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

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef long long ll;

const int N = 1e5+5;
ll A[N];
a[N];

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int n;
	cin >> n;
	for(int i = 1; i <= n; ++i)
		cin >> A[i];
	int m;
	ll k;
	cin >> m >> k;
	for(int i = 0; i < m; ++i)
		cin >> a[i];
	k %= 4;
	while(k--)
		for(int i = 0; i < m; ++i)
			A[a[i]] = A[a[i]-1] + A[a[i]+1] - A[a[i]];
	for(int i = 1; i <= n; ++i)
		cout << A[i] << "\n";
}


Compiler output:
a.cc:13:1: error: 'a' does not name a type
   13 | a[N];
      | ^
a.cc: In function 'int main()':
a.cc:25:24: error: 'a' was not declared in this scope
   25 |                 cin >> a[i];
      |                        ^
a.cc:29:27: error: 'a' was not declared in this scope
   29 |                         A[a[i]] = A[a[i]-1] + A[a[i]+1] - A[a[i]];
      |                           ^
Language: C++

#include<iostream>
#include<iomanip>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<vector>
#include<array>
#include<string>
#include<stack>
#include<queue>
#include<algorithm>
#include<cassert>
#include<functional>
#include<random>
#include<complex>
#include<bitset>
#include<chrono>
//#include<boost/multiprecision/cpp_int.hpp>
#define int int64_t
#define uint uint64_t
#define REP(i, a, b) for (int64_t i = (int64_t)(a); i < (int64_t)(b); i++)
#define rep(i, a) REP(i, 0, a)
#define EACH(i, a) for (auto i: a)
#define ITR(x, a) for (auto x = a.begin(); x != a.end(); x++)
#define ALL(a) (a.begin()), (a.end())
#define HAS(a, x) (a.find(x) != a.end())
#define Min(x) *min_element(ALL(x))
#define Max(x) *max_element(ALL(x))
#define Unique(L) (L.erase(unique(ALL(L)), L.end()))
#define veccat(v1, v2) std::copy((v2).begin(),(v2).end(),std::back_inserter(v1))
#define intmax (std::numeric_limits<int64_t>::max() / 4)
using namespace std;
//typedef boost::multiprecision::cpp_int bigint;
const double EPS = 1e-9;
const double PI = acos(-1.0);

vector<int> prod_perm(const vector<int>&a, const vector<int> &b) {
	//bに置換aを実行して返す。
	//すなわち、[0..N]→a になるような置換"→"によって、
	//b→ansとなるようなansを求めて返す。

	assert(a.size() == b.size());

	vector<int>ans(b.size());
	rep(i, b.size())ans[i] = b[a[i]];
	return ans;
}

vector<int> pow_perm(const vector<int>&perm, const int K) {
	//置換permのK乗を返す。

	if (K == 0) {
		vector<int>ans(K - 1);
		rep(i, ans.size())ans[i] = i;
		return ans;
	}
	if (K == 1)return perm;

	vector<int>half = pow_perm(perm, K / 2);

	if (K % 2 == 0)return prod_perm(half, half);
	else return prod_perm(prod_perm(half, half), perm);
}

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int N, M, K;
	cin >> N;
	int x[100000];
	rep(i, N)cin >> x[i];
	cin >> M >> K;
	int a[100000];
	rep(i, M)cin >> a[i];

	int perm[100000];
	rep(i, N - 1)perm[i] = i;
	rep(i, M)swap(perm[a[i] - 2], perm[a[i] - 1]);
	auto permK = pow_perm(perm, K);

	int dx[100000];
	rep(i, N - 1)dx[i] = x[i + 1] - x[i];

	int ans = x[0];
	rep(i, N - 1) {
		cout << ans << endl;
		ans += dx[permK[i]];
	}
	cout << ans << endl;


	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:81:31: error: invalid initialization of reference of type 'const std::vector<long int>&' from expression of type 'int64_t [100000]' {aka 'long int [100000]'}
   81 |         auto permK = pow_perm(perm, K);
      |                               ^~~~
a.cc:50:40: note: in passing argument 1 of 'std::vector<long int> pow_perm(const std::vector<long int>&, int64_t)'
   50 | vector<int> pow_perm(const vector<int>&perm, const int K) {
      |                      ~~~~~~~~~~~~~~~~~~^~~~
Language: C++

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

#define rep(i,x,y) for(int i=(x);i<(y);++i)
#define debug(x) #x << "=" << (x)

#ifdef DEBUG
#define _GLIBCXX_DEBUG
#define print(x) std::cerr << debug(x) << " (L:" << __LINE__ << ")" << std::endl
#else
#define print(x)
#endif

const int inf=1e9;
const int64_t inf64=1e18;
const double eps=1e-9;

template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec){
    os << "[";
    for (const auto &v : vec) {
    	os << v << ",";
    }
    os << "]";
    return os;
}

void solve(){
    int n;
    cin >> n;
    vector<int64_t> x(n),y;
    rep(i,0,n) cin >> x[i];
    y=x;
    int m;
    int64_t k;
    cin >> m >> k;
    vector<int64_t> a(m);
    rep(i,0,m){
        cin >> a[i];
        --a[i];
    }

    int64_t loop=n-1;
    vector<int> diff(n-1);
    rep(i,0,n-1) diff[i]=x[i+1]-x[i];
    vector<int> ans(n);
    ans[0]=x[0];
    ans[n-1]=x[n-1];
    rep(i,1,n) ans[i]=diff[(i+k%loop)%n]);
    rep(i,0,n) cout << ans[i] << endl;
}

int main(){
    std::cin.tie(0);
    std::ios::sync_with_stdio(false);
    cout.setf(ios::fixed);
    cout.precision(10);
    solve();
    return 0;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:48:41: error: expected ';' before ')' token
   48 |     rep(i,1,n) ans[i]=diff[(i+k%loop)%n]);
      |                                         ^
      |                                         ;
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define all(c) c.begin(),c.end()
#define pb push_back
#define fs first
#define sc second
#define show(x) cout << #x << " = " << x << endl
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
using namespace std;
template<class S,class T> ostream& operator<<(ostream& o,const pair<S,T> &p){return o<<"("<<p.fs<<","<<p.sc<<")";}
template<class T> ostream& operator<<(ostream& o,const vector<T> &vc){o<<"sz = "<<vc.size()<<endl<<"[";for(const T& v:vc) o<<v<<",";o<<"]";return o;}
typedef long long ll;
int N,M;
ll K;
ll x[100000];
int s[100000];
int ans[100000];
bool vis[100000];
int main(){
	cin>>N;
	rep(i,N) cin>>x[i];
	rep(i,N) x[i]-=x[i+1];
	cin>>M>>K;
	rep(i,M){
		int a;
		cin>>a;
		a--;
		swap(s[a],s[a+1]);
	}
	rep(i,N-1) if(!vis[i]){
		dfs(i,-1);
		int n=0;
		int v=i;
		vector<int> vc;
		while(!vis[v]){
			vis[v]=1;
			vc.pb(v);
			v=s[v];
			n++;
		}
		ans[vc[i]]=x[vc[(i+K)%n]];
	}
	double sum=0;
	rep(i,N){
		sum+=ans[i];
		cout<<sum<<endl;
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:33:17: error: 'dfs' was not declared in this scope; did you mean 'ffs'?
   33 |                 dfs(i,-1);
      |                 ^~~
      |                 ffs
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<typename T> using Graph = vector<vector<T>>;

#define REP(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, a) REP(i, 0, a)
#define EACH(i, a) for (auto i: a)
#define ITR(x, a) for (__typeof(a.begin()) x = a.begin(); x != a.end(); x++)
#define ALL(a) (a.begin()), (a.end())
#define HAS(a, x) (a.find(x) != a.end())
#define endl '\n'

const int eps = 1e-9;
int N;
ll x[100005], y[100005];
int M;
ll K k;
int a[100005];

bool same(ll x[], ll y[]) {
  rep(i, N) if (x[i] != y[i]) return false;
  return true;
}

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

  cin >> N;
  rep(i, N) cin >> x[i], y[i] = x[i];
  cin >> M >> K;
  k = K;
  rep(i, M) cin >> a[i], a[i]--;

  int cnt = 0;
  while (k--) {
    rep(i, M) {
      y[a[i]] = y[a[i] - 1] + y[a[i] + 1] - y[a[i]];
    } 
    cnt++;
    if (same(x, y)) break;
  }
  
  if (k > 0) {
    K %= cnt;
    while (K--) {
      rep(i, M) {
        x[a[i]] = x[a[i] - 1] + x[a[i] + 1] - x[a[i]];
      } 
    }
    rep(i, N) printf("%.10f\n", (double)x[i]);
  } else {
    rep(i, N) printf("%.10f\n", (double)y[i]);
  }


  return 0;
}


Compiler output:
a.cc:18:6: error: expected initializer before 'k'
   18 | ll K k;
      |      ^
a.cc: In function 'int main()':
a.cc:32:15: error: 'K' was not declared in this scope
   32 |   cin >> M >> K;
      |               ^
a.cc:33:3: error: 'k' was not declared in this scope
   33 |   k = K;
      |   ^
Language: C++

#include <cstdio>
#include <algorithm>
#include <map>
using namespace std;
namespace {
int x[100000];
int a[100000];
using S = map<int, int>;
S op(const S &p, const S &q, const S &r) { // p + q - r
    S ans;
    for(auto i : p)
        ans[i.first] += i.second;
    for(auto i : q)
        ans[i.first] += i.second;
    for(auto i : r)
        ans[i.first] -= i.second;
    for(auto i = ans.begin(); i != ans.end();)
        if(i->second == 0)
            i = ans.erase(i);
        else
            ++i;
    return ans;
}
void op(const S *l, const S *r, S *out, int n) {
    for(int i = 0; i < n; i++) {
        out[i].clear();
        for(auto j : r[i])
            for(auto k : l[j.first])
                out[i][k.first] += k.second * j.second;
        for(auto i = ans.begin(); i != ans.end();)
            if(i->second == 0)
                i = ans.erase(i);
            else
                ++i;
    }
}
S s[100000];
S t[100000];
S buf[100000];
}
int main() {
    int n, m;
    long long k;
    scanf("%d", &n);
    for(int i = 0; i < n; i++)
        scanf("%d", x + i);
    scanf("%d %lld", &m, &k);
    for(int i = 0; i < m; i++) {
        scanf("%d", a + i);
        a[i]--;
    }
    for(int i = 0; i < n; i++)
        s[i][i] = t[i][i] = 1;
    for(int j = 0; j < m; j++)
        s[a[j]] = op(s[a[j] - 1], s[a[j] + 1], s[a[j]]);
    for(; k; k >>= 1) {
        if(k & 1) {
            op(s, t, buf, n);
            move(buf, buf + n, t);
        }
        op(s, s, buf, n);
        move(buf, buf + n, s);
    }
    for(int i = 0; i < n; i++) {
        long long ans = 0;
        for(auto j : t[i])
            ans += (long long) x[j.first] * j.second;
        printf("%lld\n", ans);
    }
}
 


Compiler output:
a.cc: In function 'void {anonymous}::op(const S*, const S*, S*, int)':
a.cc:30:22: error: 'ans' was not declared in this scope; did you mean 'abs'?
   30 |         for(auto i = ans.begin(); i != ans.end();)
      |                      ^~~
      |                      abs
Language: C++

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

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

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i,n) rep2(i,0,n)
#define rep2(i,m,n) for(int i=m;i<(n);i++)
#define ALL(c) (c).begin(),(c).end()

int N, M;
ll K;
int x[100010];
int k[100010];

int main() {
	scanf("%d", &N);

	rep(i, N) {
		scanf("%d", &x[i]);
	}

	scanf("%d %lld", &M, &K);

	rep(i, M) {
		scanf("%d", &k[i]);
		--k[i];
	}

	if (K>=1000000) return ;
	rep(tt, K) {
		rep(i, M) {
			x[k[i]] = x[k[i]-1]+x[k[i]+1]-x[k[i]];
		}
	}

	rep(i, N) cout << x[i] << endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:36:25: error: return-statement with no value, in function returning 'int' [-fpermissive]
   36 |         if (K>=1000000) return ;
      |                         ^~~~~~
Language: C

#include<stdio.h>

#define NMAX 100001

int x[NMAX], x_fast[NMAX], x_slow[NMAX], a[NMAX];

int main(void){
    int N, j, M;
    __int64 i, start, end, period, K;
    
    scanf("%ld", &N);
    for(j = 1; j <= N; j++){
        scanf("%ld", &(x[j]));
        x_fast[j] = x_slow[j] = x[j];
    }
    scanf("%ld", &M);
    scanf("%lld", &K);
    for(j = 0; j < M; j++) scanf("%ld", &(a[j]));

    for(i = 0; i < K; i++){
        for(j = 0; j < M; j++) x_fast[a[j]] = x_fast[a[j] - 1] + x_fast[a[j] + 1] - x_fast[a[j]];
        for(j = 0; j < M; j++) x_fast[a[j]] = x_fast[a[j] - 1] + x_fast[a[j] + 1] - x_fast[a[j]];
        for(j = 0; j < M; j++) x_slow[a[j]] = x_slow[a[j] - 1] + x_slow[a[j] + 1] - x_slow[a[j]];
        for(j = 1; j <= N; j++) if(x_fast[j] != x_slow[j]) break;
        if(j > N) break;
    }
    
    start = i;
    
    for(; i < K; i++){
        for(j = 0; j < M; j++) x_fast[a[j]] = x_fast[a[j] - 1] + x_fast[a[j] + 1] - x_fast[a[j]];
        for(j = 0; j < M; j++) x_fast[a[j]] = x_fast[a[j] - 1] + x_fast[a[j] + 1] - x_fast[a[j]];
        for(j = 0; j < M; j++) x_slow[a[j]] = x_slow[a[j] - 1] + x_slow[a[j] + 1] - x_slow[a[j]];
        for(j = 1; j <= N; j++) if(x_fast[j] != x_slow[j]) break;
        if(j > N) break;
    }
    
    end = i;
    
    period = end - start;
    
    K = (K - i) % period;
    
    for(i = 0; i < K; i++){
        for(j = 0; j < M; j++) x_slow[a[j]] = x_slow[a[j] - 1] + x_slow[a[j] + 1] - x_slow[a[j]];
    }
    
    for(j = 1; j <= N; j++){
        printf("%ld\n", x_slow[j]);
    }
    
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:9:5: error: unknown type name '__int64'; did you mean '__int64_t'?
    9 |     __int64 i, start, end, period, K;
      |     ^~~~~~~
      |     __int64_t
Language: C++

#include<bits/stdc++.h>
using namespace std;
long long mod = 1e9 + 9;
int a[100005], h[100005];
map<long long, int> M;
int n, m;
long long k;

long long v[100005];

long long hash() {
	long long res = 0;
	for (int i = 0; i < n; i++)
		res = ((res * v[i]) % mod + a[i]) % mod;
	return res;
}

int main() {
	ios::sync_with_stdio(false);

	scanf("%d", &n);
	for (int i = 0; i < n; i++)
		v[i] = rand() % mod;
	for (int i = 0; i < n; i++)
		scanf("%d", a + i);
	scanf("%d%lld", &m, &k);
	for (int i = 0; i < m; i++)
		scanf("%d", h + i), h[i]--;

	M[hash()] = 0;

	bool d = true;
	for (long long x = 0; x < k; ) {
		for (int i = 0; i < n; i++)
			a[h[i]] = a[h[i] - 1] + a[h[i] + 1] - a[h[i]];
		x++;
		if (d || x < k) {
			d = false;
			long long hsh = hash();
			if (M.find(hsh) != M.end()) {
				long long len = x - M[hsh];
				x += ((k - x) / len) * len;
			}
			else
				M[hsh] = x;
		}
	}
	for (int i = 0; i < n; i++)
		printf("%d\n", a[i]);

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:11: error: reference to 'hash' is ambiguous
   30 |         M[hash()] = 0;
      |           ^~~~
In file included from /usr/include/c++/14/string_view:50,
                 from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/functional_hash.h:59:12: note: candidates are: 'template<class _Tp> struct std::hash'
   59 |     struct hash;
      |            ^~~~
a.cc:11:11: note:                 'long long int hash()'
   11 | long long hash() {
      |           ^~~~
a.cc:39:41: error: reference to 'hash' is ambiguous
   39 |                         long long hsh = hash();
      |                                         ^~~~
/usr/include/c++/14/bits/functional_hash.h:59:12: note: candidates are: 'template<class _Tp> struct std::hash'
   59 |     struct hash;
      |            ^~~~
a.cc:11:11: note:                 'long long int hash()'
   11 | long long hash() {
      |           ^~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:5:17: error: 'n' was not declared in this scope; did you mean 'yn'?
    5 |     scanf("%d",&n);
      |                 ^
      |                 yn
Language: C++

#include<bits/stdc++.h>
using namespace std;
int a[400005],n;
int small(int i,int k)
{
    return a[i+1]<=k&&a[i]<=k;//判断小于等于 
}
int big(int i,int k)
{
    return a[i+1]>k&&a[i]>k;//判断大于
}
int check(int k)
{
    for(int i=0;i<=n-1;i++)//从中心开始看是否有两个连续的1或0
    {
        if(small(n+i,k)==1||small(n-i-1,k)==1)//如果小于等于k的数在最上面
        {
            return 1;
        }
        if(big(n+i,k)==1||big(n-i-1,k)==1)如果大于k的数在最上面
        {
            return 0;
        }
    }
    if(a[1]<=k)
    {
        return 1;
    }else
    {
        return 0;
    }
}
int main()
{
    scanf("%d",&n);
    for(int i=1;i<=2*n-1;i++)
    {
        scanf("%d",&a[i]);
    }
    int l=1,r=2*n-1;//这里r是2*n-1
    while(l<r)//二分答案
    {
        int mid=(l+r)>>1;
        if(check(mid)==1)
        {
            r=mid;
        }else
        {
            l=mid+1;
        }
    }
    cout<<r;
    return 0;
}

Compiler output:
a.cc: In function 'int check(int)':
a.cc:20:43: error: '\U00005982\U0000679c\U00005927\U00004e8ek\U00007684\U00006570\U00005728\U00006700\U00004e0a\U00009762' was not declared in this scope
   20 |         if(big(n+i,k)==1||big(n-i-1,k)==1)如果大于k的数在最上面
      |                                           ^~~~~~~~~~~~~~~~~~~~~
Language: C++

/*************************************************************************
	> File Name: AT2165.cpp
	> Author: s-k-y
	> Mail: zhoutianyi0330@qq.com 
	> Created Time: 2019年11月07日 星期四 08时54分07秒
 ************************************************************************/

#include<bits/stdc++.h>
#define ll long long
#define ul unsigned long long
#define F(i,a,b) for(register long long i=a;i<=b;i++)
#define K(i,a,b) for(register long long i=a;i>=b;i--)
using namespace std;
ll a[1000001],n,f[1000001],t,k,l,r,o;
ll pd(ll x){
	t=0;
	if(a[1]>x)f[1]=1;
	else f[1]=0;
	o=f[1];
	F(i,2,n*2-1){
		if(a[i]>x)f[i]=1;
		else f[i]=0;
		if(t==0){
			if(f[i]==f[i-1]){
				t=i;
				o=f[i];
			}
		}
		else if(f[i]==f[i-1]&&abs(n-i)<abs(n-t)){
			t=i;
			o=f[i];
		}
	}
	return o;
}
int main(){
	cin>>n;
	F(i,1,n*2-1)cin>>a[i];
	l=1;r=n*2-1;
	while(l<r){
		ll mid=(l+r)>>1;
		if(pd(b[mid])==0){
			r=mid;
		}
		else l=mid+1;
	}
	cout<<r;
	return 0;
}

Compiler output:
a.cc: In function 'long long int pd(long long int)':
a.cc:20:11: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   20 |         F(i,2,n*2-1){
      |           ^
a.cc:11:41: note: in definition of macro 'F'
   11 | #define F(i,a,b) for(register long long i=a;i<=b;i++)
      |                                         ^
a.cc: In function 'int main()':
a.cc:38:11: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   38 |         F(i,1,n*2-1)cin>>a[i];
      |           ^
a.cc:11:41: note: in definition of macro 'F'
   11 | #define F(i,a,b) for(register long long i=a;i<=b;i++)
      |                                         ^
a.cc:42:23: error: 'b' was not declared in this scope
   42 |                 if(pd(b[mid])==0){
      |                       ^
Language: C++

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

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

const int N = 1e5 + 10, inf = 1e6;


int main()
{
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	int n;
	cin >> n;
	for (int i = 0; i < n + n - 1; i++)
		cin >> a[i];
	int ans;
	for (int i = 1; i < n + n - 2; i++)
	{
		if(a[i] <= a[i + 1] && a[i] >= a[i - 1])
			ans = a[i];
		else if(a[i] >= a[i + 1] && a[i] <= a[i - 1])
			ans = a[i];
	}
	cout << ans << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:24: error: 'a' was not declared in this scope
   16 |                 cin >> a[i];
      |                        ^
a.cc:20:20: error: 'a' was not declared in this scope
   20 |                 if(a[i] <= a[i + 1] && a[i] >= a[i - 1])
      |                    ^
Language: C++

#include<bits/stdc++.h>
#define For(i,a,b) for(int i=a;i<=b;++i)
#define Rof(i,a,b) for(int i=a;i>=b;--i)
#define Go(x) for(int i=First[x];i;i=Next[i])
#define mp maxe_pair
#define fi first
#define se second
typedef long long longint;
using namespace std;
/*************head*************/
const int MAXN=1e5+10;
bool t[2*MAXN];
int n,f[2*MAXN];
inline int Read()
{
	char c=getchar();
	int f=1,x=0;
	while(c<'0'||c>'9'){if(c=='-') f=-1;c=getchar();}
	while(c>='0'&&c<='9') x=(x<<3)+(x<<1)+c-'0',c=getchar();
	return f*x;
}
inline Init(int x)
{
	For(i,1,(n<<1)-1)
		t[i]=(f[i]<=x);
}
inline bool Check(int x)
{
	Init(x);
    for(int i=1;i<n-1;i++)
	{
		if(t[n-i]==t[n-i+1]) return t[n-i];
		if(t[n+i]==t[n+i-1]) return t[n+i];
    }
	return t[1];
}
int main()
{
	n=Read();
	For(i,1,(n<<1)-1)
		f[i]=Read();
	int l=1,r=(n<<1)-1,Mid;
	while(l<r)
	{
		Mid=(l+r)>>1;
		if(Check(Mid))
			r=Mid;
		else
			l=Mid+1;
	}
	printf("%d\n",l);
}

Compiler output:
a.cc:22:8: error: ISO C++ forbids declaration of 'Init' with no type [-fpermissive]
   22 | inline Init(int x)
      |        ^~~~
a.cc: In function 'int Init(int)':
a.cc:26:1: warning: no return statement in function returning non-void [-Wreturn-type]
   26 | }
      | ^
Language: C++

#include <iostream>
using namespace std;
int a[200005],n;
bool b[200005];
bool pd(int x){for(int i=1;i<=n*2-1;i++) b[i]=(a[i]>=x);b[0]=b[1];
	for(int i=n;i<=n+n;i++){if(b[i]==b[i+1])return b[i];if(b[n+n-i]==b[n+n-i-1])return b[n+n-i];}
}
int main(){
cin>>n;
for(int i=1;i<=n*2-1;i++)cin>>a[i];
int l=1,r=n*2,A=0,md;
while(l<=r){md=(l+r)/2;if(pd(md))l=md+1,A=md;elser=md-1;}cout<<A;}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:46: error: 'elser' was not declared in this scope
   12 | while(l<=r){md=(l+r)/2;if(pd(md))l=md+1,A=md;elser=md-1;}cout<<A;}
      |                                              ^~~~~
a.cc: In function 'bool pd(int)':
a.cc:7:1: warning: control reaches end of non-void function [-Wreturn-type]
    7 | }
      | ^
Language: C++

#include<bits/stdc++.h>
#define For(i,a,b) for(int i=a;i<=b;++i)
#define Rof(i,a,b) for(int i=a;i>=b;--i)
#define Go(x) for(int i=First[x];i;i=Next[i])
#define mp make_pair
#define fi first
#define se second
typedef long long longint;
using namespace std;
/*************head*************/
const int MAXN=1e5+10;
bool t[2*MAXN];
int n,f[2*MAXN];
inline int Read()
{
	char c=getchar();
	int f=1,x=0;
	while(c<'0'||c>'9'){if(c=='-') f=-1;c=getchar();}
	while(c>='0'&&c<='9') x=(x<<3)+(x<<1)+c-'0',c=getchar();
	return f*x;
}
inline bool Check(int x)
{
	Init(x);
	For(i,1,n-1)
	{
		if(t[n-i]>=x&&t[n-i+1]>=x||t[n+i]>=x&&t[n+i-1]>=x) return 1;
		if(t[n-i]< x&&t[n-i+1]< x||t[n+i]< x&&t[n+i-1]< x) return 0;
	}
	return t[1]<=x;
}
int main()
{
	n=Read();
	For(i,1,n<<1-1)
		f[i]=Read();
	int l=1,r=n<<1-1,Mid;
	while(l<r)
	{
		Mid=(l+r)>>1;
		if(Check(Mid))
			r=Mid;
		else
			l=Mid+1;
	}
	printf("%d\n",l);
}

Compiler output:
a.cc: In function 'bool Check(int)':
a.cc:24:9: error: 'Init' was not declared in this scope
   24 |         Init(x);
      |         ^~~~
Language: C

#include<bits/stdc++.h>
using namespace std;
const int Max_N=1e5;
int N,A[Max_N*2+10]={},B[Max_N*2+10]={};
inline bool Chck(int x){
	if(B[N-1]==B[N]||B[N]==B[N+1]) return B[N];
	int L=N-2,R=N+2;
	for(;L>=1&&R<=2*N-1;){
		if(B[L]==B[L+1]) return B[L];
		if(B[R]==B[R-1]) return B[R];
		--L; ++R;
	} 
	return B[1];
}
int main(){
	scanf("%d",&N);
	for(int i=1;i<=2*N-1;i++) scanf("%d",&A[i]);
	int l=1,r=N;
	for(;l+1<r;){
		int mid=(l+r);
		for(int i=1;i<=2*N-1;i++) 
		 B[i]=A[i]<=mid?0:1;
		if(Chck(mid)==0) l=mid;
		else r=mid;
	}
	if(Chck(r)==0) printf("%d\n",r);
	else printf("%d\n",l);
	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++

#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream>
#include <random>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <cassert>
#include<fstream>
#include <unordered_map>
#include <cstdlib>
#include <complex>
#include <cctype>
using namespace std;
typedef string::const_iterator State;
#define Ma_PI 3.141592653589793
#define eps 0.00000001
#define LONG_INF 1e18
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define MOD 998244353
#define REP(i,n) for(long long i = 0;i < n;++i)    
#define seg_size 524288
vector<int> geko;
int solve(int now) {
	vector<int> newer;
	REP(i, geko.size()) {
		if (geko[i] >= now) {
			newer.push_back(1);
		}
		else {
			newer.push_back(0);
		}
	}
	int itr[2] = { 1e9,1e9};
	int ans[2] = {};
	int mid = geko.size() / 2;
	for (int i = mid; i < geko.size()-1; ++i) {
		if (newer[i] == newer[i + 1]) {
			itr[0] = i;
			ans[0] = newer[i];
			break;
		}
	}
	for (int i = mid; i >= 1; --i) {
		if (newer[i] == newer[i - 1]) {
			itr[1] = i;
			ans[1] = newer[i];
			break;
		}
	}
	if (abs((int)geko.size()/2 - itr[0]) > abs((int)geko.size()/2 - itr[1])) {
		return ans[1];
	}
	else {
		return ans[0];
	}
}
int main() {
	int n;
	cin >> n;
	REP(i, 2 * n - 1) {
		int a;
		cin >> a;
		geko.push_back(a);
	}
	int bot = 1;
	int top = 2 * n;
	while (top - bot > 1) {
		int mid = (top + bot) / 2;
		if (solve(mid) == 1) {
			bot = mid;
		}
		else {
			top = mid;
		}
	}
	cout << bot << endl;
}


Compiler output:
a.cc: In function 'int solve(int)':
a.cc:52:24: error: narrowing conversion of '1.0e+9' from 'double' to 'int' [-Wnarrowing]
   52 |         int itr[2] = { 1e9,1e9};
      |                        ^~~
a.cc:52:28: error: narrowing conversion of '1.0e+9' from 'double' to 'int' [-Wnarrowing]
   52 |         int itr[2] = { 1e9,1e9};
      |                            ^~~
Language: C++

#include<bits\stdc++.h>
using namespace std;
int n,a[200001];
bool checx(int x)
{
    if((a[n-1]<=x&&a[n]<=x)||(a[n]<=x&&a[n+1]<=x))return 1;
    if((a[n-1]> x&&a[n]> x)||(a[n]> x&&a[n+1]> x))return 0;
    for(int i=1;i<n-1;i++){
        if((a[n+i]<=x&&a[n+i+1]<=x)||(a[n-i]<=x&&a[n-i-1]<=x))return 1;
        if((a[n+i]> x&&a[n+i+1]> x)||(a[n-i]> x&&a[n-i-1]> x))return 0;
    }
    return a[1]<=x;
}

int main(){
    cin>>n;
    for(int i=1;i<n<<1;i++)cin>>a[i];
    int l=1,r=(n<<1)-1;
    while(l<r)
	{
        int mid=(l+r)/2;
        if(checx(mid))r=mid;
        else l=mid+1;
    }
    cout<<l;
}


Compiler output:
a.cc: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 n;
vector<int>v; 
int main()
{
	cin>>n;
	for(int i=1;i<2*n;i++)
	{
		int a;
		cin>>a;
		v.push_back(a);
	}
	while(v.size()!=1)
	{
		vector<int>vv;
		for(int i=1;i<v.size()-1;i++)vv.push_back(v[i-1]+v[i]+v[i+1]-min(v[i-1],min(v[i],v[i+1]))-max(v[i-1],max(v[i],v[i+1])));
		v=vv;
	}
	cout<<v[0]<<endl;
	return 0;
}

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

#include<bits/stdc++.h>
using namespace std;
int n,ans=-1;
vector<int> v;
int middle(int a,int b,int c)
{
	if((a>=b&&a<=c)||(a>=c&&a<=b))
		return a;
	if((b>=a&&b<=c)||(b>=c&&b<=a))
		return b;
	if((c>=a&&c<=b)||(c>=b&&c<=a))
		return c;
}
void dfs(vector<int> a)
{
	if(a.size()==1)
	{
		ans=a[0];
		return;
	}
	vector<int> next;
	for(int i=0;i<a.size()-2;i++)
		next.push_back(middle(a[i],a[i+1],a[i+2]));
	dfs(next);
}
int main()
{
	cin>>n;
	for(int i=0;i<2*n-1;i++)
	{
		int x;
		cin>>x;
		v.push_back(x);
	}
	dfs(v);
	cout<<ans<<endl; 
	return 0;
}#include<bits/stdc++.h>
using namespace std;
int n,ans=-1;
vector<int> v;
int middle(int a,int b,int c)
{
	if((a>=b&&a<=c)||(a>=c&&a<=b))
		return a;
	if((b>=a&&b<=c)||(b>=c&&b<=a))
		return b;
	if((c>=a&&c<=b)||(c>=b&&c<=a))
		return c;
}
void dfs(vector<int> a)
{
	if(a.size()==1)
	{
		ans=a[0];
		return;
	}
	vector<int> next;
	for(int i=0;i<a.size()-2;i++)
		next.push_back(middle(a[i],a[i+1],a[i+2]));
	dfs(next);
}
int main()
{
	cin>>n;
	for(int i=0;i<2*n-1;i++)
	{
		int x;
		cin>>x;
		v.push_back(x);
	}
	dfs(v);
	cout<<ans<<endl; 
	return 0;
}

Compiler output:
a.cc:38:2: error: stray '#' in program
   38 | }#include<bits/stdc++.h>
      |  ^
a.cc:38:3: error: 'include' does not name a type
   38 | }#include<bits/stdc++.h>
      |   ^~~~~~~
a.cc:40:5: error: redefinition of 'int n'
   40 | int n,ans=-1;
      |     ^
a.cc:3:5: note: 'int n' previously declared here
    3 | int n,ans=-1;
      |     ^
a.cc:40:7: error: redefinition of 'int ans'
   40 | int n,ans=-1;
      |       ^~~
a.cc:3:7: note: 'int ans' previously defined here
    3 | int n,ans=-1;
      |       ^~~
a.cc:41:13: error: redefinition of 'std::vector<int> v'
   41 | vector<int> v;
      |             ^
a.cc:4:13: note: 'std::vector<int> v' previously declared here
    4 | vector<int> v;
      |             ^
a.cc:42:5: error: redefinition of 'int middle(int, int, int)'
   42 | int middle(int a,int b,int c)
      |     ^~~~~~
a.cc:5:5: note: 'int middle(int, int, int)' previously defined here
    5 | int middle(int a,int b,int c)
      |     ^~~~~~
a.cc:51:6: error: redefinition of 'void dfs(std::vector<int>)'
   51 | void dfs(vector<int> a)
      |      ^~~
a.cc:14:6: note: 'void dfs(std::vector<int>)' previously defined here
   14 | void dfs(vector<int> a)
      |      ^~~
a.cc:63:5: error: redefinition of 'int main()'
   63 | int main()
      |     ^~~~
a.cc:26:5: note: 'int main()' previously defined here
   26 | int main()
      |     ^~~~
a.cc: In function 'int middle(int, int, int)':
a.cc:13:1: warning: control reaches end of non-void function [-Wreturn-type]
   13 | }
      | ^
a.cc: In function 'int middle(int, int, int)':
a.cc:50:1: warning: control reaches end of non-void function [-Wreturn-type]
   50 | }
      | ^
Language: C++

//NOT A FSKY CODE
#include <algorithm>
#include <cstdio>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <queue>
#include <sstream>
#include <stack>
#include <time.h>
#include <vector>
#include <complex>
#include <map>
#include <set>
#include <iomanip>
#include <math.h>
#include <stdlib.h>
#include <list>
#include <utility>
#include <memory>
#include <cstring>
#include <fstream>
#include <numeric>
#include <assert.h>
#include <bitset>
#include <ios> 
#include <bits/stdc++.h>
using namespace std;
int n,m;
int a[200004],b[200004];
bool check(int x){
	for (int i=1;i<=m;i++){
		if (a[i]<x) b[i]=0;
		else b[i]=1;
	}
	int l,r;
	for (l=n-1;l>0 && b[l]^b[l+1];l--);
	for (r=n+1;r<=m && b[r]^b[r-1];r++);
	if (l==0 && r==m+1) return b[1];
	return r-n>n-l?b[l]:b[r];
}
int main(){
	cin>>n;
	m=n*2-1;
	for (int i=1;i<=m;i++) scanf ("%d",&a[i]);
	int l=-1,r=m+1;
	while (r>l+1){
		int mid=(l+r)/2;
		if (check(mid)) l=mid;
		else r=mid;
	}
	cout<<mid;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:55:15: error: 'mid' was not declared in this scope
   55 |         cout<<mid;
      |               ^~~
Language: C++

#include <algorithm>
#include <cstdio>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <queue>
#include <sstream>
#include <stack>
#include <time.h>
#include <vector>
#include <complex>
#include <map>
#include <set>
#include <iomanip>
#include <math.h>
#include <stdlib.h>
#include <list>
#include <utility>
#include <memory>
#include <cstring>
#include <fstream>
#include <numeric>
#include <assert.h>
#include <bitset>
#include <ios> 
#include <bits/stdc++.h>
using namespace std;
int n;
void qq(){
	long long sum=0;
	for (int i=0;i<n;i++){
		long long x;
		cin>>x;
		sum+=x;
	}
	cout<<sum/x
}
int main(){
	vector <long long> v,t;
	cin>>n;
	if (n>=4500){
		qq();
		return 0;
	}
	for(int i=0;i<n;i++){
		long long x;
		cin>>x;
		v.push_back(x);
	}
	n=n*2-1; 
	int tw=0;
	while (1){
		tw^=1;
		if (tw==0){
			v.clear();
			for (int i=0;i+2<t.size();i++)
				v.push_back((t[i]+t[i+1]+t[i+2])/3); 
		}else{
			t.clear();
			for (int i=0;i+2<v.size();i++)
				t.push_back((v[i]+v[i+1]+v[i+2])/3); 
		}
		if (t.size()==1 || v.size()==1) break;
	}
	if (t.size()==1) cout<<t[0];
	else cout<<v[0];
}


Compiler output:
a.cc: In function 'void qq()':
a.cc:39:19: error: 'x' was not declared in this scope
   39 |         cout<<sum/x
      |                   ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int arr[100010];
int main(0)
{
  int n;
  cin >> n;
  for(int i=0; i<n; i++)
  {
    cin >> arr[i];
  }
  sort(arr, arr+n);
  cout << arr[n-1] << endl;
  return 0;
}

Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main(0)
      |     ^~~~
a.cc:5:1: error: expected ',' or ';' before '{' token
    5 | {
      | ^
Language: C++

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

const int N = 200010;

int n, a[N << 1];

int sma (int i, int j, int k) {
    return a[i] <= k && a[j] <= k;
}

int big (int i, int j, int k) {
    return a[i] > k && a[j] > k;
} 

int check (int k) {
    for (int i = 0; i < n - 1; ++i) {//枚举距离判断
        if (big (n + i, n + i + 1, k) || big (n - i, n - i - 1, k)) return 0;
        if (sma (n + i, n + i + 1, k) || sma (n - i, n - i - 1, k)) return 1;
    }
    return small (1, 1, k);//没有重合的特判
}

int main(){
	cin >> n;
    for (int i = 1; i <= (n << 1) - 1; ++i) {
        cin >> a[i];
    }
    int l = 1, r = 2 * n - 1, ans;
    while (l < r) {//二分判断
        int mid = (l + r) >> 1;
        if (check (mid)) {
            r = mid;
        } else {
			l = mid + 1;
		}
	}
    cout << r;
    return 0; 
}


Compiler output:
a.cc: In function 'int check(int)':
a.cc:21:12: error: 'small' was not declared in this scope; did you mean 'sma'?
   21 |     return small (1, 1, k);//没有重合的特判
      |            ^~~~~
      |            sma
Language: C++

#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
const int N=2e5+2,inf=1e9;
int a[N],b[N];
int n,m,i,x,l,r,mid,c,zx,as;
inline void read(int &x)
{
	c=getchar();
	while ((c<48)||(c>57)) c=getchar();
	x=c^48;c=getchar();
	while ((c>=48)&&(c<=57))
	{
		x=x*10+(c^48);
		c=getchar();
	}
}
inline int ab(int x)
{
	if (x>=0) return x;
	return -x;
}
bool pd()
{
	for (i=1;i<=m;i++) b[i]=(a[i]>=mid);zx=inf;
	for (i=2;i<=m;i++) if (b[i]==b[i-1])
	{
		if ((i==n)||(i==n+1)) return b[i];
		x=min(ab(i-n),ab(n-(i-1)));
		if (x<zx)
		{
			zx=x;
			as=b[i];
		}
	if (zx!=inf) return as;
	return b[1];
}
int main()
{
	read(n);m=(n<<1)-1;
	for (i=1;i<=m;i++) read(a[i]);
	l=1;r=m;
	while (l<r)
	{
		mid=l+r+1>>1;
		if (pd()) l=mid; else r=mid-1;
	}
	printf("%d",l);
}

Compiler output:
a.cc: In function 'bool pd()':
a.cc:39:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   39 | int main()
      |         ^~
a.cc:39:9: note: remove parentheses to default-initialize a variable
   39 | int main()
      |         ^~
      |         --
a.cc:39:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:40:1: error: a function-definition is not allowed here before '{' token
   40 | {
      | ^
a.cc:50:2: error: expected '}' at end of input
   50 | }
      |  ^
a.cc:25:1: note: to match this '{'
   25 | {
      | ^
a.cc:50:2: warning: control reaches end of non-void function [-Wreturn-type]
   50 | }
      |  ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
int kt(vector<int> &vi)
{
    int n = vi.size();
    int mid = vi.size()/2;
    {
        int a1 = vi[mid], a2 = vi[mid-1], a3 = vi[mid+1];
        if(a1==a2||a2==a3)
            return a2;
    }
    int l = mid, r = mid;
    while(l>=0)
    {
        if(a[l]==(1-a[l-1]))
        l--;
        else
        break;
    }
    while(r<n)
    {
        if(a[r]==(1-a[r+1]))
        r++;
        else
        break;
    }
    int x = r-mid;
    int y = mid-l;
    if(x>y) return a[l];
    return a[r];
}
int main()
{
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0;i<n;i++)
    cin >> a[i];
    int l = 1;
    int r = n;
    int soll = -1;
    while(l<r)
    {
        int mid = (l+r)/2;
        vector<int> b;
        for(int i = 0;i<n;i++)
        b.push_back((a[i]>=mid));
        int sol = kt(b);
        if(sol==0)
            l = mid+1;
        if(sol==1)
        {
            r = mid - 1;
            soll = mid;
        }
    }
    cout << soll;
    return 0;
}


Compiler output:
a.cc: In function 'int kt(std::vector<int>&)':
a.cc:16:12: error: 'a' was not declared in this scope
   16 |         if(a[l]==(1-a[l-1]))
      |            ^
a.cc:23:12: error: 'a' was not declared in this scope
   23 |         if(a[r]==(1-a[r+1]))
      |            ^
a.cc:30:20: error: 'a' was not declared in this scope
   30 |     if(x>y) return a[l];
      |                    ^
a.cc:31:12: error: 'a' was not declared in this scope
   31 |     return a[r];
      |            ^
Language: C++

//============================================================================
// Name        : test.cpp
// Author      : aelgawah
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <set.h>
using namespace std;
#define GET_MEDIUM(x,y,z) ((x>y)?((x<z)?(x):((y>z)?y:z)):((x<z)?((y>z)?z:y):x))
int N=100000;
int main()
{

	int steps,blk[N],temp;
	cin>>steps;
	for(int i=0; i<(2*steps -1); i++)
	{
		cin>>blk[i];
	}
	for(int i=0; i<steps -1; i++)
	{
		for(int j=0; j<(((2*steps -1)-2)-(2*i)) ; j++)
		{
			temp=GET_MEDIUM(blk[j],blk[j+1],blk[j+2]);
			blk[j]=temp;
			/*cout <<blk[0] <<blk[1] <<blk[2] <<blk[3] <<blk[4] <<blk[5] <<blk[6] << endl;
			cout <<blk[j] << endl;*/
		}
	}
	cout <<blk[0] << endl; // prints !!!Hello World!!!
	return 0;
}


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

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

int n,a[200005];

inline bool check(const int &k){
    if((a[n-1]<=k&&a[n]<=k)||(a[n]<=k&&a[n+1]<=k))return 1;
    if((a[n-1]> k&&a[n]> k)||(a[n]> k&&a[n+1]> k))return 0;
    for(int i=1;i<n-1;i++){
        if((a[n+i]<=k&&a[n+i+1]<=k)||(a[n-i]<=k&&a[n-i-1]<=k))return 1;
        if((a[n+i]> k&&a[n+i+1]> k)||(a[n-i]> k&&a[n-i-1]> k))return 0;
    }
    return a[1]<=k;
}

int main(){
    scanf("%d",&n);
    for(int i=1;i<n<<1;i++)scanf("%d",a+i);
    int l=1,r=(n<<1)-1;
    while(l<r){
        int mid=l+r>>1;
        if(check(mid))r=mid;
        else l=mid+1;
    }
    printf("%d",l);

Compiler output:
a.cc: In function 'int main()':
a.cc:26:20: error: expected '}' at end of input
   26 |     printf("%d",l);
      |                    ^
a.cc:17:11: note: to match this '{'
   17 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a[2000005];
inline bool check(int k)
{
    if((a[n-1]<=k&&a[n]<=k)||(a[n]<=k&&a[n+1]<=k))
		return true;
    if((a[n-1]>k&&a[n]>k)||(a[n]>k&&a[n+1]>k))
		return false;
    for(int i=1;i<n-1;i++)
	{
        if((a[n+i]<=k&&a[n+i+1]<=k)||(a[n-i]<=k&&a[n-i-1]<=k))
			return true;
        if((a[n+i]>k&&a[n+i+1]>k)||(a[n-i]>k&&a[n-i-1]>k))
			return false;
    }
    if(a[1]<=k);
    	return true;
    else
    	return false;
}
int main()
{
    freopen
	scanf("%d",&n);
    for(int i=1;i<n*2;i++)
		scanf("%d",&a[i]);
    int l=1,r=n*2-1;
    while(l<r)
	{
        int mid=(l+r)/2;
        if(check(mid))
			r=mid;
        else 
			l=mid+1;
    }
    printf("%d",l);
}

Compiler output:
a.cc: In function 'bool check(int)':
a.cc:19:5: error: 'else' without a previous 'if'
   19 |     else
      |     ^~~~
a.cc: In function 'int main()':
a.cc:24:12: error: expected ';' before 'scanf'
   24 |     freopen
      |            ^
      |            ;
   25 |         scanf("%d",&n);
      |         ~~~~~
Language: C++

#include <iostream>
#include <ctime>
#include <algorithm>
#include <cstdlib>
#include <cstdio>
#include <cstring>
using namespace std;
const int MAXN = 200005;
int a[MAXN],t[MAXN],n;
inline bool check(int limit)
{
	for(int i=1;i<=n*2-1;++i)
		t[i]=(a[i]>=limit);
	int l=-1,r=-1,lpos=-0x3f3f3f3f,rpos=0x3f3f3f3f;
	for(int i=n+1;i<=n*2-1;++i)
		if(t[i]==t[i-1]){r=t[i],rpos=i-1;break;}
	for(int i=n-1;i>0;--i)
		if(t[i]==t[i+1]){l=t[i],lpos=i+1;break;}
	if(l==-1 && r==-1)
		if(mid&1)return t[mid];
		else return t[mid]^1;
	else return (rpos-mid>mid-lpos?l:r);
	return 0;
}
int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n*2-1;++i)
		scanf("%d",a+i);
	int l=1,r=n*2-1,mid,ans=0;
	while(l<=r){
		mid=(l+r)>>1;
		if(check(mid))l=mid+1,ans=mid;
		else r=mid-1;
	}
	cout<<ans<<endl;
	return 0;
}


Compiler output:
a.cc: In function 'bool check(int)':
a.cc:20:20: error: 'mid' was not declared in this scope
   20 |                 if(mid&1)return t[mid];
      |                    ^~~
a.cc:22:27: error: 'mid' was not declared in this scope
   22 |         else return (rpos-mid>mid-lpos?l:r);
      |                           ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
scanf("%d",&n);
printf("%d\n",n);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:13: error: 'n' was not declared in this scope; did you mean 'yn'?
    4 | scanf("%d",&n);
      |             ^
      |             yn
Language: C++

#include<cstdio>
#include<algorithm>
using namespace std;
int n,a[200010],ans;
bool p[200010];
bool check(int mid){
	for(int i=1;i<=n*2-1;i++)
		p[i]=(a[i]<=mid);
	for(int i=0;i<n-1;i++){
		if(p[n-i]==p[n-i-1])
			return p[n-i];
		if(p[n+i]==p[n+i+1])
			return p[n+i+1];
	}
	return p[1];
}
int rd(){
	int x=0;
	char c;
	do c=getchar();
	while(!isdigit(c));
	do{
		x=(x<<1)+(x<<3)+(c^48);
		c=getchar();
	}while(isdigit(c));
	return x;
}
int main(){
	n=rd();
	for(int i=1;i<=n*2-1;i++)
		scanf("%d",a+i);
	int l=2,r=n*2-2;
	while(l<=r){
		int mid=(l+r)>>1;
		if(check(mid)){
			ans=mid;
			r=mid-1;
		}
		else l=mid+1;
	}
	printf("%d",ans);
	return 0;
}

Compiler output:
a.cc: In function 'int rd()':
a.cc:21:16: error: 'isdigit' was not declared in this scope
   21 |         while(!isdigit(c));
      |                ^~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a[20000010];
bool x(int i,int j,int k) {
    return a[i]<=k&&a[j]<=k;
}
bool y(int i,int j,int k){
    return a[i]>k&&a[j]>k;
} 
bool check(int a){
    for(int i=0;i<n-1;i++){
        if(y(n+i,n+i+1,a)||y(n-i,n-i-1,a)) return 0;
        if(x(n+i,n+i+1,a)||x(n-i,n-i-1,a)) return 1;
    }
    return x(1,1,k);
}
int main(){
    scanf("%d",&n);
    for(int i=1;i<=2*n-1;i++) scanf("%d",&a[i]);
    int l=1,r=2*n-1,mid;
    while(l<r){
	 	mid=(l+r)/2;
        if(check(mid)) r=mid;
        else l=mid+1;
    }
    printf("%d",l);
    return 0; 
}

Compiler output:
a.cc: In function 'bool check(int)':
a.cc:15:18: error: 'k' was not declared in this scope
   15 |     return x(1,1,k);
      |                  ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a[20000010];
bool x(int i,int j,int k) {
    return a[i]<=k&&a[j]<=k;
}
bool y(int i,int j,int k){
    return a[i]>k&&a[j]>k;
} 
bool check(int a){
    for(int i=0;i<n-1;i++){
        if(y(n+i,n+i+1,a)||y(n-i,n-i-1,a)) return 0;
        if(x(n+i,n+i+1,a)||x(n-i,n-i-1,a)) return 1;
    }
    return a(1,1,k);
}
int main(){
    scanf("%d",&n);
    for(int i=1;i<=2*n-1;i++) scanf("%d",&a[i]);
    int l=1,r=2*n-1,mid;
    while(l<r){
	 	mid=(l+r)/2;
        if(check(mid)) r=mid;
        else l=mid+1;
    }
    printf("%d",l);
    return 0; 
}

Compiler output:
a.cc: In function 'bool check(int)':
a.cc:15:18: error: 'k' was not declared in this scope
   15 |     return a(1,1,k);
      |                  ^
a.cc:15:19: error: 'a' cannot be used as a function
   15 |     return a(1,1,k);
      |                   ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a[20000010];
bool x(int i,int j,int k) {
    return a[i]<=k&&a[j]<=k;
}
bool y(int i,int j,int k){
    return a[i]>k&&a[j]>k;
} 
bool check(int a){
    for(int i=0;i<n-1;i++){
        if(y(n+i,n+i+1,a)||y(n-i,n-i-1,a)) return 0;
        if(x(n+i,n+i+1,a)||x(n-i,n-i-1,a)) return 1;
    }
    return smaller(1,1,k);
}
int main(){
    scanf("%d",&n);
    for(int i=1;i<=2*n-1;i++) scanf("%d",&a[i]);
    int l=1,r=2*n-1,mid;
    while(l<r){
	 	mid=(l+r)/2;
        if(check(mid)) r=mid;
        else l=mid+1;
    }
    printf("%d",l);
    return 0; 
}

Compiler output:
a.cc: In function 'bool check(int)':
a.cc:15:24: error: 'k' was not declared in this scope
   15 |     return smaller(1,1,k);
      |                        ^
a.cc:15:12: error: 'smaller' was not declared in this scope
   15 |     return smaller(1,1,k);
      |            ^~~~~~~
Language: C++

#include<bits/stdc++.h>
const int maxn=200005;
int n,a[maxn],b[maxn];
inline bool check(int k){
	for(int i=1;i<=2*n-1;i++) b[i]=(a[i]>=k);
	int l=n,r=n;
	while(l>1&&b[l-1]!=b[l]) l--;
	while(r<2*n-1&&b[r+1]!=b[r]) r++;
	if(l==1&&r==2*n-1) return (n&1)?b[n]:(b[n]^1);
	return n-l<r-n?b[l]:b[r];
}
int main(){
	sacnf("%d",&d);
	fo(int i=1;i<=2*n-1;i++) scanf("%d",&a[i]);
	int l=1,r=2*n-1,ans;
	while(l<=r){
		int md=(l+r)>>1;
		if(check(md)){
			ans=md;
			l=md+1;
		}
		else r=md-1;
	}
	printf("%d\n",ans);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:21: error: 'd' was not declared in this scope
   13 |         sacnf("%d",&d);
      |                     ^
a.cc:13:9: error: 'sacnf' was not declared in this scope; did you mean 'scanf'?
   13 |         sacnf("%d",&d);
      |         ^~~~~
      |         scanf
a.cc:14:12: error: expected primary-expression before 'int'
   14 |         fo(int i=1;i<=2*n-1;i++) scanf("%d",&a[i]);
      |            ^~~
a.cc:14:20: error: 'i' was not declared in this scope
   14 |         fo(int i=1;i<=2*n-1;i++) scanf("%d",&a[i]);
      |                    ^
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <algorithm>
using namespace std;

#define Rep(i,l,r) for (int i = (l); i <= (r); ++ i)
#define RepD(i,r,l) for (int i = (r); i >= (l); -- i)
#define RepG(i,x) for (int i = hd[x]; i; i = e[i].nxt)

int main () {
        cin >> n; cout << n << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:16: error: 'n' was not declared in this scope; did you mean 'yn'?
   15 |         cin >> n; cout << n << endl;
      |                ^
      |                yn
Language: C++

# include <cstdio>

# define REP(i, n) for (int i = 1; i <= n; ++ i)
# define REP_0(i, n) for (int i = 0; i < n; ++ i)
# define FOR(i, a, b) for (int i = a; i <= b; ++ i)
# define NR 201000

bool a[NR];
int w[NR], n, m;

bool calc_top () {
	int p = 0;

	//REP (i, n) printf ("%d ", a[i]); puts (" Beg");
	
	FOR (i, 2, n) {
		if (a[i] == a[i - 1]) {
			int l = p + 1, r = i - 2;
			if (l <= r) {
				int len = r - l + 1;
				if (len % 2 == 0) {
					REP_0 (j, len) {
						if (j < len / 2) a[l + j] = a[l - 1];
						else a[l + j] = a[r + 1];
					}
				} else FOR (j, l, r) a[j] = a[r + 1];
			}
			p = i;
		}
	}
	
	int l = p + 1, r = len;
	if (len % 2 == 0) {
		REP_0 (j, len) {
			if (j < len / 2) a[l + j] = a[l - 1];
			else a[l + j] = a[r + 1];
		}
	} else FOR (j, l, r) a[j] = a[l - 1];
	
	//REP (i, n) printf ("%d ", a[i]); puts (" End");

	return p == 0 ? a[1] : a[m];
}

int main () {
	scanf ("%d", &m);
	n = 2 * m - 1;
	REP (i, n) {
		scanf ("%d", &w[i]);
	}

	int l = 1, r = n;

	for (; l < r; ) {
		int mid = (l + r + 1) / 2;
		REP (i, n) a[i] = (w[i] >= mid);
		//printf ("!%d\n", mid);
		if (calc_top ()) l = mid;
		else r = mid - 1;
	}

	printf ("%d\n", l);
	return 0;
}


Compiler output:
a.cc: In function 'bool calc_top()':
a.cc:32:28: error: 'len' was not declared in this scope
   32 |         int l = p + 1, r = len;
      |                            ^~~
Language: C++

# include <cstdio>

# define REP(i, n) for (int i = 1; i <= n; ++ i)
# define REP_0(i, n) for (int i = 0; i < n; ++ i)
# define FOR(i, a, b) for (int i = a; i <= b; ++ i)
# define NR 201000

bool a[NR];
int w[NR], n, m;

bool calc_top () {
	int p = 0;

	FOR (i, 2, n) {
		if (s[i] == s[i - 1]) {
			int l = p + 1, r = i - 2;
			if (l <= r) {
				int len = r - l + 1;
				if (len % 2 == 0) {
					REP_0 (j, len) {
						if (j < len / 2) a[l + j] = a[l - 1];
						else a[l + j] = a[r + 1];
					}
				} else FOR (j, l, r) a[j] = a[r + 1];
			}
		}
	}

	return p == 0 ? a[1] : a[m];
}

int main () {
	scanf ("%d", &m);
	n = 2 * m - 1;
	REP (i, n) {
		scanf ("%d", &w[i]);
	}

	int l = 1, r = n;

	for (; l < r; ) {
		int mid = (l + r) / 2;
		REP (i, n) a[i] = (w[i] >= mid);
	}

	printf ("%d\n", l);
	return 0;
}


Compiler output:
a.cc: In function 'bool calc_top()':
a.cc:15:21: error: 's' was not declared in this scope
   15 |                 if (s[i] == s[i - 1]) {
      |                     ^