So i have almost similar approach to the editorial, where i chose the smallest feasible day for every exam and update my answer. Though i am getting RUNTIME_ERROR in test case 18.

Things i checked for: - proper data types used - dry ran my code on paper on many cases - searched for meaning of exit code -1073741819, but to no avail. still get the error.

The compiler does not show the full test case and stops in between so cannot give u the test case. But it is numbered 18 with very large values.

Here is my code:

#include<bits/stdc++.h>
using namespace std;
bool compare(pair<long long,long long> &a,pair<long long,long long> &b)
{
	if(a.first<=b.first)
		return true;
	return false;
}
int main()
{
	int n;
	cin>>n;
	pair<long long,long long> A[n];
	long long day=0;
	for(int i=0;i<n;i++)
	{
		long long a,b;
		cin>>a>>b;
		A[i]={a,b};
	}
	sort(A,A+n,compare);
	for(int i=0;i<n;i++)
	{
		long long temp=LLONG_MAX;
		if(day<=A[i].first)
			temp=A[i].first;
		if(day<=A[i].second && temp>A[i].second)
			temp=A[i].second;
		if(temp!=LLONG_MAX)	
			day=temp;	
	}
	cout<<day;				
	return 0;
}