杭电ACM HDU 1014

#include <cstdio>
int main(){
    int step,mod;
    int m[100001];
    while(~scanf("%d%d",&step,&mod)){
        m[0]=0;
        int i;
        for(i=0;i<mod;i++){
            m[i+1]=(m[i]+step)%mod;
            if(m[i+1]==0)break;
        }
        printf("%10d%10d    ",step,mod);
        if(i==mod-1)printf("Good Choice\n\n");
        else printf("Bad Choice\n\n");
    }
}