1016 部分A+B

#include<stdio.h>
int pow(int i) {
    int j, k=1;
    for (j = 0; j <i; j++) {
        k *= 10;
    }
    return k;
}
int main(void) {
    int da, na,db, nb, m;
    long int a, b;
    na = nb = 0;
    m = -1;
    scanf("%ld %d %ld %d", &a, &da, &b, &db);
    while (a != 0) {
        if (a % 10 == da) {
            m++;
            na+=pow(m)*da;
        }
        a/=10;
    }
    m = -1;
    while (b != 0) {
        if (b % 10 == db) {
            m++;
            nb+=pow(m)*db;
        }
        b/=10;
    }
    
    printf("%d", na + nb);
    return 0;
}