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

#include<string.h>
using namespace std;

int main()
{
    int H, W;
    int h, w;
    cin >> H>>W;
    cin >> h>>w;
    int Z, z;
    Z = H * W;
    z = h * W + H * w;
    if (H == h or W == w){
        std::cout << 0 << std::endl;

    }
    else {
        int R, r;
        r = h * w;
        R = Z - z + r;
        std::cout << R << std::endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'cin' was not declared in this scope
    8 |     cin >> H>>W;
      |     ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include<string.h>
  +++ |+#include <iostream>
    2 | using namespace std;
a.cc:14:14: error: 'cout' is not a member of 'std'
   14 |         std::cout << 0 << std::endl;
      |              ^~~~
a.cc:14:14: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:14:32: error: 'endl' is not a member of 'std'
   14 |         std::cout << 0 << std::endl;
      |                                ^~~~
a.cc:2:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    1 | #include<string.h>
  +++ |+#include <ostream>
    2 | using namespace std;
a.cc:21:14: error: 'cout' is not a member of 'std'
   21 |         std::cout << R << std::endl;
      |              ^~~~
a.cc:21:14: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:21:32: error: 'endl' is not a member of 'std'
   21 |         std::cout << R << std::endl;
      |                                ^~~~
a.cc:21:32: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: C++

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

int main() {
  int H,W,h,w;
  cun>>H>>W>>h>>w;
  int sum=H*W;
  int minus=W*h+H*w-h*w;
  cout<<sum-minus<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cun' was not declared in this scope
    6 |   cun>>H>>W>>h>>w;
      |   ^~~
Language: C

#include <stdio.h>

int main(void)
{
        int H,W,h,w,c=0;
        scanf("%d%d%d%d",&H,&W,&h,&w);

        c=H*h+(W-h)*w
        printf("%d\n",c);
        return 0;
}


Compiler output:
main.c: In function 'main':
main.c:8:22: error: expected ';' before 'printf'
    8 |         c=H*h+(W-h)*w
      |                      ^
      |                      ;
    9 |         printf("%d\n",c);
      |         ~~~~~~
Language: C

#include <stdio.h>

int main(void)
{
        int H,W,h,w;
        scanf("%d%d%d%d",&H,&W,&h,&w);
        int a[H][W];

        for(i=0;i<H;i++)
                for(j=0;j<W;j++)
                        a[i][j]=1;
        int i,j,c=0;
        for(i=0;i<h;i++){
                for(j=0;j<H;j++)
                        a[i][j]=0;

        }
        for(i=0;i<w;i++){
                for(j=0;j<W;i++)
                        a[j][i]=0;
        }
        for(i=0;i<H;i++)
                for(j=0;j<W;j++)
                        if(a[i][j]==0)c++;

        printf("%d\n",W*H-c);
        return 0;
}


Compiler output:
main.c: In function 'main':
main.c:9:13: error: 'i' undeclared (first use in this function)
    9 |         for(i=0;i<H;i++)
      |             ^
main.c:9:13: note: each undeclared identifier is reported only once for each function it appears in
main.c:10:21: error: 'j' undeclared (first use in this function)
   10 |                 for(j=0;j<W;j++)
      |                     ^
Language: C

#include <stdio.h>

int main(void)
{
        int H,W,h,w;
        scanf("%d%d%d%d",&H,&W,&h,&w);
        int a[H][W]={1};

        int i,j,c=0;
        for(i=0;i<h;i++){
                for(j=0;j<H;j++)
                        a[i][j]=0;

        }
        for(i=0;i<w;i++){
                for(j=0;j<W;i++)
                        a[j][i]=0;
        }
        for(i=0;i<H;i++)
                for(j=0;j<W;j++)
                        if(a[i][j]==0)c++;

        printf("%d\n",W*H-c);
        return 0;
}


Compiler output:
main.c: In function 'main':
main.c:7:21: error: variable-sized object may not be initialized except with an empty initializer
    7 |         int a[H][W]={1};
      |                     ^
Language: C++

#inlcude<bits/stdc++.h>
using namespace std;
int main()
{
  	int W,H,w,h;
 	cin>>W>>H>>w>>h;
 	cout<<(W*H - w*h)<<endl;
 	return 0;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inlcude; did you mean #include?
    1 | #inlcude<bits/stdc++.h>
      |  ^~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin>>W>>H>>w>>h;
      |         ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | #inlcude<bits/stdc++.h>
a.cc:7:9: error: 'cout' was not declared in this scope
    7 |         cout<<(W*H - w*h)<<endl;
      |         ^~~~
a.cc:7:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:7:28: error: 'endl' was not declared in this scope
    7 |         cout<<(W*H - w*h)<<endl;
      |                            ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | #inlcude<bits/stdc++.h>
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep2(i, a, b) for(int i = (a); i < (b); i++)
typedef long long ll;

int main() {
   int H, W, h, w;
   cin H >> W >> h >> w;

   cout << (H - h) * (W - w) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:7: error: expected ';' before 'H'
    9 |    cin H >> W >> h >> w;
      |       ^~
      |       ;
Language: C

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

int main() {
    int H, W, h, w;
    cin >> H >> W >> h >> w;

    cout << (H - h) * (W - w) << endl;
    return 0; 
}

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

int main() {
  int H, W, h, w;
  std::cin >> H >> W >> h >> w;
  std::cout << (H - h) * (W - w);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:8: error: 'cin' is not a member of 'std'
    3 |   std::cin >> H >> W >> h >> w;
      |        ^~~
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:4:8: error: 'cout' is not a member of 'std'
    4 |   std::cout << (H - h) * (W - w);
      |        ^~~~
a.cc:4:8: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int H,W;
  cin >> H >> W;
  int h,w;
  cin >> h >> w;
  int ans=W*H;
  cout << ans-h*W-(H-h)*w;

Compiler output:
a.cc: In function 'int main()':
a.cc:9:27: error: expected '}' at end of input
    9 |   cout << ans-h*W-(H-h)*w;
      |                           ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int main(){
  int a,b,c,d;
  cin >> a >> b >> c >> d;
  cout << (a-c)(b-d) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:16: error: expression cannot be used as a function
    7 |   cout << (a-c)(b-d) << endl;
      |           ~~~~~^~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll  long long
#define FASTINOUT ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const ll mod = 1e9+7;
const int N=2e5+9;
int main()
{
    FASTINOUT;
    int x,y,a,b;
    cin>>x>>t>>a>>b;
    cout<<(x-a)*(t-b);
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 't' was not declared in this scope
   11 |     cin>>x>>t>>a>>b;
      |             ^
Language: C++

#include <iostream>
using namespace std;

int main(){
	H,W,h,w,o;
	cin >> H >> W >> h >> w;
	o= h*W+H*w - h*w;
	cout << H*W-o;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'H' was not declared in this scope
    5 |         H,W,h,w,o;
      |         ^
a.cc:5:11: error: 'W' was not declared in this scope
    5 |         H,W,h,w,o;
      |           ^
a.cc:5:13: error: 'h' was not declared in this scope
    5 |         H,W,h,w,o;
      |             ^
a.cc:5:15: error: 'w' was not declared in this scope
    5 |         H,W,h,w,o;
      |               ^
a.cc:5:17: error: 'o' was not declared in this scope
    5 |         H,W,h,w,o;
      |                 ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

long long xorsum(long long inp) {
  if (inp % 4 == 0) {
    return in;
  }
  
  if (inp % 4 == 1) {
    return inp ^ (inp - 1);
  }
  
  if (inp % 4 == 2) {
    return inp ^ 1;
  }
  
  if (inp % 4 == 3) {
    return 0;
  }
}

int main() {
  long long A, B;
  
  cin >> A >> B;
  
  cout << (xorsum(B) ^ xorsum(A - 1)) << endl;
  return 0;
}

Compiler output:
a.cc: In function 'long long int xorsum(long long int)':
a.cc:7:12: error: 'in' was not declared in this scope; did you mean 'inp'?
    7 |     return in;
      |            ^~
      |            inp
Language: C++

#include<iostream>
int main(){
  int H,W,h,w;cin>>H>>W>>h>>w;
  cout<<H*W-h*w;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:15: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    3 |   int H,W,h,w;cin>>H>>W>>h>>w;
      |               ^~~
      |               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:4:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    4 |   cout<<H*W-h*w;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

H,W=map(int, input().split())
h,w=map(int, input().split())
print((H-h)*(W-w))

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | H,W=map(int, input().split())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'H' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'W' [-Wimplicit-int]
    1 | H,W=map(int, input().split())
      |   ^
main.c:1:5: error: implicit declaration of function 'map' [-Wimplicit-function-declaration]
    1 | H,W=map(int, input().split())
      |     ^~~
main.c:1:9: error: expected expression before 'int'
    1 | H,W=map(int, input().split())
      |         ^~~
main.c:2:1: error: expected ',' or ';' before 'h'
    2 | h,w=map(int, input().split())
      | ^
Language: Java

import java.util.Scanner;
public class Program {
public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int h = sc.nextInt();
    int w = sc.nextInt();
    int ch = sc.nextInt();
    int cw = sc.nextInt();

    int total = h*w;
    int black = ch*w + (h-ch)*cw;
    System.out.println(total -black);

  }
}


Compiler output:
Main.java:2: error: class Program is public, should be declared in a file named Program.java
public class Program {
       ^
1 error
Language: C++

# include < bits / stdc ++. h >
using namespace std ;
int main () {
	int H , W ; cin >> H >> W ;
	int h , w ; cin >> h >> w ;
	int ans = ( H - h ) * ( W - w );
	cout << ans << endl ;
  	return 0;
}

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

# include < bits / stdc ++. h >
using namespace std ;
int main () {
int H , W ; cin >> H >> W ;
int h , w ; cin >> h >> w ;
int ans = ( H - h ) * ( W - w );
cout << ans << endl ;
}

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

using namespace std;
int main(void){
    int H, W, h, w;
    cin >> H >> W >> h >> w;
    cout << H * W - (h * W + w * (H - h));
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:5: error: 'cin' was not declared in this scope
    4 |     cin >> H >> W >> h >> w;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:5:5: error: 'cout' was not declared in this scope
    5 |     cout << H * W - (h * W + w * (H - h));
      |     ^~~~
a.cc:5:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: Java

import java.util.Arrays;
import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n=sc.nextInt();
    int m = sc.nextInt();
    int c = sc.nextInt();
    int[] b = new int[m];
    int sum = 0;
    int count = 0;
    for(int k=0;k<b.length;k++) {
      b[k] = sc.nextInt();
    }
    int i=0;
    while(i<n) {
      int[] a = new int[m];
      for(int j=0;j<m;j++) {
        a[j] = sc.nextInt();
      }
      for(int x=0;x<m;x++) {
        sum=sum + a[x] * b[x];
      }
      sum = sum+c;
      count = count + (sum>0) ? 1:0;
      i++;
    }
    System.out.println(count);



    }
  }


Compiler output:
Main.java:26: error: bad operand types for binary operator '+'
      count = count + (sum>0) ? 1:0;
                    ^
  first type:  int
  second type: boolean
1 error
Language: C

#include <stdio.h>

int main(void){
  int hh, ww, h, w;
  scanf("%d %d", &hh, &ww);
  scanf("%d %d", &h, &w);
  
  sum = hh*ww - (h*hh + w*ww) + h*w;
  printf("%d", sum);
  return 0;
}

  

Compiler output:
main.c: In function 'main':
main.c:8:3: error: 'sum' undeclared (first use in this function)
    8 |   sum = hh*ww - (h*hh + w*ww) + h*w;
      |   ^~~
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <iostream>

using namespace std;

int main(){
    int h;
    int w;
    int h1;
    int w1;
    cin >> h >> w;
    cin >> h1 >> w2;
    int result = (h - h1) * (w - w1);
    cout << result << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:18: error: 'w2' was not declared in this scope; did you mean 'w1'?
   11 |     cin >> h1 >> w2;
      |                  ^~
      |                  w1
Language: C++

#include <iostream>

using namespace std;

int main()[
    int h;
    int w;
    int h1;
    int w1;
    cin >> h >> w;
    cin >> h1 >> w2;
    int result = (h - h1) * (w - w1);
    cout <<  << endl;
]

Compiler output:
a.cc:6:5: error: expected primary-expression before 'int'
    6 |     int h;
      |     ^~~
a.cc:5:12: error: expected ']' before 'int'
    5 | int main()[
      |            ^
      |            ]
    6 |     int h;
      |     ~~~     
a.cc:10:5: error: 'cin' does not name a type
   10 |     cin >> h >> w;
      |     ^~~
a.cc:11:5: error: 'cin' does not name a type
   11 |     cin >> h1 >> w2;
      |     ^~~
a.cc:12:19: error: 'h' was not declared in this scope
   12 |     int result = (h - h1) * (w - w1);
      |                   ^
a.cc:13:5: error: 'cout' does not name a type
   13 |     cout <<  << endl;
      |     ^~~~
a.cc:14:1: error: expected unqualified-id before ']' token
   14 | ]
      | ^
Language: C++

#include <iostream>
using namespace std;
int a,b,c,d;
int main()
{
cin>>a>>b>>c>>d;
cout<<(a-b)(c-d);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: expression cannot be used as a function
    7 | cout<<(a-b)(c-d);
      |       ~~~~~^~~~~
Language: C++

#include <iostream>
using namespace std;
int a,b,c;
int main()
{
cin>>a>>b>>c>>d;
cout<<(a-b)(c-d);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: 'd' was not declared in this scope
    6 | cin>>a>>b>>c>>d;
      |               ^
a.cc:7:16: error: expression cannot be used as a function
    7 | cout<<(a-b)(c-d);
      |                ^
Language: C++

#include <bits/stdc++.h>
#include <string>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <numeric>
using namespace std;


int main(){
    int h,w;
    cin >> h >> w;
    vector<vector<int>> grid(h, vector<int>(w));
    int A,B;
    cin >> A >> b;
    int ans = 0;
    for (int i = 0; i < A; i++) {
        for (int j = 0; j < B; j++) {
            grid.at(i).at(j) = 1;
        }
    }

    for (int k = 0; k < A; k++) {
        for (int l = 0; l < B; l++) {
            if(grid.at(k).at(l) == 1){
                ans++;
            }
        }
    }

    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:17: error: 'b' was not declared in this scope
   15 |     cin >> A >> b;
      |                 ^
Language: C++

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

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll H,W; cin >> H >> W;
  ll h,w; cin >> h >> w;
  ll ans = H*W - (H*w+W*h-w*h)
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:3: error: expected ',' or ';' before 'return'
   11 |   return 0;
      |   ^~~~~~
Language: C++

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

int main() {
  int H;
  cin >> H;
  int W;
  cin >> W;
  int h;
  cin >> h;
  int w;
  int w;
  cout << (H - h) * (W - w) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:7: error: redeclaration of 'int w'
   12 |   int w;
      |       ^
a.cc:11:7: note: 'int w' previously declared here
   11 |   int w;
      |       ^
Language: C++

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


int main() {
  int H,W,h,w,;
  cin >> H >> W >> h >> w ;
  cout << H*W-h*W-H*w+h*w;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: expected unqualified-id before ';' token
    6 |   int H,W,h,w,;
      |               ^
Language: C++

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

int main()
{
	int H,W; cin >> H >> W;
    int h,w; cin >> h >> w;
    
    int ans - (H - h) * (W - w);
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: expected initializer before '-' token
    9 |     int ans - (H - h) * (W - w);
      |             ^
a.cc:10:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   10 |     cout << ans << endl;
      |             ^~~
      |             abs
Language: C++

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

int main(){
	int h,w,W,H;
    cin>>H>>W;
	cin>>h>>w;
	cout<<(H-h)*(W-w)<<endl;
	return 0;
	}


Compiler output:
a.cc:4:14: error: expected '{' before ';' token
    4 | namespace std;
      |              ^
a.cc: In function 'int main()':
a.cc:8:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |     cin>>H>>W;
      |     ^~~
      |     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:10:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |         cout<<(H-h)*(W-w)<<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:10:28: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 |         cout<<(H-h)*(W-w)<<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<stdio.h>
    int main(){
        int H, W, h, w;
        scanf("%d%d",&H,&W);
        scanf("&d&d",&h,&w);
        printf("", H * W -);    
        return 0;
    }

Compiler output:
main.c: In function 'main':
main.c:6:27: error: expected expression before ')' token
    6 |         printf("", H * W -);
      |                           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main{
int w,h,a,b;
cin>>w>>h>>a>>b;
w-=a;h-=b;cout<<w*h<<endl;
}

Compiler output:
a.cc:3:5: error: cannot declare '::main' to be a global variable
    3 | int main{
      |     ^~~~
a.cc:4:1: error: expected primary-expression before 'int'
    4 | int w,h,a,b;
      | ^~~
a.cc:4:1: error: expected '}' before 'int'
a.cc:3:9: note: to match this '{'
    3 | int main{
      |         ^
a.cc:5:1: error: 'cin' does not name a type
    5 | cin>>w>>h>>a>>b;
      | ^~~
a.cc:6:1: error: 'w' does not name a type
    6 | w-=a;h-=b;cout<<w*h<<endl;
      | ^
a.cc:6:6: error: 'h' does not name a type
    6 | w-=a;h-=b;cout<<w*h<<endl;
      |      ^
a.cc:6:11: error: 'cout' does not name a type
    6 | w-=a;h-=b;cout<<w*h<<endl;
      |           ^~~~
a.cc:7:1: error: expected declaration before '}' token
    7 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int H,W,h,w;
 
int main () {
	cin >> H >> W >> h >> w;
	cout << (H-h)*(W-w) endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:28: error: expected ';' before 'endl'
    8 |         cout << (H-h)*(W-w) endl;
      |                            ^~~~~
      |                            ;
Language: C++

#include <iostream>
using namespace std;
int main(){
int H, W, h, w;
cin >> H >> W >> h >> w;
cout << H*W-(h*W)-(w*(H-h) << endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:28: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
    6 | cout << H*W-(h*W)-(w*(H-h) << endl;
      |                    ~~~~~~~~^~~~~~~
a.cc:6:35: error: expected ')' before ';' token
    6 | cout << H*W-(h*W)-(w*(H-h) << endl;
      |                   ~               ^
      |                                   )
Language: C++

#include <iostream>
using namespace std;
int main(){
int x, y, a, b;
cin >> x >> y >> a >> b;
cout << x*y-(a*y)-(b*(x-a) << endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:28: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
    6 | cout << x*y-(a*y)-(b*(x-a) << endl;
      |                    ~~~~~~~~^~~~~~~
a.cc:6:35: error: expected ')' before ';' token
    6 | cout << x*y-(a*y)-(b*(x-a) << endl;
      |                   ~               ^
      |                                   )
Language: C++

#include<bits/stdc++.h>

using namespace std;

const int MAX = 30;

int c[MAX][MAX];

int main() {
  int h, w;
  cin >> h >> w;
  int a, b;
  cin >> a >> b;
  for (int i = 0; i < a; ++i)
    for (int j = 0; j < w; ++j)
      c[i][j] = 1;
  for (int i = 0; i < h; ++i)
    for (int j = 0; j < b; ++j)
      c[i][j] = 1;
  int ans = 0;
  for (int i = 0; i < h; ++i)
    for (int j = 0; j < w; ++j)
      ans += c[i][j] == 0;
  cout << ans;

Compiler output:
a.cc: In function 'int main()':
a.cc:24:15: error: expected '}' at end of input
   24 |   cout << ans;
      |               ^
a.cc:9:12: note: to match this '{'
    9 | int main() {
      |            ^
Language: C++

#include<iostream>
#include<iomanip>
#include<cstdio>
#include<string>
#include<cstring>
#include<climits>
#include<algorithm>
#include<vector>
#include<cmath>
#include<map>
#include<set>
#include<stack>
#include<queue>
#include<deque>
#include<tuple>
#include<list>
#include<unordered_map>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vii vector<int>
#define vll vector<ll>
#define lb lower_bound
#define pb push_back
#define mp make_pair
#define rep(i,n) for(ll i=0;i<n;i++)
#define rep2(i,a,b) for(ll i=a;i<b;i++)
#define repr(i,n) for(ll i=n-1;i>=0;i--)
#define all(x) x.begin(),x.end()
#define INF (1 << 30) - 1
#define LLINF (1LL << 61) - 1
// #define int ll
using namespace std;
const int MOD = 1000000007;
const int MAX = 510000;
 

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll a,a,c,d;
    cin>>a>>b>>c>>d;
    cout<<(a-c)*(b-d)<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:41:10: error: redeclaration of 'long long int a'
   41 |     ll a,a,c,d;
      |          ^
a.cc:41:8: note: 'long long int a' previously declared here
   41 |     ll a,a,c,d;
      |        ^
a.cc:42:13: error: 'b' was not declared in this scope
   42 |     cin>>a>>b>>c>>d;
      |             ^
Language: Java

import java.util.*;
public class AWhiteCells{
  public static void main(String[]args){
      Scanner sc = new Scanner(System.in);

      int H = sc.nextInt();
      int W = sc.nextInt();
      int h = sc.nextInt();
      int w = sc.nextInt();

      int all = H*W;

      if(all-(h*W+(H-h)*w)<=0){
        System.out.println(0);
        System.exit(0);
      }
      System.out.println(all-(h*W+(H-h)*w));
  }
}


Compiler output:
Main.java:2: error: class AWhiteCells is public, should be declared in a file named AWhiteCells.java
public class AWhiteCells{
       ^
1 error
Language: C++

#include<bits/sdtc++.h>

using namespace std;

int main (){
  int h,w,H,W;
  
  cin >> H >> W>>h>>w;
  cout<< H*W-h*W-H*w+h*w;
  return 0;
}


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

#include<bits/sdtc++.h>

using namespace std;

int main (){
  int h,w,H,W;
  
  cin >> H >> W>>h>>w;
  cout<< h*w-h*W-H*w+h*w;
  return 0;
}

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

#include<iostream>
#include<bits/stdc++.h>
#include<string>
using namespace std;
int main()
{
  int H,W,h,w ;
  cin >> H >> W >> h >> w ;
  
  cout << (H-h)*(W-w) <<  ;
  
  return 0 ;

      
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:10:27: error: expected primary-expression before ';' token
   10 |   cout << (H-h)*(W-w) <<  ;
      |                           ^
Language: C++

#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<cmath>
#include<tuple>
#include<string>
typedef unsigned long long ll;
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define F first
#define S second
using namespace std;
const ll INF = 1e12;
const int i_INF = 2147483647;

int main() {
  int H,W,h,w;
  cin>>H>>W>>h>>w;
  cout<<(H-h)*(W-w)<<endl;
}
}

Compiler output:
a.cc:21:1: error: expected declaration before '}' token
   21 | }
      | ^
Language: Java

import java.util.Scanner;

public class A {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int h = sc.nextInt();
        int w = sc.nextInt();
        int paintedRows = sc.nextInt();
        int paintedCols = sc.nextInt();

        System.out.println((h-paintedRows) * (w-paintedCols));
    }
}

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

//自称高知能系Vtuberの高井茅乃です。
//Twitter: https://twitter.com/takaichino
//YouTube: https://www.youtube.com/channel/UCTOxnI3eOI_o1HRgzq-LEZw

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

#define INF 1999999999
#define REP(i,n) for(int i=0;i<n;i++)
#define MODA 1000000007 

int main() {
    int ans = 0;
	int H, h, W, w;
	cin >> H >> W >> h >> w;
    cout << (H-h)*(W-w)) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:24: error: expected ';' before ')' token
   17 |     cout << (H-h)*(W-w)) << endl;
      |                        ^
      |                        ;
Language: C++

#include <set>
#include <map>
#include <list>
#include <queue>
#include <stack>
#include <cmath>
#include <ctime>
#include <cstdio>
#include <vector>
#include <string>
#include <bitset>
#include <cctype>
#include <cstdlib>
#include <cstring>
#include <utility>
#include <numeric>
#include <complex>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <cassert>
#include <iostream>
#include <iterator>
#include <algorithm>
using namespace std;
typedef long long ll;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define rep(i, n) REP(i, 0, n)
#define all(v) v.begin(), v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define INF 2e9
signed main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int a,b,w,h;
    cin>>h>>w>>a>>b;
    cout<<(h-a)*(w-b);
  
  
  
    retrun(0);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:5: error: 'retrun' was not declared in this scope
   42 |     retrun(0);
      |     ^~~~~~
Language: C++

int main (){
    int A, B, C, D;
    cin>>A>>B>>C>>D;
    cout<<(A-C)*(B-D)<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin>>A>>B>>C>>D;
      |     ^~~
a.cc:4:5: error: 'cout' was not declared in this scope
    4 |     cout<<(A-C)*(B-D)<<endl;
      |     ^~~~
a.cc:4:24: error: 'endl' was not declared in this scope
    4 |     cout<<(A-C)*(B-D)<<endl;
      |                        ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int A,B,C;
  cin >> H >> W >> h >> w;
  int Y = H*W;
  int X = h*w;
  cout << Y-X << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:10: error: 'H' was not declared in this scope
    5 |   cin >> H >> W >> h >> w;
      |          ^
a.cc:5:15: error: 'W' was not declared in this scope
    5 |   cin >> H >> W >> h >> w;
      |               ^
a.cc:5:20: error: 'h' was not declared in this scope
    5 |   cin >> H >> W >> h >> w;
      |                    ^
a.cc:5:25: error: 'w' was not declared in this scope
    5 |   cin >> H >> W >> h >> w;
      |                         ^
Language: C++

#include <iostream>

using namespace std;

void main()
{
	int H,h,W,w;
	cin>>H>>W;
  	cin>>h>>w;

	H = H-h;
	W = W-w;
	int prod=0;
	prod = H*W;
	cout<<prod;
}


Compiler output:
a.cc:5:1: error: '::main' must return 'int'
    5 | void main()
      | ^~~~
Language: C++

#include <isotream>
using namespace std;

int main()
{
	int H,h,W,w;
	cin>>H>>W;
  	cin>>h>>w;

	H = H-h;
	W = W-w;
	int prod=0;
	prod = H*W;
	cout<<prod;
  return 0;
}


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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    int H,W,h,w;
  cin >> H,W,h,w
  cout << ((H-h)*(W-w));
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:17: error: expected ';' before 'cout'
    6 |   cin >> H,W,h,w
      |                 ^
      |                 ;
    7 |   cout << ((H-h)*(W-w));
      |   ~~~~
Language: Java

import java.util.*;

public class ABC121a{
  public static void main(String[]args){
    Scanner sc=new Scanner(System.in);
    int H=sc.nextInt();
    int W=sc.nextInt();
    int h=sc.nextInt();
    int w=sc.nextInt();
    System.out.println(H*W-h*W-H*w+h*w);
  }
}


Compiler output:
Main.java:3: error: class ABC121a is public, should be declared in a file named ABC121a.java
public class ABC121a{
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
  int main () {
  int H , W , h ,w ,X;
    
  cin >> H >> W >> h >> w >> R;
  
  R == ( h * W ) + ( H * w ) - ( h * w );
  X == H * W - R; 
    
  cout << X;
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:6:30: error: 'R' was not declared in this scope
    6 |   cin >> H >> W >> h >> w >> R;
      |                              ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
  int main () {
  int H , W , h ,w ,X;
    
  cin >> H >> W >> h >> w;
  
  X == H * W - ( h * W + H * w - h * w ) ; 
    
  cout << X;

Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: expected '}' at end of input
   10 |   cout << X;
      |             ^
a.cc:3:15: note: to match this '{'
    3 |   int main () {
      |               ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
  int main () {
  int H , W , h ,w ,X;
    
  cin >> H >> W >> h >> w;
  
  X == H * W - ( h * W + H * w - h - w )  
    
  cout << X;
 
  }   

Compiler output:
a.cc: In function 'int main()':
a.cc:8:41: error: expected ';' before 'cout'
    8 |   X == H * W - ( h * W + H * w - h - w )
      |                                         ^
      |                                         ;
    9 | 
   10 |   cout << X;
      |   ~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
  int main () {
  int H , W , h ,w;
    
  cin >> H >> W >> h >> w;
  
  X == H * W - ( h * W + H * w - h - w )  
    
  cout << X;
 
  }   

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'X' was not declared in this scope
    8 |   X == H * W - ( h * W + H * w - h - w )
      |   ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  int H,W,h,w;
  cin >> H >> W;
  cin >> h >> w;
  int white=H*W;
  int black=h*W+w*H-h*w
  cout << white-black << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: expected ',' or ';' before 'cout'
   10 |   cout << white-black << endl;
      |   ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    int H, W, h, w;
    cin >> H >> W >> h >> w;
    cout << h * W + w * H - w * h
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:34: error: expected ';' before '}' token
    7 |     cout << h * W + w * H - w * h
      |                                  ^
      |                                  ;
    8 | }
      | ~
Language: C

#include<stdio.h>
 
int main(void){
  int H,W,h,w,;
  scanf("%d%d",&H,&W);
  scanf("%d%d",&h,&w);
  printf("%d",(W-w)*(H-h));
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:15: error: expected identifier or '(' before ';' token
    4 |   int H,W,h,w,;
      |               ^
Language: C

#include<stdio.h>

main(void){
  int H,W,h,w,;
  scanf("%d%d",&H,&W);
  scanf("%d%d",&h,&w);
  printf("%d",(W-w)*(H-h));
  return 0;
}
  
  

Compiler output:
main.c:3:1: error: return type defaults to 'int' [-Wimplicit-int]
    3 | main(void){
      | ^~~~
main.c: In function 'main':
main.c:4:15: error: expected identifier or '(' before ';' token
    4 |   int H,W,h,w,;
      |               ^
Language: C++

#include <iostream>
int main() {
    int H, W, h, w;
    cin >> H >> W;
    cin >> h >> w;
    cout << (H-h)*(W-w);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |     cin >> H >> W;
      |     ^~~
      |     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:6:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |     cout << (H-h)*(W-w);
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include "bits/stdc++.h"
#define ll long long
#define FOR(x) for(ll i = 0;i<(x);i++)
#define ALL(v) (v).begin(),(v).end()


using namespace std;


int main(){
ll H,W,h,w;
cin>>H>>W>>h>>w;

ll ans = H*W - H*w -w(H-h);

if(ans>0)
cout<<ans<<"\n";
else
cout<<0<<"\n";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:22: error: 'w' cannot be used as a function
   14 | ll ans = H*W - H*w -w(H-h);
      |                     ~^~~~~
Language: C++

#inclu#include <iostream>
#include <math.h>
#include <vector>
using namespace std;
int main() {
    int H,W,h ,w ;
    //vector<long long int> v(n);
    cin >> H>> W>> h >>w ;
    cout << H*W-  h*w;
    return 0;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inclu; did you mean #include?
    1 | #inclu#include <iostream>
      |  ^~~~~
      |  include
a.cc: In function 'int main()':
a.cc:8:5: error: 'cin' was not declared in this scope
    8 |     cin >> H>> W>> h >>w ;
      |     ^~~
a.cc:4:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include <vector>
  +++ |+#include <iostream>
    4 | using namespace std;
a.cc:9:5: error: 'cout' was not declared in this scope
    9 |     cout << H*W-  h*w;
      |     ^~~~
a.cc:9:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include<stdio.h>
#include<algorithm>
using namespace std;
  
int main(){
  int H,W,h,w;
  scanf("%d%d%d%d",&H,&W,&h,%w);
  printf("%d\n",(H-h)*(W-w));
  return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:29: error: expected primary-expression before '%' token
    7 |   scanf("%d%d%d%d",&H,&W,&h,%w);
      |                             ^
Language: C++

#include<stdio.h>
#include<algorithm>
using namespace std;
it H,W,h,w;
int main(){
  scanf("%d%d%d%d",&H,&W,&h,&w);
  printf("%d\n",(H-h)*(W-w));
}

Compiler output:
a.cc:4:1: error: 'it' does not name a type; did you mean 'int'?
    4 | it H,W,h,w;
      | ^~
      | int
a.cc: In function 'int main()':
a.cc:6:21: error: 'H' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,&w);
      |                     ^
a.cc:6:24: error: 'W' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,&w);
      |                        ^
a.cc:6:27: error: 'h' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,&w);
      |                           ^
a.cc:6:30: error: 'w' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,&w);
      |                              ^
Language: C++

#include<stdio.h>
#include<algorithm>
using namespace std;
it H,W,h,w;
int main(){
  scanf("%d%d%d%d",&H,&W,&h,%w);
  printf("%d\n",(H-h)*(W-w));
}

Compiler output:
a.cc:4:1: error: 'it' does not name a type; did you mean 'int'?
    4 | it H,W,h,w;
      | ^~
      | int
a.cc: In function 'int main()':
a.cc:6:21: error: 'H' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,%w);
      |                     ^
a.cc:6:24: error: 'W' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,%w);
      |                        ^
a.cc:6:27: error: 'h' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,%w);
      |                           ^
a.cc:6:29: error: expected primary-expression before '%' token
    6 |   scanf("%d%d%d%d",&H,&W,&h,%w);
      |                             ^
a.cc:6:30: error: 'w' was not declared in this scope
    6 |   scanf("%d%d%d%d",&H,&W,&h,%w);
      |                              ^
Language: C++

#include<bits/stdc++.h>

int main(){
  int a, b, c, d;
  cin >> a >> b;
  cin >> c >> d;
  cout << (a-c)*(b-d) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> a >> b;
      |   ^~~
      |   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:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout << (a-c)*(b-d) << 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:7:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |   cout << (a-c)*(b-d) << 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: Java

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int height, width, black_height, black_width, area;
    height = Double.parseDouble(sc.next());
    width = Double.parseDouble(sc.next());
    black_height = Double.parseDouble(sc.next());
    black_width = Double.parseDouble(sc.next());
    area = (height - black_height) * (width - black_width);
    System.out.println(area);
  }
}


Compiler output:
Main.java:7: error: incompatible types: possible lossy conversion from double to int
    height = Double.parseDouble(sc.next());
                               ^
Main.java:8: error: incompatible types: possible lossy conversion from double to int
    width = Double.parseDouble(sc.next());
                              ^
Main.java:9: error: incompatible types: possible lossy conversion from double to int
    black_height = Double.parseDouble(sc.next());
                                     ^
Main.java:10: error: incompatible types: possible lossy conversion from double to int
    black_width = Double.parseDouble(sc.next());
                                    ^
4 errors
Language: C++

#include <iostream>
using namespace std;

int main()
{
  int H,W,h,w;
  cin >> H >> W;
  cin >> h >> w;
  cout << H*W - (h*W + w*H - h*w) << endl;
  
  return 0:
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: expected ';' before ':' token
   11 |   return 0:
      |           ^
      |           ;
a.cc:11:11: error: expected primary-expression before ':' token
Language: C++

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

int main(){
  int H,W;
  cin>>H>>W;
  int h,w;
  cin>>h>>w;
  int ans=0;
  ans=H*W-h*W-w*H+hw;
  cout<<ans<<endl;

  

  
}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: 'hw' was not declared in this scope; did you mean 'w'?
   10 |   ans=H*W-h*W-w*H+hw;
      |                   ^~
      |                   w
Language: C++

#include <iostream>
#include <vector>
#include <numeric>
#include <algorithm>a

int main() {
  std::size_t n, m;
  std::cin >> n >> m;

  std::vector<std::size_t> a(n);
  std::vector<std::size_t> b(n);
  std::vector<std::size_t> id(n);
  for (std::size_t i = 0; i < n; ++i) std::cin >> a[i] >> b[i];
  std::iota(id.begin(), id.end(), (std::size_t)0);
 
  std::sort(id.begin(), id.end(), [&a,&b](auto i, auto j) { return a[i] < a[j]; });

  std::size_t cost = 0;
  std::size_t num = 0;
  for (auto&& i : id) {
    if (num + b[i] < m) {
      cost += a[i]*b[i];
      num += b[i];
    } else {
      cost += (m - num)*b[i];
      num = m;
      break;
    }
  }
  std::cout << cost << std::endl;
}

Compiler output:
a.cc:4:10: fatal error: algorithm>: No such file or directory
    4 | #include <algorithm>a
      |          ^~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
using namespace std;
int H;
int W;
int h;
int w;
int Sougou;
int ans;
int Kuro
int main(){
  cin >> H;
  cin >> W;
  cin >> h;
  cin >> w;
  Sougou =H*W;
  Kuro=h*W+w*H-h*w;
  ans=Sougou-Kuro;
  cout << ans <<endl;
  }
  
  

Compiler output:
a.cc:10:1: error: expected initializer before 'int'
   10 | int main(){
      | ^~~
Language: C++

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

int main() {
	int n = 0;
	int m = 0;
	int c = 0;
	int seki = 0;
	int ans = 0;
	cin >> n >> m >> c;
	vector<int>B(m);
	for (int i = 0; i < m; i++) {
		cin >> B[i];
	}
	vector<vector<int>>A(n,vector<int>(m));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> A[i][j];
		}
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			seki += B[j] * A[j];
		}
		if (seki + c > 0) {
			ans +=1 ;
		}
	}
	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:38: error: no match for 'operator*' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> >, std::vector<int> >::value_type' {aka 'std::vector<int>'})
   24 |                         seki += B[j] * A[j];
Language: Java

import java.util.*;
public class Main{
	public static void main(String args[]){
    	Scanner sc=new Scanner(System.in);
    	int H=sc.nextint();
    	int W=sc.nextInt();
    	int h=sc.nextInt();
    	int w=sc.nextInt();
    	int result;
    	result=H*W-h*W-w*H+h*w;
    	System.out.println(result);
    }
}

Compiler output:
Main.java:5: error: cannot find symbol
    	int H=sc.nextint();
    	        ^
  symbol:   method nextint()
  location: variable sc of type Scanner
1 error
Language: C++

#include <iostream>
using namespace std;
int main(){
  int H, W, h, w;
  cin >> H >> W >> h >> w;
  cout <<(H-h)(W-w);
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: expression cannot be used as a function
    6 |   cout <<(H-h)(W-w);
      |          ~~~~~^~~~~
Language: C++

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

int main(){
  int H,M;
  cin >> H >> W;
  int h,w;
  cin >> h >> w;
  int ans =(H-h)*(W-w);
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: 'W' was not declared in this scope
    6 |   cin >> H >> W;
      |               ^
Language: C++

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

int main(){
  int H,M;
  cin >> H >> M;
  int h,w;
  cin >> h >> w;
  int ans =(H-h)*(W-w);
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: 'W' was not declared in this scope
    9 |   int ans =(H-h)*(W-w);
      |                   ^
Language: C++

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

int main(){
  int H,M;
  cin >> H >> M;
  int h,w;
  cin >> h >> w;
  int ans =(H-h)*(W-w);
  cout << ans << endl;
}

Compiler output:
a.cc:2:17: error: 'stdc' is not a namespace-name
    2 | using namespace stdc;
      |                 ^~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> H >> M;
      |   ^~~
      |   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:9:19: error: 'W' was not declared in this scope
    9 |   int ans =(H-h)*(W-w);
      |                   ^
a.cc:10:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |   cout << ans << 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:10:18: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 |   cout << ans << 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)
      |     ^~~~