longest substring without repeating character leetcode c++
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this problem broaden its test set,so that we should use sign[xxxx]-'a' two record;
and when we calculate the length, we should test j-i+1;
class Solution {public: int lengthOfLongestSubstring(string s) { int sign[300]={0}; int i = 0; int j = 0; int max = 0; for(i = 0,j = 0;j<s.length();j++) { while(sign[s[j]-' '] == 1) { sign[s[i]-' '] = 0; i++; } sign[s[j]-' '] = 1; if(j-i +1> max) max = j-i+1; } return max; }};
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