1790. 仅执行一次字符串交换能否使两个字符串相等

  1. class Solution {
  2.     public boolean areAlmostEqual(String s1, String s2) {
  3.         if (s1.length() != s2.length())
  4.             return false;
  6.         int len = s1.length();
  7.         int count = 0;
  8.         char c1 = 'a';
  9.         char c2 = 'a';
  11.         for (int i = 0; i < len; i++) {
  12.             if (s1.charAt(i) == s2.charAt(i)) {
  13.                 continue;
  14.             } 
  16.             if (count == 0) {
  17.                 c1 = s1.charAt(i);
  18.                 c2 = s2.charAt(i);
  19.             } else if (count == 1) {
  20.                 if (s1.charAt(i) != c2 || s2.charAt(i) != c1) {
  21.                     return false;
  22.                 }
  23.             } else {
  24.                 return false;
  25.             }
  27.             ++count;
  28.         }
  30.         return count != 1;
  31.     }
  32. }