Why WA?

#include <iostream>
using namespace std;
void main(){
    int x;
    int y;
    int jb = 0, jc = 0;
        cin >> x;
        //int mass[x];
        int *mass = new int[x];
        int *mass2 = new int[x];
        int *mass3 = new int[x];

        for(int i=0;i<x;i++){
            cin >> y;
            mass[i] = y;
        }

        for(int i=0, j=0, p=0;i<x;i++, j=0, p=0){
            if(mass[i] == 0){
                continue;
            }
            for(;j<x;j++){
                if(mass[j] == 0){
                continue;
            }
                if(mass[i]==mass[j]){
                    p++;
                    if(i!=j){
                    mass[j]=0;
                    }
                }
            }
            mass2[i] = p;
            mass3[i] = mass[i];
            if(jb<=mass2[i]){
                jb=mass2[i];
                jc=i;
            }
        }
        cout << mass3[jc];
}

AND JAVA How make this program faster?
import java.util.*;

public class Uno {
    public static void main(String[] args){
        int jb = 0, jc = 0;
        Scanner in = new Scanner(System.in);
        int x = in.nextInt();
        int[] mass = new int[x];
        int[] mass2 = new int[x];
        int[] mass3 = new int[x];

        for(int i=0;i<mass.length;i++){
            int y = in.nextInt();
            mass[i] = y;
        }

        for(int i=0, j=0, p=0;i<mass.length;i++, j=0, p=0){
            if(mass[i] == 0){
                continue;
            }
            for(;j<mass.length;j++){
                if(mass[j] == 0){
                    continue;
                }
                if(mass[i]==mass[j]){
                    p++;
                    if(i!=j){
                    mass[j]=0;
                    }
                }
            }
            mass2[i] = p;
            mass3[i] = mass[i];
            if(jb<=mass2[i]){
                jb=mass2[i];
                jc=i;
            }
        }
        System.out.print(mass3[jc]);
    }
}

OR C#
using System;

public class Uno
{
    public static void Main(String[] args)
    {
        string x; string y;
        int jb = 0, jc = 0;
        x = Console.ReadLine();
        int[] mass = new int[int.Parse(x)];
        int[] mass2 = new int[int.Parse(x)];
        int[] mass3 = new int[int.Parse(x)];

        for (int i = 0; i < int.Parse(x); i++)
        {
            y = Console.ReadLine();
            mass[i] = int.Parse(y);
        }

        for (int i = 0, j = 0, p = 0; i < int.Parse(x); i++, j = 0, p = 0)
        {
            if (mass[i] == 0)
            {
                continue;
            }
            for (; j < int.Parse(x); j++)
            {
                if (mass[j] == 0)
                {
                    continue;
                }
                if (mass[i] == mass[j])
                {
                    p++;
                    if (i != j)
                    {
                        mass[j] = 0;
                    }
                }
            }
            mass2[i] = p;
            mass3[i] = mass[i];
            if (jb <= mass2[i])
            {
                jb = mass2[i];
                jc = i;
            }
        }
        Console.Write(mass3[jc]);
    }
}