UVA 1482 SG打表

打出SG表来可以很容易的发现i为偶数时 SG[i]=i/2 i为奇数时 SG[i]=SG[i/2]

#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
ll SG(ll x) {
    return x&1?SG(x/2):x/2;
}
 
int main() {
    int t;
    scanf("%d", &t);
    while (t--) {
        int n;
        ll a, v = 0;
        scanf("%d", &n);
        for (int i = 0; i < n; i++) {
            scanf("%lld", &a);    
            v ^= SG(a);
        }
        if (v)
            printf("YES\n");
        else printf("NO\n");
    }
    return 0;
}