一、视频讲解

蓝桥杯真题讲解：三国游戏（贪心）

二、正解代码

//三国游戏：贪心
#include<bits/stdc++.h>
#define int long long
#define endl '\n'
#define deb(x) cout << #x << " = " << x << '\n';
#define INF 0x3f3f3f3f
using namespace std;
int n;

int cal_ans(vector<int>&a, vector<int>&b, vector<int>&c)
{
	vector<int>tmp(n);
	int sum = 0;

	for(int i = 0; i < n; i ++)
		tmp[i] = a[i] - (b[i] + c[i]);

	sort(tmp.begin(), tmp.end());

	int cnt = 0;
	for(int i = n - 1; i >= 0; i --)
	{
		if(sum + tmp[i] > 0)
		{
			sum += tmp[i];
			cnt ++;
		}
		else
			break;
	}
	return cnt;
}

void solve()
{
	cin >> n;
	vector<int>a(n), b(n), c(n);
	for(int i = 0; i < n; i ++)
		cin >> a[i];

	for(int i = 0; i < n; i ++)
		cin >> b[i];

	for(int i = 0; i < n; i ++)
		cin >> c[i];

	int ans = 0;
	ans = cal_ans(a, b, c);//x赢


	ans = max(ans, cal_ans(b, a, c));//y赢

	ans = max(ans, cal_ans(c, a, b));//z赢
	
	if(ans)
		cout << ans << endl;
	else
		cout << -1 << endl;
}

signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int t;
	t = 1;
	//cin >> t;
	while(t--)
	solve();
}