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

#include<bits/stdc++.h>
using namespace std;
#define MOD 1000000007
#define pb push_back
 
int n,a[2005];
 
int32_t main(){
   float r;
   cin<<r;
   cout<<2*3.14*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;
int main(){
  double a;
  cin>>a;
  cout<<a*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++.>
using namespace std;
int main(){
  double a;
  cin>>a;
  cout<<a*3,14<<endl;
}

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

#include<bits/stdc++.h>
using namespace std;
#define MOD 1000000007
#define pb push_back
 
int n,a[2005];
 
int32_t main(){
   float r;
   cout<<2*3.14*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>
#define repn(i, n) for (int i = 0; i < (n); i++)
#define repr(i, a, b) for (int i = (a); i < (b); i++)
#define rep(i, ...) select(__VA_ARGS__, repr, repn)(i, __VA_ARGS__)
using namespace std;


int main() {
    long long num, K;
    cin >> num >> K;

    long long sum = 0;
    rep(i, K, num + 2) 
    {
        sum = (sum + (i * (num + 1 - i) + 1)) % 1000000007;
    }
    cout << sum << "\n";
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:4:41: error: 'repr' was not declared in this scope
    4 | #define rep(i, ...) select(__VA_ARGS__, repr, repn)(i, __VA_ARGS__)
      |                                         ^~~~
a.cc:13:5: note: in expansion of macro 'rep'
   13 |     rep(i, K, num + 2)
      |     ^~~
a.cc:4:47: error: 'repn' was not declared in this scope
    4 | #define rep(i, ...) select(__VA_ARGS__, repr, repn)(i, __VA_ARGS__)
      |                                               ^~~~
a.cc:13:5: note: in expansion of macro 'rep'
   13 |     rep(i, K, num + 2)
      |     ^~~
a.cc:13:9: error: 'i' was not declared in this scope
   13 |     rep(i, K, num + 2)
      |         ^
a.cc:4:53: note: in definition of macro 'rep'
    4 | #define rep(i, ...) select(__VA_ARGS__, repr, repn)(i, __VA_ARGS__)
      |                                                     ^
Language: C

#include<stdio.h>
#define PI 3.141592

int main(void) {

	double R;
	double L;
	scanf_s("%lf", &R);

	L = R * PI;


	printf("%f", L);

	return 0;

}

Compiler output:
main.c: In function 'main':
main.c:8:9: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    8 |         scanf_s("%lf", &R);
      |         ^~~~~~~
      |         scanf
Language: C

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

int main()
{
	double r;
	cin>>r;
	cout<<r*6.28<<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>
#define PI 3.141592

int main(void) {

	double R;
	double L;
	scanf_s("%lf", &R);

	L = R * PI;


	printf("%f", L);

	return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'scanf_s' was not declared in this scope; did you mean 'scanf'?
    8 |         scanf_s("%lf", &R);
      |         ^~~~~~~
      |         scanf
Language: C

#include<iostream>
#include<algorithm>
#include<vector>
#include<map>
#include<cmath>
#include<string>
#include<bitset>
#include <sstream>
#include<queue>
#include<stack>
#include<iomanip>
#include<functional>
#define rep(i,n) for(ll i=0;i<(n);++i)
#define sayyes cout<<"Yes"<<endl;
#define sayno cout<<"No"<<endl;
using namespace std;
typedef long long ll;
typedef pair<int,int>P;
const int mod =1e9+7;

int main()
{
    int n;
    cin>>n;
    cout<<(double)(2.0*n*3.1415);
    
}


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

import java.util.Scanner;


public class Cycle1 {
 public static void main(String[]args){
  final double PI = 3.141592;
  Scanner stdIn = new Scanner(System.in);

  System.out.println("半径：");
  double r = stdIn.nextDouble();//半径

  System.out.println(2 * PI * r );

 }
}

Compiler output:
Main.java:4: error: class Cycle1 is public, should be declared in a file named Cycle1.java
public class Cycle1 {
       ^
1 error
Language: C

N=int(input())

print('{:.8f}'.format(N*3.14*2))

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | N=int(input())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
main.c:1:3: error: expected expression before 'int'
    1 | N=int(input())
      |   ^~~
main.c:3:7: warning: multi-character literal with 6 characters exceeds 'int' size of 4 bytes
    3 | print('{:.8f}'.format(N*3.14*2))
      |       ^~~~~~~~
Language: C

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

int main()
{
	int r;
	cin>>r;
	cout<<r*6.28<<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>
#include<iostream>
#include<string.h>
#include<math.h>
using namespace std;
int main()
{
    float a,b[10000],c=0,e,d,i,j=0;
    cin>>a;
    e=6.28318530717958623200*a;
    cout<<e<<endl;

}


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

#include<stdio.h>

#define PAI  3.14159265358979323846264338327950288 ;

int main(){
  int r;
  float shy;
  scanf("%d",&r);
  shy = 2*r*PAI;
  print("%f\n",shy);

  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:3: error: implicit declaration of function 'print'; did you mean 'printf'? [-Wimplicit-function-declaration]
   10 |   print("%f\n",shy);
      |   ^~~~~
      |   printf
Language: C

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

int main(){
	int R;
	cin>> R;
	double ans = 2 * M_PI * R;
       	cout << setprecision(6) << ans << endl;	
}

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

int n = 0;

cin>>n;
float ans = n*3.14159265358;
cout>>ans;

Compiler output:
a.cc:3:1: error: 'cin' does not name a type
    3 | cin>>n;
      | ^~~
a.cc:5:1: error: 'cout' does not name a type
    5 | cout>>ans;
      | ^~~~
Language: C

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

int main()
{
	long double r,pai=3.14159265358979323846;
	cin >> r;
	long double c;
	c = 2*r*pai;
	cout<<c;
	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

PI = 3.14
R =int(input())
diameter = 2 * R
circumference = 2 * PI * R
print(float( PI * 2 * R))

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | PI = 3.14
      | ^~
main.c:1:1: error: type defaults to 'int' in declaration of 'PI' [-Wimplicit-int]
main.c:2:1: error: expected ',' or ';' before 'R'
    2 | R =int(input())
      | ^
Language: C

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

int main() {
  int r;
  cin >> r;
  double l = r*3.14;
  cout << l << 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 <iostream>
 
using namespace std;
 
int main () {
  long double a;
  cin>>a;
  answer long double=answer*2*(3.14159);
  cout<<answer;
  
  
}  

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'answer' was not declared in this scope
    8 |   answer long double=answer*2*(3.14159);
      |   ^~~~~~
Language: C

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

int main()
{

int R;
cin >> R;  
   
cout << 2 * 3.1415926535 * 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;
typedef long long ll;
ll gcdEx(ll a, ll b, ll *x, ll *y) {
  if (!a) {*x = 0; *y = 1; return b;}
  ll x1, y1, gcd = gcdEx(b % a, a, &x1, &y1); *x = y1 - (b / a) * x1; *y = x1; return gcd;
}
ll modI(ll b, ll m)      {ll x, y; gcdEx(b, m, &x, &y); return (x % m + m) % m;}
typedef pair<ll, ll>      pii;
typedef vector<ll>         vi;
typedef vector<pii>         vii;
typedef set<ll>            si;
typedef map<string, ll>    msi;
#define all(x) (x).begin(), (x).end()
#define make_unique(x) sort(all((x))); (x).resize(unique(all((x))) - (x).begin())
#define loop(i,b,n)           for(ll i=b;i<n;i++)
#define loopv(i,b,n,a)         for(ll i=b;i<n;i+=a)
#define loopr(i,b,n)           for(ll i=n;i>=0;i--)

#define sum(a)     ( accumulate ((a).begin(), (a).end(), 0ll))
#define mine(a)    (*min_element((a).begin(), (a).end()))
#define maxe(a)    (*max_element((a).begin(), (a).end()))
#define mini(a)    ( min_element((a).begin(), (a).end()) - (a).begin())
#define maxi(a)    ( max_element((a).begin(), (a).end()) - (a).begin())
#define lowb(a, x) ( lower_bound((a).begin(), (a).end(), (x)) - (a).begin())
#define uppb(a, x) ( upper_bound((a).begin(), (a).end(), (x)) - (a).begin())

#define start_routine() ll begtime = clock();
#define end_routine() ll endtime = clock(); \
                      cerr << "\n\n" << "Time elapsed: " << \
                      (endtime - begtime)*1000/CLOCKS_PER_SEC << " ms\n\n"; \
                      return 0
#define mp                  make_pair
#define ff                  first
#define ss                  second
#define pb                  push_back
#define MOD                 1000000007
#define modA(a,b)           (((a%MOD)+(b%MOD))%MOD)
#define modS(a,b)           (((((a%MOD)-(b%MOD))%MOD)<0)?(ll)(MOD+((a%MOD)-(b%MOD))%MOD):(ll)(((a%MOD)-(b%MOD))%MOD))
#define modM(a,b)           (ll)((((ll)(a))*((ll)(b)))%MOD)
#define modD(a,b)           ((modI(b,MOD)*(a%MOD))%MOD)
ll modP(ll x, ll y)         {
  ll r = 1; x %= MOD; while (y > 0) {
    if (y & 1) {r = (r * x) % MOD;}
    y = y >> 1; x = (x * x) % MOD;
  } return r;
}

#define trace(x) cerr<<#x<<"="<<x<<endl;
#define trace2(x,y) cerr<<#x<<"="<<x<<" || "<<#y<<"="<<y<<endl;
ll max(ll a, ll b) {return (a > b ? a : b);}
ll min(ll a, ll b) {return (a < b ? a : b);}
int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL); cout.tie(NULL);
  ll t;
// cin >> t;
  t = 1;
  for (ll tt = 1; tt <= t; tt++)
  {
    double ans = 0;

    //  cout << "Case #" << tt << ": ";

    double pi = acos(-1), r;
    cin >> r;
    ans = 2 * pi * r;
    cout << setprecision(16) << 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<iostream>
using namespace std;

int main() {
	int R;
	cin >> R;
	R = R * 2;

	double S;
	S =  R* 3.1415926535;

	cout << S << endl;

}

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

import math

def solve(r):
    c = 2 *math.pi * r
    print('%.7f'%c)

r = int(input())
solve(r)


Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'def'
    3 | def solve(r):
      | ^~~
main.c:3:1: error: unknown type name 'def'
main.c:5:11: warning: multi-character character constant [-Wmultichar]
    5 |     print('%.7f'%c)
      |           ^~~~~~
Language: C

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

int main() {
  int r;
  cin >> r;
  cout << (double)r*22/7 << 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 <iostream>
using std;

int main(){
  int r;
  const float PI = 3.14;
  cin>>r;
  cout<<(2*PI*r);
  return 0;
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'std'
    2 | using std;
      |       ^~~
a.cc: In function 'int main()':
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   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:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout<<(2*PI*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

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

int main() {

  double A;
  cin >> A;
  double x = 2*A* M_PI; 
  
  printf("%.5lf", x);
}

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;
  double d = 3.14;
  cin >> R;
  cout << 2*R*d << 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;
int main()
{
    // 整数の入力
    int N;
    cin >> N;
    // スペース区切りの整数の入力
    int sum[N] = {0};
    int a;

    for (int i = 0; i<N-1; i++){
        cin >> a;

        sum[a-1] += 1;
        
    }
    
    for (int i = 0; i<N; i++){
        cout << sum[i] << 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;

int main(){
  double R;
  cin >> R;
  cout << R*2*3.14159265358979323 << 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

import math as m

r=int(input())
print(2*m.pi*r)

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math as m
      | ^~~~~~
main.c:1:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'as'
    1 | import math as m
      |             ^~
main.c:1:13: error: unknown type name 'as'
Language: Java

import java.util.Scanner;
public class
{
   static Scanner sc = new Scanner(System.in);
   public static void main(String args[])
   {
      System.out.print("Enter the radius: ");
      double radius = sc.nextDouble();
      double area = Math.PI * (radius * radius);
      System.out.println("The area of circle is: " + area);
      double circumference= Math.PI * 2*radius;
      System.out.println( "The circumference of the circle is:"+circumference) ;
   }
}

Compiler output:
Main.java:2: error: <identifier> expected
public class
            ^
1 error
Language: C

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

int main()
{

int R;
cin >> R;  
   
cout << 2 * R * 3.1415926535 << 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<iostream>
using namespace std;

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

	double S = 2 * R* 3.1415926535;

	cout << S << 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;

void main()
{
int R=0;
int S;
 cin >> R;
  S = ( R + R ) * 3.14; 
}
cout << S;

Compiler output:
a.cc: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: C

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

int main() {
 int R;
  cin >> R;
  cout << 2*3.141592653589793238*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

N=int(input())
print(N*3.14*2)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | N=int(input())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
main.c:1:3: error: expected expression before 'int'
    1 | N=int(input())
      |   ^~~
Language: C

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

int main() {
  double R;
  cin >> R;
  cout << 2 * R * 3.1415926535 << 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 << (double)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: C

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


/// File input & output /////
#define fRead(x)        freopen("x.txt","r",stdin)
#define fWrite(x)       freopen ("x.txt","w",stdout)

#define mt              make_tuple
#define ld              long double
#define ll              long long
#define ull             unsigned long long
#define ff              first
#define ss              second
#define pb              push_back
#define INF             2e16
#define PI              acos(-1.0)
#define mp              make_pair
#define pii             pair<int,int>
#define pll             pair<LL,LL>


#define min3(a,b,c)     min(a,min(b,c))
#define max3(a,b,c)     max(a,max(b,c))
#define min4(a,b,c,d)   min(a,min(b,min(c,d)))
#define max4(a,b,c,d)   max(a,max(b,max(c,d)))
#define SQR(a)          ((a)*(a))
#define FOR(i,a,b)      for(int i=a;i<=b;i++)
#define ROF(i,a,b)      for(int i=a;i>=b;i--)
#define REP(i,b)        for(int i=0;i<b;i++)
#define MEM(a,x)        memset(a,x,sizeof(a))
#define ABS(x)          ((x)<0?-(x):(x))

#define SORT(v)         sort(v.begin(),v.end())
#define REV(v)          reverse(v.begin(),v.end())


#define FASTIO        ios_base::sync_with_stdio(0);cin.tie(nullptr);




///..................Sort by second element in a pair in decending order............. ///
bool SortbySecDesc(const pair<long long,long long > &a, const pair<long long,long long > &b)
{
    return a.second>b.second;
}

///.........................first element of pair in descending order..........................//////
bool sortinrev(const pair<int,int> &a,
               const pair<int,int> &b)
{
       return (a.first > b.first);
}



///.............................................................TEMPLATE................................................./////

int main()
{
    FASTIO;

    int t;

    cin >> t;

    cout << setprecision(15) << 2*PI*t << 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()
{
	double r;
	cin >> r;
	cout << (double)2*3.142*r << 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;

#define minv(v) *min_element(v.begin(),v.end())
#define maxv(v) *max_element(v.begin(),v.end())
#define unq(v) sort(v.begin(),v.end()),v.erase(unique(v.begin(),v.end()),v.end())
#define ll long long
#define pb push_back
#define fill(arr) memset(arr,0,sizeof(arr))
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (a*(b/gcd(a,b)))
#define pi acos(-1.00)
#define _ios ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int main()
{
    _ios;
    ll r;
    cin>>r;
    cout<<2*pi*r<<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 << 2 * R * 3.14159 << 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 <iostream>
#include <algorithm>
#include <functional>
#include <vector>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <string>
#include <numeric>
#include <cmath>

#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;
typedef long long ll;
typedef vector<int> vec;
typedef vector<vector<int>> mat;
using P = pair<ll, ll>;

template<class T> inline bool chmin(T& a,T b) {if (a > b) {a = b; return true;} return false;}
template<class T> inline bool chmax(T& a,T b) {if (a < b) {a = b; return true;} return false;}

const ll MOD = 1000000007;
const int INF = 1<<29;
#define PI 3.14159265359

int main(){
  double R; cin >> R;
  printf("%.6f", 2 * PI * R);
}


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

#include<iostream>
using std;

int main(){
  int r;
  const float PI = 3.14;
  cin>>r;
  cout<<(2*PI*r);
  return 0;
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'std'
    2 | using std;
      |       ^~~
a.cc: In function 'int main()':
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   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:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout<<(2*PI*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

#include<bits/stdc++.h>
using namespace std;
double r, pi = 3.1415926, c;
int read()
{
  int x = 0, w = 1;
  char ch = 0;
  while (ch < '0' || ch > '9') {
    if (ch == '-') w = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    x = x * 10 + (ch - '0');
    ch = getchar();
  }
  return x * w;
}
inline void write(int x)
{
  static int sta[35];
  int top = 0;
  do {
    sta[top++] = x % 10, x /= 10;
  } while (x);
  while (top) putchar(sta[-- top] + 48);
}
int main()
{
    r = read();
    c = 2 * r * pi;
    printf("%.3f", c);
    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 << 6.282*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

/**
 * Dont raise your voice, improve your argument.
 * --Desmond Tutu
 */

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

vector<string> vec_splitter(string s) {
    for(char& c: s) c = c == ','?  ' ': c;
    stringstream ss; ss << s;
    vector<string> res;
    for(string z; ss >> z; res.push_back(z));
    return res;
}

void debug_out(vector<string> __attribute__ ((unused)) args, __attribute__ ((unused)) int idx) { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(vector<string> args, int idx, Head H, Tail... T) {
    if(idx > 0) cerr << ", ";
    stringstream ss; ss << H;
    cerr << args[idx] << " = " << ss.str();
    debug_out(args, idx + 1, T...);
}

#ifdef XOX
#define debug(...) debug_out(vec_splitter(#__VA_ARGS__), 0, __VA_ARGS__)
#else
#define debug(...) 42
#endif

const double PI = acos(-1);
typedef long long ll;
#define int ll
#define fori(n) for(int i=0; i<int(n); i++)

#define cins(s) string s; cin>>s;
#define cini(i) int i; cin>>i;
#define cind(d) double d; cin>>d;
#define cinai(a, n) vi a(n); fori(n) { cin>>a[i]; }
#define cinas(s, n) vs s(n); fori(n) { cin>>s[i]; }
#define cinad(a, n) vd a(n); fori(n) { cin>>a[i]; }

typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef vector<double> vd;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<string> vs;

void solve() {
    cini(r);
    cout<<setprecision(12)<<fixed<<2*r*PI<<endl;
}

signed main() {
    cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    solve();
}



Compiler output:
main.c:6:10: fatal error: bits/stdc++.h: No such file or directory
    6 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

#define FASTIO  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long int
#define ld long double
#define vll vector<ll>
#define pll pair<ll,ll>
#define vl(p) vector<p>
#define w while
#define For(i,s,x) for(i=s;i<x;i++)
#define Fore(i,s,x) for(i=s;i<=x;i++)
#define FOR(i,x) for(i=0;i<x;i++)
#define Rof(i,s,x) for(i=s;i>=x;i--)
#define all(v) v.begin(),v.end()
#define it(r,v) for(auto r=v.begin();r!=v.end();r++)
#define pb push_back
#define in insert
#define sz size()
#define F first
#define S second
#define nl cout<<"\n"
#define pr(a) cout<<a<<" "
#define pr2(a,b) cout<<a<<" "<<b<<"\n"
#define pr3(a,b,c) cout<<a<<" "<<b<<" "<<c<<"\n"
#define mod 1000000007

int main()
{
	FASTIO;
	int r;
	cin>>r;
	ld a;
	a=2*3.141592653589793238*r;
	cout<<a<<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 main {
	static int R;
	static double L;
	public static void main(String args[]){
		Scanner scanner =new Scanner(System.in);
		System.out.println("R");
		R=scanner.nextInt();
		L=R*2*Math.PI;
		System.out.println(L);
	}
}


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

public class Circle {

	public static void main(String[] args) {
		int R = new java.util.Scanner(System.in).nextInt();
		double e = Math.PI * R * 2;
		System.out.println(e);
	}

}


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

# include <iostream>

using namespace std;

int main () {
  long double a;
  cin>>a;
  answer=answer*2(3.14159);
  cout<<answer;



}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'answer' was not declared in this scope
    8 |   answer=answer*2(3.14159);
      |   ^~~~~~
a.cc:8:18: error: expression cannot be used as a function
    8 |   answer=answer*2(3.14159);
      |                 ~^~~~~~~~~
Language: C

#include <algorithm>
#include <bits/stdc++.h>
#include <unordered_map>
#include <unordered_set>
using namespace std;
#define mod (int)1000000007
// Big two primes 
#define X 1011001110001111ll
#define M 26388279066623ll
#define all(a) a.begin(),a.end()
#define for0(i, n) for (int i = 0; i < n; i++)
#define for1(i, n) for (int i = 1; i <= n; i++)
#define loop(i,a,b) for (int i = a; i < b; i++)
#define bloop(i,a,b) for (int i = a ; i>=b;i--)
#define tc(t) int t; cin >> t; while (t--)
#define int int
#define ll long long
#define pb emplace_back
#define fio ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL)
#define in(x) scanf("%d", &x)
#define rr return 0
#define prec(n) fixed<<setprecision(n)
#define maxpq priority_queue<int>
#define minpq priority_queue<int, vector<int>, greater<int> >
#define inf (int)(1e18)
#define ini(a, i) memset(a, i, sizeof(a))
#define vi vector<int> 
#define fi first
#define se second
#define endl "\n"
#define pi pair<int, int>
#define vii vector<pi>
const int MAXN = (int)((1e5) + 10);
int gcd(int a,int b) { if (a == 0) return b; return gcd(b%a, a);}
int max(int a,int b){if(a>b) return a; else return b;}
int min(int a,int b){if(a<b) return a; else return b;}  
bool isPrime(int N){ for(int i=2;i*i<=N;++i){if(N%i==0) return false;}return true;}
int cbrt(int x){ int lo=1,hi=min(2000000ll,x);while(hi-lo>1){int mid=(lo+hi)/2;if(mid*mid*mid<x){lo=mid;}else hi=mid;}if(hi*hi*hi<=x) return hi;else return lo;} 
bool compare(const pair<int, int> &a, const pair<int, int> &b)
{
  return (a.second < b.second);
}
int main()
{
    fio;
 
    int r;
    cin>>r;

    double d = 2 * (3.14) * r;

    cout<<d<<endl;
    rr;
}

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

#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;

int main() {
  ll r;
  cin >> r;
  cout << 2*r*3.141592653589793 << 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;
int main()
{
    // 整数の入力
    int N;
    cin >> N;
    // スペース区切りの整数の入力
    int sum[N] = {0};
    int a;

    for (int i = 0; i<N-1; i++){
        cin >> a;

        sum[a-1] += 1
        
    }
    
    for (int i = 0; i<N; i++){
        cout << sum[i] << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:22: error: expected ';' before '}' token
   15 |         sum[a-1] += 1
      |                      ^
      |                      ;
   16 | 
   17 |     }
      |     ~
Language: C

#include<bits/stdc++.h>
#define ll long long
#define REP(i,a,n) for(ll i=a;i<(n);i++)
#define RE return
using namespace std;
int main()
{
    ios::sync_with_stdio(0);
    long double n;
    cin>>n;
    cout<<n*3.14;
    RE 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;
        double p=2*3.1416*r;
        cout.precision(2);
        cout<<fixed<<p<<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;
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
int main() {
  int r;
  cin >> r;
  const double p = 3.14159265358979323846;
  cout <<2*r*p<<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

using System;


    class Program
    {
        static void Main(string[] args)
        {

		// 整数の入力
		float a = float.Parse(Console.ReadLine());
		
		// スペース区切りの整数の入力
		float b = a * 2f * 3.14159f;
		
		//出力
		Console.WriteLine(b);

        }
    }


Compiler output:
main.c:1:1: error: unknown type name 'using'
    1 | using System;
      | ^~~~~
main.c:4:5: error: unknown type name 'class'
    4 |     class Program
      |     ^~~~~
main.c:5:5: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    5 |     {
      |     ^
main.c:13:31: error: invalid suffix "f" on integer constant
   13 |                 float b = a * 2f * 3.14159f;
      |                               ^~
Language: C

#include<iostream>

using namespace std;

int main()
{
  
  double r;cin>>r;
  cout<<2*3.141592654*r<<endl;
  
  
  
  
  
  
  return 0;
}

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

import java.util.Scanner;

public class main {
	static int R;
	static double L;
	public static void main(String args[]){
		Scanner scanner =new Scanner(System.in);
		System.out.println("R");
		R=scanner.nextInt();
		L=R*2*3.141592653589793238462643383279;
		System.out.println(L);
	}
}


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

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

int main() {
  int R;
  cin >> R;
  cout << 3.1415 * 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<stdio.h>
 
int main()
{
  int a;
  float b;
  scanf(%d,&a);
  if(1<=a<=100){
    b=a*a*3.1415;
    printf("%f",b);
  }
else{
  printf("dame");
}
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:9: error: expected expression before '%' token
    7 |   scanf(%d,&a);
      |         ^
Language: C

R=10

puts (#{R} * 2 * 3.14)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | R=10
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'R' [-Wimplicit-int]
main.c:3:1: error: expected ',' or ';' before 'puts'
    3 | puts (#{R} * 2 * 3.14)
      | ^~~~
main.c:3:7: error: stray '#' in program
    3 | puts (#{R} * 2 * 3.14)
      |       ^
main.c:3:14: error: expected identifier or '(' before numeric constant
    3 | puts (#{R} * 2 * 3.14)
      |              ^
Language: C

#include<bits/stdc++.h>
using namespace std;
double i,R;
int main()
{
    cin>>R;
    i=R*3.14*2;
    cout<<i;
}


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 <iomanip>
#define PI 3.14159265359
using namespace std;
int main() {
    int R;
    cin >> R;
    double L;
    L = 2.0 * PI * R;
    cout << fixed << setprecision(15) << L << 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 <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cstring>
#include <vector>
#include <map>
#include <algorithm>
#include <cctype>
#include <cmath>
#include <bitset>
#include <set>
#include <stack>
using namespace std;

#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define RREP(i,n) for(int i=n-1;i>=0;i--)
#define FOR(i,k,n) for(int i=(k);i<(int)(n);i++)
#define all(i,n) (i),(i+n)

int dx4[4]={1,0,-1,0};
int dy4[4]={0,-1,0,1};
int dx8[8]={1,0,-1,1,-1,1,0,-1};
int dy8[8]={1,1,1,0,0,-1,-1,-1};
int dx9[9]={0,1,0,-1,1,-1,1,0,-1};
int dy9[9]={0,1,1,1,0,0,-1,-1,-1};

typedef pair<int, int> P;
typedef pair<string, int> SP;
typedef long long ll;
typedef pair<ll, ll> PLL;

const int INF = 1e9;
const ll LLINF = 1e18;
const int MAX_V = 1e6+1;
const ll mod = 1000000007;

// --------------------------------------
double n;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  cin >> n;

  cout << fixed << setprecision(2) << (n * 2.0 * 3.14159) << endl;
}


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

#include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <list>
#include <algorithm>
#include <set>
#include <queue>

using namespace std;
#define ll long long

int main()
{
    int t=1;
    //cin>>t;
    while (t--)
    {
        double n;
        scanf("%lf", &n);
        printf("%.6lf\n", 2*3.1416*n);
    }
    
    return 0;
}
/*

riaadmorshed@gmail.com

*/
/*
4
7 5 3
6 1 1
6 6 1
5 2 2
*/


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

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

int main() {
  long long R;
  cin >> R;
  cout << 2 * R * M_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 <bits/stdc++.h>
using namespace std;

int main(){
    int r;
    cin >> r;
    cout << r*3.1415;
    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>
using namespace std;
 
int main() {
	// your code goes here
	int r;
	cin >> r;
   
    long double res = 2 * r ;
	
	cout << fixed << setprecision(20) 
	     << res*3.14159265358979323846 << endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:26: error: 'setprecision' was not declared in this scope
   12 |         cout << fixed << setprecision(20)
      |                          ^~~~~~~~~~~~
a.cc:3:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    2 | #include <math.h>
  +++ |+#include <iomanip>
    3 | using namespace std;
Language: C

#include<bits/stdc++.h>
using namespace std;
int main()
{
	float r;cin>>r;
	float a;
	a=3.14159*r*2;
	cout<<a<<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: Java

import java.util.Scanner;
public class Main
{
    publiv static void main(String Args[])
    {
        Scanner sc=new Scanner (System.in);
        int n=sc.nextInt();
        double c=Math.PI*n;
        System.out.println(c);
    }
}

Compiler output:
Main.java:4: error: <identifier> expected
    publiv static void main(String Args[])
          ^
1 error
Language: C

#include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <list>
#include <algorithm>
#include <set>
#include <queue>

using namespace std;
#define ll long long

int main()
{
   // ios_base::sync_with_stdio(false);
    //cin.tie(NULL);
    //freopen("aa_input.txt", "r", stdin);
    int t=1;
    //cin>>t;
    while (t--)
    {
        int n;
        cin>>n;
        printf("%.6lf\n", 2*3.1416*n);
    }
    
    return 0;
}
/*

riaadmorshed@gmail.com

*/
/*
4
7 5 3
6 1 1
6 6 1
5 2 2
*/


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

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    double r,up=3.141592;
    cin>>r;
    cout<<(up)*r+(up)*r<<endl;
    return 0;
}


Compiler output:
main.c:3:9: fatal error: bits/stdc++.h: No such file or directory
    3 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
int main(void){
  int R;
  cin>>R;
  cout<<2*R*3.1415926<<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 <iostream>

void funcA() {
 
  int r;
  std::cin >> r;
  std::cout << (float)(r * 3.1415 * 2);

}

int main(void) {
  funcA();
  return 0;
}

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")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
#define all(x) x.begin(),x.end()
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=1e5+50;
const ll mod=1e9+7;
using namespace std;
ld r;
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>r;
	cout<<fixed<<setprecision(10)<<2*acos(-1)*r<<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.
Language: C

#include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <list>
#include <algorithm>
#include <set>
#include <queue>

using namespace std;
#define ll long long

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen("aa_input.txt", "r", stdin);
    int t=1;
    //cin>>t;
    while (t--)
    {
        int n;
        cin>>n;
        printf("%.6lf\n", 2*3.1416*n);
    }
    
    return 0;
}
/*

riaadmorshed@gmail.com

*/
/*
4
7 5 3
6 1 1
6 6 1
5 2 2
*/


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

#include <bits/stdc++.h>
using namespace std;
int main(){
int r;
cin >> r;
cout << r*2*3.1415
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>
constexpr auto M_PI = 3.14159265358979323846;
using namespace std;
int main()
{
    int r;
    cin>>r;
    double result = 2*M_PI*r;
    cout<< fixed << setprecision(2)<< result << endl;
}


Compiler output:
In file included from /usr/include/c++/14/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:114,
                 from a.cc:1:
a.cc:2:16: error: expected unqualified-id before numeric constant
    2 | constexpr auto M_PI = 3.14159265358979323846;
      |                ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int n , m , sum = 0 ;
  std::cin >> n >> m;
  for(int i=0; i =< m; i++) {
    int a;
    std::cin >> a;
    sum += a;
  } 
  if ( n >= m ){
	n -= sum ; 
    cout << n << endl ;
  }
  else
    cout << -1 << endl ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:19: error: expected primary-expression before '<' token
    7 |   for(int i=0; i =< m; i++) {
      |                   ^
Language: C

#include<iostream>
using namespace std;


int main() {
	const double PI = 3.14159265358979323846;
	double R;
	cin >> R;
	cout << R * 2 * PI << 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;

int main() {
  int R;
  cin >> R;
  cout << 2*R*3.14159265358979 << 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 <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <list>
#include <algorithm>
#include <set>
#include <queue>

using namespace std;
#define ll long long

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    freopen("aa_input.txt", "r", stdin);
    int t=1;
    //cin>>t;
    while (t--)
    {
        double n;
        cin>>n;
        printf("%.6lf\n", 2*3.1416*n);
    }
    
    return 0;
}
/*

riaadmorshed@gmail.com

*/
/*
4
7 5 3
6 1 1
6 6 1
5 2 2
*/


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

/*
 * @Author: Luisvacson
 * @LastEditors: Luisvacson
 * @Descriptions: None
 * @Date: 2020-04-19 20:43:14
 * @LastEditTime: 2020-04-19 20:46:28
 * @FilePath: \VSC\C++\Practice\AC abc163 A.cpp
 */
#include<bits/stdc++.h>
using namespace std;
#define Pi 3.14159265358979323846

signed main(){
    long double R;
    cin>>R;
    cout<<Pi*R*2<<'\n';

    return 0;
}

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

#include <cstdio>
#include <utility>
#include <vector>
using namespace std;
typedef long long int ll;

void solve()
{
	double r; 
	cin >> r;
	cout << 3.1415926535 * 2 * r;
}
int main()
{
//	int t;
//	cin >> t;
//	while (t-- > 0)
		solve();
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:10:9: error: 'cin' was not declared in this scope
   10 |         cin >> r;
      |         ^~~
a.cc:4:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include <vector>
  +++ |+#include <iostream>
    4 | using namespace std;
a.cc:11:9: error: 'cout' was not declared in this scope
   11 |         cout << 3.1415926535 * 2 * r;
      |         ^~~~
a.cc:11:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

a=float(input())
b=2*3.14.a
print(b)

Compiler output:
a.cc:2:5: error: too many decimal points in number
    2 | b=2*3.14.a
      |     ^~~~~~
a.cc:1:1: error: 'a' does not name a type
    1 | a=float(input())
      | ^
Language: C

#include <iostream>

int main() {
    int R;
    std::cin >> R;
    double L;
    L = 2 * 3.14 * R;
    std::cout << L << std::endl;
    return 0;
}


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

import java.util.*;
public class Main{

	public static void main(String[]args){
    	Scanner sc=new Scanner(System.in);
      	int t=sc.nextInt();
      	System.out.println(t*6.28318530717958623200)
    
    
    }

}


Compiler output:
Main.java:7: error: ';' expected
      	System.out.println(t*6.28318530717958623200)
      	                                            ^
1 error
Language: C

#include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <list>
#include <algorithm>
#include <set>
#include <queue>

using namespace std;
#define ll long long

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    freopen("aa_input.txt", "r", stdin);
    int t=1;
    //cin>>t;
    while (t--)
    {
        int n;
        cin>>n;
        printf("%.6lf\n", 2*3.1416*n);
    }
    
    return 0;
}
/*

riaadmorshed@gmail.com

*/
/*
4
7 5 3
6 1 1
6 6 1
5 2 2
*/


Compiler output:
main.c:2:10: fatal error: iostream: No such file or directory
    2 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.