题解 | #提取不重复的整数#

#include <stdio.h>

int main(void) {
    int checkArray[500] = {0};
    char* string = (char*)malloc(sizeof(char) * 5000);
    gets(string);
    int len = strlen(string);
    for (int i = len - 1; i >= 0; i--) {
        int number = string[i] - '0';
        if (checkArray[number] == 0) {
            printf("%d", number);
            checkArray[number] = 1;
        }
    }
    free(string);
    return 0;
}