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

///////////////////////////////////////////
// product.cpp created 2018-12-22
// Kamil Tokarski

/*       biblioteczka       */
#include <set>
#include <map>
#include <queue>
#include <vector>
#include <string>
#include <iomanip>
#include <fstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>
using namespace std;

// types
typedef long long ll;
typedef long double ld;

#define PR  pair
#define PII pair<ll, ll>
#define PLL pair<ll, ll>

#define VEC vector
#define VL VEC<ll>
#define VI VEC<ll>
#define VPI VEC<PII>
#define VPL VEC<PLL>

// IO
#define fastio ios_base::sync_with_stdio(NULL);cout.tie(NULL);cin.tie(NULL)
#define precise(x) cout << fixed << setprecision(x)

#define read_file(var, file) ifstream var(file)
#define write_file(var, file) ofstream var(file)
#define close_file(var) var.close()

// containers
#define sz(x) (ll)(x.size())
#define all(x) x.begin(), x.end()
/*          koniec          */
const ll MAXN = 1e6 + 1;

struct Div {
  ll value;
  ll alpha;

  bool operator<(const Div &d) const {
    return alpha < d.alpha; 
  }
};
vector<Div> divs;

ll N, P;
ll sito[MAXN];

ll main(ll argc, char **argv) {
  fastio;

  for(ll i = 2; i < MAXN; ++i) {
    if(sito[i])
      continue;
    sito[i] = i;
    for(ll j = 2 * i; j < MAXN; j += 1)
      sito[j] = i;
  }

  cin >> N >> P; 
  if(N == 1) {
    cout << P << endl;
    return 0;
  }

  for(ll i = 2; i < MAXN; ++i) {
    if(P % i)
      continue;
    ll alpha = 0;
    while(P > 1 && (P % i) == 0)
      ++alpha,
        P /= i;
    divs.push_back({i, alpha});
  }

  if(P > 1) {
    divs.push_back({P, 1});
    cout << 1 << endl;
    return 0;
  }

  ll alpha_sum = 0;
  for(auto d : divs)
    alpha_sum += d.alpha;
  if(alpha_sum < N) {
    cout << 1 << endl; 
    return 0;
  }

  sort(all(divs));
  ll gcd = 1;
  for(auto &d : divs) {
    ll reflow = (d.alpha) / sz(divs);
    if(reflow == 0)
      continue;

    gcd *= (d.value * reflow);
  }

  cout << gcd << endl;
  return 0;
}



Compiler output:
a.cc:59:1: error: '::main' must return 'int'
   59 | ll main(ll argc, char **argv) {
      | ^~
a.cc:59:4: warning: first argument of 'int main(ll, char**)' should be 'int' [-Wmain]
   59 | ll main(ll argc, char **argv) {
      |    ^~~~
Language: C++

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

int main(){
	int n,p,ans=1;
	cin >> n >> p;
	for(int i=2;;i++){
		if(p<pow(i,n)) break;
		if(p%pow(i,n)==0){
			ans*=i;
			p=p/pow(i,n);
			i--;
		}
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: invalid operands of types 'int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
    9 |                 if(p%pow(i,n)==0){
      |                    ~^~~~~~~~~
      |                    |    |
      |                    int  __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<bits/stdc++.h>
using namespace std;
int GCD(int a,int b)
{
	if(a%b==0)
		return b;
	return GCD(b,a%b)
}
int main()
{
	int a,b;
	scanf("%d %d",&a,&b);
	printf("%d",GCD(a,b));
	return 0;
}

Compiler output:
a.cc: In function 'int GCD(int, int)':
a.cc:7:26: error: expected ';' before '}' token
    7 |         return GCD(b,a%b)
      |                          ^
      |                          ;
    8 | }
      | ~
Language: C++

N, P=map(int, input().split())

s=0
R=int(P)
ls=[]
if R==1:
    ls=[1]
else:
    while s==0:
        for i in range(2,R+1):
            if P%i==0:
                P=P/i
                if P==1:
                    s=1
                ls.append(i)
                break
# print(ls)

dic={}
for a in ls:
    dic[a]=dic.get(a,0)+1
ls_dic=list(dic.items())

ans=1
for i in range(len(dic)):
    if ls_dic[i][1]>=N:
        ans*=ls_dic[i][0]
print(ans)


Compiler output:
a.cc:17:3: error: invalid preprocessing directive #print
   17 | # print(ls)
      |   ^~~~~
a.cc:1:1: error: 'N' does not name a type
    1 | N, P=map(int, input().split())
      | ^
a.cc:20:1: error: expected unqualified-id before 'for'
   20 | for a in ls:
      | ^~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define inf 1<<30
#define pqueue priority_queue
#define mp make_pair
#define pb push_back
#define fn fill_n
typedef long long llong;
typedef unsigned long long ullong;
typedef pair<int, int> P;

map<llong, int> soinsuBunkai(llong n){
	map<llong, int> ret;
	ret[1] = 1;
	while(n % 2 == 0){
		ret[2]++;
		n /= 2;
	}
	while(n > 1){
		llong now = n;
		for(llong i = 3; i*i <= n; i += 2){
			while(n%i == 0){
				ret[i]++;
				n /= i;
			}
		}
		if(now != n) continue;
		ret[n]++;
		n = 1;
	}

	return ret;
}


llong N, p;
int main(){
	cin >> N >> p;
	auto soinsu = soinsuBunkai(p);
	llong ans = 1;
	for(auto it = soinsu.begin(); it != soinsu.end(); it++){
		ans *= max(1,it->first*(it->second/N));
	}

	cout << ans << endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:27: error: no matching function for call to 'max(int, long long int)'
   44 |                 ans *= max(1,it->first*(it->second/N));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:44:27: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   44 |                 ans *= max(1,it->first*(it->second/N));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:44:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   44 |                 ans *= max(1,it->first*(it->second/N));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
  ll n;
  cin >> n;
  vector<ll> a(n);
  bool odd=false;
  for(int i=0;i<n;i++){
    cin >> a[i];
    if(a[i]%2==1){
      odd=true;
    }
  }
  if(odd){
    cout << first << endl;
  }
  else{
    cout << second << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:13: error: 'first' was not declared in this scope
   16 |     cout << first << endl;
      |             ^~~~~
a.cc:19:13: error: 'second' was not declared in this scope
   19 |     cout << second << endl;
      |             ^~~~~~
Language: C++

#include <iostream>
#include <vector>
#include <cassert>
#include <algorithm>
#include <functional>
#include <iomanip>
int MOD=1e9+7;
using namespace std;
int main(){
    int n;
    cin >> n;
    bool h=true;
    for(int i=0<n;i++){
        int x;
        cin>> x;
        if(x%2==1){
            h=false;
            break;
        }
    }
    if(h){
        cout<<"second"<<endl;
    }else{
        cout<<"first"<<endl;
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:22: error: expected ';' before ')' token
   13 |     for(int i=0<n;i++){
      |                      ^
      |                      ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int a[100001]
int main()
{
 	int n;
 	cin>>n;
 	for(int i=1;i<=n;i++) cin>>a[i];
 	ull sum=0;
 	for(int i=1;i<=n;i++) sum+=a[i];
 	if(sum%n==0) cout<<"second";
 	else cout<<"first";
	return 0;
}


Compiler output:
a.cc:6:1: error: expected initializer before 'int'
    6 | int main()
      | ^~~
Language: C++

// Harlequin.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
using namespace std;

int n, x;
int c;

int main()
{
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> x;
		c += x;

	if (c % 2 == 1) {
		cout << "first" << endl;
	}

	else {
		cout << "second" << endl;
	}

	return 0;
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file


Compiler output:
a.cc: In function 'int main()':
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:11:1: note: to match this '{'
   11 | {
      | ^
Language: C++

#include <iostream>
int main(){
  bool a=false;
  int n;
 cin>> n;
  for(int i =0;i<n;i++){
    int b;
    cin>>b;
    if(a%2==1){
      a=true;
      break;
    }
  }
  if(a)cout<<"first";
  else cout<<"second";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:2: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |  cin>> n;
      |  ^~~
      |  std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:14:8: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 |   if(a)cout<<"first";
      |        ^~~~
      |        std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:15:8: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   15 |   else cout<<"second";
      |        ^~~~
      |        std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

void main(){
  bool a=false;
  int n;
 cin>> n;
  for(int i =0;i<n;i++){
    int b;
    cin>>b;
    if(a%2==1){
      a=true;
      break;
    }
  }
  if(a)cout<<"first";
  else cout<<"second";
}

Compiler output:
a.cc:1:1: error: '::main' must return 'int'
    1 | void main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:4:2: error: 'cin' was not declared in this scope
    4 |  cin>> n;
      |  ^~~
a.cc:13:8: error: 'cout' was not declared in this scope
   13 |   if(a)cout<<"first";
      |        ^~~~
a.cc:14:8: error: 'cout' was not declared in this scope
   14 |   else cout<<"second";
      |        ^~~~
Language: C++

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

#define start_routine() int begtime = clock();
#define end_routine() int endtime = clock(); cerr << endl << "Time elapsed: " << (endtime - begtime)*1000/CLOCKS_PER_SEC << " ms"; return 0
#define speed() cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(false)
#define exit(a, b) return cout << a, b;

#define PB push_back
#define MP make_pair

#define sd(n) scanf("%lld", &n)
#define pdn(n) printf("%lld\n", n);
#define pds(n) printf("%lld ", n);
#define endl '\n'

#define forn(a, b, i) for (int i = a; i < b; i += 1)
#define all(v) v.begin(), v.end() 

using vi = vector<int>;
using vb = vector<bool>;
using pii = pair<int, int>;
using mii = map<int, int>;

#define print(stuff) cout << stuff << endl
#define len(stuff) stuff.size()

#define int long long
#define float long double 

const int upper = 4e5 + 2;
const int M = (int) 1e9 + 7;
const int inf = (int) 1e17;
const double eps =  1e-8;

int powers2[upper];
int exp (int a, int b) {
	if (b == 0) return 1;
	int ans = exp(a, b/2);
	ans = (ans * ans) % M;

	if (b & 1) ans = (ans * a) % M;
	return ans;
}

ordered_set lola;
signed main () {
	start_routine();
	speed();
	#ifndef ONLINE_JUDGE
	// freopen("input.txt", "r", stdin);	
	// freopen("output.txt", "w", stdout);
	// freopen("errlog.txt", "w", stderr);
	#endif

	bool flag = false;
	int n; cin >> n;
	for (int i = 1; i <= n; i++) {
		int haha; cin >> haha;
		if (haha % 2) flag = true;
	}

	if (flag) cout << "first";
	else cout << "second";
	
 	end_routine();	
}

Compiler output:
a.cc:46:1: error: 'ordered_set' does not name a type
   46 | ordered_set lola;
      | ^~~~~~~~~~~
Language: C++

#include<iostream>
using namespace std;
 
int main(){
  std::ios::sync_with_stdio(false);
  int n, k, i;
  cin >> n;
  for(i = 0; i != n; ++i){// 対照実験
    cin >> k;
    if((k & 1)){
      puts("first");
      return 0;
    }
  }
  puts("second");
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:16:12: error: expected '}' at end of input
   16 |   return 0;
      |            ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(int argc, char const *argv[])
{
	int n, i;
	string ans = "second";
	long long a;
	for(i = 0; i < n; ++i) {

		cin >> a;
		if(a % 2 == 0){
			s = "first";

			break;
		}
	}
	cout << ans;
	return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:14:25: error: 's' was not declared in this scope
   14 |                         s = "first";
      |                         ^
Language: C++

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

int main()
{
  	if(n%2==0)cout<<"first";
   	else cout<<"second";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:12: error: 'n' was not declared in this scope; did you mean 'yn'?
    6 |         if(n%2==0)cout<<"first";
      |            ^
      |            yn
Language: C++

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

int main(){
  
print('second' if all(a[i] % 2 == 0 for i in range(N)) else 'first')
}

Compiler output:
a.cc:6:7: warning: multi-character literal with 6 characters exceeds 'int' size of 4 bytes
    6 | print('second' if all(a[i] % 2 == 0 for i in range(N)) else 'first')
      |       ^~~~~~~~
a.cc:6:61: warning: multi-character literal with 5 characters exceeds 'int' size of 4 bytes
    6 | print('second' if all(a[i] % 2 == 0 for i in range(N)) else 'first')
      |                                                             ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:15: error: expected ')' before 'if'
    6 | print('second' if all(a[i] % 2 == 0 for i in range(N)) else 'first')
      |      ~        ^~~
      |               )
a.cc:6:1: error: 'print' was not declared in this scope; did you mean 'rint'?
    6 | print('second' if all(a[i] % 2 == 0 for i in range(N)) else 'first')
      | ^~~~~
      | rint
Language: C++

#include <iostream>
#include <utility>
#include <map>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <array>
#include <math.h>
#include <numeric>
#include <sstream>
#include <queue>
const int INF = 1e9;
const int MOD = 1e9+7;
const long long LINF = 1e18;
#define dump(x)  cout << 'x' << ' = ' << (x) << ` `;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)
#define FOREACH(x,a) for(auto& (x) : (a) )
typedef long long ll;
using namespace std;
int main(int argc, char const *argv[]) {
    int n;
    cin >> n;
    vector<ll> a(n);
    REP(i,n) cin >> a[i];
    bool hoge = false;
    REP(i,n) if (a[i]%2 == 1) hoge = true;
    if(f) cout << "first" << std::endl;
    else cout << "second" << std::endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:30:8: error: 'f' was not declared in this scope
   30 |     if(f) cout << "first" << std::endl;
      |        ^
Language: C

#include <stdio.h>
int main(void){
  int n,a,i;
  scanf("%d",&n);
  for(i=1;i<=n,i++){
    scanf("%d",&a);
    if(a%2==1){
      printf("second");
      return 0;
    }
  }
  printf("first");
}

Compiler output:
main.c: In function 'main':
main.c:5:19: error: expected ';' before ')' token
    5 |   for(i=1;i<=n,i++){
      |                   ^
      |                   ;
Language: C++

#include<iostream>
using namespace std;

int main(){
  int n;cin>>n;
  bool flag=true;
  for(int i=0;i<n;i++){
    if(a[i]%2!=0)flag=false
  }
  cout<<(flag?"first":second)<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: 'a' was not declared in this scope
    8 |     if(a[i]%2!=0)flag=false
      |        ^
a.cc:8:28: error: expected ';' before '}' token
    8 |     if(a[i]%2!=0)flag=false
      |                            ^
      |                            ;
    9 |   }
      |   ~                         
a.cc:10:23: error: 'second' was not declared in this scope
   10 |   cout<<(flag?"first":second)<<endl;
      |                       ^~~~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
#define MAXSIZE 100001
#define MAXL 100
typedef long long int lli;

int main(){
    int n;
    cin >> n;
    int flag = 0;
    for(int i = 0; i < n; i++){
        cin >> a[i];
        if(flag == 0 && a[i] % 2 != 0){
            flag = 1;
        }
    }

    if(flag){
        cout << "first" << endl;
    }else{
        cout << "second" << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:16: error: 'a' was not declared in this scope
   14 |         cin >> a[i];
      |                ^
Language: C

#include<stdio.h>

int main(){
	int N,a;
	scanf("%d",&N);
	for(int i=0;i<N;i++){
		scanf("%d",&a);
		if(as%2==1){
			printf("first\n");
			return 0;
		}
	}
	printf("second\n");
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:20: error: 'as' undeclared (first use in this function); did you mean 'a'?
    8 |                 if(as%2==1){
      |                    ^~
      |                    a
main.c:8:20: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

/******************************************
* AUTHOR : Eaugene Thomas
******************************************/
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mod 1000000007
#define faster ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int main() {
faster;
int n=0;
cin>>n;
//lli a,b;
//cin>>a>>b;

lli x[n],y[n];

for(int i=0;i<n;i++)
{
	cin>>x[i];
}

int c=0;

for(int i=0;i<n;i++)
{
	c=c^x[i];
}
if(c%2==0)
{
	cout<<"second"<<"\n";
}
else
{
	cout<<"first"<<"\n";
}
return 0;
}
/******************************************
* AUTHOR : Eaugene Thomas
******************************************/
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mod 1000000007
#define faster ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int main() {
faster;
int n=0;
cin>>n;
//lli a,b;
//cin>>a>>b;

lli x[n],y[n];

for(int i=0;i<n;i++)
{
	cin>>x[i];
}
int c=0;

for(int i=0;i<n;i++)
{
	if(x[i]%2==0)
		c=0;
}
if(c==0)
{
	cout<<"second"<<"\n";
}
else
{
	cout<<"first"<<"\n";
}
return 0;
}


Compiler output:
a.cc:47:5: error: redefinition of 'int main()'
   47 | int main() {
      |     ^~~~
a.cc:9:5: note: 'int main()' previously defined here
    9 | int main() {
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VRSORT(v) sort(v.rbegin(), v.rend());//vectorの降順ソート
#define ll long long
#define pb(a) push_back(a)
#define INF 1000000000
#define OUT(x) cout << x << endl
using namespace std;
typedef pair<int, int> P;
typedef pair<ll, ll> LP;
typedef pair<int, P> PP;
typedef pair<ll, LP> LPP;

int dy[]={0, 0, 1, -1, 0};
int dx[]={1, -1, 0, 0, 0};

int main(){
  int n;
  cin >> n;
  bool add=false//奇数が含まれるかどうか
  REP(i,n){
    int a;cin>>a;
    if(a%2==1) add=true;
  }
  if(true) cout << "first" << endl;
  else cout << "second" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:19: error: expected ',' or ';' before 'for'
    2 | #define REP(i, n) for(int i = 0;i < n;i++)
      |                   ^~~
a.cc:26:3: note: in expansion of macro 'REP'
   26 |   REP(i,n){
      |   ^~~
a.cc:26:7: error: 'i' was not declared in this scope
   26 |   REP(i,n){
      |       ^
a.cc:2:33: note: in definition of macro 'REP'
    2 | #define REP(i, n) for(int i = 0;i < n;i++)
      |                                 ^
Language: C++

#include <iostream>
#include<vector>
#include<algorithm>
#include<random>
#include<string>
#include <stdio.h>
#include <time.h>
using namespace std;
#define REP(i,n) for(int i=0;i<n;i++)
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define INF 1000000000

int main()
{
    int N;
	cin>>N;
	vector<int>a(N);
	int f=0;
	REP(i,N){
		cin>>a[i]
		if(a[i]%2==1)f=1;
	}
	if(f==1)
	cout<<"first"<<endl;
	else
	cout<<"second"<<endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:26: error: expected ';' before 'if'
   20 |                 cin>>a[i]
      |                          ^
      |                          ;
   21 |                 if(a[i]%2==1)f=1;
      |                 ~~
Language: C++

#include<iostream>
#include <string>
#include<algorithm>
#include <set>
#include <cmath>
using namespace std;

int main(void){
	ios::sync_with_stdio(false);
	long N, i, j,k;
	cin >> N ;
	int a[N];
	k = 0;
	j = 0;
	for (i = 0; i < N; i++) {
		cin >> a[i];
	}
	sort(a, a + N, greater<int>());
	for (i = N-1; i >0; i--) {
		j += a[i] - a[i - 1];
		
	}
	if (j % 2 == 0) K = 1;
	if(k==0)	cout << "first";
	else cout << "second";
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:23:25: error: 'K' was not declared in this scope
   23 |         if (j % 2 == 0) K = 1;
      |                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#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++)


int main(){
  int n; cin >> n;
  int sum = 0;
  rep(i, n){
    int a; cin >> a;
    sum += a;
  }
  if((n % 2 == 0  && sum % n == 0) || (sum % 2 == 1 && n % 2 == 0) cout << "first" << endl;
  else cout << "second" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:67: error: expected ';' before 'cout'
   19 |   if((n % 2 == 0  && sum % n == 0) || (sum % 2 == 1 && n % 2 == 0) cout << "first" << endl;
      |                                                                   ^~~~~
      |                                                                   ;
a.cc:20:3: error: expected primary-expression before 'else'
   20 |   else cout << "second" << endl;
      |   ^~~~
a.cc:19:92: error: expected ')' before 'else'
   19 |   if((n % 2 == 0  && sum % n == 0) || (sum % 2 == 1 && n % 2 == 0) cout << "first" << endl;
      |     ~                                                                                      ^
      |                                                                                            )
   20 |   else cout << "second" << endl;
      |   ~~~~
Language: C++

#include<iostream>
#include <string>
#include<algorithm>
#include <set>
#include <cmath>
using namespace std;

int main(void){
	ios::sync_with_stdio(false);
	long N, i, j,k;
	cin >> N ;
	int a[N];
	k = 0;
	j = 0;
	for (i = 0; i < N; i++) cin >> a[i];
	sort(a, a + N, greater<int>());
	for (i = N-1; i >0; i--) {
		j += a[i] - a[i - 1];
		
	}
	if (j % 2 == 0) K = 1;
	if(k==0)	cout << "first";
	else cout << "second";
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:25: error: 'K' was not declared in this scope
   21 |         if (j % 2 == 0) K = 1;
      |                         ^
Language: C++

/*
オーダー
10**6	余裕を持って間に合う	
10**7	おそらく間に合う	余裕を持って間に合う
10**8	非常にシンプルな処理でない限り厳しい	おそらく間に合う
10**9		非常にシンプルな処理でない限り厳しい
logn	:OK
n		:10^7
nlogn	:10^6
n**2	:10^4
n**3	:300
2**n	:20
n!		:10



// 各桁の和を計算する関数
int findSumOfDigits(int n) {
  int sum = 0;
  while (n > 0) { // n が 0 になるまで
    sum += n % 10;
    n /= 10;
  }
  return sum;
}

sort(a, a + N, greater<int>());  // a[0:N] を大きい順にソート

int num[110] = {0};  // バケット
for (int i = 0; i < N; ++i) {
    num[d[i]]++;  // d[i] が 1 個増える
}

map<string, int> mp; // 連想配列 map<キー型, 値型> オブジェクト名
for (int i = 0; i < N; ++i) {
    auto itr = mp.find(s[i]);        // s[i] が設定されているか？
    if(itr != mp.end() ) {
         mp[s[i]] += 1;
    }
    else {
         mp[s[i]] += 1 ;
    }
}
stack<int> s;	//intをデータとするスタックを用意
s.push(1);		//{} -> {1}
printf("%d\n", s.top());	// 3
s.pop();

queue<int> que;	//intをデータとするキューを用意
que.push(1);		//{} -> {1}
printf("%d\n", que.front());	// 1
que.pop();
*/
#include <iostream>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <bitset>

using namespace std;

// #define for(i,a,b) for (int i=(a);i<(b);++i)
typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(long long i = 0; i < (long long)(n); i++)
#define pb push_back // vectorに要素追加
#define INF (ll)1e18
// int 
// // 各桁の和を計算する関数
// int findSumOfDigits(int n) {
//   int amari = 0;
//   int keta = 0;
//   while (n > 0) { // n が 0 になるまで
//     amari += n % 2;
//     if (keta%2==0)
//     n /= 10;
//   }
//   return sum;
// }
 
 

int main() {
	// 入力
	ll N;
	cin >> N;
	ll a[N];
	for (ll i = 0; i < N; ++i) cin >> a[i];
 
	// 解法
	
	sort(a, a + N, greater<ll>());
	if (N==1){
		if (a[0]%2==0) cout << "second" << endl;
		else cout << "first" << endl;
		
	}
	else if (a[0]!=a[1]){
		if ((a[0]-a[1])%2==0) cout << "second" << endl;
		else cout << "first" << endl;
	}
	else{
		ll tmp = a[0];
		ll count = 0;
		ll i = 1;
		while (a[i]==tmp) count++;
		if (count%2==0) cout << "first" << endl;
		else cout << "second" << endl;
			
		}
	}
}


Compiler output:
a.cc:117:1: error: expected declaration before '}' token
  117 | }
      | ^
Language: C

#include <stdio.h>

int main(void){
    int turn = 1;
    int i = 0;
    int flag = 1;
    long long int n;
    int a[100000];
    int c1 = 0;
    int c2 = 0;
    long long int val = 0;

    scanf("%llx",&n);

    for(i = 0;i < n;i++){
        scanf("%llx",&val);
        a[i] = val % 2;
    }

    for(i = 0;i < n;i++){
        if(a[i] == 0){
            c1++;
        }else{
            c2++;
        } 
    }

    turn = c%2; 

    if(turn == (1)){
        printf("first\n");
    }else{
        printf("second\n");
    }
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:28:12: error: 'c' undeclared (first use in this function); did you mean 'c2'?
   28 |     turn = c%2;
      |            ^
      |            c2
main.c:28:12: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <bits/stdc++.h>

using namespace std;

set <int> s;

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

    int cnt = 0;
    
    for(int i=0;i<n;i++)
    {
        cin >> x;

        if(x%2)
            cnt = 1;
    }

    if(cnt)
        cout << "first\n";
    else
        cout << "second\n";
}

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

#include <bits/stdc++.h>
 using namespace std;
#define FIO                     ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define mod                     1000000007
#define eps                     1e-9
#define setbits                 __builtin_popcount
#define gcd                     __gcd
#define rep(i,a,b)              for(int i=a;i<=b;i++)
#define repr(i,b,a)             for(int i=b;i>=a;i--)
#define forn(i,n)               for(int i=0;i<n;i++)
#define all(a)                  a.begin(), a.end()
#define pb                      push_back
#define endl                    "\n"
#define ff                      first
#define ss                      second
#define asort(c)                sort(all(c)) 
#define lbpos(x,v)              (int)(lower_bound(all(v),x)-v.begin())//=v.size()==>No LB 
#define ubpos(x,v)              (int)(upper_bound(all(v),x)-v.begin())//=v.size()==>No UB
#define PI                      3.14159265358979323846
#define int                     long long
typedef  vector<int>                 vi;
typedef  pair<int, int>              ii;
typedef  vector<ii>                 vii;
typedef  long double                 ld;
#define debug(...) ZZ(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1> void ZZ(const char* name, Arg1&& arg1){std::cerr << name << " = " << arg1 << endl;}
template <typename Arg1, typename... Args>void ZZ(const char* names, Arg1&& arg1, Args&&... args)
{
  const char* comma = strchr(names + 1, ',');
  std::cerr.write(names, comma - names) << " = " << arg1;
  ZZ(comma, args...);
}
clock_t time_p=clock();
void timer()
{
    time_p=clock()-time_p;
    cerr<<"Execution Time: "<<(double)(time_p)/CLOCKS_PER_SEC<<"\n";
}

int32_t main()
{
  FIO;

  
  int n,x,mi=1000000000000;
  bool ev=false;
  cin>>n;
  forn(i,n)
  {
    cin>>x;
    if(x%2==0)
      ev=true;
    mi=min(mi,x);
  }
  //cout<<mi<<endl;
  if(mi&1 and ev)
    cout<<"first";
  else(mi&1 and !ev)
    cout<<"second";
  else if(mi%2==0)
    cout<<"second";
  timer();
  return 0;
}  

Compiler output:
a.cc: In function 'int32_t main()':
a.cc:58:21: error: expected ';' before 'cout'
   58 |   else(mi&1 and !ev)
      |                     ^
      |                     ;
   59 |     cout<<"second";
      |     ~~~~             
a.cc:60:3: error: 'else' without a previous 'if'
   60 |   else if(mi%2==0)
      |   ^~~~
Language: C++

#include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <math.h>
#include <algorithm>
using namespace std;
#define ll long long
const double EPS = 1e-10;

int main(){
  ll n;
  cin>>n;
  ll z;
  if(n==1){
    cin>>z;
    if(z&1){
      cout<<"first"<<endl;
    }
    else{
      cout<<"second"<<endl;
    }
    return 0;
  }
  vector<ll> a;
  for(ll i=0;i<n;i++){
    cin>>z;
    a.push_back(z);
  }
  ll ans=0;
  sort(a.begin(),a.end());
  for(ll i=0;i<n-2;i++){
    ans=ans^((a[i+1]-a[i])&1);
  }
  if((a[n-1]-a[n-2])!=1)ans=ans^((a[i+1]-a[i])&1);
  if(ans&1){
    cout<<"first"<<endl;
  }
  else{
    cout<<"second"<<endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:37:37: error: 'i' was not declared in this scope
   37 |   if((a[n-1]-a[n-2])!=1)ans=ans^((a[i+1]-a[i])&1);
      |                                     ^
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <deque>
#include <cctype>
#include <cstdio>
#include <math.h>
#include <set>
using namespace std;
using ll = long long;
int main() {
    ll n;
    cin >> n;
    vector<ll> a(n);
    ll even = 0;
    ll odd = 0;
    for(ll i=0;i<n;i++){
        cin >> a[i];
        if(a[i]%==2){
            even++;
        }else{
            odd++;
        }
    }
    sort(a.begin(),a.end());
   if(n%2==0){
       if(odd%2==0&& even%2==0){
           cout << "first" << endl;
       }else{
           cout <<"second" << endl;
       }
   }else{
         if(odd%2==0&& even%2==0){
          cout <<"second" << endl;
       }else{
           cout << "first" << endl;
       }
   }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:18: error: expected primary-expression before '=' token
   21 |         if(a[i]%==2){
      |                  ^
Language: C++

/*
オーダー
10**6	余裕を持って間に合う	
10**7	おそらく間に合う	余裕を持って間に合う
10**8	非常にシンプルな処理でない限り厳しい	おそらく間に合う
10**9		非常にシンプルな処理でない限り厳しい
logn	:OK
n		:10^7
nlogn	:10^6
n**2	:10^4
n**3	:300
2**n	:20
n!		:10



// 各桁の和を計算する関数
int findSumOfDigits(int n) {
  int sum = 0;
  while (n > 0) { // n が 0 になるまで
    sum += n % 10;
    n /= 10;
  }
  return sum;
}

sort(a, a + N, greater<int>());  // a[0:N] を大きい順にソート

int num[110] = {0};  // バケット
for (int i = 0; i < N; ++i) {
    num[d[i]]++;  // d[i] が 1 個増える
}

map<string, int> mp; // 連想配列 map<キー型, 値型> オブジェクト名
for (int i = 0; i < N; ++i) {
    auto itr = mp.find(s[i]);        // s[i] が設定されているか？
    if(itr != mp.end() ) {
         mp[s[i]] += 1;
    }
    else {
         mp[s[i]] += 1 ;
    }
}
stack<int> s;	//intをデータとするスタックを用意
s.push(1);		//{} -> {1}
printf("%d\n", s.top());	// 3
s.pop();

queue<int> que;	//intをデータとするキューを用意
que.push(1);		//{} -> {1}
printf("%d\n", que.front());	// 1
que.pop();
*/
#include <iostream>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <bitset>

using namespace std;

// #define for(i,a,b) for (int i=(a);i<(b);++i)
typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(long long i = 0; i < (long long)(n); i++)
#define pb push_back // vectorに要素追加
#define INF (ll)1e18
// int 
// // 各桁の和を計算する関数
// int findSumOfDigits(int n) {
//   int amari = 0;
//   int keta = 0;
//   while (n > 0) { // n が 0 になるまで
//     amari += n % 2;
//     if (keta%2==0)
//     n /= 10;
//   }
//   return sum;
// }
 
 

int main() {
	// 入力
	ll N;
	cin >> N;
	ll a[N];
	for (ll i = 0; i < N; ++i) cin >> a[i];
 
	// 解法
	
	sort(a, a + N, greater<ll>());
	if (N==1){
		if (a[0]%2==0) cout << "second" << endl;
		else cout << "first" << endl;
		
	}
	else if (a[0]!=a[1]){
		if ((a[0]-a[1])%2==0) cout << "second" << endl;
		else cout << "first" << endl;
	}
	else{
		ll tmp = a[0];
		ll count = 0;
		ll i = 1;
		while (a[i]==target) count++;
		if (count%2==0) cout << "first" << endl;
		else cout << "second" << endl;
			
		}
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:111:30: error: 'target' was not declared in this scope
  111 |                 while (a[i]==target) count++;
      |                              ^~~~~~
a.cc: At global scope:
a.cc:117:1: error: expected declaration before '}' token
  117 | }
      | ^
Language: C++

/*
オーダー
10**6	余裕を持って間に合う	
10**7	おそらく間に合う	余裕を持って間に合う
10**8	非常にシンプルな処理でない限り厳しい	おそらく間に合う
10**9		非常にシンプルな処理でない限り厳しい
logn	:OK
n		:10^7
nlogn	:10^6
n**2	:10^4
n**3	:300
2**n	:20
n!		:10



// 各桁の和を計算する関数
int findSumOfDigits(int n) {
  int sum = 0;
  while (n > 0) { // n が 0 になるまで
    sum += n % 10;
    n /= 10;
  }
  return sum;
}

sort(a, a + N, greater<int>());  // a[0:N] を大きい順にソート

int num[110] = {0};  // バケット
for (int i = 0; i < N; ++i) {
    num[d[i]]++;  // d[i] が 1 個増える
}

map<string, int> mp; // 連想配列 map<キー型, 値型> オブジェクト名
for (int i = 0; i < N; ++i) {
    auto itr = mp.find(s[i]);        // s[i] が設定されているか？
    if(itr != mp.end() ) {
         mp[s[i]] += 1;
    }
    else {
         mp[s[i]] += 1 ;
    }
}
stack<int> s;	//intをデータとするスタックを用意
s.push(1);		//{} -> {1}
printf("%d\n", s.top());	// 3
s.pop();

queue<int> que;	//intをデータとするキューを用意
que.push(1);		//{} -> {1}
printf("%d\n", que.front());	// 1
que.pop();
*/
#include <iostream>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <bitset>

using namespace std;

// #define for(i,a,b) for (int i=(a);i<(b);++i)
typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(long long i = 0; i < (long long)(n); i++)
#define pb push_back // vectorに要素追加
#define INF (ll)1e18
// int 
// // 各桁の和を計算する関数
// int findSumOfDigits(int n) {
//   int amari = 0;
//   int keta = 0;
//   while (n > 0) { // n が 0 になるまで
//     amari += n % 2;
//     if (keta%2==0)
//     n /= 10;
//   }
//   return sum;
// }
 
 

int main() {
	// 入力
	ll N;
	cin >> N;
	ll a[N];
	for (ll i = 0; i < N; ++i) cin >> a[i];
 
	// 解法
	
	sort(a, a + N, greater<ll>());
	if (N==1){
		if (a[0]%2==0) cout << "second" << endl;
		else cout << "first" << endl;
		
	}
	else if (a[0]!=a[1]){
		if ((a[0]-a[1])%2==0) cout << "second" << endl;
		else cout << "first" << endl;
	}
	else{
		ll tmp = a[0];
		ll count = 0;
		ll i = 1;
		while (a[i]==target) count++;
		if (count%2==0) cout << "second" << endl;
		else cout << "first" << endl;
			
		}
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:111:30: error: 'target' was not declared in this scope
  111 |                 while (a[i]==target) count++;
      |                              ^~~~~~
a.cc: At global scope:
a.cc:117:1: error: expected declaration before '}' token
  117 | }
      | ^
Language: C++

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <functional>
#include <list>
#include <bitset>
#include <numeric>
#include <utility>
#define INF 1e9
#define MOD 1000000007
#define ll long long
using namespace std;
typedef unsigned long long ull;
typedef pair<int, int> pr;


int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n;
    cin>>n;
    vector<int>a(n);
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    int ans=0;
    bool b=false;
    int max=0;
    for(int i=0;i<n;i++){
        if(a[i]==1){b=true;}
        ans+=a%2;
    }
    if(b){
        cout<<"first"<<endl;
    }
    if(ans%2==1){
        cout<<"first"<<endl;
        return 0;
    }
    cout<<"second"<<endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:35:15: error: no match for 'operator%' (operand types are 'std::vector<int>' and 'int')
   35 |         ans+=a%2;
      |              ~^~
      |              | |
      |              | int
      |              std::vector<int>
Language: C++

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <functional>
#include <list>
#include <bitset>
#include <numeric>
#include <utility>
#define INF 1e9
#define MOD 1000000007
#define ll long long
using namespace std;
typedef unsigned long long ull;
typedef pair<int, int> pr;


int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n,a;
    cin>>n;
    vector<int>a(n);
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    int ans=0;
    bool b=false;
    int max=0;
    for(int i=0;i<n;i++){
        if(a[i]==1){b=true;}
        ans+=a%2;
    }
    if(b){
        cout<<"first"<<endl;
    }
    if(ans%2==1){
        cout<<"first"<<endl;
        return 0;
    }
    cout<<"second"<<endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:16: error: conflicting declaration 'std::vector<int> a'
   26 |     vector<int>a(n);
      |                ^
a.cc:24:11: note: previous declaration as 'int a'
   24 |     int n,a;
      |           ^
a.cc:28:15: error: invalid types 'int[int]' for array subscript
   28 |         cin>>a[i];
      |               ^
a.cc:34:13: error: invalid types 'int[int]' for array subscript
   34 |         if(a[i]==1){b=true;}
      |             ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#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++)


int main(){
  int n; cin >> n;
  int sum = 0;
  rep(i, n){
    int a; cin >> a;
    sum += a;
  }
  if(n % 2 == 0 && sum % 2 == 1 sum % 3 != 0) cout << "first" << endl;
  else cout << "second" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:32: error: expected ')' before 'sum'
   19 |   if(n % 2 == 0 && sum % 2 == 1 sum % 3 != 0) cout << "first" << endl;
      |     ~                          ^~~~
      |                                )
Language: C++

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


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

   long long a;
   int cnt1=0;
   for (int i = 0; i < n; ++i){
      cin>>a;
      if(a%2==0)
         cnt1++;
   }

   int cnt2=n-ctn1;
   
   if(cnt1==0)
      cout<<"second"<<endl;
   else if(cnt2==0)
      cout<<"first"<<endl;
   else
      cout<<"first"<<endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:15: error: 'ctn1' was not declared in this scope; did you mean 'cnt1'?
   17 |    int cnt2=n-ctn1;
      |               ^~~~
      |               cnt1
Language: C++

#include <iostream>
#include <string>

int main(){
  int N, tmp;
  int ret = 0;
  for (int i=0; i<N; i++){
    cin >> tmp;
    ret += tmp % 2;
  }
  if (ret % 2 == 0) cout << "second" << endl;
  else cout << "first" << endl;
 
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |     cin >> tmp;
      |     ^~~
      |     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:11:21: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   11 |   if (ret % 2 == 0) cout << "second" << 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:11:41: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   11 |   if (ret % 2 == 0) cout << "second" << 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)
      |     ^~~~
a.cc:12:8: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   12 |   else cout << "first" << 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:12:27: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   12 |   else cout << "first" << endl;
      |                           ^~~~
      |                           std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for(int i = a;i < n;i++)
#define INF 1e9
#define fs first
#define sc second
typedef unsigned long long ull;
typedef long long ll;


int main(){
	ll n,p;
	cin >> n;
	
	rep(i,0,n){
		cin >> p;
		if(p % 2){
			cout << second << endl;
			return 0;
		}
	}
	
	cout << first << endl;
	
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:33: error: 'second' was not declared in this scope
   18 |                         cout << second << endl;
      |                                 ^~~~~~
a.cc:23:17: error: 'first' was not declared in this scope
   23 |         cout << first << endl;
      |                 ^~~~~
Language: C++

 #include "bits/stdc++.h"

using namespace std;

#define sp(x) cout<<setprecision(x);
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define all(a) (a).begin(), (a).end()
#define inf 10000000
#define linf INT64_MAX*0.99
#define print(s) cout<<(s)<<endl

typedef pair<int, int> P;
typedef long long ll;
 
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n; cin>>n;
    vector<ll> a(n);
    REP(i,n) cin>>a[i];
    sort<all(a)>;
    if (a[0]%2 == 0) print("second");
    else print("first");
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:25: error: call to non-'constexpr' function 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::begin() [with _Tp = long long int; _Alloc = std::allocator<long long int>; iterator = std::vector<long long int>::iterator]'
    8 | #define all(a) (a).begin(), (a).end()
      |                ~~~~~~~~~^~
a.cc:22:10: note: in expansion of macro 'all'
   22 |     sort<all(a)>;
      |          ^~~
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:873:7: note: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::begin() [with _Tp = long long int; _Alloc = std::allocator<long long int>; iterator = std::vector<long long int>::iterator]' declared here
  873 |       begin() _GLIBCXX_NOEXCEPT
      |       ^~~~~
a.cc:8:36: error: call to non-'constexpr' function 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::end() [with _Tp = long long int; _Alloc = std::allocator<long long int>; iterator = std::vector<long long int>::iterator]'
    8 | #define all(a) (a).begin(), (a).end()
      |                             ~~~~~~~^~
a.cc:22:10: note: in expansion of macro 'all'
   22 |     sort<all(a)>;
      |          ^~~
/usr/include/c++/14/bits/stl_vector.h:893:7: note: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::end() [with _Tp = long long int; _Alloc = std::allocator<long long int>; iterator = std::vector<long long int>::iterator]' declared here
  893 |       end() _GLIBCXX_NOEXCEPT
      |       ^~~
a.cc:22:5: error: statement cannot resolve address of overloaded function
   22 |     sort<all(a)>;
      |     ^~~~~~~~~~~~
Language: C++

#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>
#include <queue>
#include <set>
#include <algorithm>

using namespace std;

int main()
{
    int n;
    cin >> n;
    vector<int> a(n);
    bool flag = true;
    bitset<100000> bit;
    bit.reset();
    for (int i = 0; i < n; ++i){
        cin >> a[i];
    }
    for (int i = 0; i < n; ++i){
        if(a[i] % 2 != 0){
            bit[i] = 1;
        }
    }
    if(bit.none() || bit.any()){
        flag = false;
    }
    string ans;
    ans = flag ? "first" : "second";
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:5: error: 'bitset' was not declared in this scope
   17 |     bitset<100000> bit;
      |     ^~~~~~
a.cc:8:1: note: 'std::bitset' is defined in header '<bitset>'; this is probably fixable by adding '#include <bitset>'
    7 | #include <algorithm>
  +++ |+#include <bitset>
    8 | 
a.cc:17:20: error: 'bit' was not declared in this scope
   17 |     bitset<100000> bit;
      |                    ^~~
Language: C

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

int cmp(const void *a, const void *b) {
    return *(unsigned long *)b - *(unsigned long *)a;
}

int main() {
    int i, n, kyoko = 0;
    unsigned long /**a,*/ first, second, tmp;

    if(!scanf("%d", &n)){return 0;}
    a = (unsigned long *)malloc(n * sizeof(unsigned long));
    
    for (i = 0; i < n; i++) {
        if(!scanf("%lu", &tmp)) {return 0;}
        if(tmp%2 == 0) {kyoko++;}
        //a[i] = tmp;
    }

    //qsort(a, n, sizeof(unsigned long), cmp);

    if (kyoko%2 != 0) {puts("first");}
    else {puts("second");}

    //free(a);
    
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:13:5: error: 'a' undeclared (first use in this function)
   13 |     a = (unsigned long *)malloc(n * sizeof(unsigned long));
      |     ^
main.c:13:5: note: each undeclared identifier is reported only once for each function it appears in