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 <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef pair<int, int> ii;
typedef pair<ll, int> li;
typedef pair<int, ll> il;
typedef vector<ii> vii;
typedef vector<il> vil;
typedef vector<li> vli;

#define F first
#define S second
#define pb(x) push_back(x)
#define mp(a,b) make_pair(a,b)
#define sz size()
#define all(A)    A.begin(), A.end()
#define mem(a, b) memset(a, b, sizeof(a))
#define f0(i,b)   for(int i=0;i<(b);i++)
#define f1(i,b)   for(int i=1;i<=(b);i++)
#define f2(i,a,b) for(int i=(a);i<=(b);i++)
#define fr(i,b,a) for(int i=(b);i>=(a);i--)
#define rep(i,a,b,c) for(int i=(a);i!=(b);i+=(c))
#define mod 1000000007

#define forr(i,n)    for(i=0; i<n; i++)
#define whilee(i,t)  while(i!=t)
#define  sl(a)  scanf("%lld",&a)
#define  pl(a)  printf("%lld",a)

//for(auto it =A.begin(); it!=A.end(); it++)
//sort(A.begin(),A.end());
//binary_search(A.begin(),A.end(),x);
//reverse(A.begin(), A.end());
//cout << *max_element(A.begin(), A.end());
//cout << *min_element(A.begin(), A.end());
//count(A.begin(), A.end(), X); //counts the occurrences of X
//distance(A.begin(),A.end());  //distance between first to last element
//accumulate(A.begin(), A.end(), 0); //add
//next_permutation(A.begin(), A.end());
//prev_permutation(A.begin(), A.end());
//swap(S[0], T[0]);
//scanf("%d",&x);
//printf("%d\n",x);

//vector <int> A;
//deque <int> A;
//queue <int> A;
//stack <int> A;
//set <int> A;
//map <int,int> A;
//pair <int,int> A ;
//vector <pair <int,int>> A ;
//char ch;
//string S, T, U;
ll i, j, k, a, b, c, d, f, g, h, l, m, n=10, p, q, r, s, t, w, x, y, z, maxx=INT_MIN, minn=INT_MAX, ans=0, sum=0, cnt=0;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int A[10];

    forr(i,n)
    {
        cin>>A[i];
    }
    sort(A,A+n, greater<>());
    forr(i,3)
    {
        cout<<A[i]<<endl;
    }
    return 0;
}

C++: #include<stdio.h>
#define ARRAY_SIZE 10
#define MAX_VALUE 10000
#define MIN_VALUE 0

int searchMax();
int *heightList;

int main(void){
  heightList = new int[ARRAY_SIZE];

  for(int i = 0;i < ARRAY_SIZE;i++){
    scanf("%d",&heightList[i]);
    printf("\ncount %d ; %d\n",i,heightList[i]);
    if(heightList[i] < MIN_VALUE || heightList[i] > MAX_VALUE){
      i--;
      continue;
    }
  }
  for(int i = 0;i < 3;i++){
    printf("%d\n",searchMax());
  }

  delete(heightList);

  return 0;
}

int searchMax(){
  int maxValue = -1;
  int index = -1;

  for(int i = 0;i < ARRAY_SIZE;i++){
    if(maxValue < (heightList[i])){
      maxValue = (heightList[i]);
      index = i;
    }
  }

  if(index != -1){
    (heightList[index]) = 0;
  }
  else{
    return -1;
  }

  return maxValue;
}

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

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

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

using namespace std;

const int N = 10;
int a[N];

int main() {
  for(int i = 0; i < N; i++) {
    scanf("%d", &a[i]);
  }
  sort(a, a+N);
  for(int i = 1; i <= 3; i++) printf("%d/n", a[N-i]);
}

C++: #include <stdio.h>
void SimpleSelectionSort(int* array,int n){
    int temp=0;
    int i = 0;
    int j = 0;

    for(i = 0;i<n-1;i++){
        for(j=i+1;j<n;j++){
            if(array[i] < array[j]){
                temp = array[i];
                array[i] = array[j];
                array[j] = temp;
            }
        }
    }

    return;

}

int main(void){
    int array[10];
    int i = 0;
    for(i=0;i<10;i++){
        scanf("%d" ,&array[i]);
    }

    SimpleSelectionSort(array , 10);

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

    return 0;
}

C++: #include "bits/stdc++.h"

#define REP(i,num) for(int i=0;i<(num);++i)
#define ALL(c) c.begin(),c.end()
#define PRINTALL(c) for(auto& x:c){cout<<x<<' ';}cout<<endl;
#define PAIRCOMP(c,comp) [](const pair<ll,ll>& lhs,const pair<ll,ll>& rhs){return lhs.c comp rhs.c;}

using namespace std;
using ll = long long;

constexpr ll atcoder_mod = 1e9+7;

template<typename T=int>
T in(){T x; cin >> x; return (x);}
template<typename T=int,typename C=vector<T>>
C vecin(int N){C x(N);REP(i,N){x[i]=in<T>();}return move(x);}

void vout(){cout << endl;}
template<typename Head,typename... Tail>
void vout(Head&& h,Tail&&... t){cout << ' ' << h;vout(forward<Tail>(t)...);}
void out(){cout << endl;}
template<typename Head,typename... Tail>
void out(Head&& h,Tail&&... t){cout << h;vout(forward<Tail>(t)...);}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	auto H=vecin(10);
	sort(ALL(H),greater<int>());
	REP(i,3){
		out(H[i]);
	}
	return 0;
}

C++: #include<iostream>
using namespace std;
int main()
{
	int height[10];
	int x;

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

	for(int j=10;j>0;j--){
		for(int i=10;i>0;i--){
			if(height[i]>height[i-1]){
				x=height[i-1];
				height[i-1]=height[i];
				height[i]=x;
			}
		}
	}

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

C++: #include <iostream>
#include <algorithm>
using namespace std;
bool cmp(int a,int b){return a>b;}
int main(){
int a[10];
for(int i=0;i<10;i++)
cin>>a[i];
sort(a,a+10,cmp);
cout<<a[0]<<endl<<a[1]<<endl<<a[2]<<endl;



}

C++: #include<cstdio>
#define rep(i,a,b) for(int i = (a); i<=(b); i++)
using namespace std;
int a[3];
int main()
{
    int i,j;
        while(scanf("%d",&i)==1)
        {
            if(i>a[0]) { a[2]=a[1]; a[1]=a[2]; a[0]=i;}
            else if(i>a[1]) { a[2]=a[1];a[1]=i;}
            else if(i>a[2]) a[2]=i;
        }
        rep(i,0,2) printf("%d\n",a[i]);
        return 0;
}

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

int main() {
    std::vector<int> hills;
    for (int i = 0; i < 10; i++) {
        std::string input;
        std::cin >> input;
        int height = std::stoi(input);
        hills.push_back(height);
    }

    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 <iostream>
#include <algorithm>

using namespace std;

int main(){

	int a[12];
	for(int i=0;i<10;i++){
	cin>>a[i];

	}
	sort(a,a+10);
	cout<<a[9]<<endl;
	cout<<a[8]<<endl;
	cout<<a[7]<<endl;

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;
}