 +106,7 @@ public:
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## 其他语言版本
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### Java
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### Java
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```java
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class Solution {
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// 思路1:优先考虑饼干,小饼干先喂饱小胃口
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@ -145,7 +145,7 @@ class Solution {
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}
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```
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### Python
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### Python
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```python
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class Solution:
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# 思路1:优先考虑胃饼干
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@ -166,13 +166,13 @@ class Solution:
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s.sort()
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start, count = len(s) - 1, 0
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for index in range(len(g) - 1, -1, -1): # 先喂饱大胃口
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if start >= 0 and g[index] <= s[start]:
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if start >= 0 and g[index] <= s[start]:
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start -= 1
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count += 1
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return count
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```
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### Go
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### Go
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```golang
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//排序后,局部最优
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func findContentChildren(g []int, s []int) int {
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@ -191,7 +191,27 @@ func findContentChildren(g []int, s []int) int {
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}
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```
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### Javascript
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### Rust
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```rust
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pub fn find_content_children(children: Vec<i32>, cookie: Vec<i32>) -> i32 {
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let mut children = children;
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let mut cookies = cookie;
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children.sort();
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cookies.sort();
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let (mut child, mut cookie) = (0usize, 0usize);
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while child < children.len() && cookie < cookies.len() {
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// 优先选择最小饼干喂饱孩子
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if children[child] <= cookies[cookie] {
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child += 1;
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}
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cookie += 1
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}
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child as i32
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}
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```
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### Javascript
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```js
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var findContentChildren = function(g, s) {
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g = g.sort((a, b) => a - b)
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@ -203,7 +223,7 @@ var findContentChildren = function(g, s) {
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result++
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index--
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}
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}
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}
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return result
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};
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@ -251,7 +271,7 @@ function findContentChildren(g: number[], s: number[]): number {
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};
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```
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### C
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### C
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```c
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int cmp(int* a, int* b) {
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@ -261,7 +281,7 @@ int cmp(int* a, int* b) {
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int findContentChildren(int* g, int gSize, int* s, int sSize){
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if(sSize == 0)
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return 0;
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//将两个数组排序为升序
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qsort(g, gSize, sizeof(int), cmp);
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qsort(s, sSize, sizeof(int), cmp);
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@ -242,6 +242,22 @@ func change(amount int, coins []int) int {
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}
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```
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Rust:
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```rust
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pub fn change(amount: i32, coins: Vec<i32>) -> i32 {
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let amount = amount as usize;
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let coins = coins.iter().map(|&c|c as usize).collect::<Vec<usize>>();
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let mut dp = vec![0usize; amount + 1];
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dp[0] = 1;
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for i in 0..coins.len() {
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for j in coins[i]..=amount {
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dp[j] += dp[j - coins[i]];
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}
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}
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dp[amount] as i32
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}
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```
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Javascript:
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```javascript
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const change = (amount, coins) => {
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@ -218,6 +218,7 @@ class Solution:
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return result
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```
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> 贪心法:
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```python
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class Solution:
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@ -276,6 +277,24 @@ func findLengthOfLCIS(nums []int) int {
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}
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```
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Rust:
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```rust
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pub fn find_length_of_lcis(nums: Vec<i32>) -> i32 {
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if nums.is_empty() {
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return 0;
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}
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let mut result = 1;
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let mut dp = vec![1; nums.len()];
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for i in 1..nums.len() {
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if nums[i - 1] < nums[i] {
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dp[i] = dp[i - 1] + 1;
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result = result.max(dp[i]);
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}
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}
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result
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}
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```
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Javascript:
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> 动态规划:
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|
@ -111,7 +111,6 @@ class Solution:
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Golang:
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```go
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func maxUncrossedLines(A []int, B []int) int {
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m, n := len(A), len(B)
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dp := make([][]int, m+1)
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@ -140,7 +139,26 @@ func max(a, b int) int {
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}
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```
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Rust:
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```rust
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pub fn max_uncrossed_lines(nums1: Vec<i32>, nums2: Vec<i32>) -> i32 {
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let (n, m) = (nums1.len(), nums2.len());
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let mut last = vec![0; m + 1]; // 记录滚动数组
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let mut dp = vec![0; m + 1];
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for i in 1..=n {
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dp.swap_with_slice(&mut last);
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for j in 1..=m {
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if nums1[i - 1] == nums2[j - 1] {
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dp[j] = last[j - 1] + 1;
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} else {
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dp[j] = last[j].max(dp[j - 1]);
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}
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}
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}
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dp[m]
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}
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```
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JavaScript:
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|
@ -4,40 +4,40 @@
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</a>
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<p align="center"><strong><a href="https://mp.weixin.qq.com/s/tqCxrMEU-ajQumL1i8im9A">参与本项目</a>,贡献其他语言版本的代码,拥抱开源,让更多学习算法的小伙伴们收益!</strong></p>
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## 1143.最长公共子序列
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## 1143.最长公共子序列
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[力扣题目链接](https://leetcode-cn.com/problems/longest-common-subsequence/)
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给定两个字符串 text1 和 text2,返回这两个字符串的最长公共子序列的长度。
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给定两个字符串 text1 和 text2,返回这两个字符串的最长公共子序列的长度。
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一个字符串的 子序列 是指这样一个新的字符串:它是由原字符串在不改变字符的相对顺序的情况下删除某些字符(也可以不删除任何字符)后组成的新字符串。
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一个字符串的 子序列 是指这样一个新的字符串:它是由原字符串在不改变字符的相对顺序的情况下删除某些字符(也可以不删除任何字符)后组成的新字符串。
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例如,"ace" 是 "abcde" 的子序列,但 "aec" 不是 "abcde" 的子序列。两个字符串的「公共子序列」是这两个字符串所共同拥有的子序列。
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例如,"ace" 是 "abcde" 的子序列,但 "aec" 不是 "abcde" 的子序列。两个字符串的「公共子序列」是这两个字符串所共同拥有的子序列。
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若这两个字符串没有公共子序列,则返回 0。
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若这两个字符串没有公共子序列,则返回 0。
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示例 1:
|
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示例 1:
|
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输入:text1 = "abcde", text2 = "ace"
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输出:3
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解释:最长公共子序列是 "ace",它的长度为 3。
|
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输入:text1 = "abcde", text2 = "ace"
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输出:3
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解释:最长公共子序列是 "ace",它的长度为 3。
|
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|
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示例 2:
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输入:text1 = "abc", text2 = "abc"
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输出:3
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解释:最长公共子序列是 "abc",它的长度为 3。
|
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示例 2:
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输入:text1 = "abc", text2 = "abc"
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输出:3
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解释:最长公共子序列是 "abc",它的长度为 3。
|
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|
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示例 3:
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输入:text1 = "abc", text2 = "def"
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输出:0
|
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解释:两个字符串没有公共子序列,返回 0。
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示例 3:
|
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输入:text1 = "abc", text2 = "def"
|
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输出:0
|
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解释:两个字符串没有公共子序列,返回 0。
|
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|
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提示:
|
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提示:
|
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* 1 <= text1.length <= 1000
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* 1 <= text2.length <= 1000
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输入的字符串只含有小写英文字符。
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||||
|
||||
## 思路
|
||||
## 思路
|
||||
|
||||
本题和[动态规划:718. 最长重复子数组](https://programmercarl.com/0718.最长重复子数组.html)区别在于这里不要求是连续的了,但要有相对顺序,即:"ace" 是 "abcde" 的子序列,但 "aec" 不是 "abcde" 的子序列。
|
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|
||||
@ -45,21 +45,21 @@
|
||||
|
||||
1. 确定dp数组(dp table)以及下标的含义
|
||||
|
||||
dp[i][j]:长度为[0, i - 1]的字符串text1与长度为[0, j - 1]的字符串text2的最长公共子序列为dp[i][j]
|
||||
dp[i][j]:长度为[0, i - 1]的字符串text1与长度为[0, j - 1]的字符串text2的最长公共子序列为dp[i][j]
|
||||
|
||||
有同学会问:为什么要定义长度为[0, i - 1]的字符串text1,定义为长度为[0, i]的字符串text1不香么?
|
||||
有同学会问:为什么要定义长度为[0, i - 1]的字符串text1,定义为长度为[0, i]的字符串text1不香么?
|
||||
|
||||
这样定义是为了后面代码实现方便,如果非要定义为为长度为[0, i]的字符串text1也可以,大家可以试一试!
|
||||
|
||||
2. 确定递推公式
|
||||
|
||||
主要就是两大情况: text1[i - 1] 与 text2[j - 1]相同,text1[i - 1] 与 text2[j - 1]不相同
|
||||
主要就是两大情况: text1[i - 1] 与 text2[j - 1]相同,text1[i - 1] 与 text2[j - 1]不相同
|
||||
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如果text1[i - 1] 与 text2[j - 1]相同,那么找到了一个公共元素,所以dp[i][j] = dp[i - 1][j - 1] + 1;
|
||||
如果text1[i - 1] 与 text2[j - 1]相同,那么找到了一个公共元素,所以dp[i][j] = dp[i - 1][j - 1] + 1;
|
||||
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||||
如果text1[i - 1] 与 text2[j - 1]不相同,那就看看text1[0, i - 2]与text2[0, j - 1]的最长公共子序列 和 text1[0, i - 1]与text2[0, j - 2]的最长公共子序列,取最大的。
|
||||
|
||||
即:dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
|
||||
即:dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
|
||||
|
||||
代码如下:
|
||||
|
||||
@ -71,9 +71,9 @@ if (text1[i - 1] == text2[j - 1]) {
|
||||
}
|
||||
```
|
||||
|
||||
3. dp数组如何初始化
|
||||
3. dp数组如何初始化
|
||||
|
||||
先看看dp[i][0]应该是多少呢?
|
||||
先看看dp[i][0]应该是多少呢?
|
||||
|
||||
test1[0, i-1]和空串的最长公共子序列自然是0,所以dp[i][0] = 0;
|
||||
|
||||
@ -101,7 +101,7 @@ vector<vector<int>> dp(text1.size() + 1, vector<int>(text2.size() + 1, 0));
|
||||
|
||||

|
||||
|
||||
最后红框dp[text1.size()][text2.size()]为最终结果
|
||||
最后红框dp[text1.size()][text2.size()]为最终结果
|
||||
|
||||
以上分析完毕,C++代码如下:
|
||||
|
||||
@ -158,7 +158,7 @@ class Solution:
|
||||
for i in range(1, len2):
|
||||
for j in range(1, len1): # 开始列出状态转移方程
|
||||
if text1[j-1] == text2[i-1]:
|
||||
dp[i][j] = dp[i-1][j-1]+1
|
||||
dp[i][j] = dp[i-1][j-1]+1
|
||||
else:
|
||||
dp[i][j] = max(dp[i-1][j], dp[i][j-1])
|
||||
return dp[-1][-1]
|
||||
@ -189,10 +189,32 @@ func longestCommonSubsequence(text1 string, text2 string) int {
|
||||
|
||||
func max(a,b int)int {
|
||||
if a>b{
|
||||
return a
|
||||
return a
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
Rust:
|
||||
```rust
|
||||
pub fn longest_common_subsequence(text1: String, text2: String) -> i32 {
|
||||
let (n, m) = (text1.len(), text2.len());
|
||||
let (s1, s2) = (text1.as_bytes(), text2.as_bytes());
|
||||
let mut dp = vec![0; m + 1];
|
||||
let mut last = vec![0; m + 1];
|
||||
for i in 1..=n {
|
||||
dp.swap_with_slice(&mut last);
|
||||
for j in 1..=m {
|
||||
dp[j] = if s1[i - 1] == s2[j - 1] {
|
||||
last[j - 1] + 1
|
||||
} else {
|
||||
last[j].max(dp[j - 1])
|
||||
};
|
||||
}
|
||||
}
|
||||
dp[m]
|
||||
}
|
||||
```
|
||||
|
||||
Javascript:
|
||||
|
Reference in New Issue
Block a user