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增加844. 比较含退格的字符串 JavaScript版本
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@ -232,6 +232,64 @@ func backspaceCompare(s string, t string) bool {
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```
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JavaScript:
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```javascript
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// 双栈
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var backspaceCompare = function(s, t) {
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const arrS = [], arrT = []; // 数组作为栈使用
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for(let char of s){
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char === '#' ? arrS.pop() : arrS.push(char);
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}
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for(let char of t){
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char === '#' ? arrT.pop() : arrT.push(char);
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}
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return arrS.join('') === arrT.join(''); // 比较两个字符串是否相等
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};
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//双栈精简
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var backspaceCompare = function(s, t) {
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const getString = s => {
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let arrS = [];
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for(let char of s){
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char === '#' ? arrS.pop() : arrS.push(char);
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}
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return arrS.join('');
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}
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return getString(s) === getString(t);
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};
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//双指针
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var backspaceCompare = function(s, t) {
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let sSkipNum = 0; // 记录s的#数量
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let tSkipNum = 0; // 记录t的#数量
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let i = s.length - 1, j = t.length - 1;
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while(true) {
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while(i >= 0){ // 从后向前,消除s的#
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if(s[i] === '#') sSkipNum++;
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else {
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if (sSkipNum > 0) sSkipNum--;
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else break;
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}
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i--;
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}
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while (j >= 0) { // 从后向前,消除t的#
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if (t[j] === '#') tSkipNum++;
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else {
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if (tSkipNum > 0) tSkipNum--;
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else break;
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}
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j--;
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}
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// 后半部分#消除完了,接下来比较s[i] != t[j]
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if (i < 0 || j < 0) break; // s 或者t 遍历到头了
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if (s[i] !== t[j]) return false;
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i--;j--;
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}
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// 说明s和t同时遍历完毕
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if (i == -1 && j == -1) return true;
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return false;
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};
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```
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-----------------------
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* 作者微信:[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
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