牛客网PAT德才论 sort函数触发中断

求助大佬。编程小白在做牛客网PAT德才论问题时调用sort函数时触发了中断。当输入数据样本是4个时程序可以正常运行，但是数据样本多了就会在sort函数那里触发中断，实在是找不到代码哪里存在问题，请大佬帮忙看一下。

#include"stdafx.h"
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

struct dcl
{
    long x;
    int y;
    int z;
    int sum = y + z;

};
bool cmp(const dcl&a, const dcl&b)
{
    if (a.sum > b.sum)
    {
        return a.sum > b.sum;
    }
    else if (a.sum == b.sum)
    {
        return a.y > b.y;
    }
    else if (a.y == b.y)
    {
        return a.x < b.x;
    }
    else
    {
        return false;
    }

}
int main()
{
    int n , l , h,count=0;
    cin >> n>>l>>h;
    vector<dcl> a;
    for (int i = 0; i < n; i++)
    {
        dcl b;
        cin >> b.x >> b.y >> b.z;
        if (b.y >= l&&b.z >= l)
        {
            a.push_back(b);
            count++;
        }
    }
    vector<dcl>one;
    vector<dcl>two;
    vector<dcl>three;
    vector<dcl>four;
    for (int i = 0; i < count; i++)
    {
        if (a[i].y >= h&&a[i].z >= h)
        {
            one.push_back(a[i]);
        }
        else if (a[i].y >= h&&a[i].z < h)
        {
            two.push_back(a[i]);
        }
        else if (a[i].y < h&&a[i].z < h&&a[i].y >= a[i].z)
        {
            three.push_back(a[i]);
        }
        else
        {
            four.push_back(a[i]);
        }
    }

    sort(one.begin(), one.end(), cmp);
    sort(two.begin(), two.end(), cmp);
    sort(three.begin(), three.end(), cmp);
    sort(four.begin(), four.end(), cmp);
    cout << count << endl;  
    for (int i = 0; i < one.size(); i++)
    {
        cout << one[i].x << " " << one[i].y << " " << one[i].z << endl;
    }
    for (int i = 0; i < two.size(); i++)
    {
        cout << two[i].x << " " << two[i].y << " " << two[i].z << endl;
    }
    for (int i = 0; i < three.size(); i++)
    {
        cout << three[i].x << " " << three[i].y << " " << three[i].z << endl;
    }
    for (int i = 0; i < four.size(); i++)
    {
        cout << four[i].x << " " << four[i].y << " " << four[i].z << endl;
    }
    system("pause");
    return 0;
}