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更新 0454.四数相加II 排版格式修复
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@ -34,10 +34,12 @@
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1. (0, 0, 0, 1) -> A[0] + B[0] + C[0] + D[1] = 1 + (-2) + (-1) + 2 = 0
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2. (1, 1, 0, 0) -> A[1] + B[1] + C[0] + D[0] = 2 + (-1) + (-1) + 0 = 0
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## 算法公开课
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# 思路
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**[《代码随想录》算法视频公开课](https://programmercarl.com/other/gongkaike.html):[学透哈希表,map使用有技巧!LeetCode:454.四数相加II](https://www.bilibili.com/video/BV1Md4y1Q7Yh),相信结合视频再看本篇题解,更有助于大家对本题的理解**。
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本题视频讲解:[学透哈希表,map使用有技巧!LeetCode:454.四数相加II](https://www.bilibili.com/video/BV1Md4y1Q7Yh),结合视频在看本题解,事半功倍。
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## 思路
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本题咋眼一看好像和[0015.三数之和](https://programmercarl.com/0015.三数之和.html),[0018.四数之和](https://programmercarl.com/0018.四数之和.html)差不多,其实差很多。
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@ -92,8 +94,8 @@ 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 fourSumCount(int[] nums1, int[] nums2, int[] nums3, int[] nums4) {
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@ -117,8 +119,9 @@ class Solution {
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}
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```
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Python:
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### Python:
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(版本一) 使用字典
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```python
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class Solution(object):
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def fourSumCount(self, nums1, nums2, nums3, nums4):
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@ -179,7 +182,7 @@ class Solution:
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return cnt
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```
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Go:
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### Go:
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```go
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func fourSumCount(nums1 []int, nums2 []int, nums3 []int, nums4 []int) int {
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@ -201,7 +204,7 @@ func fourSumCount(nums1 []int, nums2 []int, nums3 []int, nums4 []int) int {
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}
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```
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javaScript:
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### JavaScript:
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```js
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/**
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@ -233,7 +236,7 @@ var fourSumCount = function(nums1, nums2, nums3, nums4) {
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};
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```
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TypeScript:
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### TypeScript:
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```typescript
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function fourSumCount(nums1: number[], nums2: number[], nums3: number[], nums4: number[]): number {
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@ -258,7 +261,7 @@ function fourSumCount(nums1: number[], nums2: number[], nums3: number[], nums4:
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};
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```
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PHP:
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### PHP:
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```php
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class Solution {
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@ -291,8 +294,8 @@ class Solution {
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}
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```
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### Swift:
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Swift:
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```swift
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func fourSumCount(_ nums1: [Int], _ nums2: [Int], _ nums3: [Int], _ nums4: [Int]) -> Int {
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// ab和: ab和出现次数
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@ -316,7 +319,8 @@ func fourSumCount(_ nums1: [Int], _ nums2: [Int], _ nums3: [Int], _ nums4: [Int]
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}
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```
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Rust:
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### Rust:
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```rust
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use std::collections::HashMap;
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impl Solution {
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@ -342,8 +346,8 @@ impl Solution {
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}
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```
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### Scala:
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Scala:
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```scala
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object Solution {
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// 导包
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@ -380,7 +384,8 @@ object Solution {
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}
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```
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C#:
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### C#:
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```csharp
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public int FourSumCount(int[] nums1, int[] nums2, int[] nums3, int[] nums4) {
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Dictionary<int, int> dic = new Dictionary<int, int>();
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@ -411,3 +416,4 @@ public int FourSumCount(int[] nums1, int[] nums2, int[] nums3, int[] nums4) {
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<a href="https://programmercarl.com/other/kstar.html" target="_blank">
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<img src="../pics/网站星球宣传海报.jpg" width="1000"/>
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</a>
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