Thanks :D

What's your opinion about Competitive Programming 3

And what make Competitive programmer handbook in the best ?

because Qualification of IOI in April and I will try hard to finish one book with Practice

Are you mean Competitive Programmer's handbook ?

Why it's Wrong Answer

#include <iostream>
 
using namespace std;
 
int main()
{
    long long n , h , x , ind = 1;
    bool t = false ;
    cin>>n>>h ;
    long long arr[100001];
    for(long long i = 1 ; i <= n ; ++i)
    {
        cin>>x ;
        arr[i] = x ;
    }
    while(cin>>x)
    {
      if(x == 0)
         break ;
      if(x == 1)
      {
          ind-- ;

It's my solution The website told me Fatal

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll ;
 
int main()
{
    ll n , x , y , z = -1;
    cin>>n ;
    ll arr[n+1] , arr1[n+1] , arr2[n+1];
    for(ll i = 1 ; i <= n ; ++i)
    {
        cin>>x>>y ;
        z = max(z , abs(x - y));
        if(x >= y)
            arr1[i] = 1 ;
        else
            arr1[i] = 2 ;
        arr[i] = x ;
        arr2[i] = y ;
    }