题解 | #提取不重复的整数#

#include <math.h>
#include <stdio.h>

int main() {
    int input;

    scanf("%d", &input);

    int mark = 0;
    int count = 0;
    int output = 0;
    int remainder;

    while(input)
    {
        remainder = input % 10;
        if (!(mark & (1 << remainder)))
        {
            mark += (1 << remainder);
            output = output * 10 + remainder;
            count++;
        }

        input /= 10;
    }


    printf("%d", output);
}