Poj3370Halloween treats鸽巢原理

#include<iostream>
#include<cstdio>
#include<cstring>
#include<map>
#include<vector>
#include<stdlib.h>
using namespace std;
const int maxn = 111111;
int a[maxn]; int b[maxn];
int vis[maxn];
int main()
{
    int n, mod;
    while (scanf("%d%d", &mod, &n), n || mod){
        for (int i = 1; i <= n; i++){
            scanf("%d", &a[i]); b[i] = a[i];
        }
        for (int i = 1; i <= n; i++)
            b[i] += b[i - 1], b[i] %= mod;
        int gg = 0;
        for (int i = 1; i <= n; i++){
            if (b[i] == 0){
                for (int j = 1; j <= i; j++)
                    printf("%d ", j); cout << endl;
                gg = 1;
                break;
            }
        }
        if (gg)continue;
        memset(vis, 0, sizeof(vis));
        for (int i = 1; i <= n; i++){
            if (!vis[b[i]]){
                vis[b[i]] = i;
            }
            else{
                for (int j = vis[b[i]] + 1; j <= i; j++)
                    printf("%d ", j);
                cout << endl;
                gg = 1; break;
            }
        }
        if (!gg) puts("no sweets");
    }
    return 0;
}