Go: package main

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

var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := rdr.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}

func toInt(str string) int {
	n, _ := strconv.Atoi(str)
	return n
}

func main() {
	lst := make([]int, 0)
	for i := 0; i < 10; i++ {
		lst = append(lst, toInt(readLine()))
	}
	sort.Ints(lst)
	for i := 9; i > 6; i-- {
		fmt.Println(lst[i])
	}
}

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

int main()
{
    int num=10;
    int test[num];
    
    for(int i=0; i<10; i++)
    {
        cin>>test[i];
    }
    for(int s=0; s<9; s++)
    {
        for (int t=s+1; t<10; t++)
        {
            if(test[s]<test[t])
            {
                int a=test[t];
                test[t]=test[s];
                test[s]=a;
            }
        }
    }
   
        cout<< test[0] <<endl<< test[1] <<endl<< test[2]<<endl;
    
    return 0;
}

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

int main() {
    std::vector<int> hills;
    
    int n;
    while (std::cin >> n) {
        hills.push_back(n);
    }
    
    std::sort(hills.begin(), hills.end(), std::greater<int>());
    
    for (int i = 0; i < 3; ++i) {
        std::cout << hills[i] << std::endl;
    }
    
    return 0;
}

C++: #include <stdio.h>
#include <algorithm>
using namespace std;
int main(){
	const int N=10;
	int height[N];
	for(int i=0;i<10;i++){
		scanf("%d",&height[i]);
	}
	sort(height,height+N);
	reverse(height,height+N);
	for(int j=0;j<3;j++){
		printf("%d",height[j]);
	}
	return 0;
}

C++: #include <iostream>
#include <array>
#include <algorithm>
  
int main(){
    std::array<u_int, 10> heights;
     
    for (u_int i = 0; i < 10; ++i){
        std::cin >> heights[i];
    }
     
    std::sort(heights.begin(), heights.end(), std::greater<u_int>());
     
    for (u_int i = 0; i < 3; ++i){
        std::cout << heights[i] << std::endl;
    }
	
    return 0;
}

C++: #include "iostream"
using namespace std;
int main(int argc, char const *argv[])
{
	int mtain[10];

	for (int i = 0; i < 10; ++i)
	{
		cin >> mtain[i];
	}

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

			if(mtain[i] < mtain[j]){
				work = mtain[i];
				mtain[i] = mtain[j];
				mtain[j] = work;
				cout << "mtain[" << i << "] = " << mtain[i] << endl;
				cout << "mtain[" << j << "] = " << mtain[j] << endl;
			} 
		}
	}

	cout << mtain[0] << endl;
	cout << mtain[1] << endl;
	cout << mtain[2] << endl;

	return 0;
}

C++: #include <iostream>
#include <queue>

using namespace std;

int main() {
    priority_queue<int> pq;

    for (int i = 0; i < 10; ++i) {
        int height;
        cin >> height;
        pq.emplace(height);
    }


    for (int i = 0; i <= 2; ++i) {
        std::cout << pq.top() << endl;
        pq.pop();
    }

    return 0;
}

C++: #include <stdio.h>

int main(){
	int talls[10], max, banme;
	for(int i = 0; i < 10; i++) scanf("%d", &talls[i]);
	for(int i = 0; i < 10; i++){
		max = 0;
		for(int j = 0; j < 10; j++){
			if(max < talls[j]){
				max = talls[j];
				banme = j;
			}
		}
		printf("%d\n", max);
		talls[banme] = 0;
	}
	return 0;
}

C++: #include <cstdlib> 
#include <iostream>

using namespace std;

int cmp(int* a, int* b)
{
	return (*a < *b) ? 1 : ((*a > *b) ? -1 : 0);
}

int main()
{
	int dat[10];

	for (int i = 0; i < 10; i++)
	{
		cin >> dat[i];
	}

	qsort(dat, 10, sizeof(int), reinterpret_cast<int(*) (const void*, const void*)>(cmp));

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

	return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

int fir[3] = {0, 0, 0};

int* recal(int* arr, int newval){
    for(int i = 0; i < 3; i++){
        if(arr[i] <= newval){
            swap(arr[i], newval);
        }
    }
    return arr;
}

int main(){
    for(int i = 0; i < 10; i++){
        int t;
        cin >> t;
        recal(fir, t);
    }
    for(int i = 0; i <3; i++){
        cout << fir[i] << endl;
    }
    return 0;
}

C++: #include <stdio.h>

int num[13] ;
int ans[3] ;

int main ( )
{
	while ( scanf ( "%d" , &num[0] ) == 1 ) {
		for ( int i = 1 ; i < 10 ; i++ ) {
			scanf ( "%d" , &num[i] ) ;
		}
		ans[0] = num[0] ;
		ans[1] = ans[2] = 0 ;
		for ( int i = 1 ; i < 10 ; i++ ) {
			if ( num[i] >= ans[0] ) {
				ans[2] = ans[1] ;
				ans[1] = ans[0] ;
				ans[0] = num[i] ;
			}
			else if ( num[i] >= ans[1] && num[i] < ans[0] ) {
				ans[2] = ans[1] ;
				ans[1] = num[i] ;
			}
			else if ( num[i] >= ans[2] && num[i] < ans[1] ) {
				ans[2] = num[i] ;
			}
		}
		for ( int i = 0 ; i < 3 ; i++ ) {
			printf ( "%d\n" , ans[i] ) ;
		}
	}
	return 0 ;
}

C++: /*
　　　　 ∧＿∧　にっぽんちゃちゃちゃ
　／＼（　・∀・）／ヽ
（ ●　と　　　つ　● ）　にっぽんちゃちゃちゃ
　＼/⊂、 ノ　　＼ノ
　　　　　し'
*/
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define repone(i,n) for(int i=1;i<(int)(n);++i)
#define repo(i,o,n) for(int i=o;i<(int)(n);++i)
#define Rep(j,n) for(int j=0;j<(int)(n);++j)
#define Repone(j,n) for(int j=1;j<(int)(n);++j)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define int long long
#define MOD 1000000007
#define INF 9223372036854775807


signed main()
{
  string xyz ="";
int x=0,y=0,z=0,w=0,i=0,j=0,n=0;
std::vector<int> v;
rep(i,10){
std::cin >> x;
v.push_back(x);
  }
  sort(rall(v));
rep(i,3){
  std::cout << v[i] << '\n';
}
}

C++: #include<stdio.h>
int main(){
    int l[10],r[10]={-1};
    int i,j,k,c[10],n=0;
    for(i=0;i<10;i++){
        c[i]=11;
    }
    for(i=0;i<10;i++){
        scanf("%d",&l[i]);
    }
    for(j=0;j<10;j++){
        for(i=0;i<10;i++){
            for(k=0;k<10;k++){
                if(c[k]==i){
                    n=1;
                }
            }
            if(!(n==1)){
                if(l[i]>=r[j]){
                    r[j]=l[i];
                    c[j]=i;
                }
            }
            n=0;
        }
    }
    for(i=0;i<3;i++){
        printf("%d\n",r[i]);
    }
    return 0;
}

C++: #include<stdio.h>
#include<iostream>

using namespace std;

int MAX(int a,int b){
	if(a>b) return a;
	else return b;
}

int MIN(int a,int b){
	if(a>b) return b;
	if(a<b) return a;
	else return b;
}


int main(){
	int moun[11];
	for(int i=0;i<10;i++)
		cin>>moun[i];
	int no1,no2,no3,n=0,p=0,w=0;
	
		no1=MAX(moun[n],moun[n+1]);
		for(n=2;n<8;n++)
		no1=MAX(no1,moun[n]);
		for(int o=0;o<10;o++){
			if(no1==moun[o])
				moun[o]=0;
		}

	    no2=MAX(moun[p],moun[p+1]);
		for(p=2;p<8;p++)
		no2=MAX(no2,moun[p]);
		for(int q=0;q<10;q++){
			if(no2==moun[q])
				moun[q]=0;
		}

		no3=MAX(moun[w],moun[w+1]);
		for(w=2;w<8;w++)
		no3=MAX(no3,moun[w]);
		for(int l=0;l<10;l++){
			if(no3==moun[l])
				moun[l]=0;
		}
		cout<<no1<<" "<<no2<<" "<<no3<<"\n";

	return 0;
}

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

const int MAX_N = 9;
int a[MAX_N];
  
int main(){

    for(int i=0; i<=MAX_N; i++){
        cin >> a[i];
    }
     
    sort(a,a+10);
    cout << a[9] << endl << a[8] << endl << a[7] << endl;

    return 0;
}

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

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