Go: package main

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

var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := rdr.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}

func toInt(str string) int {
	n, _ := strconv.Atoi(str)
	return n
}

func main() {
	lst := make([]int, 0)
	for i := 0; i < 10; i++ {
		lst = append(lst, toInt(readLine()))
	}
	sort.Ints(lst)
	for i := 9; i > 6; i-- {
		fmt.Println(lst[i])
	}
}

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

using namespace std;

int main() {
    vector<int> h(10);
    for (size_t i=0; i<10; ++i)
        scanf("%d", &h[i]);

    sort(h.begin(), h.end(), greater<int>());
    for (size_t i=0; i<3; ++i)
        printf("%d\n", h[i]);

    return 0;
}

C++: #include <stdio.h>

int main(){
    
    int a,b,c,d,e,f,g,h,i,j;
    int n1,n2,n3;
    
    scanf("%d",&a);
    scanf("%d",&b);
    
    if(b > a){
        
        n1 = b
        n2 = a;
        
    }else{
        
        n1 = a;
        n2 = b;
        
    }
    
    scanf("%d",&c);
    
    if(c > n1){
        
        n2 = n1;
        n1 = c;
        
    }else if(c > n2){
        
        n3 = n2;
        n2 = c;
        
    }else{
        
        n3 = c;
        
    }
    
    scanf("%d",&d);
    
    if(d > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = d;
        
    }else if(d > n2){
        
        n3 = n2;
        n2 = d;
        
    }else if(d > n3){
        
        n3 = d;
        
    }
    
    scanf("%d",&e);
    
    if(e > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = e;
        
    }else if(e > n2){
        
        n3 = n2;
        n2 = e;
        
    }else if(e > n3){
        
        n3 = e;
        
    }
    
    scanf("%d",&f);
    
    if(f > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = f;
           
    }else if(f > n2){
        
        n3 = n2;
        n2 = f;
        
    }else if(f > n3){
        
        n3 = f;
        
    }
    
    scanf("%d",&g);
    
    if(g > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = g;
        
    }else if(g > n2){
        
        n3 = n2;
        n2 = g;
        
    }else if(g > n3){
        
        n3 = g;
        
    }
    
    scanf("%d",&h);
    
 if(h > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = h;
        
    }else if(h > n2){
        
        n3 = n2;
        n2 = h;
        
    }else if(h > n3){
        
        n3 = h;
        
    }


    scanf("%d",&i);
    
     if(i > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = i;
        
    }else if(i > n2){
        
        n3 = n2;
        n2 = i;
        
    }else if(i > n3){
        
        n3 = i;
        
    }
    
    
    scanf("%d",&j);
    
     if(j > n1){
        
        n3 = n2;
        n2 = n1;
        n1 = j;
        
    }else if(j > n2){
        
        n3 = n2;
        n2 = j;
        
    }else if(j > n3){
        
        n3 = j;
        
    }
    
    
    printf("%d\n",n1);
    printf("%d\n",n2);
    printf("%d\n",n3);
    

    return 0;   
}

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

int main(){

	int height[10];

	for(int i=0;i<10;i++){
		cout << i+1 << "番目の山の高さ：";
		cin >> height[i];
	}

	int sort[3]={0,0,0};
	int box;

	for(int i=0;i<10;i++){
		if(height[i]>sort[2]){
			sort[2]=height[i];
			if(sort[1]<sort[2]){
				box=sort[1];
				sort[1]=sort[2];
				sort[2]=box;
				if(sort[0]<sort[1]){
				box=sort[0];
				sort[0]=sort[1];
				sort[1]=box;
				}
			}
		}
	}

	for(int i=0;i<3;i++){
		cout << i+1 << "番目に高い山の高さ：" << sort[i] << endl;
	}

    return 0;
}

C++: #include <iostream>
#include <string>
#include <cctype>
using namespace std;
int main(){
    string line;
    for(;getline(cin,line);){
        for(int i=0;i<line.size();i++)line[i]=toupper(line[i]);
        cout<<line<<endl;
    }
}

C++: #include <stdio.h>

int main(void)
{
	int i, j, temp = 0, x[10];
	for (i = 0; i < 10; i++){
		//printf("山の高さ%d ", i + 1);
		scanf("%d", &x[i]);
	}
	for (i = 0; i < 10; i++){
		for (j = 9; j > i; j--){
			if (x[j] > x[j - 1]){
				temp = x[j - 1];
				x[j - 1] = x[j];
				x[j] = temp;
			}
		}
	}
	for (i = 0; i < 3; i++){
		printf("%d\n", x[i]);
	}
	
	return 0;
}

C++: #include<cstdio>
#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<string>
#define REP(i,n) for(long long int (i)=0;(i)<(n);i++)


using namespace std;


int main(){
  priority_queue<int,vector<int>,less<int>>Q;
  int n;
  REP(i,10){
    cin >> n;
    Q.push(n);
  }
  REP(i,3){ cout << Q.top()<<endl;Q.pop();
  }
  return 0;
}

C++: #include <iostream>
#include <queue>
#include <vector>
using namespace std;
 
int main()
{
    priority_queue< int,vector<int>,less<int> > que;
    int in;
 
    for(int i = 0; i < 10; i++){
        cin >> in;
        que.push(in);
    }
 
 
    for(int j = 0; j < 3; j++){
        cout << que.top() << '\n';
        que.pop();
    }
 
    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];
  }
  sort(a, a+ 9);
  printf("%d\n", a[9]);
  printf("%d\n", a[8]);
  printf("%d\n", a[7]);
}

C++: #include <iostream>

using namespace std;

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

  for (int i = 0; i < 3; i++) {
    int max = 0;
    for (int i = 0; i < 10; i++) {
      max = hill[i] > max ? hill[i] : max;
    }

    cout << max << endl;

    for (int i = 0; i < 10; i++) {
      hill[i] = hill[i] == max ? 0 : hill[i];
    }
  }

  return 0;
}

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

int main()
{
    int a[10] , i = 0;
	
    while (i < 10){
		cin>>a[i];
		i++;
    }
	
    reverse(a , a + 10);
	
	i = 0;
	
	while (i < 3){
		cout << a[i] << endl;
		i++;
	}
	
	return 0;
}

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

int main(){

int a[10];


for(int k=0;k<10;k++){
cin>>a[k]>>endl;
}

for(int i = 0; i < 10; i++){
for(int j = i + 1; j < 10; j++){
if(a[i] > a[j]){
dumy = a[i];
a[i] = a[j];
a[j] = dumy;
}
}
}



for(int k=0;k<10;k++){
cout<<a[0] <<a[1] <<a[2]<<endl;
}



return 0;
}

C++: #include<iostream>
using namespace std;
  
int main(){
    int i;
    int A[10];
    for(i = 0; i < 10; i++){
        cin >> A[i];
    }
    int a = -1, b = -1, c = -1;
    for(i = 0; i < 10; i++){
		if(A[i] >= a){ c = b, b = a, a = A[i]; }
		else if(A[i] >= b){ c = b, b = A[i]; }
		else if(A[i] >= c){ c = A[i]; }
    }
    cout << a << endl;
    cout << b << endl;
    cout << c << endl;
    return 0;
}

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

int main(){
     int a[10],i,judge;
     for(i=0;i<10;i++) cin >> a[i];
     judge = 0;
     do{
       judge = 1;
       for(i=0;i<10;i++){
         if(a[i]<a[i+1]){
           swap(a[i],a[i+1]);
           judge = 0;
         }
       }
     }while(!judge);

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

   return 0;
}

C++: #include <stdio.h>

int height[10];

int main(){
  for(int i = 0; i < 10; i++){
    scanf("%d", &height[i]);
  }
  for(int numb = 0; numb < 9; numb++){
        for(int num = 0; num < 9-numb; num++){
            if(height[num] < height[num+1]){
                int stock = height[num];
                height[num] = height[num+1];
                height[num+1] = stock;
                printf("processing:%d\n", num);
            }
            printf("array[%d]:%d\n, array[%d]:%d\n",num,height[num], num+1, height[num+1]);
        }
    }
  for(int a = 0; a < 3; a++){
    printf("Height%d: %d\n", a, height[a]); 
  }
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
 
int main(){
	ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	int a[11];
	for(int i=0;i<10;i++){
		cin>>a[i];
	}
	sort(a,a+10);
	cout<<a[9]<<endl<<a[8]<<endl<<a[7];
    return 0;
}