Can someone tell what is wrong with my code ?

Here is my code :-

#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<limits.h>
using namespace std;
bool maps[501][100001];
int main(){
	int ans = 0;
	for(int i=0;i<501;++i){
		for(int j=0;j<100001;++j){
			maps[i][j] = true;
		}
	}
	int n;
	scanf("%d" , &n);
	for(int i=0;i<n;++i){
		int x , y;
		scanf("%d%d" , &x , &y);
		maps[y][x] = false;
	}

Hussain , Thanks for your help. Got AC :D .

Here is a short 4 min video from GeeksforGeeks :-

Now a question to solve :-

WSITE01

Getting SEG in test case 0 , 8 , 9.

Here is my code :-

#include <bits/stdc++.h>
using namespace std;
 
class edge{
	public:
	int st , en , cst;
};
bool cmp(edge a , edge b){
	return a.cst < b.cst;
}
int find(int parent[], int i){
	if(parent[i] == -1)
		return i;
	find(parent , parent[i]);	
}
void Union(int parent[] , int x , int y){
	int xs = find(parent , x);
	int ys = find(parent , y);
	parent[xs] = ys;
}

Why is Eclipse or IntelliJ not available for JAVA but Dev C++ or Code Blocks are available for C++ during the ZCO exam ?

Hussain , Thanks for helping me . I got AC after simplifying the first part of my code by the suggested method . I too believe that I had complicated it unnecessarily.

Getting WA in some of the testcases :-

#include<stdio.h>
#include<iostream>
#include<cmath>
#include<limits.h>
using namespace std;
 
bool map[500][500];
int val[500][500];
int main()
{
	int N , P;
	scanf("%d %d" , &N , &P);
	for(int i=0;i<N;++i){
		for(int j=0;j<N;++j){
			cin >> val[i][j];
			map[i][j] = false;
		}
	}
	while(P>0){
		--P;
		int x , y , k;
		scanf("%d %d %d" , &y , &x , &k);

Hussain , Thank you for trying to debug my code. I think there is a problem with some of their test cases.

Getting WA in the last test case

/**
 * Created by Onkar Nandedkar on 23-05-2017.
 */
 
import java.io.*;
import java.util.*;
 
public class Main {
 
    static class Reader
    {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;
 
        public Reader()
        {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];

Solution with Faster I/O in JAVA :-

import java.io.*;
 
public class Main {
 
    static class Reader
    {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;
 
        public Reader()
        {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }
 
        public Reader(String file_name) throws IOException
        {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];