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

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll,ll> l_l;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
const int INF=1001001000;
const int mINF=-1001001000;
const ll LINF=1010010010010010000;
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;
}
//グリッド：（典型）dp,dfs,bfs,最短経路,その他
const ld PI=3.141592;
int main(){
    ld r;cin>>r;
    cout<<fixed<<setprecision(10);
    cout<<2*r*PI<<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 int long long
#define fi first
#define se second
#define pb push_back
#define pr pair<int,int>
#define mod 1000000007
#define endl "\n"

int power(int a,int b,int m=mod)
{
	if(b==0)	return 1;
	if(b==1)	return a;
	int res=power(a,b/2,m);
	res=(res*res)%m;
	if(b&1)	res=(res*a)%m;
	return res;
}

int modinv(int a){ return power(a,mod-2);}

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

int32_t main()
{
	ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
	int t=1;//cin>>t;
	while(t--)	solve();
	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 For(i,m,n) for(int i=m;i<n;i++)
#define FOR(i,n) for(int i=0;i<n;i++)
#define ll long long
#define ull unsigned long long
#define lli long long int
#define pb push_back
# define M_PI           3.14159265358979323846  /* pi */
ll mob=1000000007;
using namespace std;
int main()
{ 

int r;cin>>r;
cout<<fixed<<setprecision(20);
cout<<(double)2*M_PI*r;


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>
#include <vector>
#include <algorithm>
#include <string>
#include <set>
#include <queue>
#include <stack>
#include <tuple>
#include <cmath>
#include <iomanip>
#include <map>
#include <stdio.h>
#include <cstring> //memset(dp,0,sizeof(dp))
#include <functional> //operator[]
#define ll long long
#define rep(i,n) for(int i=0;i<(n);i++)
#define rrep(i,n) for(int i=n-1;i>=0;i--)
#define fi first
#define se second
#define pb push_back
#define ALL(a) (a).begin(),(a).end()
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
typedef pair<int,int> P;
typedef pair<ll,ll> Pll;

signed main(){
    double r; cin >> r;
    double num =r*3.1415926*2;
    cout << fixed << setprecision(10) << num << endl;
}



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>
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define sz(x)  (long long)(x).size()
#define sqr(x) (x)*(x)
#define sof sizeof
#define ins insert
#define lowerB lower_bound
#define upperB upper_bound
#define mkp make_pair
#define mod 1000000007
#define mod1 998244353
#define N 100003
#define inf 1e18
#define minf -1e18
#define min3(a,b,c) min(a,min(b,c));
#define max3(a,b,c) max(a,max(b,c));
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define FastIO ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define PRECISION std::cout.unsetf ( std::ios::floatfield );std::cout.precision(15)
#define PI M_PI
#define fi first
#define se second
#define here cout<<"RSSB"<<endl
#define showzero cout<<std::showpoint
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (a*b)/gcd(a,b)
#define br "\n"
using namespace  std ;
typedef double db;
typedef long long ll ;
typedef vector<int>vi ;
//typedef vector<l>vl ;
typedef vector<ll>vll ;
typedef vector<vector<ll> >vvl ;
typedef pair<int,int> pii ;
typedef pair<ll,ll> pll ;
typedef vector<pll>vpll;
typedef vector<string>vstr;
typedef vector<bool>vbool ;
/*vbool isprime(N,true);
vll spf(N,0);
vll prime;
void sieve()
{
    isprime[0] = isprime[1] = false;
    for(ll i = 2 ; i<N ; i++)
    {
        if(isprime[i])
        {
            for(ll j=2*i ; j<N ; j+=i)
            {
                isprime[j] = false;
                if(spf[j]==0)
                {
                    spf[j] = i;
                }
            }
            prime.pb(i);
        }
    }
}*/
ll nck(ll n , ll k ,ll m=1e18+7)
{
    ll i , j,b=1,c=1 ;
    if(n-k<k)
    {
        k = n-k ;
    }
    while(k)
    {
        b*=n ;
        c*=k ;
        ll g = __gcd(b,c) ;
        b/=g ;
        c/=g ;
        n--;
        k-- ;
    }
    return(b) ;
}
long long power(long long k , long long n , long long m=mod)
{
    long long res = 1;
    while(n)
    {
        if(n%2!=0)
        {
            res = (res*k)%m ;
        }
        k = (k*k)%m ;
        n = n/2 ;
    }
    return(res) ;
}
void READ(vll &v, ll n)
{
    ll a ;
    for(ll i=0 ; i<n ; i=i+1)
    {
        cin>>a ;
        v.pb(a) ;
    }
}
void PRINT(vll &v , ll a = 0)
{
    //ll a ;
    for(ll i=a ; i<v.size() ; i=i+1)
    {
        v[i] = max((ll)0,v[i]);
        cout<<v[i]<<" " ;
    }
    cout<<"\n" ;
}
ll n,m,k;
bool ok = true;
int main()
{
    FastIO ;
    PRECISION ;
    ll a,b,c,d,e,i,j,t,x,y,z,x1,y1,z1,f;
    //double p,q,r,u,w ;
    char ch,chr ;
    //string str,st,str2,str3;
    //ll a1=0,a2=0,b1=0,b2=0,c1=0 ;
    //cin>>str>>str1;
    cin>>n;
    showzero;
    cout<<(db)2*PI*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: C

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
const double pi=atan(1.0)*4;
int r;
void solve(){
    cout<<2*pi*r<<endl;
}

int main(){
    cin>>r;

    solve();
    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++

n=int(input()) #Pythonの標準入力
ans=n*6.28
print(ans)

Compiler output:
a.cc:1:16: error: stray '#' in program
    1 | n=int(input()) #Pythonの標準入力
      |                ^
a.cc:1:1: error: 'n' does not name a type
    1 | n=int(input()) #Pythonの標準入力
      | ^
Language: C

#include <iostream>
#include <iomanip>
#include <vector>
#include <set>
#include <string>
#include <queue>
#include <algorithm>
#include <map>
#include <cmath>
#include <numeric>
#include <list>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <tuple>

#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep1(i, n) for (int i = 1; i <= (n); i++)
#define show(a, n) rep(i,n) {cout<<a[i]<<' ';} cout<<endl
#define show2(a, n, m) rep(i, n) { rep(j, m) {cout << a[i][j] << ' ';} cout << endl;} 
#define chmin(a, b) a = min(a, b)
#define chmax(a, b) a = max(a, b)

using namespace std;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<long long, long long> pll;
typedef long double ld;

const int INF = 1 << 30;
const long long INFL = 1LL << 60;
const int MOD = 1000000007;
const int MAX = 100000;
const int N = 100010;

int main() {
	cout << fixed << setprecision(15);
	const ld pi = 3.14159265;
	ld r;
	cin >> r;
	cout << 2 * r * pi << endl;
}


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;
# define M_PI           3.14159265358979323846  /* pi */
int main()
{
    int r;
    cin>>r;
    cout<<2*(M_PI)*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;

int main() {
  int R;
  cin>>R;
  cout<<2*R*M_PI<<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;
#define FOR(var, begin, end) for (int var = (begin); var <= (end); var++)
#define RFOR(var, begin, end) for (int var = (begin); var >= (end); var--)
#define REP(var, length) FOR(var, 0, length - 1)
#define RREP(var, length) RFOR(var, length - 1, 0)
#define EACH(value, var) for (auto value : var)
#define SORT(var) sort(var.begin(), var.end())
#define REVERSE(var) reverse(var.begin(), var.end())
#define RSORT(var) \
  SORT(var);       \
  REVERSE(var)
#define OPTIMIZE_STDIO         \
  ios::sync_with_stdio(false); \
  cin.tie(0);                  \
  cout.precision(10);          \
  cout << fixed
#define endl '\n'

const int INF = 1e9;
const ll MOD = 1e9 + 7;
const ll LINF = 1e18;
struct mint {
  ll x;
  mint() : x(0) {
  }
  mint(ll x) : x((x % MOD + MOD) % MOD) {
  }
  mint& operator+=(const mint& r) {
    if ((x += r.x) >= MOD) {
      x -= MOD;
    }
    return *this;
  }
  mint& operator-=(const mint& r) {
    if ((x -= r.x) < 0) {
      x += MOD;
    }
    return *this;
  }
  mint& operator*=(const mint& r) {
    if ((x *= r.x) > MOD) {
      x %= MOD;
    }
    return *this;
  }
  mint& operator++() {
    if ((++x) >= MOD) {
      x -= MOD;
    }
    return *this;
  }
  mint operator++(int) {
    mint ret = x;
    if ((++x) >= MOD) {
      x -= MOD;
    }
    return ret;
  }
  mint& operator--() {
    if ((--x) < 0) {
      x += MOD;
    }
    return *this;
  }
  mint operator--(int) {
    mint ret = x;
    if ((--x) < 0) {
      x += MOD;
    }
    return ret;
  }
  mint operator+(const mint& r) {
    mint ret;
    return ret = x + r.x;
  }
  mint operator-(const mint& r) {
    mint ret;
    return ret = x - r.x;
  }
  mint operator*(const mint& r) {
    mint ret;
    return ret = x * r.x;
  }
  mint operator-() {
    return mint() - *this;
  }
  bool operator<(const mint& a) {
    return x < a.x;
  }
  bool operator>(const mint& a) {
    return x > a.x;
  }
  bool operator<=(const mint& a) {
    return x <= a.x;
  }
  bool operator>=(const mint& a) {
    return x >= a.x;
  }
  bool operator==(const mint& a) {
    return x == a.x;
  }
  bool operator!=(const mint& a) {
    return x != a.x;
  }
};
ostream& operator<<(ostream& os, const mint& r) {
  os << r.x;
  return os;
}
ostream& operator>>(ostream& os, const mint& r) {
  os >> r.x;
  return os;
}

const double PI=3.14159265358979323846;

void solve(istream& cin, ostream& cout) {
  int r;
  cin >> r;
  double ans = r * 2 * PI;
  cout << ans << endl;
}

#ifndef TEST
int main() {
  OPTIMIZE_STDIO;
  solve(cin, cout);
  return 0;
}
#endif


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;
  double ans=2.0*3.14159265*r;
  cout<<fixed<<setprecision(2)<<ans;
}

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<algorithm>
#include<string>
#include<set>
#include<map>
#include<queue>
#include<cmath>
#define REP(i,a) for (int i = 0;i < (a);++i)
#define FOR(i,a,b) for (int i = (a);i < (b); ++i)
#define FORR(i,a,b) for (int i = (a);i >= (b); --i)
#define ALL(obj) (obj).begin(),(obj).end()
#define SORT(list) sort(ALL((list)));
#define MOD 1000000007
using namespace std;
using ll = long long;
int main(){
    int r;
    cin >> r;
    printf("%.5f\n",(double) r * 2 * M_PI);
    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 fast ios::sync_with_stdio(false), cin.tie(0);
#define ll long long
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define endl '\n'

using namespace std;

main()
{
    fast;
    double r;
    cin>>r;
    cout<<2*M_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>
using namespace std;
 
int main() {
	int r;
	cin>>r;
	double pi=3.1415926535;
	double c=2*pi*r;
	cout<<c<<endl;
	return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:10:18: error: expected '}' at end of input
   10 |         return 0;
      |                  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C

#include <iostream> // cout, endl, cin
#include <string> // string, to_string, stoi
#include <vector> // vector
#include <algorithm> // min, max, swap, sort, reverse, lower_bound, upper_bound
#include <utility> // pair, make_pair
#include <tuple> // tuple, make_tuple
#include <cstdint> // long long64_t, long long*_t
#include <cstdio> // prlong longf
#include <map> // map
#include <queue> // queue, priority_queue
#include <set> // set
#include <stack> // stack 
#include <deque> // deque
#include <unordered_map> // unordered_map
#include <unordered_set> // unordered_set
#include <bitset> // bitset
#include <cctype> // isupper, islower, isdigit, toupper, tolower
#include <math.h>
#include <iomanip> //setprecision
#include <limits>
#include <list>
using namespace std;
int main(){
  double r;
  cin >> r;
  cout << r*2*3.1415926535 << endl;
}


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

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

int main(){
  int r; cin>>r;
  cout<<3.14159265358979*2*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>
#define endl '\n'
#define pb push_back
#define fr first
#define sc second
#define ll long long int
#define bit(idx) idx&(-idx)
#define bin(x, a) bitset<a>(x)
#define all(A) A.begin(), A.end()
#define debug(x) cout << #x << " = " << x << endl;
using namespace std;

const long double PI = 3.14159;

int main(){
	ios_base::sync_with_stdio(NULL); cin.tie(); cout.tie();
	long double r; cin >> r;
	cout << (long double) 2* r * 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;
typedef long long ll;


using Graph = vector<vector<int>>;//グラフ型
void dfs(const Graph& G, int v/*根*/, vector<bool>& seen) {
	seen[v] = true;  //vを訪問済にする
	for (auto next_v : G[v]) { //訪問済にしたvとつながっている場所を順番に探す
		if (seen[next_v]) continue; //もし探索済みならスルー
		dfs(G, next_v, seen); //再帰的に探索
	}
}

void bfs(const Graph& G, queue<int>& que/*発見したが訪問はしていない*/, vector<int>& dist/*開始地点からの距離*/) {

	while (!que.empty()) {
		int v = que.front();//queのうち先頭のものからスタート
		que.pop();//先頭を削除

		for (int nv : G[v]) {//vとつながっている点を列挙
			if (dist[nv] != -1) continue;//発見済(=距離が格納されている)であればスルー
			dist[nv] = dist[v] + 1;//vとつながっている点に距離の情報を追加
			que.push(nv);//vとつながっている点を発見済にする
		}
	}
}

template<typename T>
T gcd(T a, T b) {
	if (a % b == 0) {
		return(b);
	}
	else {
		return(gcd(b, a % b));
	}
}

template<typename T>
T lcm(T a, T b) {
	return a * b / gcd(a, b);
}


template<typename T>
bool same(T x_b, T x_e, T y_b, T y_e) {
	for (auto i = x_b, j = y_b; i != x_e && j != y_e; ++i, ++j) {
		if (*i != *j) {
			return false;
		}
	}
	return true;
}


int main(void) {
	double n;
	cout<<2*n*acos(-1)
}

/*
9   3**2 1
27  3**3 2
81  3**4 3

11121213131415161516
3234566667

	
	*/


Compiler output:
a.cc: In function 'int main()':
a.cc:58:27: error: expected ';' before '}' token
   58 |         cout<<2*n*acos(-1)
      |                           ^
      |                           ;
   59 | }
      | ~
Language: C

 #include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
#define fr(i,n) for(i=0;i<n;i++)
#define F first
#define S second
#define fast std::ios_base::sync_with_stdio(false)
#define mod 1000000007
#define pi 3.14159265
int main() {
	fast;
	lli r;
	cin>>r;
	cout<<fixed<<setprecision(6)<<2*pi*r;
	
	return 0;
}

Compiler output:
main.c:1:11: fatal error: bits/stdc++.h: No such file or directory
    1 |  #include <bits/stdc++.h>
      |           ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
#define ll  long long
#define ff first
#define ss second
#define pb push_back
#define pp pair<ll,ll>
#define maxn 1000005
#define db double
#define mod 1000000007
using namespace std;
void solve(ll ind)
{
	ll x;
	cin >> x;
	db ans = (db)22/(db)7;
	ans = ans*2*(db)x;
	cout << ans;
}
int main()
{
	ll t=1,i=1;
	ios_base::sync_with_stdio(false);
    cin.tie(NULL);	
    std::cout.precision(6);
    std::cout.setf( std::ios::fixed, std:: ios::floatfield ); 
	//cin >> t;
	//cin >> n;
	while(i<=t)
	{
		solve(i);
		i++;
	}
	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;
using ll = long long; // ll は long long　と同じとする。(int64_t)
int main(){
    int R;
    cin >> R;
    cout << fixed << setprecision(20) << R * 2 * 3.14159265358979323846 << 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 namesapce std;

int main(void) {

  float r;
  cin >> r;
  cout << 2*r*3.141 << endl;
  return 0;
}


Compiler output:
a.cc:3:7: error: expected nested-name-specifier before 'namesapce'
    3 | using namesapce std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |   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:9:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |   cout << 2*r*3.141 << 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:9:24: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    9 |   cout << 2*r*3.141 << 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

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

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

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>
#define ll signed long long int
#define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define MAXX 1000005
using namespace std;

ll a[MAXX], b[MAXX], c[MAXX], k = 0;

signed main()
{
	FAST;
	ll n, m, f = 0, pi = 3.14;
	cin >> n;
	cout << 2 * pi * n;
	
}

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.*;
import java.util.ArrayList;
import java.util.Collections;

class Main{
    public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);

        int R = sc.nextInt();
        System.out.println(2 * R * 3.14);
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.*;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.*;
      |            ^
main.c:2:1: error: unknown type name 'import'
    2 | import java.util.ArrayList;
      | ^~~~~~
main.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | import java.util.ArrayList;
      |            ^
main.c:3:1: error: unknown type name 'import'
    3 | import java.util.Collections;
      | ^~~~~~
main.c:3:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    3 | import java.util.Collections;
      |            ^
main.c:5:1: error: unknown type name 'class'
    5 | class Main{
      | ^~~~~
main.c:5:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    5 | class Main{
      |           ^
Language: C

#include <iostream>
#include <iomanip>
#include <random>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <cmath>
#include <numeric>
#include <cstdlib>
#include <cstring>
#include <deque>
#include <sstream>
#include <bitset>
#include <cassert>
#include <fstream>
#include <queue>

#define len(X) ((int)(X).size())

#ifdef __LOCAL
	#define DEBUG_OUTPUT_ENABLED 1
	#define DBG(X) dout << #X << "=" << (X) << '\n';
	#define SAY(X) dout << (X) << '\n';
#else
	#define DEBUG_OUTPUT_ENABLED 0
	#define DBG(X) 42;
	#define SAY(X) 42;
#endif

#define dout   ___debug::instance

using namespace std;
using ll = long long int;
using ull = unsigned long long int;
using ld  = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template<typename T, typename S> inline ostream& operator<<(ostream& os, const pair<T, S> p) { cout << "[" << p.first << ";" << p.second << "]"; return os; }
template<typename T> inline ostream& operator<<(ostream& os, const vector<T>& v) { for(auto el: v) cout << el << " "; return os; }
template<typename T> inline ostream& operator<<(ostream& os, const set<T>& v) { for(auto el: v) cout << el << " "; return os; }
template<typename T, typename S> inline ostream& operator<<(ostream& os, const map<T, S>& v) { for(auto el: v) cout << el << " "; return os; }
template<typename T> inline ostream& operator<<(ostream& os, const multiset<T>& v) { for(auto el: v) cout << el << " "; return os; }
namespace ___debug {
	struct DebugStream {
		private:
			bool is_first;
		public:
			DebugStream(bool _is_first): is_first(_is_first) {}
			template<typename T> DebugStream operator<<(const T& value) const {
				assert(DEBUG_OUTPUT_ENABLED);
				if(is_first) cout << "[DBG] ";
				cout << value;
				return DebugStream(false);
			};

			template<typename T> DebugStream printArray(T* l, T* r) {
				assert(DEBUG_OUTPUT_ENABLED);
				if(is_first) cout << "[DBG] ";
				while(l != r) {
					cout << (*l);
					++l;
					if(l == r) {
						cout << '\n';
					} else {
						cout << ' ';
					}
				}
				return DebugStream(false);
			}
	};
	DebugStream instance(true);
};

const int INT_INF = (int)(2e9);
const ll  LL_INF  = (ll)(2e18);

const int NIL = -1;
static mt19937 _g(time(nullptr));

inline ll randint(ll a, ll b) { ll w = (_g() << 31LL) ^ _g(); return a + w % (b - a + 1); }
inline void fast_io() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); };
template<typename T> inline T sign(T x) { return T(x > 0) - T(x < 0); }
template<typename T> inline T fetch() { T ret; cin >> ret; return ret; }
template<typename T> inline vector<T> fetch_vec(int sz) { vector<T> ret(sz); for(auto& elem: ret) cin >> elem; return ret; }

void solve() {
	ld v = fetch<ld>();
	cout << fixed << setprecision(12) << (v * 6.28318530717958623200) << '\n';
}

int main() {
	fast_io();
	solve();

	return 0;
}


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

//
// Created by 加藤英祐 on 2020/04/14.
//
#include <bits/stdc++.h>
using namespace std;
int main(){
    int R;
    cin >> R;
    cout << 2 * R * 3.141592;

    return 0;
}

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

#pragma region
#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <vector>
#include <map>
#include <queue>
#include <stack>
#include <set>
#include <list>
#include <iomanip>
#include <cstdint>
#include <cstdlib>

using namespace std;
typedef long long ll;
//#define rep(i, s, e) for (int(i) = (s); (i) < (e); ++(i))
#define rep(i, e) for (int(i) = 0; (i) < (e); ++(i))
#define rrep(i, s) for (int(i) = (s) - 1; (i) >= 0; --(i))
#define all(x) x.begin(),x.end()
#pragma endregion


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

Compiler output:
main.c:3:10: fatal error: iostream: No such file or directory
    3 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

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

// in-short-use macros

#define all(c) (c).begin(),(c).end()
#define ll long long int
#define ld long double
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define mod 1000000007
#define PI 3.14159265
#define sizes 1000010

# define M_PI           3.14159265358979323846

//main function here

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    
    ld n;
    cin>>n;
    cout<<2*n*M_PI<<"\n";
    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 all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define intll int long long
const int INF = 1e9;
const int MOD = 1e9 + 7;

int main() {
  double x ;
  cin >> x ;
  x *=2;
  
  cout << x * 3.141592 ;
  


}


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 ll = long long;
#define FOR(i, k, n) for(ll i = (k); i < (n); i++)
#define FORe(i, k, n) for(ll i = (k); i <= (n); i++)
#define FORr(i, k, n) for(ll i = (k)-1; i > (n); i--)
#define FORre(i, k, n) for(ll i = (k)-1; i >= (n); i--)
#define REP(i, n) FOR(i, 0, n)
#define REPr(i, n) FORre(i, n, 0)
#define ALL(x) (x).begin(), (x).end()
#define ALLr(x) (x).rbegin(), (x).rend()
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
using namespace std;

const int INF = 1001001001;

int main(void){
  int r;
  cin >> r;
  double ans = acos(-1)*r*2;
  printf("%.10f\n", ans);
  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 <cstdio>
#include <cmath>
using namespace std;
const double Pi = acos(-1);
double r;
int main() {
	cin >> r;
	printf("%.20lf", 2 * Pi * 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>
#define rep(i,n) for (int i=0; i<(n); i++)
using namespace std;
using ll = long long;

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

    cout << setprecision(20) << 2.0 * R * M_PI << 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 <algorithm>
#include <cmath>
#include <iostream>
#include <map>
#include <string>
using namespace std;
const double PI = 3.1415926535897932;
int main() {
  int r = 0;
  cin >> r;
  int res = PI * 2 * r;
  cout << res << endl;
  return 0;
}

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

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <string>
#include <iomanip>
#include <algorithm>
#include <vector>
#include<bits/stdc++.h>
using namespace std;

int N, M;
string S;
long double R;

int main(){

    cin >> R;

    cout << 2.0*acos(-1)*R;


}


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;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
typedef long long ll;
const int INF (1<<30);

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

  double pi = 3.14159265;

  printf("%.10f\n", 2.0*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>
#include <vector>
#include <math.h>
#define PI 3.141592653589
using namespace std;

int main(){
    int n = 0;
    cin >> n;
    cout << 2 * n * 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 <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
using namespace std;

typedef long long ll;

const int INF = 1e9;

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

    cout << fixed << setprecision(6) << 2.0*R*M_PI << "\n";
}

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

# -*- coding: utf-8 -*-

import math

r=int(input())

print(r*2*math.pi)


Compiler output:
main.c:1:3: error: invalid preprocessing directive #-
    1 | # -*- coding: utf-8 -*-
      |   ^
main.c:3:1: error: unknown type name 'import'
    3 | import math
      | ^~~~~~
main.c:5:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'r'
    5 | r=int(input())
      | ^
Language: C

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

// M A F I A - M A F I A - M A F I A - M A F I A - M A F I A - M A F I A //

#define int                                       long long
#define lop(i,s,e)                                for(int i=s;i<(int)e;i++)
#define rlop(i,e,s)                               for(int i=e;i>=s;i--)
#define prvec(v)                                  lop(R15,0,v.size())cout << v[R15] <<" "; cout << endl;
#define prarr(arr,s1,e1)                          lop(R15,s1,e1)cout << arr[R15] << " "; cout << endl;

#define endl                                      '\n'
#define ff                                        first
#define ss                                        second
#define pii                                       pair<int,int>

#define pb                                        push_back
#define all(v)                                    v.begin(),v.end()

// M A F I A - M A F I A - M A F I A - M A F I A - M A F I A - M A F I A //

const int N = 3e6 + 7, M = 1000000007, inf = INT_MAX;
const long long INF = LLONG_MAX;

int n, Q;
int arr[N + 2];
long double pi = 3.14159265;

void solve()
{
	double n;
	cin >> n;
	cout << fixed << setprecision(12) << 2 * pi*n << endl;

}

int32_t main()
{
	ios_base::sync_with_stdio(0);   cin.tie(0);   cout.tie(0);


	cout << setprecision(9) << fixed;
	clock_t z = clock();

	// cerr << "Run Time : " << ((double)(clock() - z) / CLOCKS_PER_SEC);
	int test = 1;
	// cin >> test;
	while (test--)solve();


}





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;
template <class A, class B> inline bool chmax(A &a, const B &b) { return b > a && (a = b, true); }
template <class A, class B> inline bool chmin(A &a, const B &b) { return b < a && (a = b, true); }
typedef long long ll;
typedef vector<int> vint;
typedef pair<int, int> pint;
typedef vector<long long> vlong;
typedef vector<string> vstring;
#define _GLIBCXX_DEBUG
#define vpush(a,x) a.push_back(x);
#define rep(i, n) REP(i, 0, n)
#define all(v) v.begin(), v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)
const int INF = 1 << 30;
const int dx[] = {1,0,-1,0,1,1,-1,-1};
const int dy[] = {0,-1,0,1,1,-1,-1,1};
#define stp(x)  setprecision(x)
int main(){
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  double r;
  cin>>r;
  cout<<(r+r)*3.141592<<'\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

def Int():
    return int(input())
def Ints():
    return map(int,input().split())
def IntList():
    return list(Ints())
def IntMat(N):
    return [IntList() for i in range(N)]

r = Int()
import math
print(2*r*math.pi)

Compiler output:
main.c:1:1: error: unknown type name 'def'
    1 | def Int():
      | ^~~
main.c: In function 'Int':
main.c:1:10: error: expected declaration specifiers before ':' token
    1 | def Int():
      |          ^
Language: C

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

int main() {
  double A,B;
  cin >> A  ;

  
cout <<(double) 2*3.141592*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: C

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

int main() {
  int R;
  cin >> R;
  double A = R * 6.2831853071795;
  
  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: C

import java.io.*;
import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)), false);
        
        double pi = 3.14159;
        int r = in.nextInt();
        out.println(pi*2*r);
        
        
        in.close();out.flush();out.close();
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.io.*;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.io.*;
      |            ^
main.c:2:1: error: unknown type name 'import'
    2 | import java.util.*;
      | ^~~~~~
main.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | import java.util.*;
      |            ^
main.c:3:1: error: unknown type name 'public'
    3 | public class Main {
      | ^~~~~~
main.c:3:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Main'
    3 | public class Main {
      |              ^~~~
Language: C

#include<bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < n; i++)
#define all(x)(x).begin(), (x).end() // 昇順ソート
#define rall(v)(v).rbegin(), (v).rend() // 降順ソート
#define INF 1LL << 60
typedef long long int LL;
typedef long long int ll;
#define pll pair < ll, ll >
#define F first
#define S second
const int MOD = 1000000007;
template < class T > bool chmax(T & a,const T & b) { if (a < b) { a = b; return true; } return false; }
template < class T > bool chmin(T & a,const T & b) { if (a > b) { a = b; return true; } return false; }
// 任意のlogは　対数の底の変換を使う    log(N) / log(任意の底)

int main() {
    double R;cin >> R;
    double ans = 2*R*M_PI;
    cout << std::fixed << std::setprecision(15) << ans << 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
const int MAX = 510000;
const int MOD =  1000000007;

     signed main(){
        int r;
        cin>>r;
        cout<<r*2*M_PI<<endl;



      }

        


Compiler output:
main.c:1:18: fatal error: bits/stdc++.h: No such file or directory
    1 |         #include <bits/stdc++.h>
      |                  ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define pll pair < ll , ll >
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define ld long double
#define endl "\n"
using namespace std;
using namespace __gnu_pbds;
ll M = 1e9 + 7;

typedef tree<
int,
null_type,
less<int>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;

int main()
{

    ios_base :: sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int p;
    cin >> p;
    cout << fixed << setprecision(12) << p*3.141592653589793238462*2;
}


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 <vector>
using namespace std;
using ll = long long;

int main()
{
	int r;
	cin >> r;
	printf("%.9lf\n", 2 * 3.1415926535897932384 * r);
	return 0;
}

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

//  Copyright © 2020 Diego Garcia Rodriguez del Campo. All rights reserved.
#include<bits/stdc++.h>
#define MAX 200005
#define optimiza_io cin.tie(0); ios_base::sync_with_stdio(0);
#define forn(i,a,b) for (int i = a; i <= b; i ++ )
#define mod(n,k) (((n%k)+k)%k)
using namespace std;
typedef long long ll;

int main()
{
    optimiza_io
    long double R;
    cin >> R;
    cout << fixed << setprecision( 10 ) << R * 2 * 3.1415926535897932 << "\n";
    return 0;
}

// CHECAR LIMITES 

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<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
#include<cstdio>
#include<cstdlib>
#include<unordered_map>
#include<unordered_set>
using namespace std;

#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592
#define PI acos(-1.0);

const double EPS = 1e-10;

using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;


int main(){
    cout << fixed << setprecision(5);
    int r; cin >> r;
    double ans = 2*r*PI;
    cout << ans <<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>
#define maxn 200001
#define maxa 2000005
#define MOD  998244353 //1000000007
#define INF 1000000000000000000

using namespace std;

#define int int64_t
#define ll long long
#define pii pair<ll, ll>
#define piii pair<pii, ll>
#define ft first
#define sd second
#define pb push_back
#define rep(i, n) for(ll i = 0; i < n; i++)
#define repr(i, n) for(ll i = n-1; i >= 0; i--)
#define mem(a, b) memset(a, b, sizeof(a))
#define all(v) v.begin(), v.end()
#define edge(v, x, y) v[x].pb(y); v[y].pb(x);
#define popcount __builtin_popcount

void fast(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout << setprecision(10) << fixed;
}
ll ceil(ll a, ll b){ return (a+ b-1)/b; }
void flaged(bool flag){
    if(flag) cout << "Yes\n";
    else cout << "No\n";
}
// power and modulo inverse
ll power(ll a, ll b = MOD-2){
    if(b == 0) return 1;
    ll r = power(a, b/2);
    r = (r*r)%MOD;
    if(b%2 == 1) r = (r*a)%MOD;
    return r;
}
// factorial
ll fact[maxa], finv[maxa];
void calf(){
    fact[0] = finv[0] = 1;
    for(ll i = 1; i < maxa; i++){fact[i] = (fact[i-1]*i) %MOD;finv[i] = (finv[i-1]*power(i))%MOD;}
}
// nCr
ll ncr(ll N, ll R){ if(R > N) return 0; return (fact[N]*((finv[R]*finv[N-R])%MOD))%MOD;}



void solve(){
    double n;cin >> n; cout << 2*3.14*n;
}

main(){
    ll t = 1; //cin >> t;
    while(t--){
        solve();
    }
}


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<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
const double pai=3.14159265358979323846;
int main() {
	double r;
	scanf("%lf",&r);
	printf("%lf\n",2*pai*r);
}

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

//“ In order to be irreplaceable, one must always be different”
#include <bits/stdc++.h>
using namespace std;
# define ll long long
#define endl "\n"
# define pi 3.14159265359
# define str string
# define vll vector<ll>
# define vstr vector<str>
# define vchar vector<char>
# define pb push_back
# define popb pop_back
# define pf push_front
# define popf pop_front
# define sll set<ll>
# define schar set<char>
//find()
//erase(x) removes element x
//erase(position,position)
# define qll queue<ll>
# define qstr queue<str>
//front(),back()
# define stll stack<ll>
# define ststr stack<str>
//top()
# define dll deque<ll>
//at()
# define mll map<ll,ll>
#define mchar map<char, ll>
# define mstr map<str,ll>
# define mss map<str,str>
# define mci map<char,ll>
# define vp vector< pair<ll,ll> >
#define mp make_pair
#define ff first
#define ss second
#define pll pair<ll,ll>
# define f(x,y) for(int x=0;x<y;x++)
# define r(x,y) for(int x=y;x>=0;x--)
# define fr(x,y,z) for(int x=y;x<z;x++)
# define rr(x,y,z) for(int x=y;x>z;x--)
ll power(ll a , ll b){ll res=1;for(ll i=0; i<b; ++i){res*=a;}return res;}
ll logx(ll base, ll num){int cnt=0;while(num!=1){num/=base; ++cnt;}return cnt;}
ll gcd(ll a, ll b){
    if(b == 0)
        return a;
    return gcd(b, a % b);
}
ll lcm(ll a, ll b){
    return (a*b)/gcd(a, b);
}
void print(vll a){
    for(int i=0;i<a.size();i++){
        cout<<a[i]<<' ';
    }
    cout<<endl;
}
vll inp(int n){
    vll a;
    ll x;
    f(i,n){
        cin>>x;
        a.pb(x);
    }
    return a;
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
   long double x;
    cin>>x;
    cout<<2*pi*x;
}

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>
 size_t strlen(const char *s);
#define rep(i,n) for(long long int i=0;i<n;i++)
#define sz(x) ((int)(x).size())

using namespace std;
std::vector<int> graph[10050];//graph頂点数のsize
const int N=200010;
const int P=1000000007;
using ll = long long;
vector<ll> prime;

//絶対値
int ze(int a, int b){
	if(a>b){
		return a-b;
	}else{
		return b-a;
	}
}
//小さい方
long long int min(long long int a,long long int b){
	if(a>b){
		return b;
	}else{
		return a;
	}
}
//大きい方
long long int max(long long int a,long long int b){
	if(a>b){
		return a;
	}else{
		return b;
	}
}
// a^n mod 
long long modpow(long long a, long long n, long long mod) {
    long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % mod;
        a = a * a % mod;
        n >>= 1;
    }
    return res;
}

// a^{-1} mod 
long long modinv(long long a, long long mod) {
    return modpow(a, mod - 2, mod);
}

//mod掛け算
long long mt(long long a, long long b, long long mod){
	return (a*b)%mod;
}

//メモ

/*
	memset(b, '\0', sizeof(b));
初期化*/


/*
	string s;
	s.size()
*/

/*
	char s[N];
	strlen(s)
*/
/*
	if(  <  )puts("Yes");
	else puts("No");
*/

/*文字列比較
if(strcmp(name[i],s)==0)
*/

/*
	graph[a].push_back(b);//graph[a][i番目に入れた]==b
	graph[j].size()	//forで回すときとか

*/


int main(){
	long double n;
	cin>>n;



printf("%llf\n",n*3.14159265358979);

}


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 <vector>
#include <string>
#include <math.h>
#include <algorithm>
#include <set>
#include <iomanip>
#include <stdio.h>
#include <sstream>
#include <bits/stdc++.h>
using namespace std;
long double pi=3.1415926535897932384626433832795028;
int main(void){
  long double r;
  cin>>r;
  double ans=2*r*pi;
  cout<<fixed<<setprecision(10)<<ans<<endl;
}

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>
#include <string>
#include <iostream>
#include <iomanip>
#include <cstdlib> //絶対値整数abs
#include <cmath>   //絶対値少数fbs
#include <math.h>
using namespace std;
#define rep(i, N) for (ll i = 0; i < (N); i++)
typedef long long ll;

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll R;
    cin >> R;
    cout << R * 3.1415 * 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>
using namespace std;
#define rep(i,n) for(int i = 0; i < n; i++)
#define print(n) cout << n << endl
#define YN(c) (c)?(print("YES")):(print("NO"))
#define Yn(c) (c)?(print("Yes")):(print("No"))
#define yn(c) (c)?(print("yes")):(print("no"))
#define in(v) int v; cin >> v
#define vint vector<int>
#define pb push_back
typedef long long int ll;
#define swap(a,b) do{a=a^b;b=a^b;a=a^b;}while(0)
ll gcd(ll a, ll b){
  if(a<b) return gcd(b,a);
  ll r;
  while(r=a%b){
  	a=b;
  	b=r;
  }
  return b;
}

int main(){
  double r;
  print(2*3.1415*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; 
typedef long long ll; 
int main() 
{ 
		ios::sync_with_stdio(false); 
		cin.tie(NULL); 
		int r;
		cin>>r; 
		const int pi=3.1415; 
		cout<<(2*pi*r); 
		return 0; 
}


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