From d164c86ac418de56e18ab6edb7578e896d5cb892 Mon Sep 17 00:00:00 2001 From: zhangjiong Date: Mon, 17 Jan 2022 01:23:41 +0800 Subject: [PATCH 01/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200344.=E5=8F=8D?= =?UTF-8?q?=E8=BD=AC=E5=AD=97=E7=AC=A6=E4=B8=B2=20C#=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0344.反转字符串.md | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/problems/0344.反转字符串.md b/problems/0344.反转字符串.md index 9176c915..920cd86c 100644 --- a/problems/0344.反转字符串.md +++ b/problems/0344.反转字符串.md @@ -232,6 +232,19 @@ void reverseString(char* s, int sSize){ } ``` +C#： +```csharp +public class Solution +{ + public void ReverseString(char[] s) + { + for (int i = 0, j = s.Length - 1; i < j; i++, j--) + { + (s[i], s[j]) = (s[j], s[i]); + } + } +} +``` -----------------------
From 1f00889410d44ab517b7cdd76ace801b18ed7361 Mon Sep 17 00:00:00 2001 From: zhangjiong Date: Mon, 17 Jan 2022 01:30:46 +0800 Subject: [PATCH 02/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200541.=E5=8F=8D?= =?UTF-8?q?=E8=BD=AC=E5=AD=97=E7=AC=A6=E4=B8=B2II=20C#=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0541.反转字符串II.md | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/problems/0541.反转字符串II.md b/problems/0541.反转字符串II.md index fb92b1e4..1338cd0d 100644 --- a/problems/0541.反转字符串II.md +++ b/problems/0541.反转字符串II.md @@ -272,9 +272,21 @@ func reverseStr(_ s: String, _ k: Int) -> String { } ``` - - - +C#： +```csharp +public class Solution +{ + public string ReverseStr(string s, int k) + { + Span span = s.ToCharArray().AsSpan(); + for (int i = 0; i < span.Length; i += 2 * k) + { + span[i + k < span.Length ? i..(i + k) : i..].Reverse(); + } + return span.ToString(); + } +} +``` -----------------------
From b1a0fbad2b4799416bd45a297f67df93eca4612b Mon Sep 17 00:00:00 2001 From: zhangjiong Date: Mon, 17 Jan 2022 11:53:23 +0800 Subject: [PATCH 03/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200015.=E4=B8=89?= =?UTF-8?q?=E6=95=B0=E4=B9=8B=E5=92=8C=20C#=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0015.三数之和.md | 59 +++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/problems/0015.三数之和.md b/problems/0015.三数之和.md index c78ab06d..19e19e43 100644 --- a/problems/0015.三数之和.md +++ b/problems/0015.三数之和.md @@ -509,5 +509,64 @@ int** threeSum(int* nums, int numsSize, int* returnSize, int** returnColumnSizes } ``` +C#: +```csharp +public class Solution +{ + public IList> ThreeSum(int[] nums) + { + var result = new List>(); + + Array.Sort(nums); + + for (int i = 0; i < nums.Length - 2; i++) + { + int n1 = nums[i]; + + if (n1 > 0) + break; + + if (i > 0 && n1 == nums[i - 1]) + continue; + + int left = i + 1; + int right = nums.Length - 1; + + while (left < right) + { + int n2 = nums[left]; + int n3 = nums[right]; + int sum = n1 + n2 + n3; + + if (sum > 0) + { + right--; + } + else if (sum < 0) + { + left++; + } + else + { + result.Add(new List { n1, n2, n3 }); + + while (left < right && nums[left] == n2) + { + left++; + } + + while (left < right && nums[right] == n3) + { + right--; + } + } + } + } + + return result; + } +} +``` + -----------------------
From e4537379854fc4943f7d0a48df9168dd647f8ba8 Mon Sep 17 00:00:00 2001 From: zhangjiong Date: Mon, 17 Jan 2022 15:17:23 +0800 Subject: [PATCH 04/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200018.=E5=9B=9B?= =?UTF-8?q?=E6=95=B0=E4=B9=8B=E5=92=8C=20C#=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0018.四数之和.md | 62 +++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/problems/0018.四数之和.md b/problems/0018.四数之和.md index b94ebeef..0a04cd68 100644 --- a/problems/0018.四数之和.md +++ b/problems/0018.四数之和.md @@ -403,5 +403,67 @@ func fourSum(_ nums: [Int], _ target: Int) -> [[Int]] { } ``` +C#: +```csharp +public class Solution +{ + public IList> FourSum(int[] nums, int target) + { + var result = new List>(); + + Array.Sort(nums); + + for (int i = 0; i < nums.Length - 3; i++) + { + int n1 = nums[i]; + if (i > 0 && n1 == nums[i - 1]) + continue; + + for (int j = i + 1; j < nums.Length - 2; j++) + { + int n2 = nums[j]; + if (j > i + 1 && n2 == nums[j - 1]) + continue; + + int left = j + 1; + int right = nums.Length - 1; + + while (left < right) + { + int n3 = nums[left]; + int n4 = nums[right]; + int sum = n1 + n2 + n3 + n4; + + if (sum > target) + { + right--; + } + else if (sum < target) + { + left++; + } + else + { + result.Add(new List { n1, n2, n3, n4 }); + + while (left < right && nums[left] == n3) + { + left++; + } + + while (left < right && nums[right] == n4) + { + right--; + } + } + } + } + } + + return result; + } +} +``` + -----------------------
From d941915829f122e717190d3712d1fba7b3fbde32 Mon Sep 17 00:00:00 2001 From: chengleqi Date: Mon, 17 Jan 2022 22:07:48 +0800 Subject: [PATCH 05/13] =?UTF-8?q?update=200051.N=E7=9A=87=E5=90=8E.md=20Go?= =?UTF-8?q?=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0051.N皇后.md | 109 +++++++++++++++++---------------------- 1 file changed, 48 insertions(+), 61 deletions(-) diff --git a/problems/0051.N皇后.md b/problems/0051.N皇后.md index 51415e88..7eb0d7a0 100644 --- a/problems/0051.N皇后.md +++ b/problems/0051.N皇后.md @@ -346,69 +346,56 @@ class Solution { ### Go ```Go -import "strings" -var res [][]string - -func isValid(board [][]string, row, col int) (res bool){ - n := len(board) - for i:=0; i < row; i++ { - if board[i][col] == "Q" { - return false - } - } - for i := 0; i < n; i++{ - if board[row][i] == "Q" { - return false - } - } - - for i ,j := row, col; i >= 0 && j >=0 ; i, j = i - 1, j- 1{ - if board[i][j] == "Q"{ - return false - } - } - for i, j := row, col; i >=0 && j < n; i,j = i-1, j+1 { - if board[i][j] == "Q" { - return false - } - } - return true -} - -func backtrack(board [][]string, row int) { - size := len(board) - if row == size{ - temp := make([]string, size) - for i := 0; i= 0 && j >= 0; i, j = i-1, j-1 { + if chessboard[i][j] == "Q" { + return false + } + } + for i, j := row-1, col+1; i >= 0 && j < n; i, j = i-1, j+1 { + if chessboard[i][j] == "Q" { + return false + } + } + return true } ``` ### Javascript From a2ac3fa4310f001758f6e08d8874164932ca4f04 Mon Sep 17 00:00:00 2001 From: Steve2020 <841532108@qq.com> Date: Tue, 18 Jan 2022 13:00:33 +0800 Subject: [PATCH 06/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=EF=BC=880151.=E7=BF=BB?= =?UTF-8?q?=E8=BD=AC=E5=AD=97=E7=AC=A6=E4=B8=B2=E9=87=8C=E7=9A=84=E5=8D=95?= =?UTF-8?q?=E8=AF=8D.md=EF=BC=89=EF=BC=9A=E5=A2=9E=E5=8A=A0typescript?= =?UTF-8?q?=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0151.翻转字符串里的单词.md | 59 ++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/problems/0151.翻转字符串里的单词.md b/problems/0151.翻转字符串里的单词.md index 48324cd9..fc25c718 100644 --- a/problems/0151.翻转字符串里的单词.md +++ b/problems/0151.翻转字符串里的单词.md @@ -553,6 +553,65 @@ function reverse(strArr, start, end) { } ``` +TypeScript： + +```typescript +function reverseWords(s: string): string { + /** Utils **/ + // 删除多余空格, 如' hello world ' => 'hello world' + function delExtraSpace(arr: string[]): void { + let left: number = 0, + right: number = 0, + length: number = arr.length; + while (right < length && arr[right] === ' ') { + right++; + } + while (right < length) { + if (arr[right] === ' ' && arr[right - 1] === ' ') { + right++; + continue; + } + arr[left++] = arr[right++]; + } + if (arr[left - 1] === ' ') { + arr.length = left - 1; + } else { + arr.length = left; + } + } + // 翻转字符串，如：'hello' => 'olleh' + function reverseWords(strArr: string[], start: number, end: number) { + let temp: string; + while (start < end) { + temp = strArr[start]; + strArr[start] = strArr[end]; + strArr[end] = temp; + start++; + end--; + } + } + + /** Main code **/ + let strArr: string[] = s.split(''); + delExtraSpace(strArr); + let length: number = strArr.length; + // 翻转整个字符串 + reverseWords(strArr, 0, length - 1); + let start: number = 0, + end: number = 0; + while (start < length) { + end = start; + while (strArr[end] !== ' ' && end < length) { + end++; + } + // 翻转单个单词 + reverseWords(strArr, start, end - 1); + start = end + 1; + } + return strArr.join(''); +}; +``` + Swift: ```swift From 3d0ce431d83ac814ab8479d9392c6a6e5e022366 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9E=81=E5=AE=A2=E5=AD=A6=E4=BC=9F?= Date: Tue, 18 Jan 2022 13:18:36 +0800 Subject: [PATCH 07/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20110.=E5=B9=B3?= =?UTF-8?q?=E8=A1=A1=E4=BA=8C=E5=8F=89=E6=A0=91=20Swift=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0110.平衡二叉树.md | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/problems/0110.平衡二叉树.md b/problems/0110.平衡二叉树.md index c0914f05..9d43407a 100644 --- a/problems/0110.平衡二叉树.md +++ b/problems/0110.平衡二叉树.md @@ -730,5 +730,33 @@ bool isBalanced(struct TreeNode* root){ } ``` +## Swift: + +>递归 +```swift +func isBalanced(_ root: TreeNode?) -> Bool { + // -1 已经不是平衡二叉树 + return getHeight(root) == -1 ? false : true +} +func getHeight(_ root: TreeNode?) -> Int { + guard let root = root else { + return 0 + } + let leftHeight = getHeight(root.left) + if leftHeight == -1 { + return -1 + } + let rightHeight = getHeight(root.right) + if rightHeight == -1 { + return -1 + } + if abs(leftHeight - rightHeight) > 1 { + return -1 + } else { + return 1 + max(leftHeight, rightHeight) + } +} +``` + -----------------------
From d1a5c9cc908e78ffdb82f5acf6a2ff297254e2fa Mon Sep 17 00:00:00 2001 From: Steve2020 <841532108@qq.com> Date: Tue, 18 Jan 2022 13:25:50 +0800 Subject: [PATCH 08/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=EF=BC=88=E5=89=91?= =?UTF-8?q?=E6=8C=87Offer58-II.=E5=B7=A6=E6=97=8B=E8=BD=AC=E5=AD=97?= =?UTF-8?q?=E7=AC=A6=E4=B8=B2.md=EF=BC=89=EF=BC=9A=E5=A2=9E=E5=8A=A0typesc?= =?UTF-8?q?ript=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../剑指Offer58-II.左旋转字符串.md | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/problems/剑指Offer58-II.左旋转字符串.md b/problems/剑指Offer58-II.左旋转字符串.md index c391d661..2fbd2888 100644 --- a/problems/剑指Offer58-II.左旋转字符串.md +++ b/problems/剑指Offer58-II.左旋转字符串.md @@ -209,6 +209,31 @@ var reverseLeftWords = function(s, n) { }; ``` +TypeScript： + +```typescript +function reverseLeftWords(s: string, n: number): string { + /** Utils */ + function reverseWords(strArr: string[], start: number, end: number): void { + let temp: string; + while (start < end) { + temp = strArr[start]; + strArr[start] = strArr[end]; + strArr[end] = temp; + start++; + end--; + } + } + /** Main code */ + let strArr: string[] = s.split(''); + let length: number = strArr.length; + reverseWords(strArr, 0, length - 1); + reverseWords(strArr, 0, length - n - 1); + reverseWords(strArr, length - n, length - 1); + return strArr.join(''); +}; +``` + Swift: ```swift From 76893360a9bc77a61ac0f620441680f4ba56a3d9 Mon Sep 17 00:00:00 2001 From: Steve2020 <841532108@qq.com> Date: Tue, 18 Jan 2022 13:30:39 +0800 Subject: [PATCH 09/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=EF=BC=88=E5=89=91?= =?UTF-8?q?=E6=8C=87Offer58-II.=E5=B7=A6=E6=97=8B=E8=BD=AC=E5=AD=97?= =?UTF-8?q?=E7=AC=A6=E4=B8=B2.md=EF=BC=89=EF=BC=9AJS=E7=89=88=E6=9C=AC?= =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=96=B0=E8=A7=A3=E6=B3=95?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../剑指Offer58-II.左旋转字符串.md | 30 +++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/problems/剑指Offer58-II.左旋转字符串.md b/problems/剑指Offer58-II.左旋转字符串.md index 2fbd2888..61391274 100644 --- a/problems/剑指Offer58-II.左旋转字符串.md +++ b/problems/剑指Offer58-II.左旋转字符串.md @@ -209,6 +209,36 @@ var reverseLeftWords = function(s, n) { }; ``` +版本二（在原字符串上操作）： + +```js +/** + * @param {string} s + * @param {number} n + * @return {string} + */ +var reverseLeftWords = function (s, n) { + /** Utils */ + function reverseWords(strArr, start, end) { + let temp; + while (start < end) { + temp = strArr[start]; + strArr[start] = strArr[end]; + strArr[end] = temp; + start++; + end--; + } + } + /** Main code */ + let strArr = s.split(''); + let length = strArr.length; + reverseWords(strArr, 0, length - 1); + reverseWords(strArr, 0, length - n - 1); + reverseWords(strArr, length - n, length - 1); + return strArr.join(''); +}; +``` + TypeScript： ```typescript From 5a3be18f127f97bce75a45e473381d1fe3206a94 Mon Sep 17 00:00:00 2001 From: leeeeeeewii <54872662+leeeeeeewii@users.noreply.github.com> Date: Wed, 19 Jan 2022 22:18:56 +0800 Subject: [PATCH 10/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A00844.=E6=AF=94=E8=BE=83?= =?UTF-8?q?=E5=90=AB=E9=80=80=E6=A0=BC=E7=9A=84=E5=AD=97=E7=AC=A6=E4=B8=B2?= =?UTF-8?q?=20python=20go=E5=8F=8C=E6=8C=87=E9=92=88=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0844.比较含退格的字符串.md | 81 ++++++++++++++++++++ 1 file changed, 81 insertions(+) diff --git a/problems/0844.比较含退格的字符串.md b/problems/0844.比较含退格的字符串.md index 5d629a8c..00d52e42 100644 --- a/problems/0844.比较含退格的字符串.md +++ b/problems/0844.比较含退格的字符串.md @@ -205,6 +205,42 @@ class Solution: return self.get_string(s) == self.get_string(t) pass ``` +双指针 +```python +class Solution: + def backspaceCompare(self, s: str, t: str) -> bool: + s_index, t_index = len(s) - 1, len(t) - 1 + s_backspace, t_backspace = 0, 0 # 记录s,t的#数量 + while s_index >= 0 or t_index >= 0: # 使用or，以防长度不一致 + while s_index >= 0: # 从后向前，消除s的# + if s[s_index] == '#': + s_index -= 1 + s_backspace += 1 + else: + if s_backspace > 0: + s_index -= 1 + s_backspace -= 1 + else: + break + while t_index >= 0: # 从后向前，消除t的# + if t[t_index] == '#': + t_index -= 1 + t_backspace += 1 + else: + if t_backspace > 0: + t_index -= 1 + t_backspace -= 1 + else: + break + if s_index >= 0 and t_index >= 0: # 后半部分#消除完了，接下来比较当前位的值 + if s[s_index] != t[t_index]: + return False + elif s_index >= 0 or t_index >= 0: # 一个字符串找到了待比较的字符，另一个没有，返回False + return False + s_index -= 1 + t_index -= 1 + return True +``` ### Go @@ -226,6 +262,51 @@ func backspaceCompare(s string, t string) bool { return getString(s) == getString(t) } +``` +双指针 +```go +func backspaceCompare(s string, t string) bool { + s_index, t_index := len(s) - 1, len(t) - 1 + s_backspace, t_backspace := 0, 0 // 记录s,t的#数量 + for s_index >= 0 || t_index >= 0 { // 使用or，以防长度不一致 + for s_index >= 0 { // 从后向前，消除s的# + if s[s_index] == '#' { + s_index-- + s_backspace++ + } else { + if s_backspace > 0 { + s_index-- + s_backspace-- + } else { + break + } + } + } + for t_index >= 0 { // 从后向前，消除t的# + if t[t_index] == '#' { + t_index-- + t_backspace++ + } else { + if t_backspace > 0 { + t_index-- + t_backspace-- + } else { + break + } + } + } + if s_index >= 0 && t_index >= 0 { // 后半部分#消除完了，接下来比较当前位的值 + if s[s_index] != t[t_index] { + return false + } + } else if s_index >= 0 || t_index >= 0 { // 一个字符串找到了待比较的字符，另一个没有，返回false + return false + } + s_index-- + t_index-- + } + return true +} ``` ### JavaScript From 0e75c5d92e619bffb60a63db4d606a492045b732 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9E=81=E5=AE=A2=E5=AD=A6=E4=BC=9F?= Date: Thu, 20 Jan 2022 20:32:17 +0800 Subject: [PATCH 11/13] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20257.=20=E4=BA=8C?= =?UTF-8?q?=E5=8F=89=E6=A0=91=E7=9A=84=E6=89=80=E6=9C=89=E8=B7=AF=E5=BE=84?= =?UTF-8?q?=20Swift=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0257.二叉树的所有路径.md | 65 +++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/problems/0257.二叉树的所有路径.md b/problems/0257.二叉树的所有路径.md index cb837d87..7b5fc2e9 100644 --- a/problems/0257.二叉树的所有路径.md +++ b/problems/0257.二叉树的所有路径.md @@ -581,7 +581,72 @@ var binaryTreePaths = function(root) { }; ``` +Swift: +> 递归/回溯 +```swift +func binaryTreePaths(_ root: TreeNode?) -> [String] { + var res = [String]() + guard let root = root else { + return res + } + var path = [Int]() + _binaryTreePaths(root, path: &path, res: &res) + return res +} +func _binaryTreePaths(_ root: TreeNode, path: inout [Int], res: inout [String]) { + path.append(root.val) + if root.left == nil && root.right == nil { + var str = "" + for i in 0 ..< path.count - 1 { + str.append("\(path[i])->") + } + str.append("\(path.last!)") + res.append(str) + return + } + if let left = root.left { + _binaryTreePaths(left, path: &path, res: &res) + path.removeLast() + } + if let right = root.right { + _binaryTreePaths(right, path: &path, res: &res) + path.removeLast() + } +} +``` + +> 迭代 +```swift +func binaryTreePaths(_ root: TreeNode?) -> [String] { + var res = [String]() + guard let root = root else { + return res + } + var stackNode = [TreeNode]() + stackNode.append(root) + + var stackStr = [String]() + stackStr.append("\(root.val)") + + while !stackNode.isEmpty { + let node = stackNode.popLast()! + let str = stackStr.popLast()! + if node.left == nil && node.right == nil { + res.append(str) + } + if let left = node.left { + stackNode.append(left) + stackStr.append("\(str)->\(left.val)") + } + if let right = node.right { + stackNode.append(right) + stackStr.append("\(str)->\(right.val)") + } + } + return res +} +``` -----------------------
From 1264fa87ac45c189ed9cc9caee88ef627c352e05 Mon Sep 17 00:00:00 2001 From: chengleqi Date: Fri, 21 Jan 2022 14:38:11 +0800 Subject: [PATCH 12/13] =?UTF-8?q?update=200063.=E4=B8=8D=E5=90=8C=E8=B7=AF?= =?UTF-8?q?=E5=BE=84II.md=20Go=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0063.不同路径II.md | 43 ++++++++++++--------------------- 1 file changed, 15 insertions(+), 28 deletions(-) diff --git a/problems/0063.不同路径II.md b/problems/0063.不同路径II.md index 6f405d6a..105b6402 100644 --- a/problems/0063.不同路径II.md +++ b/problems/0063.不同路径II.md @@ -266,46 +266,33 @@ Go： ```go func uniquePathsWithObstacles(obstacleGrid [][]int) int { - m,n:= len(obstacleGrid),len(obstacleGrid[0]) + m, n := len(obstacleGrid), len(obstacleGrid[0]) // 定义一个dp数组 - dp := make([][]int,m) - for i,_ := range dp { - dp[i] = make([]int,n) + dp := make([][]int, m) + for i, _ := range dp { + dp[i] = make([]int, n) } - // 初始化 - for i:=0;i Date: Sun, 23 Jan 2022 17:23:36 +0800 Subject: [PATCH 13/13] =?UTF-8?q?bug-fix=200494.=E7=9B=AE=E6=A0=87?= =?UTF-8?q?=E5=92=8C.md=20Go=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0494.目标和.md | 43 +++----------------------------------- 1 file changed, 3 insertions(+), 40 deletions(-) diff --git a/problems/0494.目标和.md b/problems/0494.目标和.md index 1835f498..0faef4a5 100644 --- a/problems/0494.目标和.md +++ b/problems/0494.目标和.md @@ -289,7 +289,7 @@ func findTargetSumWays(nums []int, target int) int { for _, v := range nums { sum += v } - if target > sum { + if abs(target) > sum { return 0 } if (sum+target)%2 == 1 { @@ -311,49 +311,12 @@ func findTargetSumWays(nums []int, target int) int { } return dp[bag] } -``` -> 更新版，上一个跑不通了，因为会存在bag 小于0的情况 -```go -func findTargetSumWays(nums []int, target int) int { - //先转化为数学问题 - //a-b=target - //a+b=sum - //a=(target+sum)/2 - //求出sum - var sum int - for _,value:=range nums{ - sum+=value - } - //如果sum {