Would appreciate some help, it keeps on giving me WA on tasks 1, 4, 5, 6, 12 and 13.

Sure, you guys have posted awesome answers, but I really need to find out what's wrong with my code.

#include <iostream>
#include <fstream>
#include <cstdio>
#include <algorithm>
#include <climits>
using namespace std;
int main()
{
  ios_base::sync_with_stdio(false);
  
  typedef long int li;
  li n, x, y, i, start_key, end_key, up, low, mid, start, end, result;
  bool flag = false;
  cin>>n>>x>>y;
 
  li contest[n][2];
  li warmholeV[x];