Go: package main

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

var (
	n  = 10
	sc = bufio.NewScanner(os.Stdin)
)

func main() {
	heights := make([]int, n, n)
	for i := 0; i < n; i++ {
		sc.Scan()
		heights[i], _ = strconv.Atoi(sc.Text())
	}
	sort.Sort(sort.Reverse(sort.IntSlice(heights)))

	for i := 0; i < 3; i++ {
		fmt.Println(heights[i])
	}
}

C++: #include <iostream>

using namespace std;

int a[100000];
void sort( int * a, int i)
{
    int j, k;
    for( j = 0; j < i; j++ )
    {
        int min_index = j;
        for( k = j+1; k < i; k++ )
        {
            if( a[k] < a[min_index] )
                min_index = k;
        }
        if( j != min_index )
        {
            int tmp = a[j];
            a[j] = a[min_index];
            a[min_index] = tmp;
        }
    }
}
int main()
{
    int i = 0, j;
    while( cin >> a[i++] )
        ;
    sort( a, i );
    for( j = i - 3; j < i; j++ )
        cout << a[j] << endl;
    return 0;
}

C++: #include <algorithm>
#include <deque>
#include <functional>
#include <iostream>

using namespace std;

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

	partial_sort( hills, hills + 2, hills+9, greater<int>() );
    
    for(int i=0;i<3;i++){
        cout << hills[i] <<endl;
    }
    
	return 0;
}

C++: #include<stdio.h>

int main(void)
{
	int high[10]={1819,2003,876,2840,1723,1673,3776,2848,1592,922};
	int x,max,time;


	for(time=1;time<=3;time++)
	{
		max=0;

		for(x=0;x<10;x++)
		{
			if(max<high[x])
			{
				max=high[x];
			}
		}
		for(x=0;x<10;x++)
		{
			if(max==high[x])
			{
				printf("%d\n",high[x]);
				high[x]=0;
			}
		}
	}

	return 0;
}

C++: #include <iostream>
using namespace std;
int main(void){
    int fst = 0;
    int snd = 0;
    int thd = 0;
    int tmp=0;
    std::cin >> fst;
    for(int i=0;i<9;i++) {
        tmp = 0;
        std::cin >> tmp;
        if(fst < tmp) {
            thd = snd;
            snd = fst;
            fst = tmp;
        }else if(tmp > snd){
            thd = snd;
            snd = tmp;
        }else if(tmp > thd){
            thd = tmp;
        }else{}
    }
    printf("%d\n%d\n%d\n",fst,snd,thd);
}

C++: #include <stdio.h>

int main(void){
	int n[10],i,j,w;
	
	for(i=0;i<=9;i++){
		scanf("%d",&n[i]);
	}
	for(i=0;i<10;i++){
		for(j=i+1;j<10;j++){
			if(n[i]<n[j]){
				w=n[i];
				n[i]=n[j];
				n[j]=w;
			}
		}
	}
	for(i=0;i<=2;i++){
		printf("%d\n",n[i]);
	}
	return 0;
}

C++: 
#include<stdio.h>
using namespace std;

int main()
{
	int length;
	int a, b, c,tmp;
	a = b = c = 0;

	for (int i = 0; i < 10; i++)
	{
		scanf("%d",&length);
		if (length > a)
		{
			if (length > b)
			{
				a = b;
				if (length > c)
				{
					b = c;
					c = length;
				}
				else
				{
					b = length;
				}
			}
			else
			{
				a = length;
			}
		}
	}
	printf("%d\n", c);
	printf("%d\n", b);
	printf("%d\n", a);
	return 0;
}

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

int main(){

  int x,a=0,b=0,c=0,q=-1,p=-1;

  for(int i=0;i<10;i++){
   cin >> x;
  
   if(x>c){
    if(x>b){
      if(x>a){
	q=a;
	a=x;
      }
      if(q!=-1){
	p=b;
	b=q;
      }else{
	p=b;
	b=x;
      }
    }
    if(p!=-1){
      c=p;
    }else{
      c=x;
    }
   }
   p=-1;
   q=-1;
  }
      
  cout << a << endl;
  cout << b << endl;
  cout << c << endl;
	  
	  

 return 0;
}

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

int main(){

	int hill[]={0,0,0,0,0,0,0,0,0,0};

	for(int j=0;j<=9;j++){
		cin>>hill[j];
	}

	int key;
	int flag;

	//sort
	for(key=9;key>=0;key--){

		for(int i=0;i<=key;i++){
			if(hill[i]>hill[i+1]){
				flag=hill[i];hill[i]=hill[i+1];hill[i+1]=flag;
			}
		}

	}

	cout<<hill[9]<<"\n"<<hill[8]<<"\n"<<hill[7]<<endl;

	return 0;

}

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

int main(){

	int hill[]={0,0,0,0,0,0,0,0,0,0};

	for(int j=0;j<=9;j++){
		cin>>hill[j];
	}

	int key;
	int flag;

	//sort
	for(key=9;key>=0;key--){

		for(int i=0;i<=key;i++){
			if(hill[i]>hill[i+1]){
				flag=hill[i];hill[i]=hill[i+1];hill[i+1]=flag;
			}
		}

	}

	cout<<hill[9]<<"\n"<<hill[8]<<"\n"<<hill[7]<<endl;

	return 0;

}

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

int main()
{
    vector<int> v(10);
    for (int i = 0; i < 10; i++)
    {
        cin >> v[i];
    }
    sort(v.rbegin(), v.rend());
    for (int i = 0; i < 3; i++)
    {
        cout << v[i] << endl;
    }
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int m[10];
  for(int i=0;i<10;i++){
    cin>>m[i];
  }
  sort(m,m+10);
  reverse(m,m+10);
  cout<<m[0]<<endl;
  cout<<m[1]<<endl;
  cout<<m[2]<<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++: #include<stdio.h>

int main(){
int i,j,yama[10],temp;
for(i=0;i<10;i++){
scanf("%d",&yama[i]);
}
for(i=0;i<10;i++){
for(j=0;j<10;j++){
if(yama[i]>yama[j]){
temp=yama[i];
yama[i]=yama[j];
yama[j]=temp;
}
}
}
for(i=0;i<3;i++){
printf("%d\n",yama[i]);
}
return 0;
}

C++: #include<iostream>
using namespace std;
int main() {
	int height[10], i, a=0, b=0, c=0;
	for (i = 0; i < 10; i++) {
		cin >> height[i];
	}
	for (i = 0; i < 10; i++) {
		if (height[i] >= a) {
			b = a;
			a = height[i];
		}
		else if (height[i] >= b) {
			c = b;
			b = height[i];
		}
		else if (height[i] >= c) {
			c = height[i];
		}
	}
	cout << a << endl << b << endl << c << endl;
	return 0;
}

C++: #include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;

int main(){
	int m;
	int max[3] = {0};
	for(int i = 0; i < 10; i++){
		cin >> m;
		if(m > max[0]){
			max[2] = max[1];
			max[1] = max[0];
			max[0] = m;
		}else if(m > max[1]){
			max[2] = max[1];
			max[1] = m;
		}else if(m > max[2]){
			max[2] = m;
		}
	}
	
	cout << max[0] << endl;
	cout << max[1] << endl;
	cout << max[2] << endl;
	
    return 0;
}

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

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

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

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

  for(int i = 0 ; i < 10 ; i++)
    {
      for(int j = i + 1 ; j < 10 ; j++)
	{
	  if(height[i] < height[j])
	    {
	      int dumy = height[i];
	      height[i] = height[j];
	      height[j] = dumy;
	    }
	}
    }
  for(int i = 0 ; i < 3 ; i++)
    {
      cout << height[i] << endl;
    }
  return 0;
}

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

using namespace std;

int main(){
   int n[10];
   
   for(int i = 0; i < 10; i++) cin >> n[i];
   sort(n, n+10);
   for(int i = 9; i >6; i--) cout << n[i]<< endl;
   return 0;
}