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 <iostream>
#include <algorithm>
#include <vector>
#include <cstdio>
#include <string>
#include <set>
#include <queue>
#include <stack>
#include <cmath>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long > vll;
typedef vector< vi > vvi;
int H[10];
int main() {
	int n;
	vi H(n);
	for (int i = 0; i < 10; i++) {
		cin >> H[i];
	}
	sort(H.rbegin(), H.rend());
	for (int i = 0; i <3 ; i++) {
		cout << H[i] << endl;
	}
}

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

int main()
{
	int a[10];

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

	sort(a, a + 10, greater<int>());

	for(int i = 0; i < 3; i++)
		cout << a[i] << endl;

	return 0;
}

C++: //include----------------------------------------------------------------------------------------------------------------------
#include <bits/stdc++.h>
 
//using namespace--------------------------------------------------------------------------------------------------------------
using namespace std;
 
//define-----------------------------------------------------------------------------------------------------------------------
#define rep(i, n) for(int i = 0; i < (int)n; i++)
#define FOR(i, s, n) for(int i = s; i < (int)n; i++)
#define per(i, n) for(int i = n; i >= 0; i--)
#define ROF(i, s, n) for(int i = s; i >= (int)n; i--)
#define FORIT(i, A) for (auto i : A)
#define PRINT(x) cout << (x) << "\n"
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define EACH(i, n) for (__typeof((n).begin()) i = (n).begin(); i != (n).end(); ++i)
#define SZ(a) int((a).size())
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define INF 1 << 25
#define CLR(a) memset((a), 0 ,sizeof(a))
#define dump(x) cerr << #x << " = " << (x) << "\n";
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << "\n";
#define sq(n) (n) * (n)
 
//typedef----------------------------------------------------------------------------------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;
typedef unsigned int uint;
typedef unsigned long long ull;
 
//const------------------------------------------------------------------------------------------------------------------------
const double EPS = 1e-10;
const double PI = acos( -1.0 );
 
//global-----------------------------------------------------------------------------------------------------------------------
vector<int> a(10);
 
//function---------------------------------------------------------------------------------------------------------------------
int main() {
    rep( i, 10 ) {
        scanf( "%d", &a[ i ] );
    }
    sort( a.begin(), a.end() );
    ROF( i, 9, 7 ) {
        printf( "%d\n", a[ i ] );
    }
    return 0;
}

C++: #include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<iostream>
#include<algorithm>
#include<string>
using namespace std; 
int cmp(int a, int  b){
	return a>b;
}
int main(){
	    int num[11];
    for( int i = 0; i < 10; i ++)cin>> num[i];
	sort(num,num+10,cmp);
	
	for( int i = 0; i < 3; i ++)cout << num[i]<<endl; 
	return 0;
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
int main(void){
std::vector<int> h;
int tmp;
while(std::cin>>tmp){
h.push_back(tmp);
}

auto p=std::unique(h.begin(),h.end());
std::sort(h.begin(),p);
auto q=std::unique(h.begin(),p);
for(int i=0;i<3;i++){
std::cout<<h[i]<<std::endl;
}
return 0;
}

C++: //include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <fstream>
#include <complex>
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();}

//math
//-------------------------------------------
template<class T> inline T sqr(T x) {return x*x;}

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef pair<long, long> PLL;
typedef long long LL;
//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())

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

//constant
//--------------------------------------------

//clear memory
#define CLR(a) memset((a), 0 ,sizeof(a))

const double EPS = 1e-12;
const double INF = 1e12;

int a[10];
int main(){
	REP(i,10)cin>>a[i];
	sort(a,a+10,greater<int>());
	REP(i,3)cout<<a[i]<<endl;
	return 0;
}

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

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

C++: #include<algorithm>a[10],imain(){    for(;i<10;scanf("%d",a+i++)); sort(a,a+10);for(;i>7;printf("%d\n",a+--i));return 0;}

C++: #include<stdio.h>
     
int main(void){
     
    /* 宣言と初期化 */
    int hai[10];
    int i;
    int temp2nd;
    int temp3rd;
    int tempmax;
     
for(i=0;i<10;i++)
{
scanf("%d",&hai[i]);
}
    /* 代入 */
    temp2nd=hai[0];
    tempmax=hai[0];
    temp3rd=hai[0];
     
    /* 計算 */
    for(i=0;i<10;i++){
        /* 最大値求める */
        if(hai[i]>tempmax)
       { tempmax=hai[i];hai[i]=0;}
    }
     
    for(i=0;i<10;i++){
        /*2番目求める */
        if(hai[i]<tempmax&&hai[i]>temp2nd)
        {temp2nd=hai[i];hai[i]=0;}
    }
     
    for(i=0;i<10;i++){
        /* 3番目求める */
        if(hai[i]>temp3rd&&hai[i]<temp2nd)
       {temp3rd=hai[i];hai[i]=0;}
    }
     
    /* 表示 */
    printf("最も高い山の高さ　%d\n",tempmax);
    printf("２番目に高い山の高さ　%d\n",temp2nd);
    printf("３番目に高い山の高さ　%d\n",temp3rd);
     
    return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
int main(){
	int a[10];
	for(int i=0;i<10;i++)cin>>a[i];
	int t=90000;
	for(int i=t;i;i--){
		for(int j=i;j;j--){
			if(i+j==2)sort(a,a+10);
		}
	}
	for(int i=9;i>6;i--)cout<<a[i]<<endl;
	return 0;
}