389_Find_the_Difference_Easy.c

/*
 Given two strings s and t which consist of only lowercase letters.

String t is generated by random shuffling string s and then add one more letter at a random position.

Find the letter that was added in t.

Example:

Input:
s = "abcd"
t = "abcde"

Output:
e

Explanation:
'e' is the letter that was added.

*/

char findTheDifference(char* s, char* t) {
    int i,j;
    char add;
    int n = strlen(t);
    for(i = 0; i <= n-1; i++)//将相同的数都置换为1，避免遇到数组中有多个相同字母，这样可以一一对应，筛掉相同的，留下不同的
        for(j=0;j<= n-2;j++)
            if(t[i]==s[j])
            {
                t[i] = 49;
                s[j] = 49;
                break;
            }
    for(i=0;i<n;i++)//找出没有被替换的数，即多出来的数
        if(t[i]!=49)
            return t[i];
    return;
}