@@ -399,6 +399,71 @@ var backspaceCompare = function(s, t) {
399399
400400```
401401
402+ ### TypeScript
403+ 404+ > 双栈法:
405+ 406+ ```typescript
407+ function backspaceCompare (s: string, t: string): boolean {
408+ const stack1: string[ ] = [ ] ,
409+ stack2: string[ ] = [ ] ;
410+ for (let c of s) {
411+ if (c === '#') {
412+ stack1.pop();
413+ } else {
414+ stack1.push(c);
415+ }
416+ }
417+ for (let c of t) {
418+ if (c === '#') {
419+ stack2.pop();
420+ } else {
421+ stack2.push(c);
422+ }
423+ }
424+ if (stack1.length !== stack2.length) return false;
425+ for (let i = 0, length = stack1.length; i < length; i++) {
426+ if (stack1[ i] !== stack2[ i] ) return false;
427+ }
428+ return true;
429+ };
430+ ```
431+
432+ > 双指针法:
433+
434+ ```typescript
435+ function backspaceCompare(s: string, t: string): boolean {
436+ let sIndex: number = s.length - 1,
437+ tIndex: number = t.length - 1;
438+ while (true) {
439+ sIndex = getIndexAfterDel(s, sIndex);
440+ tIndex = getIndexAfterDel(t, tIndex);
441+ if (sIndex < 0 || tIndex < 0) break;
442+ if (s[sIndex] !== t[tIndex]) return false;
443+ sIndex--;
444+ tIndex--;
445+ }
446+ return sIndex === -1 && tIndex === -1;
447+ };
448+ function getIndexAfterDel(s: string, startIndex: number): number {
449+ let backspaceNum: number = 0;
450+ while (startIndex >= 0) {
451+ // 不可消除
452+ if (s[startIndex] !== '#' && backspaceNum === 0) break;
453+ // 可消除
454+ if (s[startIndex] === '#') {
455+ backspaceNum++;
456+ } else {
457+ backspaceNum--;
458+ }
459+ startIndex--;
460+ }
461+ return startIndex;
462+ }
463+ ```
464+ 465+ 466+ 402467
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404469<div align =" center " ><img src =https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width =500 > </img ></div >
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