结构体

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

struct abc{
	string name;
	string password;
	string email;
}a[100005];

int main()
{
	string u_email;
	int n;
	cin >> u_email >> n;
	for(int i = 1; i <= n; i++)
		cin >> a[i].name >> a[i].password >> a[i].email;
	bool temp = false; //是否有一致，如果标记为true说明 有输出，否则为false输出空
	for(int i = 1; i <= n; i++)
	{
		if(a[i].email == u_email)//验证邮箱是否相同
		{
			for(int j = 0; j < a[i].password.length(); j++)
			{
				if(a[i].password[j] >= 'a' && a[i].password[j] <= 'z')
					a[i].password[j] -= 32;
				else if(a[i].password[j] >= 'A' && a[i].password[j] <= 'Z')
					a[i].password[j] += 32;
			}
			cout << a[i].name <<" "<< a[i].password << endl;
			temp = true;
		}
	}
	if(!temp) cout << "empty" << endl;
}