#coding:utf-8

代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可

@param s string字符串

@return int整型

class Solution: def lengthOfLongestSubstring(self , s): # write code here ret = 0 curLen = 0 dist = dict()

    for idx in range(len(s)):
        lastDist = dist.get(s[idx], -1)
        dist[s[idx]] = idx
        if lastDist == -1:
            curLen += 1
        elif curLen >= (idx-lastDist):
            curLen = idx-lastDist
        elif curLen < idx-lastDist:
            curLen += 1

print(idx, curLen, lastDist)

        ret = max(ret, curLen)
    return ret