题解 | #删除字符串中出现次数最少的字符#

#include <stdio.h>
#include <string.h>
void deletechar(char* s, char x) {

    int i = 0;
    int j = 0;
    while (s[i] != '\0') {
        if (s[i] != x) {
            s[j] = s[i];
            j++;
        }
        i++;
    }
    s[j] = '\0';
}
void count(char* s, int* y) {

    int l = strlen(s);
    int i;
    int a;
    for (i = 0; i < l; i++) {
        a = s[i];
        y[a]++;
    }
}
int main() {
    char s[21];
    gets(s);
    int y[130];
    memset(y, 0, sizeof(y));
    count(s, y);
    int i;
    int low = 20;
    for (i = 97; i < 123; i++) {
        if (y[i] != 0 && y[i] < low)
            low = y[i];
    }
    i = 0;
    while (i < strlen(s)) {
        int j = s[i];
        if (y[j] == low)
            deletechar(s, s[i]);
        else
            i++;
    }
    printf("%s\n", s);
    return 0;
}