C++ :

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,a[110],i;
    cin>>n;
    for(i = 1;i <= n;i++){
    	cin>>a[i];
	}
	
	int c1 = 0;
	int c2 = 0;
	
	for(i = 1;i < n;i++){
		if(a[i] == 10) c1++;
		else c2++;
	}
	
	if(c1 > c2){
		cout<<10;
	}else{
		cout<<20;
	}
    return 0;
}

Java :

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num1 = scanner.nextInt();
//        int num2 = scanner.nextInt();
        int[] a = new int[num1];
        int count1 = 0,count2 = 0, count3 = 0;
        for (int i = 0; i < num1; i++) {
            a[i] = scanner.nextInt();
        }
        for (int i = 0; i < num1; i++) {
            if(a[i] == 10)count1++;
            else if(a[i] == 20) count2++;
        }
        if(count1 > count2)
        System.out.println(10);
        else System.out.println(20);

    }

    public static boolean judge(int i,int j){
        int a,s = 0;
        while(i != 0){
            a = i % 10;
            s = s + a;
            i /= 10;
        }
        if(s == j)return true;
        else return false;
    }

    public static void paiXu(int[] a){
        int temp;
        for(int i = 0;i < a.length - 1;i++){
            for(int k = 0;k < a.length - i - 1;k++){
                if(a[k] > a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    }
}

Python :

n=int(input())
s1=list(map(int,input().split()))
a10=len([item for item in s1 if item==10])
a20=len([item for item in s1 if item==20])
if a10>a20:
    print("10")
else:
    print("20")