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

#include<bits/stdc++.h>
using namespace std;
 
int main(){
int R;
  const double PI = acos(-1);
  cin >>R;
  cout << R*2*PI<<endl;
  
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C


/*
...........__________                                                                           ___  __
.............|       |                                                                           |   /
.............|       |                                                                           |  /
.............|       |                               |                         __                | /      _______
.............|_______|  _______            _______   |______   ________   /|  /  |               |/       |      |
.............| \               | |      | |          |      |          | / | /   |               |\       |
.............|  \       _______| |      | |_______   |      |   _______|   |/    |               | \      |
.............|   \      |      | |      |         |  |      |  |       |   |     |               |  \     |
...........__|    \__|  |______| |______| ________|  |      |_ |_______|   |     |__|           _|   \__ _|        .

*/
#include<bits/stdc++.h>
using namespace std ;
#define int                 long long
#define ull                 unsigned long long int
#define ld                  long double
#define vi                  vector<int>
#define vii                 vector<pair<int,int>>
#define vvi                 vector<vector<int>>
#define pii                 pair<int,int>
#define prec(x)             fixed<<setprecision(15)<<x
#define all(x)              x.begin(),x.end()
#define rall(x)             x.rbegin(),x.rend()
#define rev(x)              reverse(x.begin(),x.end())
#define mset(a,b)           memset(a,b,sizeof(a))
#define mcpy(a,b)           memcpy(a,b,sizeof(a))
#define fo0(i,n)            for(int i=0,i##end=n;i<i##end;i++)
#define fo1(i,n)            for(int i=1,i##end=n;i<=i##end;i++)
#define fo(i,a,b)           for(int i=a,i##end=b;i<=i##end;i++)
#define foe(i,x)            for(__typeof((x).end())i=(x).begin();i!=(x).end();++i)
#define fre(i,x)            for(__typeof((x).rend())i=(x).rbegin();i!=(x).rend();++i)
#define fast ios_base::sync_with_stdio(false); cin.tie(0);cout.tie(0)
int gcd(int a, int b) { return b ? gcd(b, a%b) : a; }
#define inf 1e18
const int mod=1e9+7;
const int N=2e5+9;
const int pi=3.14159265358979323846
void raushan_kumar(){

    /////////////////variables///////////////
    int d=0,e=0,f=0,g=0;
    double f1=0.0,f2=0.0,f3=0.0;
    int flag=0,ans=0,res=0,cnt=0,sum=0;
    /////////////////////////////////////////
    int n;cin>>n;
    printf("%.20f",2*pi*n);

    
}

int32_t main()
{
    fast;int t=1;
    //cin>>t;
    while(t--){
        raushan_kumar();
    }

}

Compiler output:
main.c:14:9: fatal error: bits/stdc++.h: No such file or directory
   14 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: Java

int R;
double L;
Scanner scanner =new Scanner(System.in);
R=scanner.nextInt();
L=R*2*Math.PI;
System.out.printf(L);

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:4: error: class, interface, enum, or record expected
R=scanner.nextInt();
^
Main.java:5: error: class, interface, enum, or record expected
L=R*2*Math.PI;
^
Main.java:6: error: class, interface, enum, or record expected
System.out.printf(L);
^
4 errors
Language: C

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

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main() {
  
  int pi;
  
  pi=3.14159265358979323846
    

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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


int main(){
    int R;
    cin >> R;

    cout << R * M_PI << endl;
    }

Compiler output:
main.c:1:10: error: #include expects "FILENAME" or <FILENAME>
    1 | #include #include <bits/stdc++.h>
      |          ^
main.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
main.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~
main.c: In function 'main':
main.c:7:5: error: 'cin' undeclared (first use in this function)
    7 |     cin >> R;
      |     ^~~
main.c:7:5: note: each undeclared identifier is reported only once for each function it appears in
main.c:9:5: error: 'cout' undeclared (first use in this function)
    9 |     cout << R * M_PI << endl;
      |     ^~~~
main.c:9:17: error: 'M_PI' undeclared (first use in this function)
    9 |     cout << R * M_PI << endl;
      |                 ^~~~
main.c:9:25: error: 'endl' undeclared (first use in this function)
    9 |     cout << R * M_PI << endl;
      |                         ^~~~
Language: Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        final Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        int r = in.nextInt();
        System.out.println(2.0 * Math.PI * r);
    }
}


Compiler output:
Main.java:5: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
1 error
Language: C

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

int main(){
int R;
  cin >>R;
  cout << R*2*3.14<<endl;
  
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define loop(i,a,n) for(int i=a;i<n;i++)
#define ps(x) cout<<x<<" "
#define pn(x) cout<<x<<"\n"
#define sz(a) int((a).size())
#define pb push_back
typedef vector< int > vi;
typedef pair< int,int > pairs;

int main()
{
 ll n;
 cin>>n;
 cout<<2*3.1428*n;   
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Test {

    public static void main(String[] args) {
        final Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        int r = in.nextInt();
        System.out.println(2.0*Math.PI*r);
    }
}


Compiler output:
Main.java:5: error: class Test is public, should be declared in a file named Test.java
public class Test {
       ^
1 error
Language: C

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

int main() {
  int R;  
  cin >> R;
  cout<< M_PI*R*2 << endl;
}
    

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
// #include <math.h>
 
using namespace std;
 
#define rep(i, n) for(int i=0; i<(n); i++)
#define FOR(i, m, n) for(int i=(m);i<(n);i++)
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
#define SORT(x) sort((x).begin(),(x).end())
#define REVE(x) reverse((x).begin(),(x).end())
#define mp make_pair
#define pb push_back
 
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<vector<int> > VVI;
typedef pair<int, int> PII;
typedef long long LL;
typedef vector<bool> VB;
 
int main() {
    int r;
    cin >> r;
    // cout << 2*M_PI*r << endl;
    printf("%.12f\n",2*M_PI*r);
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main(){
  int R;  
  cin >> R;
  cout<< M_PI*R*2 << endl;
}
    


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

import java.util.Scanner;
 
public class InputSample {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
 
        System.out.println(num * 2 * 3.14);
        scan.close();
    }
}

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

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

int main() {
    double R;
    double Pi = 3.141592653589793238;
    cin >> R;
    cout << fixed << setprecision(20) << 2 * R * Pi << endl;
    return 0;
}

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

#include <iostream>
#include <cmath>
using namespace std;
 
int main()
{
  double r;
  cin >> r;
  double ans = acos(-1) * r;
  cout << ans << endl;
}


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

#include <iostream>
#include <cmath>

int main()
{
  double r;
  cin >> r;
  double ans = acos(-1) * r;
  cout << ans << endl;
}

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

#pragma GCC optimize ("O3")
#include<bits/stdc++.h>




#include <cstring>

#define pb push_back
#define p push

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define ll long long

#define getI(a) scanf("%d",&a)
#define getII(a, b) scanf("%d%d",&a,&b)
#define getIII(a, b, c) scanf("%d%d%d",&a,&b,&c)
#define getL(a) scanf("%lld",&a)
#define getLL(a, b) scanf("%lld%lld",&a,&b)
#define getLLL(a, b, c) scanf("%lld%lld%lld",&a,&b,&c)
#define BEND(c) (c).begin(),(c).end()
#define BEND2(c) (c).rbegin(),(c).rend()
#define fi first
#define se second
#define pi 3.1415926535897932384626
#define getS(a) scanf("%s",a)
#define pfb(a) printf("%.10lf\n",a);
#define pfi(a) printf("%d",a);
#define pfii(a, b) printf("%d%d",a,b);
#define pfl(a) printf("%lld",a);
#define pfll(a, b) printf("%lld%lld",a,b);
#define pfd(a) printf("%.12lf ",a);
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);
#define endl "\n"

#define MOD  ( int)(1e9 + 7)
#define MAXN (ll) ((1e6+5))
#define K 25
#define  ALPHABET_SIZE  26
//#define N (int)(1e5+10)
#define sag (sol|1)
#define sol (root<<1)
#define ort (bas+son)/2
#define INF (ll )1e18
#define int ll
using namespace std;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pair<int, int>>> vvpi;
typedef vector<long long> vl;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<long long, long long>> vpl;
typedef pair<int, int> pii;
typedef pair <ll, ll> pll;
typedef vector<vi> graph;


signed main(){
	ll n;
	cin >> n;
	double res = 2.0 * pi * n;
	pfd(res);


	return 0; 
}

Compiler output:
main.c:2:9: fatal error: bits/stdc++.h: No such file or directory
    2 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#pragma GCC optimize ("O3")
//#include<bits/stdc++.h>

#include <iostream>
#include <cstdio>
#include <queue>
#include <set>
#include <string>
#include <stdbool.h>
#include<ctime>

#include <cstring>

#define pb push_back
#define p push

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define ll long long

#define getI(a) scanf("%d",&a)
#define getII(a, b) scanf("%d%d",&a,&b)
#define getIII(a, b, c) scanf("%d%d%d",&a,&b,&c)
#define getL(a) scanf("%lld",&a)
#define getLL(a, b) scanf("%lld%lld",&a,&b)
#define getLLL(a, b, c) scanf("%lld%lld%lld",&a,&b,&c)
#define BEND(c) (c).begin(),(c).end()
#define BEND2(c) (c).rbegin(),(c).rend()
#define fi first
#define se second
#define pi 3.1415926535897932384626
#define getS(a) scanf("%s",a)
#define pfb(a) printf("%.10lf\n",a);
#define pfi(a) printf("%d",a);
#define pfii(a, b) printf("%d%d",a,b);
#define pfl(a) printf("%lld",a);
#define pfll(a, b) printf("%lld%lld",a,b);
#define pfd(a) printf("%.12lf ",a);
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);
#define endl "\n"

#define MOD  ( int)(1e9 + 7)
#define MAXN (ll) ((1e6+5))
#define K 25
#define  ALPHABET_SIZE  26
//#define N (int)(1e5+10)
#define sag (sol|1)
#define sol (root<<1)
#define ort (bas+son)/2
#define INF (ll )1e18
#define int ll
using namespace std;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pair<int, int>>> vvpi;
typedef vector<long long> vl;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<long long, long long>> vpl;
typedef pair<int, int> pii;
typedef pair <ll, ll> pll;
typedef vector<vi> graph;


signed main(){
	ll n;
	cin >> n;
	double res = 2.0 * pi * n;
	pfd(res);


	

	return 0; 
}

Compiler output:
main.c:4:10: fatal error: iostream: No such file or directory
    4 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

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

int main(int argc, char *argv[]) {
  ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
  cout.precision(17);
  int t;cin>>t;  
  cout<<t*2*M_PI<<endl;
  return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>

using namespace std ;
void Main(){
cin.sync_with_stdio(0);
cin.tie(0);
}

int main(){
Main();

int r ; cin >> r ;
double bie = 3.14 ;

cout << 2 * bie * r ;





return 0 ;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

import java.util.Scanner;
 
public class InputSample {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
 
        System.out.println(num * 2 * 3.14);
        scan.close();
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.Scanner;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.Scanner;
      |            ^
main.c:3:1: error: unknown type name 'public'
    3 | public class InputSample {
      | ^~~~~~
main.c:3:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'InputSample'
    3 | public class InputSample {
      |              ^~~~~~~~~~~
Language: C

#include <iostream>
//#include <bits/stdc++.h>
// a&1 check odd or not and a>>=1 halfs a
// for(int& i : vector) cin>>i input
#include <cstdlib>
#include <cstdio>
#include <vector>
#include <queue>
#include <algorithm>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define pb(x) push_back(x)
#define F first
#define S second
using namespace std;

void solve(){
	double pi=3.14159;
	double rad;
	cin>>rad;
	cout<<2*rad*pi<<endl;


}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	int t=1;
	//~ cin>>t;
	while(t--){
		solve();
	}
	return 0;
}



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

#include<bits/stdc++.h>
using namespace std;
int main(){

    int n,b[200010],t;
    cin>>n;


   for(int i=0;i<n-1;i++)
      cin>>t;
      b[t-1]++;
    }
    for(i=0;i<n;i++){
        cout<<b[i]<<endl;
    }


}


Compiler output:
a.cc:13:5: error: expected unqualified-id before 'for'
   13 |     for(i=0;i<n;i++){
      |     ^~~
a.cc:13:13: error: 'i' does not name a type
   13 |     for(i=0;i<n;i++){
      |             ^
a.cc:13:17: error: 'i' does not name a type
   13 |     for(i=0;i<n;i++){
      |                 ^
a.cc:18:1: error: expected declaration before '}' token
   18 | }
      | ^
Language: Java

import java.util.Scanner;

public class ABC163A {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner stdIn = new Scanner(System.in);
		int R = stdIn.nextInt();
		System.out.println((double)R * 2 * Math.PI);
	}
}

Compiler output:
Main.java:3: error: class ABC163A is public, should be declared in a file named ABC163A.java
public class ABC163A {
       ^
1 error
Language: C

N, M = map(int, input().split())
A = list(map(int, input().split()))
 
goukei = sum(A)
 
if goukei > N:
  print(-1)
  
else:
  print(N-goukei)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | N, M = map(int, input().split())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
main.c:1:4: error: type defaults to 'int' in declaration of 'M' [-Wimplicit-int]
    1 | N, M = map(int, input().split())
      |    ^
main.c:1:8: error: implicit declaration of function 'map' [-Wimplicit-function-declaration]
    1 | N, M = map(int, input().split())
      |        ^~~
main.c:1:12: error: expected expression before 'int'
    1 | N, M = map(int, input().split())
      |            ^~~
main.c:2:1: error: expected ',' or ';' before 'A'
    2 | A = list(map(int, input().split()))
      | ^
Language: C++

　#include <iostream>
using namespace std;
int main () {
  int R=24;
  cin >> R;
  cout << R*3.141592 <<endl;
}


Compiler output:
a.cc:1:1: error: extended character 　 is not valid in an identifier
    1 | 　#include <iostream>
      | ^
a.cc:1:3: error: stray '#' in program
    1 | 　#include <iostream>
      |   ^
a.cc:1:1: error: '\U00003000' does not name a type
    1 | 　#include <iostream>
      | ^~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin >> R;
      |   ^~~
a.cc:6:3: error: 'cout' was not declared in this scope
    6 |   cout << R*3.141592 <<endl;
      |   ^~~~
a.cc:6:24: error: 'endl' was not declared in this scope
    6 |   cout << R*3.141592 <<endl;
      |                        ^~~~
Language: C++

　#include <iostream>
using namespace tid;
int main () {
  int R=24;
  cin >> R;
  cout << R*3.141592 <<endl;
}

Compiler output:
a.cc:1:1: error: extended character 　 is not valid in an identifier
    1 | 　#include <iostream>
      | ^
a.cc:1:3: error: stray '#' in program
    1 | 　#include <iostream>
      |   ^
a.cc:1:1: error: '\U00003000' does not name a type
    1 | 　#include <iostream>
      | ^~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin >> R;
      |   ^~~
a.cc:6:3: error: 'cout' was not declared in this scope
    6 |   cout << R*3.141592 <<endl;
      |   ^~~~
a.cc:6:24: error: 'endl' was not declared in this scope
    6 |   cout << R*3.141592 <<endl;
      |                        ^~~~
Language: C

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

int main() {
    int a;
    cin >> a;

    cout << (a + a) * 3.141592 << endl;

}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
#define fo(i,n) for(int i = 0; i < n; i++)
#define pb push_back
#define all(c) c.begin(),c.end()



int main()
{
    double r;
    cin >> r;
    cout << r*2*3.14 << endl;
    return 0;


}



Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include<math.h>

int main()
{
    double r;
    std::cin >> r;
    std::cout << r*2*M_PI << std::endl;
    return 0;
}

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

#include<bits/stdc++.h>
using namespace std;
int main()
    {
        int R;
        cin>>R;
        cout<<(float)(2*3.1416*R);
    }


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>

using namespace std;

#define MX 35
#define MOD 1'000'000'007
#define F first
#define S second
#define br '\n'

typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(nullptr);

	double r;
	cin >> r;
	cout << setprecision(10) << acos(-1) * r * 2 << endl;

	return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<iostream>
#include<stdio.h>
#include <vector>
#include <algorithm>
using namespace std;

int main(){
  //整数の時はint
  int a,b,m;
  double c;
  //文字の時はstring
  //string a;
  const double PI=3.14159265358979323846;
  cin>>c;
  cout<<c*PI*2.0<<endl;

 
  return 0;
}



Compiler output:
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
#define ll long long 
#define pi 3.14
using namespace std;

int main()
{
  ll r;
  cin>>r;
  cout<<fixed<<setprecence(20)<<2*pi*r<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:16: error: 'setprecence' was not declared in this scope
   10 |   cout<<fixed<<setprecence(20)<<2*pi*r<<endl;
      |                ^~~~~~~~~~~
Language: C

#include<bits/stdc++.h>
#define ll long long 
#define pi 3.14
using namespace std;

int main()
{
  ll r;
  cin>>r;
  cout<<fixed<<setprecence(20)<<2*pi*r<<endl;
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

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

int n, a, dp[2005][2005];
vector <pair<int, int> > v;

int solve(int l, int r){
    if (~dp[l][r]) return dp[l][r];
    if (l > r) return dp[l][r] = 0;
    int idx = (r-l);
    return max(solve(l+1, r) + abs(v[idx].second-l)*v[idx].first , solve(l, r-1) + abs(r-v[idx].second)*v[idx].first);
}

int main() {
    cin >> n;
    memset(dp, -1, sizeof(dp));
    for (int i = 0; i < n; i++){
        cin >> a;
        v.push_back({a, i});
    }
    sort(v.begin(), v.end());
    cout << solve(0, n-1) << "\n";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:23:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   23 |     sort(v.begin(), v.end());
      |     ^~~~
      |     short
Language: C++

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

int main(){
  int r;
  cin >> r;
  double ans = 2*r*acos(-1);
  printf("%.10f\n, ans);
  return 0;
}

Compiler output:
a.cc:8:10: warning: missing terminating " character
    8 |   printf("%.10f\n, ans);
      |          ^
a.cc:8:10: error: missing terminating " character
    8 |   printf("%.10f\n, ans);
      |          ^~~~~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:9:3: error: expected primary-expression before 'return'
    9 |   return 0;
      |   ^~~~~~
Language: C

#include <stdio.h>

#define PI 3.1412

int main()
{
  int iR;
  float fAns;
  
  scanf_s("%d", &iR);
  
  fAns = iR * iR * PI;
  
  printf("%.3f\n", fAns);
}

Compiler output:
main.c: In function 'main':
main.c:10:3: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
   10 |   scanf_s("%d", &iR);
      |   ^~~~~~~
      |   scanf
Language: C++

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

int main(){
  int r;
  cin >> r;
  double ans = r*6.823
  printf("%.10f\n", ans)
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'printf'
    8 |   printf("%.10f\n", ans)
      |   ^~~~~~
Language: C

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

#define int long long
#define endl "\n"
#define REP(i,a,n) for(int i=a;i<n;++i)
#define REPR(i,a,n) for(int i=a;i>n;--i)
#define RUP(a,b) (((a)+(b)-1)/(b))
#define ALL(v) (v).begin(),(v).end()
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define MOD 1000000007
#define INF LLONG_MAX/2
#define PI acos(-1.0)
#define SUM(v) accumulate((v).begin(),(v).end(),0ll)
#define range(i,left,right) (left<=i && i<right)

typedef long long ll;
typedef pair<int,int> Pii;
typedef tuple<int,int,int> Tiii;
typedef vector<int> Vi;
typedef vector<Vi> VVi;
typedef vector<Pii> VPii;
typedef vector<string> Vs;
typedef priority_queue<int> PQi;

template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
void vout(Vi &v){for(int i=0;i<(v).size();i++) cout<<v[i]<<" ";cout<<endl;}
void vout(Vs &v){for(int i=0;i<(v).size();i++) cout<<v[i]<<" ";cout<<endl;}
void vvout(VVi &v){for(int i=0;i<(v).size();i++) vout(v[i]);}
int gcd(int a,int b){return b?gcd(b,a%b):a;}
int lcm(int a,int b){return a/gcd(a,b)*b;}
int mypow(int x, int n, int m){if(n==0)return 1;if(n%2==0)return mypow(x*x%m,n/2,m);else return x*mypow(x,n-1,m)%m;}
int digit(int k,int i){string s = to_string(k);return s[s.size()-i]-'0';}
void uniq(Vi &v){sort(v.begin(),v.end()); v.erase(unique(v.begin(),v.end()),v.end());} //vectorの同じ要素消す
int ctoi(char c){if(c>='0'&&c<='9'){return c-'0';}return 0;}
int leng(int n){string s=to_string(n); return s.size();} //intの桁数
int digitsum(int n){int ret=0; while(n>0){ret+=n%10;n/=10;}return ret;} //桁和
int lesscount(int x,Vi &a){return lower_bound(a.begin(),a.end(),x)-a.begin();} //vector aにおけるx未満の数の個数
int orlesscount(int x,Vi &a){return upper_bound(a.begin(),a.end(),x)-a.begin();} //vector aにおけるx以下の数の個数
int morecount(int x,Vi &a){return a.size()-orlesscount(x,a);} //vector aにおけるxより大きい数の個数
int ormorecount(int x,Vi &a){return a.size()-lesscount(x,a);} //vector aにおけるx以上の数の個数
int iscount(int x,Vi &a) {return upper_bound(ALL(a),x)-lower_bound(ALL(a),x);} //vector aにおけるxの個数
Vi accum(Vi &v){Vi ret((v).size()+1);REP(i,0,(v).size()) ret[i+1]=ret[i]+v[i];return ret;}
bool comp(Pii a,Pii b){
    if(a.second != b.second) return a.second<b.second;
    else return a.first<b.first;
}

signed main(){cin.tie(0);cout.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);
    double r;
    cin>>r;
    cout<<r*PI*2<<endl;
    return 0;
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>

int main(void)
{
    int R;
    
    R=R*2*3.14;
    
    printf("%d\n" R);
  
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:9:18: error: expected ')' before 'R'
    9 |     printf("%d\n" R);
      |           ~      ^~
      |                  )
Language: C

#include <stdio.h>

int main()
{
    int R;
    
    R=R*2*3.14;
    
    printf("%d\n" R);
  
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:18: error: expected ')' before 'R'
    9 |     printf("%d\n" R);
      |           ~      ^~
      |                  )
Language: C

#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define ini(arr, val) memset(arr, (val), sizeof(arr))
#define loop(i,n)  for(ll i=0; i<n; i++)
#define loop1(i,n)  for(ll i=1; i<=n; i++)

#define all(a)      (a).begin(),(a).end()
#define exist(s,e)  (s.find(e)!=s.end())
#define dbg(x)  cout << #x << " = " << x << endl
#define pt(x) cout<<x<<"\n"
#define pts(x) cout<<x<<" "

#define mp make_pair
#define pb push_back
#define F first
#define S second


#define inf (int)1e9
#define infll 1e18
#define eps 1e-9
#define PI 3.1415926535897932384626433832795
#define mod 1000000007


#define fast    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define test   int t; cin>>t; while(t--)

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<pii> vpii;
typedef vector<vi> vvi;
typedef map<int,int> mii;
typedef set<int> si;

typedef pair<ll, ll> pll;
typedef vector<ll> vl;
typedef vector<string> vs;
typedef vector<pll> vpll;
typedef vector<vl> vvl;
typedef map<ll,ll> mll;
typedef set<ll> sl;


int dirx[] = { -1, -1, -1, 0, 0, 1, 1, 1 };
int diry[] = { -1, 0, 1, -1, 1, -1, 0, 1 };



//===========================DEBUG======================//
#define XOX 1
vector<string> vec_splitter(string s) {
	s += ',';
	vector<string> res;
	while(!s.empty()) {
		res.push_back(s.substr(0, s.find(',')));
		s = s.substr(s.find(',') + 1);
	}
	return res;
}
void debug_out(
vector<string> __attribute__ ((unused)) args,
__attribute__ ((unused)) int idx, 
__attribute__ ((unused)) int LINE_NUM) { cerr << endl; } 
template <typename Head, typename... Tail>
void debug_out(vector<string> args, int idx, int LINE_NUM, Head H, Tail... T) {
	if(idx > 0) cerr << ", "; else cerr << "Line(" << LINE_NUM << ") ";
	stringstream ss; ss << H;
	cerr << args[idx] << " = " << ss.str();
	debug_out(args, idx + 1, LINE_NUM, T...);
}
#ifdef XOX
#define debug(...) debug_out(vec_splitter(#__VA_ARGS__), 0, __LINE__, __VA_ARGS__)
#else
#define debug(...) 42
#endif

//================================================================//



//////////////////////////////////////////////////////////////////////////////////////////
//                      main starts
//////////////////////////////////////////////////////////////////////////////////////////
int const lmt=1e5+5;


int main(){
    #ifndef ONLINE_JUDGE
    // freopen("../input.txt", "r", stdin);
    freopen("../output.txt", "w", stdout);
	#endif
    fast

    ll r;
    cin>>r;
    cout<<fixed<<setprecision(2)<<2*3.1415*r<<endl;
    
}


/*



*/





Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main() {
    int r;
    cin >> r;
    cout << 2 * acos(-1) * r;
    return 0;
}


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

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

  int R;
  cin >> R;
  cout << 6.283*R << endl;

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

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

  cout<<fixed<<setprecision(10)<<2*r*M_PI<<endl;

  return 0;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<iostream>
using namespace std;
int main()
{
 
  
  int R;
  cin >> R;
  
  cout << R*2*3.14 << endl;
  
}


Compiler output:
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define drep(i,n) for(int i = (n-1); i >= 0; i--)
#define all(v) (v).begin(),(v).end()
template <class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return 1; } return 0; }
template <class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return 1; } return 0; }
template <class T> T gcd(T a, T b) { return b ? gcd(b, a % b) : a; }
template <class T> T lcm(T a, T b) { return a/gcd(a,b)*b; }
typedef pair<int, int> P;
typedef long long ll;
const int INF = 1001001001;
const ll LINF = 1001002003004005006ll;
const ll MOD = 1e9+7;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
	int r;
	cin >> r;
    float ans = M_PI * 2 * r;
	cout << ans << "\n";
	return 0;
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
#define F first
#define S second
using namespace std;
typedef long long ll;
double pi = 2 * acos(0.0);
int main()
{
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int r;
    cin >> r;
    cout << fixed << setprecision(12) << 2 * pi * r;
    return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
using namespace std;
int main(){
    const double Pi=3.14159265358979323846264338328;
    int R = 0;
    cin>>R;
    cout<<R*Pi;
}



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

#include <bits/stdc++.h>
using namespace std;
int main(){
    const double Pi=3.14159265358979323846264338328;
    int R = 0;
    cin>>R;
    cout<<R*Pi;
}



Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <map>
#include <unordered_map>
#include <unordered_set>
#include <set>
#include <vector>
#include <numeric>
#include <algorithm>
#include <iostream>
#include <string>
#include <cstring>
#include <sstream>
#include <functional>
#include <queue>
#include <deque>
#include <stack>
#include <cassert>
#include <bitset>

using namespace std;

using int64 = long long;

/////////////////////
// Code starts here//
/////////////////////


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    double R;
    cin >> R;
    cout << 2 * M_PI * R << "\n";

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:17: error: 'M_PI' was not declared in this scope
   34 |     cout << 2 * M_PI * R << "\n";
      |                 ^~~~
Language: C

/*
 ID: swagchicken1
 PROG:
 LANG: C++11
 */

#include <iostream>
#include <tuple>
#include <cmath>
#include <string>
#include <cstring>
#include <vector>
#include <deque>
#include <queue>
#include <stack>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <algorithm>
#include <vector>
#include <fstream>
#include <iomanip>
#include <ctime>
#include <cctype>
#include <climits>
#include <chrono>

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector< vector <int> > vvi;
typedef pair<int, int> pii;
typedef pair < pair < int, int >, int > piii;
typedef pair < pair <int, int > , pair <int, int> > piiii;

#define FOR(i,a,b) for(int i = a; i < b; i ++)
#define RFOR(i,a,b) for(int i = a-1; i >= b; i --)

//#define endl '\n';

#define mp make_pair
#define pb push_back
#define f first
#define s second

const int MOD = 998244353;

long double PI = 4*atan(1);
long double eps = 1e-12;



int main() {
    //auto start = chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);cin.tie(0);
    //ofstream cout("output.txt");
    //ifstream cin("input.txt");
    int n; cin >> n; cout << 2 * PI * n << endl;
    
    
    
    //auto stop = chrono::high_resolution_clock::now();
    //auto duration = chrono::duration_cast<chrono::microseconds>(stop - start);
    //cout << duration.count() << endl;
    //cin.close();
    //cout.close();
}


Compiler output:
main.c:7:10: fatal error: iostream: No such file or directory
    7 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>

int main(void) {
	float input = 0;
	float output = 0;
	scanf("%f", &input);
	output = 2 * input*M_PI;
	printf("%.3f\n", output);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:28: error: 'M_PI' undeclared (first use in this function)
    7 |         output = 2 * input*M_PI;
      |                            ^~~~
main.c:7:28: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>

int Question163A(void) {
	float input = 0;
	float output = 0;
	scanf("%f", &input);
	output = 2 * input*M_PI;
	printf("%.3f\n", output);
	return 0;
}

Compiler output:
main.c: In function 'Question163A':
main.c:7:28: error: 'M_PI' undeclared (first use in this function)
    7 |         output = 2 * input*M_PI;
      |                            ^~~~
main.c:7:28: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>

int Question163A(void) {
	int input = 0;
	double output = 0;
	scanf("%d", &input);
	output = 2 * 3.14* input;
	printf("%.3f\n", output);
	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

int Question163A(void) {
	int input = 0;
	double output = 0;
	scanf("%d", &input);
	output = 2 * 3.14* input;
	printf("%f\n", output);
	return 0;
}

Compiler output:
main.c: In function 'Question163A':
main.c:4:9: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    4 |         scanf("%d", &input);
      |         ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int Question163A(void) {
main.c:4:9: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    4 |         scanf("%d", &input);
      |         ^~~~~
main.c:4:9: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:6:9: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    6 |         printf("%f\n", output);
      |         ^~~~~~
main.c:6:9: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:6:9: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:6:9: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: Java

import java.util.*;
import java.io.*;

public class A {
    public static void main(String[] args) throws IOException{
        BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        out.println(2.0*Math.PI*Double.parseDouble(f.readLine()));

        out.close();
    }
}


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

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

int main() {
	int R;
	cin >> R;

	cout << 2 * R * M_PI << endl;

	return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

//Using FeatherPad
#include <bits/stdc++.h>
#define problem_solving ios::sync_with_stdio(0);cin.tie(0);
#define oo (int)1e9 + 10
#define all(x) x.begin(), x.end()
using namespace std;

void solve(int case_number) {
	double r;
	cin >> r;
	cout << fixed << setprecision(20);
	cout << r * 6.28318530717958623200 << endl;
}


int main() {
	problem_solving
	int cases = 1;
	//cin >> cases;
	for(int i=0;i<cases;i++)
		solve(i + 1);
	return 0;
}



Compiler output:
main.c:2:10: fatal error: bits/stdc++.h: No such file or directory
    2 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
  int t;
  cin>>t;
  cout<<set_precision(2)<<2*3.14*t<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'set_precision' was not declared in this scope
    8 |   cout<<set_precision(2)<<2*3.14*t<<endl;
      |         ^~~~~~~~~~~~~
Language: C++

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

int main()
{
  int t;
  cout<<set_precision(2)<<2*3.14*r<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'set_precision' was not declared in this scope
    7 |   cout<<set_precision(2)<<2*3.14*r<<endl;
      |         ^~~~~~~~~~~~~
a.cc:7:34: error: 'r' was not declared in this scope
    7 |   cout<<set_precision(2)<<2*3.14*r<<endl;
      |                                  ^
Language: C++

#include<iostream>
using namespace std;

int main(){
  int a;
  cin >> a;
  cout << 3.1415a << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: unable to find numeric literal operator 'operator""a'
    7 |   cout << 3.1415a << endl;
      |           ^~~~~~~
Language: C++

#include<iostream>
using namespase std;

int main(){
  int a;
  cin >> a;
  cout << 3.1415a << endl;
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespase'
    2 | using namespase std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> a;
      |   ^~~
      |   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:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout << 3.1415a << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:7:11: error: unable to find numeric literal operator 'operator""a'
    7 |   cout << 3.1415a << endl;
      |           ^~~~~~~
a.cc:7:22: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |   cout << 3.1415a << endl;
      |                      ^~~~
      |                      std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C

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

/* Typedefs */

typedef long long ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;

/* Consts */

const ll INF = 1e18;
const ll MOD = 998244353;
const ll MX = 1000001;

void solve() {
    
}

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
    // ll T; cin >> T;
    // while (T--) solve();
    int R; cin >> R;
    cout << 2 * M_PI * R;
    return 0;
    // You should actually read the stuff at the bottom
}

/* Stuff to Look For
 * -----------------
 * Int overflow, array bounds
 * Initializing all variables, avoid weird behavior
 * Edge cases(n = 0, n = 1)
 * Just return 0 after result
 */


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include <math.h>
using namespace std;
int main(){
  int R;
  cout<<"Type R";cin>>R;
  if (R>=1 && R<=100) 
  	cout<<(R*2)*M_PI 
  else
	cout<<"ERROR";
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: expected ';' before 'else'
    9 |   else
      |   ^~~~
Language: C

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

int main() {

  int R ;
  
  cin >> R ;

  cout << R * 3.1415 << endl;

}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main() {
  
  int R;

  cin >> R ;

  cout << R * 3.14 << endl;

}

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

import java.util.Scanner;

public class TaskA {
    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
        double r=scan.nextDouble();
        System.out.println(Math.PI*r*2);
    }
}


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

#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <stdio.h>
#include <math.h>

//A	Circle Pond	2 sec	1024 MB	提出
int Question163A(void) {
	float input;
	float output;
	scanf("%f", &input);
	output = 2 * input*M_PI;
	printf("%.2f\n", output);
}


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

#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <stdio.h>
#include <math.h>

int Question163A(void) {
	float input = 0;
	float output = 0;
	scanf("%f", &input);
	output = 2 * input*M_PI;
	printf("%.2f\n", output);
	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

/* Author - xorier4104 */

#include <bits/stdc++.h>
#include <unordered_map>
#include <unordered_set>
#include <algorithm>


using namespace std;

#define ll              long long int
#define ld              long double
#define db              double
#define pi              3.1415926535897932384626
#define PI              acos(-1.0)
#define endl            "\n"
#define mod             1000000007
#define MOD 			(int) 1e9+7
#define mk              make_pair
#define pb              push_back
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define ps(x,y)         fixed<<setprecision(y)<<x
#define w(t)            ll t; cin>>t; while(t--)
#define sc(a)	        scanf("%lld",&a);
#define pr(a)	        printf("%lld\n",a)
#define f(i,a,n)		for(ll i=a;i<n;i++)
#define m(a)		    memset(a,0,sizeof(a))
#define mem(a,b)        memset(a,(b),sizeof(a))
#define max(a,b)        ((a)>(b) ? (a):(b))
#define min(a,b)        ((a)<(b) ? (a):(b))
#define abs(a)          ((a)>0 ? (a):(-(a)))
#define sq(a) 			((a)*(a))
#define FastIO          ios_base::sync_with_stdio(0);cin.tie(0),cout.tie(0)

int main(){ FastIO;

	int n;

		cin>>n;
		double answer=2*n*pi;

		cout<<setprecision(20)<<answer<<endl;

return 0;	
}

Compiler output:
main.c:3:10: fatal error: bits/stdc++.h: No such file or directory
    3 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.