The game of Osho Gym - 101147A

 https://cn.vjudge.net/problem/Gym-101147A

SG函數：

首先定義mex(minimal excludant)運算，這是施加於一個集合的運算，表示最小的不屬於這個集合的非負整數。例如mex{0,1,2,4}=3、mex{2,3,5}=0、mex{}=0。

SG 定理：遊戲的和的 SG 值是各個子游戲的 SG 值的 xor。

 <tr1/unordered_map>
#include <unordered_map>
#include <cmath>
//#include<bits/stdc++.h>
using namespace std;

#define sfi(i) scanf("%d",&i)
#define sfl(i) scanf("%lld",&i)
#define sfs(i) scanf("%s",(i))
#define pri(i) printf("%d\n",i)
#define prl(i) printf("%I64d\n",i)
#define sff(i) scanf("%lf",&i)
#define ll long long
#define ull unsigned long long
#define uint unsigned int
#define mem(x,y) memset(x,y,sizeof(x))
#define INF 0x3f3f3f3f
#define inf 1e18
#define eps 1e-10
#define PI acos(-1.0)
#define lowbit(x) ((x)&(-x))
#define fl() printf("flag\n")
#define MOD(x) ((x%mod)+mod)%mod
#define endl '\n'
#define pb push_back
#define lson (rt<<1)
#define rson (rt<<1|1)
#define FAST_IO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)

template<typename T>inline void read(T &x)
{
    x=0;
    static int p;p=1;
    static char c;c=getchar();
    while(!isdigit(c)){if(c=='-')p=-1;c=getchar();}
    while(isdigit(c)) {x=(x<<1)+(x<<3)+(c-48);c=getchar();}
    x*=p;
}

//-----------------------------------------------
const int maxn=5e5+9;
const int mod=1e9+7;



int main()
{
    //FAST_IO;

    //freopen("input.txt","r",stdin);
    freopen("powers.in","r",stdin);

    int T;
    cin>>T;
    while(T--)
    {
        int g;
        cin>>g;
        int ans=0;
        for(int i=1;i<=g;i++)
        {
            int b,n;
            cin>>b>>n;
            if(b&1)
            {
                if(n&1) ans^=1;
                else ans^=0;
            }
            else
            {
                int yu=n%(b+1);
                if(yu==b)
                {
                    ans^=2;//sg 可以0||1
                }
                else
                {
                    if(yu&1) ans^=1;
                    else ans^=0;
                }

            }
        }
        if(ans) cout<<1<<endl;
        else cout<<2<<endl;
    }


    return 0;
}