啊这，如果是比赛的话，肯定就用 sort 函数了。写个 cmp 就随便打。

#include <iostream>
#include <algorithm>

using namespace std;

struct node2 {
	string name;// 姓名
	int score;// 乘积
};

bool cmp(node2 a, node2 b) {
	return a.score > b.score;
}


int main(void) {
	int N;
	cin >> N;

	node2* arr = new node2[N];

	for (int i = 0; i < N; ++i) {
		string name;
		int score;
		cin >> arr[i].name >> arr[i].score;
	}

	sort(arr,arr+N,cmp);
	
	for (int i = 0; i < N; ++i) {
		string str = "";
		int score = arr[i].score;
		if (score == 0) {
			str = "Bad";
		}else if (score >= 1 && score < 200) {
			str = "Not good";
		}else if (score >= 200 && score < 300) {
			str = "Bronze medal";
		}else if (score >= 300 && score < 400) {
			str = "Silver medal";
		}else if (score >= 400) {
			str = "Gold medal";
		}

		cout << arr[i].name << " " << arr[i].score << " " << str << endl;
	}


	return 0;
}