Problem
Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1.
Note: You may assume the string contain only lowercase letters.
Example
s = "leetcode"
return 0.
s = "loveleetcode",
return 2.
Code
static int var = [](){
std::ios::sync_with_stdio(false);
cin.tie(NULL);
return 0;
}();
class Solution {
public:
int firstUniqChar(string s) {
long table[256] = {0};
for(int i=0;i<s.size();i++){
table[s[i]]++;
}
for(int i=0;i<s.size();i++){
if(table[s[i]]==1)
return i;
}
return -1;
}
};
Result
387. First Unique Character in a String.png
