输入样例：

2
1
2
2
1 1

一下这个死循环了

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

const int N = 110;
int T, n, a[N];
bool vis[N];

bool check() {
    int sum;
    for(int i = 1; i <= n; i++) sum += vis[i];
    return (sum != n);
}

int main() {

    cin >> T;
    while(T--) {
        memset(vis, 0, sizeof vis);
        vis[0] = true;
        cin >> n;
        for(int i = 1; i <= n; i++)
            cin >> a[i];
        sort(a + 1, a + n + 1);
        int sum[2], old = 0;
        bool book = 0;
        while(check()) {
            for(int i = 1; i <= n; i++)
				if(!vis[i]) {
                    sum[book]++;
                    book ^= 1;
                    swap(vis[i], vis[old]);
                    if(!a[old]) vis[old] = true;
                    a[i]--;
                    old = i;
                    break;
                }
        }
        cout << (book ? "T" : "HL") << endl;
    }

    return 0;
}

然后加了个 cout << "";，竟然不死循环了！

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

const int N = 110;
int T, n, a[N];
bool vis[N];

bool check() {
    int sum;
    for(int i = 1; i <= n; i++) sum += vis[i];
    return (sum != n);
}

int main() {

    cin >> T;
    while(T--) {
        memset(vis, 0, sizeof vis);
        vis[0] = true;
        cin >> n;
        for(int i = 1; i <= n; i++)
            cin >> a[i];
        sort(a + 1, a + n + 1);
        int sum[2], old = 0;
        bool book = 0;
        while(check()) {
            for(int i = 1; i <= n; i++)
				if(!vis[i]) {
                    sum[book]++;
                    book ^= 1;
                    swap(vis[i], vis[old]);
                    if(!a[old]) vis[old] = true;
                    a[i]--;
                    old = i;
                    cout << "";
                    break;
                }
        }
        cout << (book ? "T" : "HL") << endl;
    }

    return 0;
}