zoj2507 Let's play a game

Let's play a game Time Limit: 2 Seconds Memory Limit: 65536 KB

Elves from the Lothvain forest have created a very interesting game. The rules are very simple:

• There are two players.

• In the beginning there are n groups of stones. The i-th group contains a_i stones.

• A player has to take a positive number of stones from exactly one of the groups in his turn.

• A player who can't make a move (each group is empty) wins.

Very soon they have learnt how to always make the best possible move. Your task is to write a program that computes which of the players has a winning strategy for a given situation.

INPUT

The first number appearing in the input is number of datasets t (5<=t<=50). Each dataset is given in following format. The first row contains a single number n (1<=n<=10000). The next row contains exactly n numbers: a_1, a_2,..., a_n (0<=a_i<=1000000000). There are no empty lines between the datasets. You may assume that at least one group of stones is not empty.

OUTPUT

For each of datasets your program should write:

• 1 if the first player has a winning strategy

• 2 otherwise

in a separate row.

SAMPLE

INPUT  2 3 1 1 1 5 1 0 1 1 1 OUTPUT 2 1 

antisg!

#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;

int main()
{
    int tcase,n,pri;
    scanf("%d",&tcase);
    while(tcase--){
        scanf("%d",&n);
        int k=0,ans=0;
        for(int i=0;i<n;i++){
            scanf("%d",&pri);
            ans^=pri;
            if(pri>1)k++;
        }
        if(ans){
            if(k)printf("1\n");
            else printf("2\n");
        }
        else {
            if(k)printf("2\n");
            else printf("1\n");
        }
    }
    return 0;
}