50198. Two Digits

#include <stdio.h>
#include <stdlib.h>
 
int con_2_dig(int x){
    int cnt[10] = {0};
    while(x){
        cnt[x % 10]++;
        x /= 10;
    }
 
    int cnt_not_0 = 0;
    for(int i = 0; i < 10; i++) if(cnt[i] != 0) cnt_not_0++;
    return cnt_not_0 <= 2;
}
 
void solve(int a, int b, int x){
    while(!con_2_dig(x)){
        x = (a * x) % b;
    }
    printf("%d\n", x);
}
 
int main(){
    int a, b, x;
    while(scanf("%d %d %d", &a, &b, &x) != EOF){
        solve(a, b, x);
    }
}