已AC，请放心食用

#include <iostream>
using namespace std;
int main()
{
    int n, a[10], sum1 = 0, sum2 = 0;
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
        if (a[i] == 10)
        {
            sum1++;
        }
        else
        {
            sum2++;
        }
    }
    if (sum1 > sum2)
    {
        cout << "10";
    }
    else
    {
        cout << "20";
    }
    return 0;
}

呵呵，本题的AC我笑纳了

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,x,ans1=0,ans2=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>x;
        if(x==10) ans1++;
        else ans2++;
    }
    cout<<((ans1>ans2)?"10":"20");
    return 0;
}

#include <iostream>
using namespace std;
int main()
{
    int n,x,a=0,b=0;
    cin >> n;
    for(int i=1;i<=n;i++)
    {
        cin >> x;
        if(x==10)
        {
            a++;
        }
        else
        {
            b++;
        }
    }
    if(a>b)
    {
        cout << 10;
    }
    else
    {
        cout << 20;
    }
}