Kattis Problem Solution to Freefood in c++

#include<bits/stdc++.h>
using namespace std;
int main(int argc, char const *argv[])
{
int t;
cin >> t;
set<int> day;
while(t--){
int a,b;
cin >> a >> b;
for (int i = a; i <= b; i++)
{
day.insert(i);
}
}
cout << day.size() << "\n";
return 0;
}

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