Go: package main

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

var sc = bufio.NewScanner(os.Stdin)

func main() {
	heights := make([]int, 10)
	for i := 0; i < 10; 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 <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <limits.h>
#include <iostream>
#include <algorithm>
#include <string>
#include <iterator>
#include <vector>
#include <map>
#include <utility>
#define LLU unsigned long long int
#define LL long long int
#define LD long double
using namespace std;
#define LLUmax ULLONG_MAX
#define LLmax LLONG_MAX
#define dmax INT_MAX
#define vd vector<int>
#define vLL vector<long long int>
#define vLLU vector<unsigned long long int> 
#define pb push_back
#define mp make_pair
#define fi first
#define sec second
#define debug printf("asd\n")
#define debugd(a) printf("--%d\n",a)
#define debugdd(a,b) printf("--%d %d\n",a,b)
#define debugarr(a,b) for(int i=0 ; i<b ; i++)printf("%d ",a[i]);printf("\n")
#define newline printf("\n")
#define forin(a,b,c) for(int a=b ; a<c ; a++)
#define forde(a,b,c) for(int a=b ; a<c ; a--)


inline void scd(int &a){scanf("%d",&a);}
inline void scdd(int &a,int &b){scanf("%d %d",&a,&b);}
inline void sctd(int &a,int &b,int &c){scanf("%d %d %d",&a,&b,&c);}
inline void scdlld(long int &a,long int &b){scanf("%I64d %I64d",&a,&b);}
inline void sclld(long long int &a){scanf("%I64d",&a);}

#define scarrd(a,b) for(int index=0 ; index<b ; index++)scanf("%d",&a[index])
#define prdlld(a,b) printf("%I64d %I64d",a,b)
#define prdd(a,b) printf("%d %d",a,b)
#define prd(a) printf("%d",a)
#define prarr(a,b) for(int i=0 ; i<b ; i++)printf("%d ",a[i])
#define iniarr(a,b) for(int i=0 ; i<b ;i++)a[i]=0
#define arr(a,b) int *a=(int *)malloc(b*sizeof(int))
#define llarr(a,b) long long int *a=(long long int *)malloc(b*sizeof(long long int))
#define st(a,b) char *a=(char *)malloc(b*sizeof(char))
#define grav 9.8
#define pi 3.14159265

bool cmp(int a,int b)
{
	return a>b;
}
int main()
{
	int a[2000];
	scarrd(a,10);
	sort(a,a+10,cmp);
	forin(i,0,3)
	printf("%d\n",a[i]);
	
	return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
  int a;
  int x=0;
  int y=0;
  int z=0;
  for(int i=1;i<=10;i++){
    cin >> a;
    if(a>x){
      z=y;
      y=x;
      x=a;
    }else if(y<a && a<=x){
      z=y;
      y=a;
    }else if(z<a && a<=y){
      z=a;
    }
  }
  cout << x << endl;
  cout << y << endl;
  cout << z << endl;
}

C++: #include<iostream>
int main(void){
    int h;
    int t[3] = {0, 0, 0};
    for(int i = 0; i < 10; i++){
        std::cin >> h;
        for(int i = 0; i < 3; i++){
            if(t[i] <= h){
                switch(i){
                    case 0:
                        t[i+2] = t[i+1];
                        t[i+1] = t[i];
                        t[i] = h;
                        break;
                    case 1:
                        t[i+1] = t[i];
                        t[i] = h;
                        break;
                    case 2:
                        t[i] = h;
                }
                break;
            }
        }
    }
    for(int i = 0; i < 3; i++){
        std::cout << t[i] << std::endl;
    }
    return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
  int a[11];
  int temp;
  for(int i=0;i<10;i++){
    cin>>a[i];
  }
  for(int j=0;j<10;j++){
    for(int i=0;i<10-1-j;i++){
      if(a[i]<a[i+1]){
	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 <vector>
#include <iostream>
#include <algorithm>

using namespace std;

int main(){
  int n = 10;
  vector<int> a;

  for(int i = 0; i < n; i++){
    int tmp;
    cin >> tmp;
    a.push_back(tmp);
  }

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

  cout << a[0] << endl;
  cout << a[1] << endl;
  cout << a[2] << endl;
  
  return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
 
using namespace std;
 
vector<int> heights;
int input;
 
int main(){
 while(cin >> input) heights.push_back(input);
 sort(heights.begin(), heights.end());
 auto itr = heights.end()-1;
 cout << *itr << "\n" << *(itr-1) << "\n" << *(itr-2) << endl;
 
 return 0;
}

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

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

 for(int i=0; i<3; i++){
  int n = h[0];
  int m = -1;
  for(int j=1; j<10; j++)
   if(n < h[j]){
    n = h[j];
    m = j;
   }
  cout << n << '\n';
  h[m] = -1;
 }

 return 0;
}

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

#define MAX_N 10000

int main() {
    vector<int> v;

    int num;
    while (cin >> num) {
        v.push_back(num);
    }

    sort(v.begin(), v.end());

    int n = 3;
    for (int i = v.size() - 1 ; i >  v.size() - (n + 1) ; i--) {
        cout << v[i] << endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> P;
typedef pair<ll, P> P3;
typedef pair<P, P> PP;
constexpr ll MOD = ll(1e9 + 7);
constexpr int IINF = INT_MAX;
constexpr ll LLINF = LLONG_MAX;
constexpr int MAX_N = int(1e5) + 5;
constexpr double EPS = 1e-9;
constexpr int di[] = {0, 1, 0, -1}, dj[] = {1, 0, -1, 0};
#define REP(i, n) for (int i = 0; i < n; i++)
#define REPR(i, n) for (int i = n; i > 0; i--)
#define SORT(v) sort((v).begin(), (v).end())
#define SORTR(v) sort((v).rbegin(), (v).rend())
#define ALL(v) (v).begin(), (v).end()

int main() {
    int h[10];
    for(int i=0;i<10;i++){
        cin >> h[i];
    }
    sort(h,h+10);
    for(int i=9;i>=7;i--){
        cout << h[i] << endl;
    }
    return 0;
}