HackerRank - Minimum Cost - study code - C++ using Set -

MinimumCost_studycode_Set.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>

#include <set>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin >> n;
    set < long long int > S;
    long long int t = 5e18;
    while(n--)
    {
        
        long long int x;
        cin >> x;
        if(S.upper_bound(x) != S.end())
            t = min(t, *S.upper_bound(x) - x);
        
        S.insert(x);
    }
    cout << t << "\n";
    return 0;
}