LeetCode 387：first-unique-character-in-a-string

题目：https://leetcode.com/problems/first-unique-character-in-a-string/

难度：Easy

int firstUniqChar(char* s) {
    int a[26][2]={0};
    for(int i=0;i<strlen(s);i++){
        a[s[i]-'a'][0]++;
        a[s[i]-'a'][1]=i;
    }
    int res= 100000;
    for(int i=0;i<26;i++){
        if(a[i][0]==1 && a[i][1]<res){
            res=a[i][1];
        }
    }
    if(res == 100000)return -1;
    return res;
}