Go: package main

import (
        "fmt"
        "bufio"
        "os"
        "strconv"
)

func main() {
        fp := os.Stdin
        scanner := bufio.NewScanner(fp)
        var lst [3]int

        for scanner.Scan() {
                num, _ := strconv.Atoi(scanner.Text())
                if lst[0] < num {
                        lst[2] = lst[1]
                        lst[1] = lst[0]
                        lst[0] = num
                } else if lst[1] < num {
                        lst[2] = lst[1]
                        lst[1] = num
                } else if lst[2] < num {
                        lst[2] = num
                }
        }

        for _, i := range lst {
                fmt.Printf("%d\n", i)
        }
}

C++: #include <cstdio>
#include <iostream>
#include <cmath>
#include <ctype.h>
#include <string> 
#include <sstream>
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <map>
#include <queue>
#include <utility>
#include <vector>
#include <set>
#include <list>
#include <cstring>
#include <stack>
   
using namespace std;

int main()
{
    vector<int> mountain;
    for(int i = 0; i < 10; i++){
        int tmp;
        cin >> tmp;
        mountain.push_back(tmp);
    }
    sort(mountain.begin(), mountain.end());
    reverse(mountain.begin(), mountain.end());
    for(int i = 0; i < 3; i++){
        cout << mountain[i] << endl;
    }
    return 0;
}

C++: #include <iostream>

int main(){
    int a[10];
    for(int i = 0; i < 10; i++){
        std::cin >> a[i];
    }
    
    for(int k = 0; k < 3; k++){
        int idx = 0;
        for(int i = 0; i < 10; i++){
            if(a[idx] < a[i]){
                idx = i;
            }
        }
        std::cout << a[idx] << std::endl;
        a[idx] = 0;
    }
    return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
	int m[10];
	int i,j;
	for(i=0;i<10;i++){
		cin >> m[i];
	}
	int tmp;
	for(i=0;i<9;i++){
		for(j=i+1;j<10;j++){
			if(m[i] <= m[j]){
				tmp = m[i];
				m[i] = m[j];
				m[j] = tmp;
			}
		}
	}
	for(i=0;i<3;i++)
		cout << m[i] << endl;
	return 0;
}

C++: #include <stdio.h>

int main(){
	int i,j;
	int h1=0,h2=0,h3=0;
	
	for(i=1;i<10;i++){
		scanf("%d\n",&j);
		if(j>=h1){
			h3=h2;
			h2=h1;
			h1=j;
		}
		else if(j>=h2){
			h3=h2;
			h2=j;
		}
		else if(j>=h3){
			h3=j;
		}
	}
	return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
	long long a[100];
	long long max, bat,temp, temp1;
	bat = 10;
	for (int i = 1; i <= 10; i++)
		cin >> a[i];
	
	for (int i = 1; i <= 11; i++)
	{
		max = 0;
		for (int j = 1; j <= bat; j++)
			if(a[j] > max)
			{
				max = a[j];
				temp1 = j;
			}
		
		temp = a[bat];
		a[bat] = a[temp1];
		a[temp1] = temp;
		bat--;
		
	}
	for (int i = 10; i > 7; i--)
		cout << a[i] << endl;
	
}

C++: #include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <queue>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <fstream>
#include <stdio.h>

using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef pair<int, PII> TII;
typedef long long LL;
typedef vector<LL> VLL;

//container util

//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define MT(a,b,c) MP(a, MP(b, c))

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

int main(void){
	VI v(10);
	REP(i,10)cin>>v[i];
	SORT(v);
	REP(i,3)cout << v[9-i] << endl;
	return 0;
}

C++: #include <iostream>
using namespace std;

int main() {
	int a[10];
	for(int i=0;i<10;i++)
	cin>>a[i];
	for(int j=0;j<10;j++)
	{for(int i=0;i<10-1;i++)
	{
		if(a[i]<a[i+1])
		{
			int temp;
			temp=a[i];
			a[i]=a[i+1];
			a[i+1]=temp;
		}
	}}
	for(int i=0;i<3;i++)
	cout<<a[i]<<endl;
	return 0;
}

C++: #include <iostream>
#include <array>
#include <algorithm>

int main()
{
	std::array<int, 10> high;
	for (int i = 0; i < 10; ++i)
		std::cin >> high[i];

	std::sort(high.begin(), high.end());

	std::cout << high[9] << " " << high[8] << " " << high[7] << std::endl;
}

C++: int main()
{
	int i,j;
	int rank1 = 0;
	int mountain[10] = {0};
	for (i = 0; i < 10; i++) {
		scanf_s("%d", &mountain[i]);
	}



	for (i = 0; i < 10; i++) {
		for (j = i + 1; j < 10; j++) {

			if (mountain[j] > mountain[i])
			{
				rank1 = mountain[i];
				mountain[i] = mountain[j];
				mountain[j] = rank1;
			}
		}
	}

	for (i = 0; i < 3; i++) {
		printf("%d\n", mountain[i]);

		}
	
	


    return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;

int main() {

    vector<int> vec;
    int t;
    while(cin >> t) {
       vec.push_back(t);
    }

    sort(vec.begin(), vec.end(), greater<int>());

    for(int i = 0; i < 3; i++) {
        cout << vec[i] << endl;
    }

    return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>

class top3hills {
public:
    top3hills();
    // top3hills(const top3hills& old);
    // ~top3hills();
    bool Run();

private:
    bool input();
    bool calc();
    void show() const;
public:
    static const int ReadMax;
    static const int ShowMax;

private:
    std::vector<int> m_mountData;   // List of mount
    std::vector<int> m_top3hills;   // List of top3 hills
};

const int top3hills::ReadMax = 10;
const int top3hills::ShowMax = 3;

top3hills::top3hills()
{

}

bool top3hills::Run()
{
    bool status = false;

    status = input();
    if (!status) {
        std::cerr << "input falure." << std::endl;
    }
    status = calc();
    if (!status) {
        std::cerr << "calc failure." << std::endl;
    }
    show();

    return true;
}

bool top3hills::input()
{
    int mountData = 0;

    for (int i = 0; i < ReadMax; ++i) {
        if (ReadMax <= i || ReadMax < m_mountData.size()) {
            return false;
        }
        std::cin >> mountData;
        m_mountData.push_back(mountData);
    }

    return true;
}

bool top3hills::calc()
{
    // Sort mount data
    std::sort(m_mountData.begin(), m_mountData.end());

    // Reverse mount data
    std::reverse(m_mountData.begin(), m_mountData.end());

    for (int i = 0; i < ShowMax; ++i) {
        if (ShowMax <= i || ShowMax < m_top3hills.size()) {
            return false;
        }
        m_top3hills.push_back(m_mountData.at(i));
    }

    return true;
}

void top3hills::show() const
{
    for (int i = 0; i < ShowMax; ++i) {
        std::cout << m_top3hills.at(i) << std::endl;
    }
}

int main()
{
    top3hills top3;
    top3.Run();
}

C++: #include <iostream>
using namespace std;

int main()
{
	int n, i , a[10];
	n=10;
	for (i=1;i<=n;i++) cin >>a[i];
	int j,tam;
	for (i=1;i<=n-1;i++)
	 for (j=i+1;j<=n;j++)
		 if (a[i]<a[j]) { tam=a[i];a[i]=a[j];a[j]=tam;}
	cout << a[1] << endl;
	cout << a[2] << endl;
	cout << a[3] << endl;
	return 0;
}

C++: lis=[];

for i in range(10):
    h=int(input());
    lis.append(h);
    
for i in range(10):
    for j in range(10):
        if lis[i]<lis[j]:
            a=lis[i];
            lis[i]=lis[j];
            lis[j]=a;
            
for i in range(3):
    print(lis[i]);