題目

Given a string, find the length of the longest substring without repeating characters.

Examples:

Given "abcabcbb", the answer is "abc", which the length is 3.

Given "bbbbb", the answer is "b", with the length of 1.

Given "pwwkew", the answer is "wke", with the length of 3. Note that the answer must be a substring, "pwke" is a subsequence and not a substring.

作答

js

/**
 * @param {string} s
 * @return {number}
 */
var lengthOfLongestSubstring = function(s) {
      var resultStr="",maxLength = 0 ,currentCount = 0;
        for(var i = 0 ;i<s.length ;i++){
             for(var j = i ;j < s.length; j++){
                      if(resultStr.indexOf(s[j])===-1){
                            currentCount++;
                            resultStr +=s[j]
                            maxLength = currentCount > maxLength ? currentCount : maxLength
                      }else{
                        //記錄當(dāng)前長(zhǎng)度
                          maxLength = currentCount > maxLength ? currentCount : maxLength
                          //重置
                          resultStr = "";
                          currentCount = 0 ;
                          //跳出當(dāng)前位置繼續(xù)尋找
                          break;
                      }
             }
        }
        return maxLength
};