criyle/codenet-compile-errors huggingface dataset:
Language: C

/*mennseki*/
#include<stdio.h>
int main(void)
{
  int r,x;
  scanf("%d",&r);
  x=1;
  if(x*x*3.14<=r*r*3.14){
    printf("%d\n",r*r);
  }
  else{
    printf("%d\n",x);
  }
  returnf 0;
}

Compiler output:
main.c: In function 'main':
main.c:14:3: error: 'returnf' undeclared (first use in this function)
   14 |   returnf 0;
      |   ^~~~~~~
main.c:14:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:14:10: error: expected ';' before numeric constant
   14 |   returnf 0;
      |          ^~
      |          ;
Language: C

#include <stdio.h>

int main(void)
{
  int r;
  scanf("%d",$r);
  printf("%d",r^2);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:14: error: '$r' undeclared (first use in this function); did you mean 'r'?
    6 |   scanf("%d",$r);
      |              ^~
      |              r
main.c:6:14: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

using namespace std;

int main() {
  int r;
  cin >> r;
 
  cout << r * r;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin >> r;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:7:3: error: 'cout' was not declared in this scope
    7 |   cout << r * r;
      |   ^~~~
a.cc:7:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C

#include <stdio.h>

void main()
{
  	int r;
	scanf("%d",&r);
  	printf("%d\n",r*r)
}

Compiler output:
main.c: In function 'main':
main.c:7:27: error: expected ';' before '}' token
    7 |         printf("%d\n",r*r)
      |                           ^
      |                           ;
    8 | }
      | ~
Language: C++

using System;

namespace ABC145A
{
    class Program
    {
        static void Main(string[] args)
        {
            var r = int.Parse(Console.ReadLine());
            Console.WriteLine(r * r);
        }
    }
}

Compiler output:
a.cc:1:7: error: expected nested-name-specifier before 'System'
    1 | using System;
      |       ^~~~~~
a.cc:7:26: error: 'string' has not been declared
    7 |         static void Main(string[] args)
      |                          ^~~~~~
a.cc:7:35: error: expected ',' or '...' before 'args'
    7 |         static void Main(string[] args)
      |                                   ^~~~
a.cc:12:6: error: expected ';' after class definition
   12 |     }
      |      ^
      |      ;
a.cc: In static member function 'static void ABC145A::Program::Main(int*)':
a.cc:9:13: error: 'var' was not declared in this scope
    9 |             var r = int.Parse(Console.ReadLine());
      |             ^~~
a.cc:10:13: error: 'Console' was not declared in this scope
   10 |             Console.WriteLine(r * r);
      |             ^~~~~~~
a.cc:10:31: error: 'r' was not declared in this scope
   10 |             Console.WriteLine(r * r);
      |                               ^
Language: C

#include <stdio.h>

void main()
{
	int　r,a;
	scanf("%d", &r);
	a=r*r;
    printf("%d", a);
}


Compiler output:
main.c: In function 'main':
main.c:5:12: error: stray '\343' in program
    5 |         int<U+3000>r,a;
      |            ^~~~~~~~
Language: C

#include<stdio.h>
 
int main (){
 
	int r;
 
	scanf("%d",r);
	r = r * r;
 
	printf("%d",&r)
 
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:24: error: expected ';' before 'return'
   10 |         printf("%d",&r)
      |                        ^
      |                        ;
   11 | 
   12 |         return 0;
      |         ~~~~~~
Language: C

#include <stdio.h>
#include <math.h>
void main()
{
	int　r,a;
	scanf("%d", &r);
	a=pow(r,2);
    printf("%d", a);
}


Compiler output:
main.c: In function 'main':
main.c:5:12: error: stray '\343' in program
    5 |         int<U+3000>r,a;
      |            ^~~~~~~~
Language: C

#include<stdio.h>
int main (){
	int r=0;
	scanf("%d",&r);
	r = r * r;
 
	printf("%d",r)
 
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:23: error: expected ';' before 'return'
    7 |         printf("%d",r)
      |                       ^
      |                       ;
    8 | 
    9 |         return 0;
      |         ~~~~~~
Language: C++

#include <iostream>
using namespace std;
int main(void)
{
  int r;
  cin >> r 
    int s;
  cout << r * r << endl;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: expected ';' before 'int'
    6 |   cin >> r
      |           ^
      |           ;
    7 |     int s;
      |     ~~~
Language: C

#include <stdio.h>
#include <math.h>

void main()
{
	int　r;
	scanf("%d", &r);
	r=pow(r,2);
    printf("%d", r);
}


Compiler output:
main.c: In function 'main':
main.c:6:12: error: stray '\343' in program
    6 |         int<U+3000>r;
      |            ^~~~~~~~
Language: Java

int r;
float s1;
float s2;

s1 = 1^2 * 3.14;
s2 = r^2 * 3.14;

println = (s2 / s1);




Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
int r;
^
  (use --enable-preview to enable unnamed classes)
Main.java:5: error: class, interface, enum, or record expected
s1 = 1^2 * 3.14;
^
Main.java:6: error: class, interface, enum, or record expected
s2 = r^2 * 3.14;
^
Main.java:8: error: class, interface, enum, or record expected
println = (s2 / s1);
^
4 errors
Language: C++

#include"stdio.h"
#include"iostream"
#include"string"
using namespace std;
int main(void){
	int a;
  	int flg = 0;
    cin >> a;
	string b;
	cin >> b;
	string c = b.substr(a/2,a/2)
	if(b.strcmp(0,a/2,a)==0){
    	flg ==0;
    }else{
    	flg ==1;
    }
	if(flg==0){
    	cout << "No";
    }else{
    	cout << "Yes";
    }
  

}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: expected ',' or ';' before 'if'
   12 |         if(b.strcmp(0,a/2,a)==0){
      |         ^~
a.cc:14:6: error: 'else' without a previous 'if'
   14 |     }else{
      |      ^~~~
Language: C

#include <stdio.h>
#include <math.h>

void main()
{
	int　r;
    scanf("%d", &r);
    r=pow(r,2);
    printf("%d", r);
}


Compiler output:
main.c: In function 'main':
main.c:6:12: error: stray '\343' in program
    6 |         int<U+3000>r;
      |            ^~~~~~~~
Language: C

#include <stdio.h>
#include <math.h>

void main()
{
	int　r, a;
    scanf("%d", &r);
    a=pow(r,2);
    printf("%d", a);
}


Compiler output:
main.c: In function 'main':
main.c:6:12: error: stray '\343' in program
    6 |         int<U+3000>r, a;
      |            ^~~~~~~~
Language: C

#include<stdio.h>
 
int main (void){
 
	int r;
 
	scanf("%d",&r);
	r = r * r;
 
	printf("%d",r)
 
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:23: error: expected ';' before 'return'
   10 |         printf("%d",r)
      |                       ^
      |                       ;
   11 | 
   12 |         return 0;
      |         ~~~~~~
Language: C

#include<stdio.h>
#include<stdlib.h>

int main(){
      
       int a;
       scanf(”%d”,&a);
       printf(”%d\n”,(a*a));

       return(0);

}

Compiler output:
main.c: In function 'main':
main.c:7:14: error: stray '\342' in program
    7 |        scanf(<U+201D>%d<U+201D>,&a);
      |              ^~~~~~~~
main.c:7:15: error: expected expression before '%' token
    7 |        scanf(”%d”,&a);
      |               ^
main.c:7:17: error: stray '\342' in program
    7 |        scanf(<U+201D>%d<U+201D>,&a);
      |                        ^~~~~~~~
main.c:8:15: error: stray '\342' in program
    8 |        printf(<U+201D>%d\n<U+201D>,(a*a));
      |               ^~~~~~~~
main.c:8:16: error: expected expression before '%' token
    8 |        printf(”%d\n”,(a*a));
      |                ^
main.c:8:18: error: stray '\' in program
    8 |        printf(”%d\n”,(a*a));
      |                  ^
main.c:8:20: error: stray '\342' in program
    8 |        printf(<U+201D>%d\n<U+201D>,(a*a));
      |                           ^~~~~~~~
Language: C

#include<stdio.h>
 
int main void(){
 
	int r;
 
	scanf("%d",&r);
	r = r * r;
 
	printf("%d",r)
 
	return 0;
}

Compiler output:
main.c:3:9: error: expected ';' before 'void'
    3 | int main void(){
      |         ^~~~~
      |         ;
main.c:3:15: error: expected identifier or '(' before ')' token
    3 | int main void(){
      |               ^
Language: C++

#include <stdio.h>
#include <math.h>

int main (){
  int r;
  scanf("%d", &r);
  printf("%d", (3*pow(r, 2))/3);
  return;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: return-statement with no value, in function returning 'int' [-fpermissive]
    8 |   return;
      |   ^~~~~~
Language: C

#include <stdio.h>
#include <math.h>

int main()
{
	int　r, a;
    scanf("%d", &r);
    a=pow(r,2);
    printf("%d", a);
}


Compiler output:
main.c: In function 'main':
main.c:6:12: error: stray '\343' in program
    6 |         int<U+3000>r, a;
      |            ^~~~~~~~
Language: C++

#include <iostream>

int main(){
    int r;std::cin >> r;

    cout << r * r << "¥n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |     cout << r * r << "¥n";
      |     ^~~~
      |     std::cout
In file included from a.cc:1:
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#pragma GCC optimize("Ofast")   //Comment optimisations for an interatcive problem - use endl
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
#include<bits/stdc++.h>

using namespace std;

#define  fastio         ios:: sync_with_stdio(0);cin.tie(0);cout.tie(0);cout<<fixed;cout<<setprecision(10);
#define  randomINIT     mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
#define  foo(i,a,n)     for(ll i = (a); i <= n; i++)
#define  frr(i,a,n)     for(ll i = (a); i >= n; i--)
#define  fo(i,n)        for(ll i = 0; i < n; i++)
#define  all(x)         (x).begin(),(x).end()
#define  mset(x,val)    memset(x,val,sizeof(x))
#define  newl           cout<<"\n"
#define  pb             push_back
#define  mp             make_pair
#define  s              second
#define  f              first
#define  dline          cout<<"///REACHED///\n";
#define  deb1(x)        cout<<#x<<" = "<<x<<'\n';
#define  deb2(x,y)      cout<<'['<<#x<<','<<#y<<"] = "<<'['<<x<<','<<y<<']'<<'\n';
#define  deb3(x,y,z)    cout<<'['<<#x<<','<<#y<<','<<#z<<"] = "<<'['<<x<<','<<y<<','<<z<<']'<<'\n';

typedef  long long             ll;
typedef  long double           ld;
typedef  pair<ll,ll>           pll;
typedef  vector<ll>            vll;
typedef  unordered_map<ll,ll>  um;
typedef  vector<pll>           vpll;

const ll   MOD   =  1e+9+7;
const ll   INF   =  0x7f7f7f7f7f7f7f7f;
const int  INFi  =  0x7f7f7f7f;
const ll   MAXN  =  1e+5+7;

vll adj[MAXN];ll visit[MAXN]={};
int dx8[]={0,1,1,1,0,-1,-1,-1}, dy8[]={1,1,0,-1,-1,-1,0,1};
int dx4[]={0,1,0,-1}, dy4[]={1,0,-1,0};

//<<-----Declare Variable Here------->>//
int qq;

//<<-----Implement Functions Here---->>//


//<<-----Start of Main--------------->>//

int main(){
	fastio;randomINIT;

	cin>>r;
	cout<<r*r;

    #ifndef ONLINE_JUDGE
    cout<<"\nTime Elapsed: " << 1.0*clock() / CLOCKS_PER_SEC << " sec\n";
    #endif
}

Compiler output:
a.cc: In function 'int main()':
a.cc:52:14: error: 'r' was not declared in this scope
   52 |         cin>>r;
      |              ^
Language: C++

#include<iostream>
#include<vector>
#include<string>
using namespace std;
int main{
int a;
cin >> a;
cout << a*a << endl;
}

Compiler output:
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main{
      |     ^~~~
a.cc:6:1: error: expected primary-expression before 'int'
    6 | int a;
      | ^~~
a.cc:6:1: error: expected '}' before 'int'
a.cc:5:9: note: to match this '{'
    5 | int main{
      |         ^
a.cc:7:1: error: 'cin' does not name a type
    7 | cin >> a;
      | ^~~
a.cc:8:1: error: 'cout' does not name a type
    8 | cout << a*a << endl;
      | ^~~~
a.cc:9:1: error: expected declaration before '}' token
    9 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int r;
    cin>>r;
    cout<r*r<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
    7 |     cout<r*r<<endl;
      |          ~~~^~~~~~
Language: C

#include<stdio.h>

int main(){

    int r=0;
    scanf("%d",&r);
    r=r*r;
    printf("%d\n",r;

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:20: error: expected ')' before ';' token
    8 |     printf("%d\n",r;
      |           ~        ^
      |                    )
main.c:10:14: error: expected ';' before '}' token
   10 |     return 0;
      |              ^
      |              ;
   11 | }
      | ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
int main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	int n
	cin>>n;
	cout<<n*n;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: expected initializer before 'cin'
    9 |         cin>>n;
      |         ^~~
a.cc:10:15: error: 'n' was not declared in this scope; did you mean 'yn'?
   10 |         cout<<n*n;
      |               ^
      |               yn
Language: Java


import java.util.Scanner;

public class Solution{
	public static int Square(int a){
		int ans = (int) Math.pow(a,2);
		return ans;	
		}
	
	public static void main(String[] args) {
		
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		System.out.println(Square(a));
		}
	
	}


Compiler output:
Main.java:4: error: class Solution is public, should be declared in a file named Solution.java
public class Solution{
       ^
1 error
Language: C

#include <stdio.h>
#include <math.h>

int main()
{
	int　r,a;
    scanf("%d", &a);
    a=pow(r,2);
    printf("%d", a);
}


Compiler output:
main.c: In function 'main':
main.c:6:12: error: stray '\343' in program
    6 |         int<U+3000>r,a;
      |            ^~~~~~~~
Language: C++

import java.util.*;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int r = sc.nextInt();
    System.out.println(r*r);
  }

}


Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.util.*;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:3:1: error: expected unqualified-id before 'public'
    3 | public class Main {
      | ^~~~~~
Language: C

#include<stdio.h>
#include<stdlib.h>

int main()
{
	int a;
	scanf(“%d”, &a);

	printf(“%d\n”,(a*a));

	return(0);

}

Compiler output:
main.c: In function 'main':
main.c:7:15: error: stray '\342' in program
    7 |         scanf(<U+201C>%d<U+201D>, &a);
      |               ^~~~~~~~
main.c:7:16: error: expected expression before '%' token
    7 |         scanf(“%d”, &a);
      |                ^
main.c:7:18: error: stray '\342' in program
    7 |         scanf(<U+201C>%d<U+201D>, &a);
      |                         ^~~~~~~~
main.c:9:16: error: stray '\342' in program
    9 |         printf(<U+201C>%d\n<U+201D>,(a*a));
      |                ^~~~~~~~
main.c:9:17: error: expected expression before '%' token
    9 |         printf(“%d\n”,(a*a));
      |                 ^
main.c:9:19: error: stray '\' in program
    9 |         printf(“%d\n”,(a*a));
      |                   ^
main.c:9:21: error: stray '\342' in program
    9 |         printf(<U+201C>%d\n<U+201D>,(a*a));
      |                            ^~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {

	int n:
	cin >> n;
	cout << n*n;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: found ':' in nested-name-specifier, expected '::'
    6 |         int n:
      |              ^
      |              ::
a.cc:6:13: error: 'n' has not been declared
    6 |         int n:
      |             ^
a.cc:7:13: error: qualified-id in declaration before '>>' token
    7 |         cin >> n;
      |             ^~
a.cc:8:17: error: 'n' was not declared in this scope; did you mean 'yn'?
    8 |         cout << n*n;
      |                 ^
      |                 yn
Language: C++

#include<stdio.h>
using namespace std;
int main( void )
{
	int r;
  	cin >> r;
  	cout << r*r;
 
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin >> r;
      |         ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include<stdio.h>
  +++ |+#include <iostream>
    2 | using namespace std;
a.cc:7:9: error: 'cout' was not declared in this scope
    7 |         cout << r*r;
      |         ^~~~
a.cc:7:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include<bits/stdc++.h>
using namespace std;
int mian()
{
  int n;
  cin>>n;
  cout<<n*n;
  return 0;
}


Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C

#include <stdio.h>
#include <math.h>

int main()
{
	int　a=0;
    scanf("%d", &a);
    a=pow(a,2);
    printf("%d", 'a');
}


Compiler output:
main.c: In function 'main':
main.c:6:12: error: stray '\343' in program
    6 |         int<U+3000>a=0;
      |            ^~~~~~~~
Language: Java


import java.util.Scanner;

public class Solution{
	public static int Square(int a){
		int ans = (int) Math.pow(a,2);
		return ans;	
		}
	
	public static void main(String[] args) {
		
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		System.out.println(Square(a));
		}
	
	}

Compiler output:
Main.java:4: error: class Solution is public, should be declared in a file named Solution.java
public class Solution{
       ^
1 error
Language: C

#include<stdio.h>
#include<stdlib.h>

int main()
{
	int a;
	scanf(“%d”, &a);

	printf(“%d\n”,a*a);

	return(0);

}

Compiler output:
main.c: In function 'main':
main.c:7:15: error: stray '\342' in program
    7 |         scanf(<U+201C>%d<U+201D>, &a);
      |               ^~~~~~~~
main.c:7:16: error: expected expression before '%' token
    7 |         scanf(“%d”, &a);
      |                ^
main.c:7:18: error: stray '\342' in program
    7 |         scanf(<U+201C>%d<U+201D>, &a);
      |                         ^~~~~~~~
main.c:9:16: error: stray '\342' in program
    9 |         printf(<U+201C>%d\n<U+201D>,a*a);
      |                ^~~~~~~~
main.c:9:17: error: expected expression before '%' token
    9 |         printf(“%d\n”,a*a);
      |                 ^
main.c:9:19: error: stray '\' in program
    9 |         printf(“%d\n”,a*a);
      |                   ^
main.c:9:21: error: stray '\342' in program
    9 |         printf(<U+201C>%d\n<U+201D>,a*a);
      |                            ^~~~~~~~
Language: Java

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int r = sc.nextInt();
		double pi = 3.14159265359;
		
		double a = r * r * pi;
		System.out.println((int)Math.floor(a/pi));

	}


Compiler output:
Main.java:13: error: reached end of file while parsing
	}
	 ^
1 error
Language: C++

#include<iostream>
using namespace std;

int main(void)
{
	int r;
  	int rr;
	cin >> r;
  rr = r ** 2
	cout << rr;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: invalid type argument of unary '*' (have 'int')
    9 |   rr = r ** 2
      |           ^~~
Language: C++

#include<stdio.h>

int main( void )
{
	int r;
  	cin >> r;
  	cout << r*r;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin >> r;
      |         ^~~
a.cc:7:9: error: 'cout' was not declared in this scope
    7 |         cout << r*r;
      |         ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n; scanf("%d", &n);
    printf("%d\n", r * r);
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:20: error: 'r' was not declared in this scope
    6 |     printf("%d\n", r * r);
      |                    ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
	cin>>n;
	cout<<n*n<<endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:14: error: 'n' was not declared in this scope; did you mean 'yn'?
    5 |         cin>>n;
      |              ^
      |              yn
Language: C

#include<stdio.h>

int main void(){

	int r;

	scanf(d,&r);
	r = r * r;

	printf("%d",r)

	return 0;
}

Compiler output:
main.c:3:9: error: expected ';' before 'void'
    3 | int main void(){
      |         ^~~~~
      |         ;
main.c:3:15: error: expected identifier or '(' before ')' token
    3 | int main void(){
      |               ^
Language: Java

package ABC145;
import java.util.Scanner;
public class A {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int r = sc.nextInt();
		int a = r*r;
		System.out.println(a);	
	}

}


Compiler output:
Main.java:3: error: class A is public, should be declared in a file named A.java
public class A {
       ^
1 error
Language: C++

#include<iostream>
using namespace std;

int main(void)
{
	int r;
	cin >> r;
	cout << r ** 2;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:20: error: invalid type argument of unary '*' (have 'int')
    8 |         cout << r ** 2;
      |                    ^~~
Language: C++

#include <iostream>       
using namespace std;         

int main(){
  int r;
  cin >> r;
  cout << r*r << endl;
}    
  

                 
                             
       

Compiler output:
a.cc:11:1: error: extended character   is not valid in an identifier
   11 |  
      | ^
a.cc:11:1: error: '\U000000a0' does not name a type
   11 |  
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main
{
int a;
cin>>a;
cout<<a*a;
}

Compiler output:
a.cc:3:5: error: cannot declare '::main' to be a global variable
    3 | int main
      |     ^~~~
a.cc:5:1: error: expected primary-expression before 'int'
    5 | int a;
      | ^~~
a.cc:5:1: error: expected '}' before 'int'
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
a.cc:6:1: error: 'cin' does not name a type
    6 | cin>>a;
      | ^~~
a.cc:7:1: error: 'cout' does not name a type
    7 | cout<<a*a;
      | ^~~~
a.cc:8:1: error: expected declaration before '}' token
    8 | }
      | ^
Language: C

#include<stdio.h>

int main()
{
	int a;
	scanf(“%d”, &a);

	printf(“%d\n”,a*a);

	return(0);

}

Compiler output:
main.c: In function 'main':
main.c:6:15: error: stray '\342' in program
    6 |         scanf(<U+201C>%d<U+201D>, &a);
      |               ^~~~~~~~
main.c:6:16: error: expected expression before '%' token
    6 |         scanf(“%d”, &a);
      |                ^
main.c:6:18: error: stray '\342' in program
    6 |         scanf(<U+201C>%d<U+201D>, &a);
      |                         ^~~~~~~~
main.c:8:16: error: stray '\342' in program
    8 |         printf(<U+201C>%d\n<U+201D>,a*a);
      |                ^~~~~~~~
main.c:8:17: error: expected expression before '%' token
    8 |         printf(“%d\n”,a*a);
      |                 ^
main.c:8:19: error: stray '\' in program
    8 |         printf(“%d\n”,a*a);
      |                   ^
main.c:8:21: error: stray '\342' in program
    8 |         printf(<U+201C>%d\n<U+201D>,a*a);
      |                            ^~~~~~~~
Language: C

#include<stdio.h>
main()
{
	int a;
	scanf(“%d”, &a);

	printf(“%d\n”,a*a);

	return(0);

}

Compiler output:
main.c:2:1: error: return type defaults to 'int' [-Wimplicit-int]
    2 | main()
      | ^~~~
main.c: In function 'main':
main.c:5:15: error: stray '\342' in program
    5 |         scanf(<U+201C>%d<U+201D>, &a);
      |               ^~~~~~~~
main.c:5:16: error: expected expression before '%' token
    5 |         scanf(“%d”, &a);
      |                ^
main.c:5:18: error: stray '\342' in program
    5 |         scanf(<U+201C>%d<U+201D>, &a);
      |                         ^~~~~~~~
main.c:7:16: error: stray '\342' in program
    7 |         printf(<U+201C>%d\n<U+201D>,a*a);
      |                ^~~~~~~~
main.c:7:17: error: expected expression before '%' token
    7 |         printf(“%d\n”,a*a);
      |                 ^
main.c:7:19: error: stray '\' in program
    7 |         printf(“%d\n”,a*a);
      |                   ^
main.c:7:21: error: stray '\342' in program
    7 |         printf(<U+201C>%d\n<U+201D>,a*a);
      |                            ^~~~~~~~
Language: C++

int main(void) {

    int r;
    
    cin >> r;
    
    psn(r * r);

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:5: error: 'cin' was not declared in this scope
    5 |     cin >> r;
      |     ^~~
a.cc:7:5: error: 'psn' was not declared in this scope
    7 |     psn(r * r);
      |     ^~~
Language: Java

import java.util.*;
public class A {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int r = sc.nextInt();
		int answer= (int)Math.pow(r, 2);
		
		System.out.println(answer);
	

	}

}


Compiler output:
Main.java:2: error: class A is public, should be declared in a file named A.java
public class A {
       ^
1 error
Language: C

#include <stdio.h>
#include <math.h

int main(void)
{
	int r, a;
    scanf("%d", &r);
    a=pow(r,2);
    printf("%d", &a);
}


Compiler output:
main.c:2:17: error: missing terminating > character
    2 | #include <math.h
      |                 ^
Language: C

#include <iostream>
#include <cstdlib>

using namespace std;

int main(int arvg, char** argc){
	int r = atoi(argc[1]);
	cout << r*r;
	return 0;
}

	

Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: Java

class Main;
import java.util.Scanner;
public class A145 {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int r = scan.nextInt();
		scan.close();
		System.out.println((int)Math.pow(r,2));
	}
}


Compiler output:
Main.java:1: error: '{' expected
class Main;
          ^
Main.java:2: error: class, interface, enum, or record expected
import java.util.Scanner;
^
2 errors
Language: C++

#include<bits/stdc++.h>
using namespace std;
int mian()
{
  int n;
  cin>>n;
  cout<<n*n;
}

Compiler output:
a.cc: In function 'int mian()':
a.cc:8:1: warning: no return statement in function returning non-void [-Wreturn-type]
    8 | }
      | ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: Java

import java.util.*;

public class Test2 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long a = sc.nextInt();
		System.out.println(a*a);

	}

}


Compiler output:
Main.java:3: error: class Test2 is public, should be declared in a file named Test2.java
public class Test2 {
       ^
1 error
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <queue>
#include "study.h"
int a(void);
int b(void);
int main(void) {
	a();
	return 0;
}

int a(void) {
	int N;
	std::cin >> N;
	int res = N * N;
	std::cout << res;
	return 0;
}



Compiler output:
a.cc:6:10: fatal error: study.h: No such file or directory
    6 | #include "study.h"
      |          ^~~~~~~~~
compilation terminated.
Language: C++

#include<stdio.h>

int main(void)
{
  int r;
  scanf("%d",&r);
  printf("%d",r ** 2);
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:18: error: invalid type argument of unary '*' (have 'int')
    7 |   printf("%d",r ** 2);
      |                  ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main() {
  int r;
  cin >> r;
  cout << r ** 2
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: invalid type argument of unary '*' (have 'int')
    6 |   cout << r ** 2
      |              ^~~
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <queue>
#include "study.h"
int a(void);
int b(void);
int main(void) {
	a();
	return 0;
}

int a(void) {
	int N;
	std::cin >> N;
	int res = N * N;
	std::cout << res;
	return 0;
}

int b(void) {
	int N;
	std::vector<int> D;
	std::cin >> N;
	int temp;
	for (int i = 0; i < N; i++) {
		std::cin >> temp;
		D.push_back(temp);
	}
	std::sort(D.begin(), D.end());
	long long int result;
	int count, prev_count;
	result = 1;
	int temp_val = 0;
	int i = 0;
	int n = 0;
	
	while (temp_val <= D.back()) {
		count = 0;
		for (int j = n; D[j] == temp_val; j++) {
			
			count++;
			if (j == N-1) break;
			
		}
	
		if (count == 0) {
			std::cout << 0;
			return 0;
		} else {
			if (temp_val == 0) {
				result = 1;
			}
			
			else {
				long int mp = 1;
				//std::cout << prev_count;
				for (int i = 0; i < count; i++) {
					
					mp *= prev_count % 998244353;
					
				}
				result *= mp;
				result = result % 998244353;
				
			}
		}
		prev_count = count;
		n += count;
		temp_val++;
	}
	result = result % 998244353;
	std::cout << result;
	return 0;
	
}


Compiler output:
a.cc:6:10: fatal error: study.h: No such file or directory
    6 | #include "study.h"
      |          ^~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>

int main(void){
  long long int n;
  cin>>n;
  cout<<n*n;
  
 return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>n;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<n*n;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include<iostream>
using namespace std;

int main(void)
{
  int r;
  cin >> r;
  cout << r ** 2;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: invalid type argument of unary '*' (have 'int')
    8 |   cout << r ** 2;
      |              ^~~
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int a = sc.nextInt();
		// 
		int b = a ** 2;
		// 出力
		System.out.println(b);
	}
}

Compiler output:
Main.java:8: error: illegal start of expression
		int b = a ** 2;
		           ^
1 error
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  int n;
  cin>>n;
  cout<<n*n;
  retrun 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'retrun' was not declared in this scope
    8 |   retrun 0;
      |   ^~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
　int r;
  cin >> r;
  cout << r*r <<endl;
}


Compiler output:
a.cc:5:1: error: extended character 　 is not valid in an identifier
    5 | 　int r;
      | ^
a.cc: In function 'int main()':
a.cc:5:1: error: '\U00003000int' was not declared in this scope
    5 | 　int r;
      | ^~~~~
a.cc:6:10: error: 'r' was not declared in this scope
    6 |   cin >> r;
      |          ^
Language: Java

import java.util.Scanner;
public class Circle {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int r = sc.nextInt();
		 System.out.println(r*r);
	}
}


Compiler output:
Main.java:2: error: class Circle is public, should be declared in a file named Circle.java
public class Circle {
       ^
1 error
Language: C++

#include<bits/stdc++.h>
usins namespace std;
int main()
{
int i;
cin>>i;
cout<<i*i;
return 0;
}


Compiler output:
a.cc:2:1: error: 'usins' does not name a type
    2 | usins namespace std;
      | ^~~~~
a.cc: In function 'int main()':
a.cc:6:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 | cin>>i;
      | ^~~
      | std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 | cout<<i*i;
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
int main()
{
  int r;
  cin>>r;
  cout<<r*r<<endl
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:18: error: expected ';' before '}' token
   13 |   cout<<r*r<<endl
      |                  ^
      |                  ;
   14 | }
      | ~
Language: Java

import java.util.Scanner;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        Int r = sc.nextInt();
        System.out.println(r * r);
    }
}

Compiler output:
Main.java:5: error: cannot find symbol
        Int r = sc.nextInt();
        ^
  symbol:   class Int
  location: class Main
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {

    int r; cin >> r;
    result = pow(r, 2);
    cout << result << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'result' was not declared in this scope
    7 |     result = pow(r, 2);
      |     ^~~~~~
Language: C++

#include<iostream>
using namespace std;
int mine(){
int n; cin>> n;
cout<<n*n<<endl;
}

Compiler output:
a.cc: In function 'int mine()':
a.cc:6:1: warning: no return statement in function returning non-void [-Wreturn-type]
    6 | }
      | ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
//#include <queue>

#define rep(i,n) for(int i = 0; i < (n); ++i)
#define debug(vec) for(auto v : vec) cout << v << " "; cout << endl;

using namespace std;

typedef long long ll;

const long long int INF = 1 << 30; //10^10
const ll MOD = 998244353;

inline void maxch(int& a, int b) {if (a < b) a = b;}



int main() {
  int r;
  cin >> r;
  cout << pow(r,2)  << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:23:11: error: 'pow' was not declared in this scope
   23 |   cout << pow(r,2)  << endl;
      |           ^~~
Language: Java

import java.util.*;
public class Main{
   public static void main(String[] args) {
     Scanner sc = new Scanner(System.in);
     String s = sc.nextInt();
     System.out.println(s*s);
   }
}

Compiler output:
Main.java:5: error: incompatible types: int cannot be converted to String
     String s = sc.nextInt();
                          ^
Main.java:6: error: bad operand types for binary operator '*'
     System.out.println(s*s);
                         ^
  first type:  String
  second type: String
2 errors
Language: C++

#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <cmath>
#include <queue>
#include <vector>
#include <list>
#define rep(i,n) for(int i=0; i<n; ++i)
using namespace std;

int main() {
    int r;
    cin >> r;
    cout << r ^ 2 << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:19: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
   15 |     cout << r ^ 2 << endl;
      |                 ~~^~~~~~~
Language: C++

#!/usr/bin/env python

from collections import deque, defaultdict
import itertools as ite
import sys
import math
import decimal

sys.setrecursionlimit(1000000)

INF = 10 ** 18
MOD = 10 ** 9 + 7

n = input()
print n * n

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #!
    1 | #!/usr/bin/env python
      |  ^
a.cc:3:1: error: 'from' does not name a type
    3 | from collections import deque, defaultdict
      | ^~~~
Language: C++

#include <set>
#include <map>
#include <list>
#include <queue>
#include <stack>
#include <cmath>
#include <ctime>
#include <cstdio>
#include <vector>
#include <string>
#include <bitset>
#include <cctype>
#include <cstdlib>
#include <cstring>
#include <utility>
#include <numeric>
#include <complex>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <cassert>
#include <iostream>
#include <iterator>
#include <algorithm>
using namespace std;
typedef long long ll;
typedef vector<int> vint;
typedef pair<int, int> pint;
typedef vector<long long> vlong;
#define vpush(a,x) a.push_back(x);
#define rep(i, n) REP(i, 0, n)
#define all(v) v.begin(), v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define INF 2e9
int fact(int n){
    int m;
  if (n == 0)
      return 1;
  m = fact(n - 1);    
  return n * m;       
}
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n,r;
  cin>>n;
  cout<<pow(n,2.0)<<'\n';
  return(0)
}

Compiler output:
a.cc: In function 'int main()':
a.cc:48:12: error: expected ';' before '}' token
   48 |   return(0)
      |            ^
      |            ;
   49 | }
      | ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N;
  cin >> N;
  
  int a = N * N:
  
  cout << a << endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: found ':' in nested-name-specifier, expected '::'
    8 |   int a = N * N:
      |                ^
      |                ::
a.cc:8:15: error: 'N' is not a class, namespace, or enumeration
    8 |   int a = N * N:
      |               ^
Language: C++


#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define pi 3.1416
ll int a,b,c,d,k,i,j,sum,cnt,ar[100000],br[1000000],cr[100000],n,t,cnt1,cnt2 ,cnt3,sum2,l,m;
string s ,s1;
char c1[1000],c1[1000];
 
int main()
{cin>>t;

        cout<<t*t<<endl;

   
}

Compiler output:
a.cc:8:15: error: redefinition of 'char c1 [1000]'
    8 | char c1[1000],c1[1000];
      |               ^~
a.cc:8:6: note: 'char c1 [1000]' previously declared here
    8 | char c1[1000],c1[1000];
      |      ^~
Language: C++

#include <bits/stdc++.h>
#define ROOP(i, N) for(int i=0; i++; i<N)
#define RVROOP(i, N) for(int i=N; i--; i>=0)
#define INF 1e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
const double 3.14159265358979323846;
int main() {
  int r; cin>>r;
  cout<<r*r<<endl;
  return 0;
}

Compiler output:
a.cc:8:14: error: expected unqualified-id before numeric constant
    8 | const double 3.14159265358979323846;
      |              ^~~~~~~~~~~~~~~~~~~~~~
Language: Java

import java.util*;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int r = sc.nextInt();
		 System.out.println(r*r);
	}
}



Compiler output:
Main.java:1: error: ';' expected
import java.util*;
                ^
1 error
Language: C++

#pragma GCC optimize ("O3")
#include <bits/stdc++.h>
#define DEBUG true
#ifdef ONLINE_JUDGE
#undef DEBUG
#define DEBUG false
#endif 

using namespace std;

#define MAXN ((int)2e5+5)
#define MOD ((int)1e9 + 7)
#define INF ((int)1e9 + 9)
#define ll long long
#define _ << " " <<
#define CLEAR(a, b) memset(a, b, sizeof(a))
#define TRACE(x) if(DEBUG) cerr << #x << " = " << x << endl;
#define TRACE2(x,y) if(DEBUG) cerr << #x << " = " << x << " | " << #y << " = " << y << endl;
#define pb push_back
#define all(x) x.begin(), x.end()
#define endl "\n"
#define pii pair<int,int>
#define mid ((l+r)/2)

int main()
{
	ios_base::sync_with_stdio(false);cin.tie(0);
	cin >> n;
	cout << n*n << endl;


}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:16: error: 'n' was not declared in this scope; did you mean 'yn'?
   28 |         cin >> n;
      |                ^
      |                yn
Language: C++

//#include <bits/stdc++.h>
#include <iostream>
#include<vector>
#include <algorithm>
#include <cmath>
#include <limits>
#include <string.h>
using namespace std;

typedef long long ll;
typedef vector<int> VI;
#define rep(i,n) for(int i=0;i<(n);++i)

//example rep(i,n) cin >> h[i];

int main (){

int n,k,q;
 
  cin>>n;

  rep(i,sizeof(s))if(s[i]==s[i+1]&&s[i]!='\0')k++;
// cout<<"Hellow worldy yes"<<endl;
 
  k=n**2;;
  
  cout<<k<<endl;

  //sort(vec.begin(),vec.end());
  //reverse(vec.begin(),vec.end());

  
 return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:16: error: 's' was not declared in this scope
   22 |   rep(i,sizeof(s))if(s[i]==s[i+1]&&s[i]!='\0')k++;
      |                ^
a.cc:12:33: note: in definition of macro 'rep'
   12 | #define rep(i,n) for(int i=0;i<(n);++i)
      |                                 ^
a.cc:25:7: error: invalid type argument of unary '*' (have 'int')
   25 |   k=n**2;;
      |       ^~
Language: C++

#inlcude <iostream>
using namespace std;

int main(){
  int r;
  cin>>r; cout<<pow(r,2);
  
  return 0;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inlcude; did you mean #include?
    1 | #inlcude <iostream>
      |  ^~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin>>r; cout<<pow(r,2);
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | #inlcude <iostream>
a.cc:6:11: error: 'cout' was not declared in this scope
    6 |   cin>>r; cout<<pow(r,2);
      |           ^~~~
a.cc:6:11: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:6:17: error: 'pow' was not declared in this scope
    6 |   cin>>r; cout<<pow(r,2);
      |                 ^~~
Language: C++

#include <iostream>

int main() {
    int r;
    cin >> r;
    cout << r*r;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |     cin >> r;
      |     ^~~
      |     std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |     cout << r*r;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

#inclue<stdio.h>
int main(){
  int r;
  scanf("%d",&r);
  printf("%d",r*r);
  return 0;
}

Compiler output:
main.c:1:2: error: invalid preprocessing directive #inclue; did you mean #include?
    1 | #inclue<stdio.h>
      |  ^~~~~~
      |  include
main.c: In function 'main':
main.c:4:3: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    4 |   scanf("%d",&r);
      |   ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | #inclue<stdio.h>
main.c:4:3: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    4 |   scanf("%d",&r);
      |   ^~~~~
main.c:4:3: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:5:3: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    5 |   printf("%d",r*r);
      |   ^~~~~~
main.c:5:3: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:5:3: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:5:3: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C++

#include<stdio.h>
#include<iostream>
int n;
int main(void)
{
  	cin>>n;
  	cout<<n*n;
  	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |         cin>>n;
      |         ^~~
      |         std::cin
In file included from a.cc:2:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |         cout<<n*n;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int a = sc.nextInt();
		// 出力
		System.out.println(a ** 2);
	}
}

Compiler output:
Main.java:8: error: illegal start of expression
		System.out.println(a ** 2);
		                      ^
1 error
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n;
	cin >> r;
// 	std::vector<int> h(n, 0);
	cout << r*r;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:16: error: 'r' was not declared in this scope
    9 |         cin >> r;
      |                ^
Language: C++

#include<algorithm>
#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main() {
	int r;
	cin >> r;
	cout << r * r << endl
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:30: error: expected ';' before '}' token
    9 |         cout << r * r << endl
      |                              ^
      |                              ;
   10 | }
      | ~
Language: C++

#include <algorithm>
#include <string>
using namespace std;
int main (){
  int r;
  cout << r*r << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cout' was not declared in this scope
    6 |   cout << r*r << endl;
      |   ^~~~
a.cc:3:1: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    2 | #include <string>
  +++ |+#include <iostream>
    3 | using namespace std;
a.cc:6:18: error: 'endl' was not declared in this scope
    6 |   cout << r*r << endl;
      |                  ^~~~
a.cc:3:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    2 | #include <string>
  +++ |+#include <ostream>
    3 | using namespace std;
Language: C++

#include<iostream>
#include<vector>
using namespace std;

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

void main() {

	int N;
	cin >> N;

	cout << N*N << endl;

	return;
}

Compiler output:
a.cc:8:1: error: '::main' must return 'int'
    8 | void main() {
      | ^~~~
a.cc: In function 'int main()':
a.cc:15:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
   15 |         return;
      |         ^~~~~~
Language: C

#include <stdio.h>

int main(){

    int r = 0;

    scanf("%d", &r);
    r = r * r / 1

    printf("%d", r);

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:18: error: expected ';' before 'printf'
    8 |     r = r * r / 1
      |                  ^
      |                  ;
    9 | 
   10 |     printf("%d", r);
      |     ~~~~~~