题解 | #字符统计#

#include <stdio.h>
#include <string.h>

int main() {

    int arr[124] = {'\0'};
    char buf[1001] = {'\0'};

    scanf("%s", buf);
    int len = strlen(buf);

    for (int i = 0; i < len; i++) {
        arr[buf[i]]++;
    }

    int max = 0;
    int mark[124] = {0};
    for (int j = 0; j < 124; j++) {
        for (int i = 0; i < 124; i++) {
            if (arr[i] > max) {
                max = arr[i];
                mark[j] = i;
            }
        }
        max = 0;
        arr[mark[j]] = 0;
    }
    
    for (int i = 0; i < len; i++) {
        if(mark[i] == 0){              //之前没有这个if判断会出错，榜一给了提示
            break;
        }
        printf("%c", (char)mark[i]);
    }

    return 0;
}