Codeforces 1383B GameGame（博弈）

题意：长度为n的数组a，Va=Vb=0，先手选出一个a【i】xor Va，后手同理，,Va>Vb为胜利，给出a【】问必胜，必败还是平局。

题解：https://codeforces.com/blog/entry/80562

#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(false);cin.tie(0)
#define fre freopen("C:\in.txt", "r", stdin)
#define _for(i,a,b) for(int i=a; i< b; i++)
#define _rep(i,a,b) for(int i=a; i<=b; i++)
#define lowbit(a) ((a)&-(a))
#define inf 0x3f3f3f3f
#define endl "
"

using namespace std;
typedef long long ll;
template <class T>
void read(T &x)
{
    char c; bool op=0;
    while(c=getchar(), c<'0'||c>'9') if(c=='-') op=1;
    x=c-'0';
    while(c=getchar(), c>='0'&&c<='9') x=x*10+c-'0';
    if(op) x=-x;
}

const int maxn=1e5+5;
int T, n, a[maxn];

int main()
{
    //fre;
    read(T);
    while(T--)
    {
        read(n);
        int x=0, k=30;
        _rep(i, 1, n) read(a[i]), x^=a[i];
        if(!x){
            printf("DRAW
"); continue;
        }
        while(!(x>>k&1)) k--;
        //printf("k=%d
", k);
        vector<int> f(2);
        _rep(i, 1, n) f[a[i]>>k&1]++;
        if(f[1]%4==3 && f[0]%2==0) printf("LOSE
");
        else printf("WIN
");
    }
    return 0;
}