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

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, S, min, tmp;
  cin >> N;
  vector<int> A(N);
  for(int i=0;i<N;i++){
    cin >> A.at(i);
  }
  
  vector<int> B(N-1);
  for(int i=0;i<N-1;i++){
    B.at(i) = A.at(i) + A.at(i+1);
    if(i==0){
      min = B.at(0);
    }
    else if(B.at(i)<min){
      min = B.at(i);      
    }
  
  S = 0;
  
  for(int i=0;i<N;i++){
    S += A.at(i);
  }
  
  S += min*(-2);
  
  cout << S <<endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:30:2: error: expected '}' at end of input
   30 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
int main(void){
	int n,i,neganum,min,j;
  	long result;
  	int m[n];
  	neganum = 0;
  	result = 0;
  	for (i=0;i<n;i++){
    	cin >> m[i];
      	if (m[i]<=0){
        	neganum += 1;
        }
    }
  	if (neganum%2 == 0){
    	for (i=0;i<n;i++){
        	result += abs(m[i]);
        }
    printf("%d",result);
    return 0;
    }else{
      	min = 100000;
    	for (i=0;i<n;i++){
          	if (abs(m[i])<=min){
            	min = abs(m[i]);
                j = i;
              	m[i] = abs(m[i]);
            }
        }
    	for (i=0;i<n;i++){
          	if (i == j){
            	result -= m[i];
            }else{
            	result += m[i];
            }
        }
    printf("%d",result);
    return 0;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 |         cin >> m[i];
      |         ^~~
      |         std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
Language: C

#include <stdio.h>

int main() {
	int n, i, x, m, m1, m2, a[100000];
	scanf("%d", &n);
	m = 0;
	m1 = 0;
	x = 0;
	for (i = 0; i < n; i++) scanf_s("%d", &a[i]);
	for (i = 0; i < n; i++) {
		if (a[i] < 0) {
			x++; 
			if(m1 == 0)m1=i;
			else m2 =i;
			}
		}
	if (x % 2 == 0) for (i = 0; i < n; i++) {
		if (a[i] > 0) m+=a[i];
		else m -= a[i];
	}
	else {
		if (m1 > 0 && a[0] < -a[m1]) a[m1] = -a[0];
		if (m2 < n-1 && a[n-1] < -a[m2]) a[m2] = -a[n-1];
		for (i = 0; i < n; i++) {
			if (a[i] > 0) m += a[i];
			else m -= a[i];
		}
		if (a[m1] > a[m2]) m += a[m1] * 2;
		else m += a[m2] * 2;
	}
	printf("%d", m);
}

Compiler output:
main.c: In function 'main':
main.c:9:33: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    9 |         for (i = 0; i < n; i++) scanf_s("%d", &a[i]);
      |                                 ^~~~~~~
      |                                 scanf
Language: C++

#include<bits/stdc++.h>

using namespace std;
using ll = long long;

#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define debug(x) cout << #x << ": " << x << endl;

int main() {
    int N;
    cin >> N;
    vector<ll> A(N), cum(N + 1, 0LL), positivecum(N + 1, 0LL);
    bool flg = false;
    for (int i = 0; i < N; ++i) {
        cin >> A[i];
        if (A[i] == 0)flg = true;
        cum[i + 1] = cum[i] + A[i];
        positivecum[i + 1] = positivecum[i] + abs(A[i]);
    }

    ll ans = accumulate(A.begin(), A.end(), 0LL);
    if (flg) {
        cout << positive[N] << endl;
        return 0;
    }

    for (int i = 0; i < N - 1; ++i) {
        ll sum = positivecum[i];

        if (A[i] < 0) {
            A[i] *= -1LL;
            A[i + 1] *= -1LL;
        }
        sum += A[i] + A[i + 1] + (cum[N] - cum[i + 2]);
        //debug(sum);
        ans = max(ans, sum);
    }


    cout << ans << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:17: error: 'positive' was not declared in this scope; did you mean 'positivecum'?
   24 |         cout << positive[N] << endl;
      |                 ^~~~~~~~
      |                 positivecum
Language: C++

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

int array_sum_from_i(vector<int> &data, int i) {
  // ベースケース
  if (i == data.size()) {
    return 0;  // 対象の要素がないので総和は0
  }
  // 再帰ステップ
  int s = array_sum_from_i(data, i + 1);  // i+1番目以降の要素の総和
  return data.at(i) + s;  // 「i番目以降の要素の総和」=「i番目の要素」+ s
}

// dataの全ての要素の総和を計算する
int array_sum(vector<int> &data) {
  return array_sum_from_i(data, 0);
}

int almin_i(vector<int>A,int i) {
  if(i+1 == A.size()) {
    return A.at(i);
  }
  int s = almin_i(A, i+1) 
    return min(s, A.at(i));
}

int almin(vector<int>A) {
  return almin_i(A,0);
}
 
int main() {
  int N;
  int M = 0;
  cin >> N;
  vector<int>A(N);
  for (int i = 0; i < N; i++) {
    cin >> A.at(i);
    if (A.at(i) < 0) {
      M++;
      A.at(i) *= -1;
    }
  }

  if (M % 2 == 0) {
    cout << array_sum(A) << endl;
  }
  else {
    cout << array_sum(A) - almin(A) * 2 << endl;
  }
  return 0;
}


Compiler output:
a.cc: In function 'int almin_i(std::vector<int>, int)':
a.cc:24:5: error: expected ',' or ';' before 'return'
   24 |     return min(s, A.at(i));
      |     ^~~~~~
a.cc:23:18: warning: control reaches end of non-void function [-Wreturn-type]
   23 |   int s = almin_i(A, i+1)
      |           ~~~~~~~^~~~~~~~
Language: C++

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

int array_sum_from_i(vector<int> &data, int i) {
  // ベースケース
  if (i == data.size()) {
    return 0;  // 対象の要素がないので総和は0
  }
  // 再帰ステップ
  int s = array_sum_from_i(data, i + 1);  // i+1番目以降の要素の総和
  return data.at(i) + s;  // 「i番目以降の要素の総和」=「i番目の要素」+ s
}

// dataの全ての要素の総和を計算する
int array_sum(vector<int> &data) {
  return array_sum_from_i(data, 0);
}

int almin_i(vector<int>A,int i) {
  if(i+1 == A.size()) {
    return A.at(i);
  }
  int s = almin_i(A, i+1) {
    return min(s, A.at(i));

int almin(vector<int>A) {
  return almin_i(A,0);
}
 
int main() {
  int N;
  int M = 0;
  cin >> N;
  vector<int>A(N);
  for (int i = 0; i < N; i++) {
    cin >> A.at(i);
    if (A.at(i) < 0) {
      M++;
      A.at(i) *= -1;
    }
  }

  if (M % 2 == 0) {
    cout << array_sum(A) << endl;
  }
  else {
    cout << array_sum(A) - almin(A) * 2 << endl;
  }
  return 0;
}


Compiler output:
a.cc: In function 'int almin_i(std::vector<int>, int)':
a.cc:23:27: error: expected ',' or ';' before '{' token
   23 |   int s = almin_i(A, i+1) {
      |                           ^
a.cc:50:2: error: expected '}' at end of input
   50 | }
      |  ^
a.cc:19:33: note: to match this '{'
   19 | int almin_i(vector<int>A,int i) {
      |                                 ^
a.cc:23:18: warning: control reaches end of non-void function [-Wreturn-type]
   23 |   int s = almin_i(A, i+1) {
      |           ~~~~~~~^~~~~~~~
Language: C++

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

int array_sum_from_i(vector<int> &data, int i) {
  // ベースケース
  if (i == data.size()) {
    return 0;  // 対象の要素がないので総和は0
  }
  // 再帰ステップ
  int s = array_sum_from_i(data, i + 1);  // i+1番目以降の要素の総和
  return data.at(i) + s;  // 「i番目以降の要素の総和」=「i番目の要素」+ s
}

// dataの全ての要素の総和を計算する
int array_sum(vector<int> &data) {
  return array_sum_from_i(data, 0);
}

int almin_i(vector<int>A,int i) {
  if(i+1 == A.size()) {
    return A.at(i);
  }
  int s = almin_i(A, i+1) {
    return min(s, A.at(i))

int almin(vector<int>A) {
  return almin_i(A,0);
}
 
int main() {
  int N;
  int M = 0;
  cin >> N;
  vector<int>A(N);
  for (int i = 0; i < N; i++) {
    cin >> A.at(i);
    if (A.at(i) < 0) {
      M++;
      A.at(i) *= -1;
    }
  }

  if (M % 2 == 0) {
    cout << array_sum(A) << endl;
  }
  else {
    cout << array_sum(A) - almin(A) * 2 << endl;
  }
  return o;
}

Compiler output:
a.cc: In function 'int almin_i(std::vector<int>, int)':
a.cc:23:27: error: expected ',' or ';' before '{' token
   23 |   int s = almin_i(A, i+1) {
      |                           ^
a.cc:50:2: error: expected '}' at end of input
   50 | }
      |  ^
a.cc:19:33: note: to match this '{'
   19 | int almin_i(vector<int>A,int i) {
      |                                 ^
a.cc:23:18: warning: control reaches end of non-void function [-Wreturn-type]
   23 |   int s = almin_i(A, i+1) {
      |           ~~~~~~~^~~~~~~~
Language: C++

#include <bits/stdc++.h>

using namepsace std;

typedef long long ll;

ll arr[100010];

int main() {
	int n;
  	ll sum=0;
  	for (int i=0;i<n;i++){
      cin>>arr[i];
      sum+=abs(arr[i]);
    }
  	sort(arr,arr+n);
  sum-=(2*arr[0]);
  cout<<sum<<endl;
}


Compiler output:
a.cc:3:7: error: expected nested-name-specifier before 'namepsace'
    3 | using namepsace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:13:7: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   13 |       cin>>arr[i];
      |       ^~~
      |       std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 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:16:9: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   16 |         sort(arr,arr+n);
      |         ^~~~
      |         std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:18:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |   cout<<sum<<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:18:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   18 |   cout<<sum<<endl;
      |              ^~~~
      |              std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/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>

typedef long long ll;

ll arr[100010];

int main() {
	int n;
  	ll sum=0;
  	for (int i=0;i<n;i++){
      cin>>arr[i];
      sum+=abs(arr[i]);
    }
  	sort(arr,arr+n);
  sum-=(2*arr[0]);
  cout<<sum<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:7: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   11 |       cin>>arr[i];
      |       ^~~
      |       std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 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:14:9: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   14 |         sort(arr,arr+n);
      |         ^~~~
      |         std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:16:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |   cout<<sum<<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:16:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   16 |   cout<<sum<<endl;
      |              ^~~~
      |              std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/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>

ll arr[100010];

int main() {
	int n;
  	ll sum=0;
  	for (int i=0;i<n;i++){
      cin>>arr[i];
      sum+=abs(arr[i]);
    }
  	sort(arr,arr+n);
  sum-=(2*arr[0]);
  cout<<sum<<endl;
}

Compiler output:
a.cc:3:1: error: 'll' does not name a type
    3 | ll arr[100010];
      | ^~
a.cc: In function 'int main()':
a.cc:7:9: error: 'll' was not declared in this scope
    7 |         ll sum=0;
      |         ^~
a.cc:9:7: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 |       cin>>arr[i];
      |       ^~~
      |       std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:12: error: 'arr' was not declared in this scope
    9 |       cin>>arr[i];
      |            ^~~
a.cc:10:7: error: 'sum' was not declared in this scope
   10 |       sum+=abs(arr[i]);
      |       ^~~
a.cc:12:14: error: 'arr' was not declared in this scope
   12 |         sort(arr,arr+n);
      |              ^~~
a.cc:12:9: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   12 |         sort(arr,arr+n);
      |         ^~~~
      |         std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:13:3: error: 'sum' was not declared in this scope
   13 |   sum-=(2*arr[0]);
      |   ^~~
a.cc:14:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 |   cout<<sum<<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:14:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   14 |   cout<<sum<<endl;
      |              ^~~~
      |              std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/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;

int main() {
	int N;
	cin >> N;
	vector<int> vec(N);
	for (int i = 0; i < N; i++) {
		cin >> vec.at(i);
	}
	int A = 0;
	for (int i = 0; i < N; i++) {
		if (vec.at(i) == 0) {
			A++;
			break;
		}
	}
	int B = 0;
	for (int i = 0; i < N; i++) {
		if (vec.at(i) < 0) {
			B++;
		}
	}
	if (A == 0 && B % 2 == 1) {
		int mini = 0;
		for (int i = 0; i < N; i++) {
			if (vec.at(i) < 0) {
				vec.at(i) = -vec.at(i);
			}
			mini = min(mini, vec.at(i));
		}
		int sum = 0;
		for (int i = 0; i < N; i++) {
			sum += vec.at(i);
			coout << sum - 2 * mini << endl;
	}
	else {
		int sum = 0;
		for (int i = 0; i < N; i++) {
			if (vec.at(i) >= 0) {
				sum += vec.at(i);
			}
			else {
				sum -= vec.at(i);
			}
		}
		cout << sum << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:35:25: error: 'coout' was not declared in this scope
   35 |                         coout << sum - 2 * mini << endl;
      |                         ^~~~~
a.cc:37:9: error: expected '}' before 'else'
   37 |         else {
      |         ^~~~
a.cc:24:35: note: to match this '{'
   24 |         if (A == 0 && B % 2 == 1) {
      |                                   ^
Language: C++

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

int main() {
	int N;
	cin >> N;
	vector<int> vec(N);
	for (int i = 0; i < N; i++) {
		cin >> vec.at(i);
	}
	int A = 0;
	for (int i = 0; i < N; i++) {
		if (vec.at(i) == 0) {
			A++;
			break;
		}
	}
	int B = 0;
	for (int i = 0; i < N; i++) {
		if (vec.at(i) < 0) {
			B++;
		}
	}
	if (A = 0 && B % 2 = 1) {
		int mini = 0;
		for (int i = 0; i < N; i++) {
			if (vec.at(i) < 0) {
				vec(i) = -vec(i);
			}
			mini = min(mini, vec(i));
		}
		int sum = 0;
		for (int i = 0; i < N; i++) {
			sum += vec(i);
			coout << sum - 2 * mini << endl;
	}
	else {
		int sum = 0;
		for (int i = 0; i < N; i++) {
			if (vec.at(i) >= 0) {
				sum += vec(i);
			}
			else {
				sum -= vec(i);
			}
		}
		cout << sum << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:19: error: lvalue required as left operand of assignment
   24 |         if (A = 0 && B % 2 = 1) {
      |                 ~~^~~~~~~~
a.cc:28:36: error: no match for call to '(std::vector<int>) (int&)'
   28 |                                 vec(i) = -vec(i);
      |                                 ~~~^~~
a.cc:28:46: error: no match for call to '(std::vector<int>) (int&)'
   28 |                                 vec(i) = -vec(i);
      |                                           ~~~^~~
a.cc:30:45: error: no match for call to '(std::vector<int>) (int&)'
   30 |                         mini = min(mini, vec(i));
      |                                          ~~~^~~
a.cc:34:35: error: no match for call to '(std::vector<int>) (int&)'
   34 |                         sum += vec(i);
      |                                ~~~^~~
a.cc:35:25: error: 'coout' was not declared in this scope
   35 |                         coout << sum - 2 * mini << endl;
      |                         ^~~~~
a.cc:37:9: error: expected '}' before 'else'
   37 |         else {
      |         ^~~~
a.cc:24:33: note: to match this '{'
   24 |         if (A = 0 && B % 2 = 1) {
      |                                 ^
a.cc:41:43: error: no match for call to '(std::vector<int>) (int&)'
   41 |                                 sum += vec(i);
      |                                        ~~~^~~
a.cc:44:43: error: no match for call to '(std::vector<int>) (int&)'
   44 |                                 sum -= vec(i);
      |                                        ~~~^~~
Language: C++

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

int main(){
  long int A;
  int N;
  long int x;//xはマイナスの数
  long int min = 1000000000;
  long int sum = 0;
  cin >> N;
  for(int i = 0; i < N; i++){
    cin >> A;
    if(A < 0){
      A = -A;
      x++;
    }
    if(min > A){
      min = A;
    }
    sum += A;
  }
  if(x%2 = 1){
    sum -= 2*min;
  }
  cout << sum << endl;
}
      

Compiler output:
a.cc: In function 'int main()':
a.cc:22:7: error: lvalue required as left operand of assignment
   22 |   if(x%2 = 1){
      |      ~^~
Language: C++

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

int main()
{
	int N, i, judg = 0;
	double A[100005], Ans = 0.0, sub = 1000000000.0;
	cin >> N;
	for (i = 0; i < N; i++)
		cin >> A[i];

	for (i = 0; i < N; i++) {
		if (A[i] <= 0)
			judg += 1;
		Ans += fabs(A[i]);
		if (sub > fabs(A[i]))
			sub = fabs(A[i]);
	}

	if (judg % 2 == 1)
		Ans -= sub * 2.0;

	cout << Ans;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:24: error: 'fabs' was not declared in this scope; did you mean 'labs'?
   16 |                 Ans += fabs(A[i]);
      |                        ^~~~
      |                        labs
Language: C++

#include "pch.h"
#include <iostream>
#include <string>
using namespace std;

int main()
{
	int N, i, judg = 0;
	double A[100005], Ans = 0.0, sub = 1000000000.0;
	cin >> N;
	for (i = 0; i < N; i++)
		cin >> A[i];

	for (i = 0; i < N; i++) {
		if (A[i] <= 0)
			judg += 1;
		Ans += fabs(A[i]);
		if (sub > fabs(A[i]))
			sub = fabs(A[i]);
	}

	if (judg % 2 == 1)
		Ans -= sub * 2.0;

	cout << Ans;
	return 0;
}

Compiler output:
a.cc:1:10: fatal error: pch.h: No such file or directory
    1 | #include "pch.h"
      |          ^~~~~~~
compilation terminated.
Language: C++

#!/usr/bin/env ruby

n = gets.chomp.to_i
a = gets.chomp.split(' ').map(&:to_i)

count_mainasu = a.count {|aa| aa < 0}
min = 0
sum_all = a.map {|aa| aa < 0 ? -1 * aa : aa }.tap{|ary| min = ary.min}.map(&:to_i).inject(:+)
ans = count_mainasu%2 == 0 ? sum_all : ( sum_all - 2 * min )

puts ans

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #!
    1 | #!/usr/bin/env ruby
      |  ^
a.cc:3:1: error: 'n' does not name a type
    3 | n = gets.chomp.to_i
      | ^
a.cc:7:1: error: 'min' does not name a type
    7 | min = 0
      | ^~~
a.cc:8:46: error: expected unqualified-id before '.' token
    8 | sum_all = a.map {|aa| aa < 0 ? -1 * aa : aa }.tap{|ary| min = ary.min}.map(&:to_i).inject(:+)
      |                                              ^
a.cc:8:71: error: expected unqualified-id before '.' token
    8 | sum_all = a.map {|aa| aa < 0 ? -1 * aa : aa }.tap{|ary| min = ary.min}.map(&:to_i).inject(:+)
      |                                                                       ^
Language: C++

int main(){
    long long n, sum = 0, by = 1, abs_min = 1e9;
    std::cin >> n;
    std::vector<long long> a(n);
    for(int i = 0; i < n; i++){
        std::cin >> a.at(i);
        sum += abs(a.at(i));
        abs_min = std::min(abs_min, static_cast<long long>(abs(a.at(i))));
        by *= a.at(i);
    }
    if(by < 0) std::cout << sum - abs_min * 2;
    else std::cout << sum;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:3:10: error: 'cin' is not a member of 'std'
    3 |     std::cin >> n;
      |          ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | int main(){
a.cc:4:10: error: 'vector' is not a member of 'std'
    4 |     std::vector<long long> a(n);
      |          ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | int main(){
a.cc:4:17: error: expected primary-expression before 'long'
    4 |     std::vector<long long> a(n);
      |                 ^~~~
a.cc:6:14: error: 'cin' is not a member of 'std'
    6 |         std::cin >> a.at(i);
      |              ^~~
a.cc:6:14: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:6:21: error: 'a' was not declared in this scope
    6 |         std::cin >> a.at(i);
      |                     ^
a.cc:7:16: error: 'abs' was not declared in this scope
    7 |         sum += abs(a.at(i));
      |                ^~~
a.cc:8:24: error: 'min' is not a member of 'std'
    8 |         abs_min = std::min(abs_min, static_cast<long long>(abs(a.at(i))));
      |                        ^~~
a.cc:11:21: error: 'cout' is not a member of 'std'
   11 |     if(by < 0) std::cout << sum - abs_min * 2;
      |                     ^~~~
a.cc:11:21: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:12:15: error: 'cout' is not a member of 'std'
   12 |     else std::cout << sum;
      |               ^~~~
a.cc:12:15: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

n=int(input()) 
a=list(map(int,input().split())) 
count=0 
saidaiti=0 
while True: 
    saidaiti=saidaiti+abs(a[count]) 
    count=count+1 
    if count==n: 
        break 
if n%2==1:
    saidaiti=saidaiti-2*min(a)
print(saidaiti)


Compiler output:
a.cc:1:1: error: 'n' does not name a type
    1 | n=int(input())
      | ^
Language: C++

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

int main(int argc, const char * argv[]) {
    int N;
    int minus_count = 0;
    long result = 0;
    
    cin >> N;
    
    vector<long> A(N);
    for (int i = 0; i < N; i++) {
        cin >> A[i];
        if (A[i] < 0) {
            minus_count++;
        }
    }
    
    if ((minus_count % 2) == 0) {
        for (int i = 0; i < A.size(); i++) {
            A[i] = abs(A[i]);
        }
    } else {
        for (int i = 0; i < A.size(); i++) {
            A[i] = abs(A[i]);
        }
        sort(A.begin(), A.end());
        A[0] = -A[0];
    }
    
    for (int i = 0; i < A.size(); i++) {
        result += A[i];
    }
    
    cout << result << endl;
    
    return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:28:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   28 |         sort(A.begin(), A.end());
      |         ^~~~
      |         short
Language: C++

#include <iostream>
#include <vector>
#include <cmath>

int main(){
int n;
	cin >> n;
vector <int> a(n);
vector <int> s(n,0);
for (int i = 0; i<n;i++){
cin >> a[i];
}
s[0] = a[0];
s[1] = max(s[1],0-a[0]-a[1]);
for (int i = 0; i < n-1;i++){
s[i+1] = max(s[i+1], s[i]+a[i+1]);
if (i>=1){
s[i+1] = max(s[i+1],s[i-1] - a[i] - a[i+1]);
}
if (i >=2){
s[i+1] = max(s[i+1], s[i-2]-a[i-1]+a[i]-a[i+1]);
}
}	
cout << s[n-1] << "\n";
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |         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:8:1: error: 'vector' was not declared in this scope
    8 | vector <int> a(n);
      | ^~~~~~
a.cc:8:1: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:8:9: error: expected primary-expression before 'int'
    8 | vector <int> a(n);
      |         ^~~
a.cc:9:9: error: expected primary-expression before 'int'
    9 | vector <int> s(n,0);
      |         ^~~
a.cc:11:8: error: 'a' was not declared in this scope
   11 | cin >> a[i];
      |        ^
a.cc:13:1: error: 's' was not declared in this scope
   13 | s[0] = a[0];
      | ^
a.cc:13:8: error: 'a' was not declared in this scope
   13 | s[0] = a[0];
      |        ^
a.cc:14:8: error: 'max' was not declared in this scope; did you mean 'std::max'?
   14 | s[1] = max(s[1],0-a[0]-a[1]);
      |        ^~~
      |        std::max
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: 'std::max' declared here
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
a.cc:24:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   24 | cout << s[n-1] << "\n";
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include<iostream>
using namespace std;
int main(){
  int N, flag=0, cnt=0; cin >> N;
  long long A[N];
  for(int i=0; i<N; i++){
    cin >> A[i];
    if(A[i] == 0){
      flag = 1;
      break;
    }
    if(A[i] < 0) cnt += 1;
  }
  
  if(cnt%2 == 0) flag = 1;
  
  int n=0;
  while(n<N) if(A[n] > 0) n++;
  int max = A[n];
  for(n=n; n<N; n++) if(A[n] < 0 && A[n] > max) max = A[n];
  long long ans=0;
  for(int i=0; i<N; i++){
    if(A[i]>0) ans += A[i];
    else ans -= A[i];
  if(flag == 0) ans += 2 * max;
  cout << ans << endl;
  
  return 0;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:2: error: expected '}' at end of input
   30 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  int N, flag=0, cnt=0; cin >> N;
  long long A[N];
  for(int i=0; i<N; i++){
    cin >> A[i];
    if(A[i] == 0){
      victory = 1;
      break;
    }
    if(A[i] < 0) cnt += 1;
  }
  
  if(cnt%2 == 0) flag = 1;
  
  int n=0;
  if(A[n] > 0) n++;
  max = A[n+1];
  for(; n<N; n++) if(A[n] > max) max = A[n];
  long long ans=0;
  for(int i=0; i<N i++) ans += abs(A[i]);
  if(victory == 0) ans = ans + 2 * max;
  cout << ans << endl;
  
  return 0;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:7: error: 'victory' was not declared in this scope
    9 |       victory = 1;
      |       ^~~~~~~
a.cc:19:14: error: overloaded function with no contextual type information
   19 |   max = A[n+1];
      |              ^
a.cc:20:27: error: invalid operands of types 'long long int' and '<unresolved overloaded function type>' to binary 'operator>'
   20 |   for(; n<N; n++) if(A[n] > max) max = A[n];
      |                      ~~~~~^~~~~
a.cc:20:43: error: overloaded function with no contextual type information
   20 |   for(; n<N; n++) if(A[n] > max) max = A[n];
      |                                           ^
a.cc:22:19: error: expected ';' before 'i'
   22 |   for(int i=0; i<N i++) ans += abs(A[i]);
      |                   ^~
      |                   ;
a.cc:23:6: error: 'victory' was not declared in this scope
   23 |   if(victory == 0) ans = ans + 2 * max;
      |      ^~~~~~~
a.cc:23:34: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator*'
   23 |   if(victory == 0) ans = ans + 2 * max;
      |                                ~~^~~~~
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main(void){
  long long n;
  std::vector<signed long long> A;

  cin >> n;
  A.resize(n);
  for (long long i=0;i<n;++i) {
    cin >> A[i];
  }
  sort(A.begin(), A.end(), [](auto a, auto b) {
    return abs(b) < abs(a);
  });
  
  for (unsigned long long i=0;i<n-1;++i) {
    if (A[i]<0) {
      A[i] = -A[i];
      A[i+1] = -A[i+1];
    }
  }
  /*
  for (int i=0;i<n;++i) {
    cout << A[i] << " ";
  }
  cout << endl;
  */

  unsigned long long MAX = 0;
  for (int i=0;i<n;++i) {
    MAX += A[i];
  }
  cout << MAX << endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   13 |   sort(A.begin(), A.end(), [](auto a, auto b) {
      |   ^~~~
      |   short
Language: C++

#include<bits/stdc++.h>
#define REP(i,n) for(int i=0;i<(n);++i)
#define INF 1e9
typedef long long llong;
using namespace std;

int main(){
	int n;
	cin>>n;
	
	vector<int> a(n);
	int cnt=0;//負の整数の数.
	bool jud=false;//負の整数の数が偶数個かどうか.
	bool jud0=false;//0があるかどうか.
	REP(i,n){
		scanf("%d",&a[i]);
		if(a[i]<0){
			++cnt;
			continue;
		}
		if(a[i]==0) jud0=true;
	}
	if(cnt%2==0) jud=true;
	
	llong sum=0
	if(jud||jud0){
		REP(i,n){
			if(a[i]<0) a[i]*=-1;
			sum+=a[i];
		}
		cout<<sum<<endl;
		return 0;
	}else{
		int tmp=INF;
		REP(i,n){
			if(a[i]<0) a[i]*=-1;
			tmp=min(tmp,a[i]);
			sum+=a[i];
		}
		cout<<sum-2*tmp<<endl;
		return 0;
	}
}//解説参考.かっこいい解法.

Compiler output:
a.cc: In function 'int main()':
a.cc:26:9: error: expected ',' or ';' before 'if'
   26 |         if(jud||jud0){
      |         ^~
a.cc:33:10: error: 'else' without a previous 'if'
   33 |         }else{
      |          ^~~~
Language: C++

import numpy as np

N = int(input())
A = np.array(map(int, input().split()))
if len(A[A<0])%2 == 0:
    ans = sum(abs(A))
else:
    A = sorted(abs(A))
    ans = sum(A[1:] - A[0])
print(ans)

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import numpy as np
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: C++

#include <stdio.h>
#include <limits.h>

long abs(long value)
{
  if(value < 0)
    return -1 * value;
  else
    return value;
}

int main(void){
  
  int NumOfJewel;
  long Input_Num[10000];
  int i, MIN_ABS = INT_MAX, tmp;
  int minus_count = 0;
  long result = 0;
  
  scanf('%d', &NumOfJewel);
  
  for(i = 0; i < NumOfJewel; i++) {
	scanf('%ld', &Input_Num[i]);
  }
  
  // 絶対値を加算
  // 絶対値最小値を記憶
  for(i = 0; i < NumOfJewel; i++) {
    if(Input_Num[i] < 0)
    {
      minus_count++;
    }
    tmp = abs(Input_Num[i]);
    if(tmp < MIN_ABS)
    {
      MIN_ABS = tmp;
    }
    result += tmp;
  }
  
  // マイナスの数が奇数なら最小値*(-2)を加算
  if(minus_count % 2 == 1)
  {
    result += MIN_ABS*(-2);
  }
  
  printf("%ld", result);
  
  return 0;

}

Compiler output:
a.cc:20:9: warning: multi-character character constant [-Wmultichar]
   20 |   scanf('%d', &NumOfJewel);
      |         ^~~~
a.cc:23:15: warning: multi-character character constant [-Wmultichar]
   23 |         scanf('%ld', &Input_Num[i]);
      |               ^~~~~
a.cc: In function 'int main()':
a.cc:20:9: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
   20 |   scanf('%d', &NumOfJewel);
      |         ^~~~
      |         |
      |         int
In file included from a.cc:1:
/usr/include/stdio.h:428:42: note:   initializing argument 1 of 'int scanf(const char*, ...)'
  428 | extern int scanf (const char *__restrict __format, ...) __wur;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
a.cc:23:15: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
   23 |         scanf('%ld', &Input_Num[i]);
      |               ^~~~~
      |               |
      |               int
/usr/include/stdio.h:428:42: note:   initializing argument 1 of 'int scanf(const char*, ...)'
  428 | extern int scanf (const char *__restrict __format, ...) __wur;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
Language: C++

#include<bits/stdc++.h>
//#define int long long
#define FOR(i, a, b) for (int i = a; i < b; ++i)
#define rep(N) for (int i = 0; i < N; ++i)
#define Rep(a, b) for (int i = a; i < b; ++i)
#define For(i, N) for (int i = 0; i < N; ++i)
#define all(v) v.begin(), v.end()
#define rev(v) v.rbegin(), v.rend()
#define mi(N) int N; cin >> N;
#define ms(s) string s; cin >> s;
#define md(d) double d; cin >> d;
#define mv(v, N) vi v(N); rep(N)cin >> v[i];
#define mod 1000000007

using namespace std;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vll = vector<ll>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
using vs = vector<string>;
using pii = pair<int, int>;
using pis = pair<int, string>;
using msi = map<string, int>;

template<typename T>
void say(T s) {
	cout << s << "\n";
}

template<typename T>
void say(vector<T> s) {
	auto itr = s.begin();
	cout << *(itr++);
	while (itr != s.end()) {
		cout << " " << *(itr++);
	}
	cout << "\n";
}

template<typename T>
void say(vector<T> s, char r) {
	auto itr = s.begin();
	cout << *(itr++);
	while (itr != s.end()) {
		cout << r << *(itr++);
	}
	cout << "\n";
}

void yn(bool b) {
	if (b)say("yes");
	else say("no");
}

void Yn(bool b) {
	if (b)say("Yes");
	else say("No");
}

void YN(bool b) {
	if (b)say("YES");
	else say("NO");
}

void Yay(bool b) {
	if (b)say("Yay!");
	else say(":(");
}

template<typename T>
void maxi(T& a, T b) {
	a = max(a, b);
}

template<typename T>
void mini(T& a, T b) {
	a = min(a, b);
}

void exact_say(double x) {
	cout << setprecision(numeric_limits<double>::max_digits10) << x << endl;
}

template<typename T>
vector<vector<T>> fill_vector(int h, int w, T val) {
	vector<vector<T>> ret;
	vector<T> v(w, val);
	rep(h)ret.push_back(v);
	return ret;
}

signed main() {
	mi(n);
	ll sum = 0;
	int cnt = 0;
	int Min = INT_MAX;
	rep(n) {
		mi(a);
		sum += abs(a);
		mini(Min, abs(a));
		cnt += a < 0;
	}
	if (cnt % 2 == 1)sum -= 2 * Min;
	say(ans);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:106:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
  106 |         say(ans);
      |             ^~~
      |             abs
Language: C++

#include<iostream>
#include<stdlib.h>
using namespace std;
int main(){
  int n;
  cin >> m;
  long long a, sum, min=1e9;
  for(int i=0;i<n;i++){
    cin >> a;
    sum+=abs(a);
    if(abs(a)<min)min=abs(a);
  }
  cout << sum-min*(n%2) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:10: error: 'm' was not declared in this scope
    6 |   cin >> m;
      |          ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int n,ans=0,low;cin>>n;
  for(int i=0;i<n,i++)
  {
    int a[i]=0;cin>>a[i];
    ans+=a[i];
  }
  for(int i=1;i<n;i++)
  {
    b[i]=a[i]+[i-1];
  }
  for(int i=2;i<n;i++)
  {
    low=min(b[i],b[i-1]);
  }
  cout<<ans-2*low<<endl;
}
  
  
  
    
    
    

Compiler output:
a.cc: In function 'int main()':
a.cc:5:22: error: expected ';' before ')' token
    5 |   for(int i=0;i<n,i++)
      |                      ^
      |                      ;
a.cc:7:14: error: array must be initialized with a brace-enclosed initializer
    7 |     int a[i]=0;cin>>a[i];
      |              ^
a.cc:12:5: error: 'b' was not declared in this scope
   12 |     b[i]=a[i]+[i-1];
      |     ^
a.cc:12:10: error: 'a' was not declared in this scope
   12 |     b[i]=a[i]+[i-1];
      |          ^
a.cc:12:17: error: expected ',' before '-' token
   12 |     b[i]=a[i]+[i-1];
      |                 ^
      |                 ,
a.cc:12:17: error: expected identifier before '-' token
a.cc: In lambda function:
a.cc:12:20: error: expected '{' before ';' token
   12 |     b[i]=a[i]+[i-1];
      |                    ^
a.cc: In function 'int main()':
a.cc:16:13: error: 'b' was not declared in this scope
   16 |     low=min(b[i],b[i-1]);
      |             ^
Language: C++

N = int(input())
A = list(map(int, input().split(' ')))

count = sum([a < 0 for a in A])
abss = [abs(a) for a in A]

if count % 2 == 0:
    print(sum(abss))
else:
    print(sum(abss) - min(abss)*2)


Compiler output:
a.cc:1:1: error: 'N' does not name a type
    1 | N = int(input())
      | ^
Language: C++

a = scanf("%d")(2:end);
l = nnz(a<0);
b = abs(a);
printf('%d',sum(b)-2*min(b)*mod(l,2));


Compiler output:
a.cc:4:8: warning: multi-character character constant [-Wmultichar]
    4 | printf('%d',sum(b)-2*min(b)*mod(l,2));
      |        ^~~~
a.cc:1:1: error: 'a' does not name a type
    1 | a = scanf("%d")(2:end);
      | ^
a.cc:2:1: error: 'l' does not name a type
    2 | l = nnz(a<0);
      | ^
a.cc:3:1: error: 'b' does not name a type
    3 | b = abs(a);
      | ^
a.cc:4:7: error: expected constructor, destructor, or type conversion before '(' token
    4 | printf('%d',sum(b)-2*min(b)*mod(l,2));
      |       ^
Language: C++

#include <iostream>
#include <math.h>
#include <vector>
#define min(a,b) (a<b?a:b)
using namespace std;
typedef long long ll;
ll a[100001];
int main()
{
	ll n, MIN = LLONG_MAX, cnt = 0, sum = 0;
	cin >> n;
	for (ll i = 0; i < n; i++)
	{
		cin >> a[i];
		MIN = min(MIN, llabs(a[i]));
		if (a[i] < 0)
			cnt++;
		sum += llabs(a[i]);
	}
	if (cnt & 1)
		sum -= 2 * MIN;
	cout << sum << endl;
	//system("pause");
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:21: error: 'LLONG_MAX' was not declared in this scope
   10 |         ll n, MIN = LLONG_MAX, cnt = 0, sum = 0;
      |                     ^~~~~~~~~
a.cc:4:1: note: 'LLONG_MAX' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    3 | #include <vector>
  +++ |+#include <climits>
    4 | #define min(a,b) (a<b?a:b)
a.cc:17:25: error: 'cnt' was not declared in this scope; did you mean 'int'?
   17 |                         cnt++;
      |                         ^~~
      |                         int
a.cc:18:17: error: 'sum' was not declared in this scope
   18 |                 sum += llabs(a[i]);
      |                 ^~~
a.cc:20:13: error: 'cnt' was not declared in this scope; did you mean 'int'?
   20 |         if (cnt & 1)
      |             ^~~
      |             int
a.cc:21:17: error: 'sum' was not declared in this scope
   21 |                 sum -= 2 * MIN;
      |                 ^~~
a.cc:22:17: error: 'sum' was not declared in this scope
   22 |         cout << sum << endl;
      |                 ^~~
Language: C++

#include <iostream>
#inlucde <cstdlib> 

using namespace std;
int main(){
	int N;
  	long long ans;
	cin >> N;
	int minA = 10000000000;
  	int a;
	int nNegative = 0;
  	for(int i=0; i < N; ++i){
		cin >> a;
      	int absA = abs(a);
      	if(a < 0) ++nNegative;
      	if(absA < minA) minA = absA;
		ans += absA;
    }
  
	if(nNegative%2 != 0) ans -= minA;
      
    cout << ans;
	return 0;
}

Compiler output:
a.cc:2:2: error: invalid preprocessing directive #inlucde; did you mean #include?
    2 | #inlucde <cstdlib>
      |  ^~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:9:20: warning: overflow in conversion from 'long int' to 'int' changes value from '10000000000' to '1410065408' [-Woverflow]
    9 |         int minA = 10000000000;
      |                    ^~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

int main() {
    cin.tie(0); ios::sync_with_stdio(false);
    // cout << setprecision(8) << setiosflags(ios::fixed);

    int n;
    cin >> n;

    vector<ll> a(n);
    for (auto &a_i : a) cin >> a_i;

    ll num_neg = 0, abs_sum = 0, idx_neg = -1, idx_pos = -1;
    for (int i = 0; i < n; ++i) {
        if (a[i] < 0) {
            ++num_neg;
            if (idx_neg == -1 || a[i] < a[idx_neg])
                idx_neg = i;
        }
        else {
            if (idx_pos == -1 || a[i] < a[idx_pos])
                idx_pos = i;
        }
        abs_sum += abs(a[i]);
    }

    if (num_neg % 2 == 0) cout << abs_sum << endl;
    else if (num_neg == n) {
        for (int i = 0; i < n; ++i)
            if (a[idx_pos] < a[i]) idx_pos = i;
        cout << abs_sum + 2 * a[idx_po] << endl;
    }
    else {
        cout << max(abs_sum + 2 * a[idx_neg],
            abs_sum - 2 * a[idx_pos]) << endl;
    }

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:33: error: 'idx_po' was not declared in this scope; did you mean 'idx_pos'?
   36 |         cout << abs_sum + 2 * a[idx_po] << endl;
      |                                 ^~~~~~
      |                                 idx_pos
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin>>N;
  vector<int>A(N);
  for(int i=0;i<N;i++){
    cin>>A.at(i);
  }
  vector<int>B1(N);
  vector<int>B2(N);
  B1.at(0)=A.at(0);
  B2.at(0)=A.at(i)*(-1);
  for(int i=0;i<N-1;i++){
    B1.at(i+1)=max(B1.at(i)+A.at(i+1),B2.at(i)-A.at(i+1));
    B2.at(i+1)=max(B2.at(i)+A.at(i+1),B1.at(i)-A.at(i+1));
  }
  sort(B1.begin(),B1.end());
  sort(B2.begin(),B2.end());
  cout<<max(B1.at(N-1),B2.at(N-1))<<endl;
}
            
  
  
  
  

Compiler output:
a.cc: In function 'int main()':
a.cc:13:17: error: 'i' was not declared in this scope
   13 |   B2.at(0)=A.at(i)*(-1);
      |                 ^
Language: C++

<?php

$N = trim(fgets(STDIN));
$A = explode(" ",trim(fgets(STDIN)));

$dp[0][0] = 0; // * +1
$dp[0][1] = min($A); // * -1

for ($i=1; $i < $N+1; $i++) { 
    $dp[$i][0] = max($dp[$i-1][0]+$A[$i-1],$dp[$i-1][1]-$A[$i-1]);
    $dp[$i][1] = max($dp[$i-1][0]-$A[$i-1],$dp[$i-1][1]+$A[$i-1]);
}

echo $dp[$N][0];

Compiler output:
a.cc:1:1: error: expected unqualified-id before '<' token
    1 | <?php
      | ^
a.cc:4:1: error: '$A' does not name a type
    4 | $A = explode(" ",trim(fgets(STDIN)));
      | ^~
a.cc:6:1: error: '$dp' does not name a type
    6 | $dp[0][0] = 0; // * +1
      | ^~~
a.cc:7:1: error: '$dp' does not name a type
    7 | $dp[0][1] = min($A); // * -1
      | ^~~
a.cc:9:1: error: expected unqualified-id before 'for'
    9 | for ($i=1; $i < $N+1; $i++) {
      | ^~~
a.cc:9:12: error: '$i' does not name a type
    9 | for ($i=1; $i < $N+1; $i++) {
      |            ^~
a.cc:9:23: error: '$i' does not name a type
    9 | for ($i=1; $i < $N+1; $i++) {
      |                       ^~
a.cc:14:1: error: 'echo' does not name a type
   14 | echo $dp[$N][0];
      | ^~~~
Language: C++

#include <bits/stdc..+h>
using namespace std;
int main(){
  long n;
  cin>>n;
  long a[n];
  long ans = 0;
  long minus = 0;
  long syou = 10000000000;
  for(int i = 0;i<n;i++){
    cin >> a[i];
    ans += abs(a[i]);
    if(a[i] < 0){
      minus++;
    }
    syou = min(syou,a[i]);
  }
  if(minus%2 ==0){
    cout<<ans<<endl;
  }
  else{
    cout<<ans-2*syou<<endl;
  }
  return 0;
}

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

#include <cstdlib>
//using namespace std;

int main(){
	int n, min, minus = 0, zero = 0;
	long long a[100000], ab[100000], min_val = 1000000001, res = 0;
	
	scanf("%d", &n);
	for(int i = 0; i < n; i++){
		scanf("%lld", &a[i]);
		ab[i] = (a[i] < 0 ? -1 : 1) * a[i];
		if(a[i] < 0) minus++;
		if(a[i] == 0) zero = 1;
		if(ab[i] < min_val) min = i;
	}
	
	if(minus % 2 == 0 || zero == 1){
		for(int i = 0; i < n; i++){
			res += ab[i];
		}
	}
	else{
		for(int i = 0; i < n; i++){
			if(i == min) res -= ab[i];
			else res += ab[i];
		}
	}
	
	printf("%lld\n", res);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'scanf' was not declared in this scope
    8 |         scanf("%d", &n);
      |         ^~~~~
a.cc:29:9: error: 'printf' was not declared in this scope
   29 |         printf("%lld\n", res);
      |         ^~~~~~
a.cc:2:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
    1 | #include <cstdlib>
  +++ |+#include <cstdio>
    2 | //using namespace std;
Language: C++

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

int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for(int i = 0; i < N; i++){
    cin >> A[i];
  }
  int count = 0;
  for(int i = 0; i < N; i++){
    if(A[i] < 0){
      count++;
    }
  }
  int ans = 0;
  if(count % 2 == 0){
    for(int i = 0; i < N; i++){
      ans += abs(A[i]);
    }
  }
  if(count % 2 == 1){
    int m = 1000000001;
    for(int i = 0; i < N; i++){
      m = min(m,abs(A[i]));
    }
    for(int i = 0; i < N; i++){
        ans += abs(A[i]);
      }
    }
    ans -= 2 *m; 
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:32:15: error: 'm' was not declared in this scope
   32 |     ans -= 2 *m;
      |               ^
a.cc: At global scope:
a.cc:34:3: error: 'cout' does not name a type
   34 |   cout << ans << endl;
      |   ^~~~
a.cc:35:1: error: expected declaration before '}' token
   35 | }
      | ^
Language: C++

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

int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for(int i = 0; i < N; i++){
    cin >> A[i];
  }
  int count = 0;
  for(int i = 0; i < N; i++){
    if(A[i] < 0){
      count++;
    }
  }
  int ans = 0;
  if(count % 2 == 0){
    for(int i = 0; i < N; i++){
      ans += abs(A[i]);
    }
  }
  if(count % 2 == 1){
    int m = 999999999;
    for(int i = 0; i < N; i++){
      m = min(m,abs(A[i]));
    }
    int v = 0;
    for(int i = 0; i < N; i++){
      if(abs(A[i] == m){
        v = i;
        break;
      }
    }
    for(int i = 0; i < N; i++){
      if(i != v){
        ans += abs(A[i]);
      }
    }
    ans -= m; 
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:24: error: expected ')' before '{' token
   30 |       if(abs(A[i] == m){
      |         ~              ^
      |                        )
a.cc:34:5: error: expected primary-expression before '}' token
   34 |     }
      |     ^