The sorting of C++ vector structure causes the program to interrupt unexpectedly

Let me talk about the reason first: 自定义的比较函数不能带等号，只能小于或大于
a class is defined as follows:

class Flow {
    
    
	public:
		int id;
		int bandwidth;
		int arrTime;
		int startTime;
		int needTime;
		Flow(int i, int b, int a, int n);
};

A comparison function is defined as follows:

bool sortFlowsByArrtime(Flow x, Flow y) {
    
    
	return x.arrTime <= y.arrTime;
}

Then output after sorting:

sort(flows.begin(),flows.end(),sortFlowsByArrtime);
for (auto var : flows) {
    
    
	cout << var.id << " " << var.bandwidth << " " << var.arrTime << " " << var.needTime << endl;
}

It breaks unexpectedly at sortthis line every time.
Change return x.arrTime <= y.arrTime;it to return x.arrTime < y.arrTime;, and it will be resolved.
Reference link: https://www.coder.work/article/2746620