Go: package main

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

func main() {
	mountHeightList := make([]int64, 10)
	scanner := bufio.NewScanner(os.Stdin)
	for i := 0; i < 10; i++ {
		scanner.Scan()
		mountHeightList[i], _ = strconv.ParseInt(scanner.Text(), 10, 64)
	}

	sort.Slice(mountHeightList, func(i, j int) bool { return mountHeightList[i] > mountHeightList[j] })

	for i := 0; i < 3; i++ {
		fmt.Printf("%d\n", mountHeightList[i])
	}
}

C++: #include <iostream>

using namespace std;

int main()
{
    long n,a=0,b=0,c=0;

    for(int i=1; i<=10;  i++){
        cin>>n;
        if(n>a){
            c=b;
            b=a;
            a=n;
        }
        else if(n>b){
            c=b;
            b=n;
        }
        else if(n>c){
            c=n;
        }
    }
    cout<<a<<endl<<b<<endl<<c;
    return 0;
}

C++: #include<stdio.h>
int main(){
  int data[10];
  int temp;
  int i,j;
  for(i=0;i<10;i++){
    scanf("%d",&data[i]);
  }
  for(i=0;i<3;i++){
    for(j=0;j<9-i;j++){
      if(data[j]>data[j+1]){
	temp=data[j];
	data[j]=data[j+1];
	data[j+1]=temp;
      }
    }
    printf("%d\n",data[j]);
  }
  return 0;
}

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

int main(){
	int height[10];
    for (int i = 0; i < 10; i++)
		cin >> height[i];
	sort(height, height + 10);
	cout << height[7] << '\n';
	cout << height[8] << '\n';
	cout << height[9] << '\n';
    return 0;
}

C++: #include<iostream>
#include<stdio.h>
#include<algorithm>
using namespace std;
int main()
{
	int m[10];
   for(int i=0;i<10;++i)
   {
	   cin>>m[i];
   }
   sort(&m[0],&m[9]+1);
   cout<<m[8]<<endl<<m[9]<<endl<<m[7]<<endl;

   return 0;
}

C++: // Header {{{
// includes {{{
#include <algorithm>
#include <cassert>
#include <cctype>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <iostream>
#include <iterator>
#include <limits>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <sys/time.h>
#include <unistd.h>
#include <vector>
// }}}
using namespace std;
// consts {{{
static const int INF = 1e9;
static const double PI = acos(-1.0);
static const double EPS = 1e-10;
// }}}
// typedefs {{{
typedef long long int LL;
typedef unsigned long long int ULL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
typedef vector<ULL> VULL;
typedef vector<VULL> VVULL;
typedef vector<double> VD;
typedef vector<VD> VVD;
typedef vector<bool> VB;
typedef vector<VB> VVB;
typedef vector<char> VC;
typedef vector<VC> VVC;
typedef vector<string> VS;
typedef vector<VS> VVS;
typedef pair<int, int> PII;
typedef complex<int> P;
// }}}
// macros & inline functions {{{
// syntax sugars {{{
#define FOR(i, b, e) for (typeof(e) i = (b); i < (e); ++i)
#define FORI(i, b, e) for (typeof(e) i = (b); i <= (e); ++i)
#define REP(i, n) FOR(i, 0, n)
#define REPI(i, n) FORI(i, 0, n)
#define OPOVER(_op, _type) inline bool operator _op (const _type &t) const
// }}}
// 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(); }
// }}}
// array and STL {{{
#define ARRSIZE(a) ( sizeof(a) / sizeof(a[0]) )
#define ZERO(a, v) ( assert(v == 0 || v == -1), memset(a, v, sizeof(a)) )
#define F first
#define S second
#define MP(a, b) make_pair(a, b)
#define SIZE(a) ((LL)a.size())
#define PB(e) push_back(e)
#define SORT(v) sort((v).begin(), (v).end())
#define RSORT(v) sort((v).rbegin(), (v).rend())
#define ALL(a) (a).begin(), (a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define EACH(c, it) for(typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define EXIST(s, e) ((s).find(e) != (s).end())
// }}}
// bit manipulation {{{
// singed integers are not for bitwise operations, specifically arithmetic shifts ('>>', and maybe not good for '<<' too)
#define IS_UNSIGNED(n) (!numeric_limits<typeof(n)>::is_signed)
#define BIT(n) (assert(IS_UNSIGNED(n)), assert(n < 64), (1ULL << (n)))
#define BITOF(n, m) (assert(IS_UNSIGNED(n)), assert(m < 64), ((ULL)(n) >> (m) & 1))
inline int make_mask(ULL upper, ULL lower) { assert(lower < 64 && upper < 64 && lower <= upper); return (BIT(upper) - 1) ^ (BIT(lower) - 1); }
inline int onbits_count(ULL b) { int c = 0; while(b != 0) { c += (b & 1); b >>= 1; } return c; }
inline int bits_count(ULL b) { int c = 0; while(b != 0) { ++c; b >>= 1; } return c; }
// }}}
// for readable code {{{
#define EVEN(n) (n % 2 == 0)
#define ODD(n) (!EVEN(n))
// }}}
// debug {{{
#define dprt(fmt, ...) if (opt_debug) fprintf(stderr, fmt, ##__VA_ARGS__)
#define darr(a) if (opt_debug) copy( (a), (a) + arrsz(a), ostream_iterator<int>(cerr, " ") ); cerr << endl
#define darr_range(a, f, t) if (opt_debug) copy( (a) + (f), (a) + (t), ostream_iterator<int>(cerr, " ") ); cerr << endl
#define dvec(v) if (opt_debug) copy( ALL(v), ostream_iterator<int>(cerr, " ") ); cerr << endl
#define darr2(a, n, m) if (opt_debug) FOR(__i, 0, (n)){ darr_range( (a)[__i], 0, (m) ); }
#define dvec2(v) if (opt_debug) FOR(__i, 0, v.size()){ dvec( (v)[__i] ); }
#define WAIT() if (opt_debug) { string _wait_; cerr << "(hit return to continue)" << endl; getline(cin, _wait_); }
#define dump(x) if (opt_debug) cerr << " [L" << __LINE__ << "] " << #x << " = " << (x) << endl;
#define dumpf() if (opt_debug) cerr << __PRETTY_FUNCTION__ << endl;
#define dumpv(x) if (opt_debug) cerr << " [L:" << __LINE__ << "] " << #x << " = "; REP(q, (x).size()) cerr << (x)[q] << " "; cerr << endl;
#define where() if (opt_debug) cerr << __FILE__ << ": " << __PRETTY_FUNCTION__ << " [L: " << __LINE__ << "]" << endl;
#define show_bits(b, s) if(opt_debug) { REP(i, s) { cerr << BITOF(b, s-1-i); if(i%4 == 3) cerr << ' '; } cerr << endl; }
template<typename T1, typename T2> ostream& operator<<(ostream& s, const pair<T1, T2>& d) {return s << "(" << d.first << ", " << d.second << ")";}
// }}}
// }}}
// time {{{
inline double now(){ struct timeval tv; gettimeofday(&tv, NULL); return (static_cast<double>(tv.tv_sec) + static_cast<double>(tv.tv_usec) * 1e-6); }
// }}}
// string manipulation {{{
inline VS split(string s, char delimiter) { VS v; string t; REP(i, s.length()) { if(s[i] == delimiter) v.PB(t), t = ""; else t += s[i]; } v.PB(t); return v; }
// }}}
// geometry {{{
#define Y real()
#define X imag()
// }}}
// 2 dimentional array {{{
P dydx4[4] = { P(-1, 0), P(0, 1), P(1, 0), P(0, -1) };
P dydx8[8] = { P(-1, 0), P(0, 1), P(1, 0), P(0, -1), P(-1, 1), P(1, 1), P(1, -1), P(-1, -1) };
int g_height, g_width;
bool in_field(P p) {
	return (0 <= p.Y && p.Y < g_height) && (0 <= p.X && p.X < g_width);
}
// }}}
// }}}
bool opt_debug = false;

int main(int argc, char** argv) {
	std::ios_base::sync_with_stdio(false);
	// set options {{{
	int __c;
	while ( (__c = getopt(argc, argv, "d")) != -1 ) {
		switch (__c) {
			case 'd':
				opt_debug = true;
				break;
			default:
				abort();
		}
	}
	// }}}

	vector<int> mountains(10);
	REP (i, 10) {
		cin >> mountains[i];
	}
	sort(mountains.rbegin(), mountains.rend());
	REP (i, 3) {
		cout << mountains[i] << endl;
	}
}

// vim: foldmethod=marker

C++: #include <stdio.h>

int main(void){
  int yama[10];
 
  //山の値を１０個入力する
  for(int i = 0; i < 10; i++){
    scanf("%d", &yama[i]);
  }

  //ソートする
  for(int i = 0; i < 9; i++){
    for(int j = 0; j < 9; j++){
      if(yama[j] < yama[j+1]){
	int a = yama[j+1];
	yama[j+1] = yama[j];
	yama[j] = a;
      }
    }
  }

  //値を出力
  for(int i = 0; i < 3; i++){
    printf("%d\n", yama[i]);
  }

  return 0;


}

C++: #include<iostream>
#include<string>
#include<cmath>
#include<algorithm>
using namespace std; 
int main(){
  int a[10]={};  
  for(int i=1;i<=10;i++){
    cin>>a[i];
  }
 
  sort(a,a+10);
    cout<<a[9]<<endl;
  cout<<a[8]<<endl;
  cout<<a[7]<<endl;

  return 0;
}