diff --git a/problems/0093.复原IP地址.md b/problems/0093.复原IP地址.md index 714dcb4f..7910fc50 100644 --- a/problems/0093.复原IP地址.md +++ b/problems/0093.复原IP地址.md @@ -455,6 +455,45 @@ var restoreIpAddresses = function(s) { }; ``` +## TypeScript + +```typescript +function isValidIpSegment(str: string): boolean { + let resBool: boolean = true; + let tempVal: number = Number(str); + if ( + str.length === 0 || isNaN(tempVal) || + tempVal > 255 || tempVal < 0 || + (str.length > 1 && str[0] === '0') + ) { + resBool = false; + } + return resBool; +} +function restoreIpAddresses(s: string): string[] { + const resArr: string[] = []; + backTracking(s, 0, []); + return resArr; + function backTracking(s: string, startIndex: number, route: string[]): void { + let length: number = s.length; + if (route.length === 4 && startIndex >= length) { + resArr.push(route.join('.')); + return; + } + if (route.length === 4 || startIndex >= length) return; + let tempStr: string = ''; + for (let i = startIndex + 1; i <= Math.min(length, startIndex + 3); i++) { + tempStr = s.slice(startIndex, i); + if (isValidIpSegment(tempStr)) { + route.push(s.slice(startIndex, i)); + backTracking(s, i, route); + route.pop(); + } + } + } +}; +``` + ## Go 回溯(对于前导 0的IP(特别注意s[startIndex]=='0'的判断,不应该写成s[startIndex]==0,因为s截取出来不是数字)) 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 41791114..dccc5404 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 @@ -185,6 +185,36 @@ class Solution { } ``` +双指针: + +```java +class Solution { +public static boolean backspaceCompare(String s, String t) { + char[] sarray = s.toCharArray(); + char[] tarray = t.toCharArray(); + return generate(sarray).equals(generate(tarray)); + } + public static String generate(char[] a){ + int slow = -1; + int fast = 0; + if(a.length == 1){ + return new String(a); + } else{ + for(fast = 0; fast < a.length; fast++){ + if(a[fast] != '#') + a[++slow] = a[fast]; + else{ + if(slow >= 0) + slow--; + } + } + return new String(a,0,slow + 1); + } + } +} +``` + + ### python