#include <bits/stdc++.h>
using namespace std;
const int MAXN=1001;
struct ticket 
{
       int price,time,used;
}q[MAXN];
int head, tail, n, cost;
int main()
{
    cin>>n;
    for (int i=0;i<n;i++) 
	{
        int kind,price,time;
        cin>>kind>>price>>time;
        if (kind==0) 
		{
            cost+=price;
            q[tail].time=time+45;
            q[tail++].price=price;
        } 
		else 
		{
            while (head<tail&&q[head].time<time)
			{
                   head++;
            }
            bool found=false;
            for (int j=head;j<tail;j++)
			{
                if (q[j].price>=price&&q[j].used==0) 
				{
                    found=true;
                    q[j].used=1;
                    break;
                }
            }
            if (!found) 
			   cost+=price;
        }
    }
    cout<<cost<<endl;
    return 0;
}

本题只得了30分，错误部分显示：Runtime Error. Received signal 11: Segmentation fault with invalid memory reference.不知道是哪里出了问题。麻烦指出错误，并给出正确改正方案。谢谢！