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

#include<stdio.h>

int merge(int A[], int left, int mid, int right)
{
	int n1=mid-left;
	int n2=right-mid;
	int i,j,k,count=0;
	int L[250001];
	int R[250001];
	
	for(i=0;i<=n1-1;i++) L[i]=A[left+i];
	for(i=0;i<=n2-1;i++) R[i]=A[mid+i];
	L[n1]=1000000001;
	R[n2]=1000000001;
	i=0;
	j=0;
	for(k=left;k<=right-1;k++)
	{
		count++;
		if(L[i]<=R[j])
		{
			A[k]=L[i];
			i++;
		}
		else
		{
			A[k]=R[j];
			j++;
		}
	}
}

int mergeSort(int A[], int left, int right)
{
	int mid;
	if(left+1<right)
	{
		mid=(left+right)/2;
		mergeSort(A,left,mid);
		mergeSort(A,mid,right);
		merge(A,left,mid,right);
	}
}

int main(void)
{
	int i,n;
	int S[500000];
	
	scanf("%d",&n);
	for(i=0;i<=n-1;i++) scanf("%d",&S[i]);
	mergeSort(S,0,n);
	for(i=0;i<=n-1;i++)
	{
		if(i) printf(" ");
		printf("%d",S[i]);
	}
	printf("\n%d\n",count);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:58:25: error: 'count' undeclared (first use in this function)
   58 |         printf("\n%d\n",count);
      |                         ^~~~~
main.c:58:25: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <iostream>
/* C++のstdio.hみたいなもの
cin (scanf), cout (printf) のためにincludeします。
*/

using namespace std;
/* 名前空間にstdを指定する。毎回、
std::cin , std::cout と記述するのはうっとおしいので省略するため。
*/


#define MAX 500000
#define SENTINEL 2000000000

int L[MAX/2+2], R[MAX/2+2];
int cnt;

void merge(int A[],int n,int left, int mid, int right) {
  int n1 = mid -left;
  int n2 = right - mid;
// C++forループ専用のint型を宣言できる
// ループの中のみ有効なので安全
  for(int i=0;i<n1;i++) L[i] = A[left + i];
  for(int i=0;i<n2;i++) R[i] = A[mid + i];
  L[n1] = R[n2] = SENTINEL;
  int i=0, j=0;
  for(int k=left; k<right; k++) {
    cnt++;
    if(L[i]<=R[j]) {
      A[k] = L[i++];
    } else {
      A[k] = R[j++];
    }
  }
}

void mergeSort(int A[],int n,int left,int right) {
  if(left+1 < right) {
    int mid = (left+right) / 2;
    mergeSort(A,n,left,mid);
    mergeSort(A,n,mid, right);
    merge(A,n,left,mid,right);
  }
}

int main(void) {
  int A[MAX], n, i;
  cnt = 0;

	cin >> n; // scanf("%d",&n);
  for(i=0;i<n;i++) cin >> A[i];

  mergeSort(A, n, 0, n);
  for(i=0;i<n;i++) {
    if(i)cout << " ";
  	cout << A[i]; printf("%d",A[i]);
  }
  cout << endl; // endlは改行

  cout << cnt << endl; // printf("\n");

  return 0;
}

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

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

void merge(int a[],int left,int mid,int right,int ans)
{
 int i,j,k,l[250000],r[250000],n1,n2;

 n1=mid-left;
 n2=right-mid;

 for(i=0;i<n1;i++){
  l[i]=a[left+i];
 }
 for(i=0;i<n2;i++){
  r[i]=a[mid+i];
 }

 l[n1]=INT_MAX;
 r[n2]=INT_MAX;
 i=0;
 j=0;

 for(k=left;k<right;k++){
  ans++;
  if(l[i]<=r[j]{
   a[k]=l[i];
   i++;
  }else{
   a[k]=r[j];
   j++;
  }
 }
}

void mergeSort(int a[],int left,int right,int ans)
{
 int mid;

 if(left+1<right){
  mid=(left+right)/2;
  mergeSort(a,left,mid,ans);
  mergeSort(a,mid,right,ans);
  merge(a,left,mid,right,ans);
 }
}

int main(void)
{
 int i,n,ans=0,a[500000];

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

 mergeSort(a,0,n,ans);

 for(i=0;i<n-1;i++){
  printf("%d ",a[i]);
 }
 printf("%d\n",a[n-1]);
 printf("%d\n",ans);

 return 0;
}

Compiler output:
main.c: In function 'merge':
main.c:25:16: error: expected ')' before '{' token
   25 |   if(l[i]<=r[j]{
      |     ~          ^
      |                )
main.c:32:2: error: expected expression before '}' token
   32 |  }
      |  ^
Language: C

#include<stdio.h>

void merge(int s[500000],int left,int mid, int right){
  int i,j,k,n1,n2,L[250002],R[250002];
  n1 = mid - left;
  n2 = right - mid:
  for (i=0;i<n1;i++) L[i]=s[left+i];
  for (i=0;i<n2;i++) R[i]=s[i+mid];
  L[n1]=10000000000;
  R[n2]=10000000000;
  i=0;
  j=0;
  for (k=left;k < right-1; k++)
    if(L[i]<= R[j]){
      s[k]=L[i];
      i++;
    } else {
      s[k]=R[j]
      j++;
    }
}

void mergeSort(int s[500000],int left, int right) {
  if (left+ 1 < right)
    mid = (left + right)/2;
    mergeSort(s,left,mid);
    mergeSort(s,mid,right);
    mergeSort(s,left,mid,right);
}

int main() {
  int n,i,s[500000];
  scanf("%d",&n);
  for(i = 0; i< n;i++)
    scanf("%d",&s[i]);
  mergeSort(s,0,n);
  for(i=0;i<n;i++)
    printf("%d ",s[i]);
  printf("%d\n",s[n-1]);
  return 0;
}

Compiler output:
main.c: In function 'merge':
main.c:6:19: error: expected ';' before ':' token
    6 |   n2 = right - mid:
      |                   ^
      |                   ;
main.c:9:9: warning: overflow in conversion from 'long int' to 'int' changes value from '10000000000' to '1410065408' [-Woverflow]
    9 |   L[n1]=10000000000;
      |         ^~~~~~~~~~~
main.c:10:9: warning: overflow in conversion from 'long int' to 'int' changes value from '10000000000' to '1410065408' [-Woverflow]
   10 |   R[n2]=10000000000;
      |         ^~~~~~~~~~~
main.c:18:16: error: expected ';' before 'j'
   18 |       s[k]=R[j]
      |                ^
      |                ;
   19 |       j++;
      |       ~         
main.c: In function 'mergeSort':
main.c:25:5: error: 'mid' undeclared (first use in this function)
   25 |     mid = (left + right)/2;
      |     ^~~
main.c:25:5: note: each undeclared identifier is reported only once for each function it appears in
main.c:28:5: error: too many arguments to function 'mergeSort'
   28 |     mergeSort(s,left,mid,right);
      |     ^~~~~~~~~
main.c:23:6: note: declared here
   23 | void mergeSort(int s[500000],int left, int right) {
      |      ^~~~~~~~~
Language: C

#include<stdio.h>

void merge(int *a, int left, int mid, int right, int *c){
   int n1, n2, i, j, k;
   int L[500000] = {1000000000};
   int R[500000] = {1000000000}};

   n1 = mid - left;
   n2 = right - mid;

   for(i = 0; i < n1; i++){
      L[i] = a[left + i];
   }
   for(i = 0; i < n2; i++){
      R[i] = a[mid + i];
   }

   i = 0;
   j = 0;

   for(k = left; k < right; k++){
      if(L[i] <= R[j]){
         a[k] = L[i];
         i++;
      }else{
         a[k] = R[j];
         j++;
      }
   }
   c++;

}





void mergeSort(int *a, int left, int right, int *c){

   if(left + 1 < right){
      mid = (left + right) / 2;
      mergeSort(a, left, mid, c);
      mergeSort(a, mid, right, c);
      merge(a, left, mid, right, c);
   }

}

int main (){
   int n, i, count;
   int s[500000] = {0};

   scanf("%d", &n);

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

   mergeSort(s, 0, n-1, count);

   for(i = 0; i < n; i++){
      if(i)
         printf(" ");
      printf("%d", s[i]);
   }
   printf("\n%d\n", count);

   return 0;

}

Compiler output:
main.c: In function 'merge':
main.c:6:32: error: expected ',' or ';' before '}' token
    6 |    int R[500000] = {1000000000}};
      |                                ^
main.c: In function 'mergeSort':
main.c:41:7: error: 'mid' undeclared (first use in this function)
   41 |       mid = (left + right) / 2;
      |       ^~~
main.c:41:7: note: each undeclared identifier is reported only once for each function it appears in
main.c: In function 'main':
main.c:56:20: error: 'a' undeclared (first use in this function)
   56 |       scanf("%d", &a[i]);
      |                    ^
main.c:59:25: error: passing argument 4 of 'mergeSort' makes pointer from integer without a cast [-Wint-conversion]
   59 |    mergeSort(s, 0, n-1, count);
      |                         ^~~~~
      |                         |
      |                         int
main.c:38:50: note: expected 'int *' but argument is of type 'int'
   38 | void mergeSort(int *a, int left, int right, int *c){
      |                                             ~~~~~^
Language: C

#include<stdio.h>

void merge(int *a, int left, int mid, int right, int *c){
   int n1, n2, i, j, k;
   int L[500000] = {1000000000};
   int R[500000] = {1000000000};

   n1 = mid - left;
   n2 = right - mid;

   for(i = 0; i < n1; i++){
      L[i] = a[left + i];
   }
   for(i = 0; i < n2; i++){
      R[i] = a[mid + i];
   }

   i = 0;
   j = 0;

   for(k = left; k < right; k++){
      if(L[i] <= R[j]){
         a[k] = L[i];
         i++;
      }else{
         a[k] = R[j];
         j++;
      }
   }
   c++;

}





void mergeSort(int *a, int left, int right, int *c){

   if(left + 1 < right){
      mid = (left + right) / 2;
      mergeSort(a, left, mid, c);
      mergeSort(a, mid, right, c);
      merge(a, left, mid, right, c);
   }

}

int main (){
   int n, i, count;
   int s[500000] = {0};

   scanf("%d", &n);

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

   mergeSort(s, 0, n-1, count);

   for(i = 0; i < n; i++){
      if(i)
         printf(" ");
      printf("%d", s[i]);
   }
   printf("\n%d\n", count);

   return 0;

}

Compiler output:
main.c: In function 'mergeSort':
main.c:41:7: error: 'mid' undeclared (first use in this function)
   41 |       mid = (left + right) / 2;
      |       ^~~
main.c:41:7: note: each undeclared identifier is reported only once for each function it appears in
main.c: In function 'main':
main.c:56:20: error: 'a' undeclared (first use in this function)
   56 |       scanf("%d", &a[i]);
      |                    ^
main.c:59:25: error: passing argument 4 of 'mergeSort' makes pointer from integer without a cast [-Wint-conversion]
   59 |    mergeSort(s, 0, n-1, count);
      |                         ^~~~~
      |                         |
      |                         int
main.c:38:50: note: expected 'int *' but argument is of type 'int'
   38 | void mergeSort(int *a, int left, int right, int *c){
      |                                             ~~~~~^
Language: C

#include <stdio.h>

int n, s[500000];
int a = 0;

void merge(int left, int mid, int right)
{
   int n1 = mid - left;
   int n2 = right - mid;
   int L[n1+1], R[n2+1];
   int i, j, k;

   for ( i = 0; i < n1; i++ )
      L[i] = s[left+i];

   for ( i = 0; i < n2; i++ )
      R[i] = s[mid+i];
      L[n1] = 1000000000;
      R[n2] = 1000000000;

   i = 0;
   j = 0;

   for ( k = left; k < right; k++ ) {
      a++;

      if( L[i] <= R[j] )
         s[k] = L[i++];
      else
         s[k] = R[j++];

   }

}


void MergeSort(int left, int right)
{
   int mid;

   if( right -left <= 1 )
      return;

   mid = (left+right) / 2;
   MergeSort(left, mid);
   MergeSort(mid, right);
   Merge(left, mid, right);

}


int main()
{
   int i, left, right;

   scanf("%d", &n);

   for ( i = 0; i < n; i++ )
      scanf("%d", &s[i]);

   left = 0;
   right = n;
   MergeSort(left, right);

   for ( i = 0; i < n; i++ ){
      if( i > 0 )
         printf(" ");
         printf("%d", s[i]);
   }

   printf("%d\n", a);

   return 0;

}

Compiler output:
main.c: In function 'MergeSort':
main.c:47:4: error: implicit declaration of function 'Merge'; did you mean 'merge'? [-Wimplicit-function-declaration]
   47 |    Merge(left, mid, right);
      |    ^~~~~
      |    merge
Language: C

#include <stdio.h>

#define max 500000
#define sentinel 200000000000

int L[max/2 + 2];
int R[max/2 + 2];
int count;



int merge(int A[], int n, int left, int mid, int right)  {
  int i, n1, n2;
  n1 = mid - left;
  n2 = right - mid;
  
  for (i = 0; i < n1; i++)
    L[i] = A[left+i];
  for (i = 0; i < n2; i++)
    R[i] = A[mid+i];
  
  L[n1] = R[n2] = sentinal;
  
  int i = j = 0;
  for ( k = left; k < right; k++)  {
    count++;
  if ( L[i] <= R[j])  
    A[k] = L[i++];
  else 
    A[k] = R[j++];
}

void mergeSort(int A[], int n, int left, int right)  {
  int mid;
  if (left + 1 < right)  {
    mid = (left+right) / 2;
    mergeSort(A, n, left, mid);
    mergeSort(A, n, mid, right);
    mergeSort(A, n, left, mid, right);
  }
}

int main(void)  {
  int A[max], n, i;
  count = 0;
  
  scanf("%d", &n);
  for (i = 0; i < n; i++) 
    scanf("%d", &A[i]);
  
  mergeSort(A, n, 0, n);

  for (i = 0; i < n; i++)  {
    if (i)
      printf(" ");
    printf("%d", A[i]);
  }
  printf("\n");
  printf("%d\n", count);
  
  return 0;
}

}
 
  
  

Compiler output:
main.c: In function 'merge':
main.c:22:19: error: 'sentinal' undeclared (first use in this function); did you mean 'sentinel'?
   22 |   L[n1] = R[n2] = sentinal;
      |                   ^~~~~~~~
      |                   sentinel
main.c:22:19: note: each undeclared identifier is reported only once for each function it appears in
main.c:24:7: error: redeclaration of 'i' with no linkage
   24 |   int i = j = 0;
      |       ^
main.c:13:7: note: previous declaration of 'i' with type 'int'
   13 |   int i, n1, n2;
      |       ^
main.c:24:11: error: 'j' undeclared (first use in this function)
   24 |   int i = j = 0;
      |           ^
main.c:25:9: error: 'k' undeclared (first use in this function)
   25 |   for ( k = left; k < right; k++)  {
      |         ^
main.c: In function 'mergeSort':
main.c:39:5: error: too many arguments to function 'mergeSort'
   39 |     mergeSort(A, n, left, mid, right);
      |     ^~~~~~~~~
main.c:33:6: note: declared here
   33 | void mergeSort(int A[], int n, int left, int right)  {
      |      ^~~~~~~~~
Language: C

#include <stdio.h>

#define max 500000
#define sentinel 200000000000

int L[max/2 + 2];
int R[max/2 + 2];
int count;



int merge(int A[], int n, int left, int mid, int right)  {
  int i, n1, n2;
  n1 = mid - left;
  n2 = right - mid;
  
  for (i = 0; i < n1; i++)
    L[i] = A[left+i];
  for (i = 0; i < n2; i++)
    R[i] = A[mid+i];
  
  L[n1] = R[n2] = sentinel;
  
  i = j = 0;
  for ( k = left; k < right; k++)  {
    count++;
  if ( L[i] <= R[j])  
    A[k] = L[i++];
  else 
    A[k] = R[j++];
}

void mergeSort(int A[], int n, int left, int right)  {
  int mid;
  if (left + 1 < right)  {
    mid = (left+right) / 2;
    mergeSort(A, n, left, mid);
    mergeSort(A, n, mid, right);
    mergeSort(A, n, left, mid, right);
  }
}

int main(void)  {
  int A[max], n, i;
  count = 0;
  
  scanf("%d", &n);
  for (i = 0; i < n; i++) 
    scanf("%d", &A[i]);
  
  mergeSort(A, n, 0, n);

  for (i = 0; i < n; i++)  {
    if (i)
      printf(" ");
    printf("%d", A[i]);
  }
  printf("\n");
  printf("%d\n", count);
  
  return 0;
}

}
 
  
  

Compiler output:
main.c: In function 'merge':
main.c:4:18: warning: overflow in conversion from 'long int' to 'int' changes value from '200000000000' to '-1863462912' [-Woverflow]
    4 | #define sentinel 200000000000
      |                  ^~~~~~~~~~~~
main.c:22:19: note: in expansion of macro 'sentinel'
   22 |   L[n1] = R[n2] = sentinel;
      |                   ^~~~~~~~
main.c:24:7: error: 'j' undeclared (first use in this function)
   24 |   i = j = 0;
      |       ^
main.c:24:7: note: each undeclared identifier is reported only once for each function it appears in
main.c:25:9: error: 'k' undeclared (first use in this function)
   25 |   for ( k = left; k < right; k++)  {
      |         ^
main.c: In function 'mergeSort':
main.c:39:5: error: too many arguments to function 'mergeSort'
   39 |     mergeSort(A, n, left, mid, right);
      |     ^~~~~~~~~
main.c:33:6: note: declared here
   33 | void mergeSort(int A[], int n, int left, int right)  {
      |      ^~~~~~~~~
Language: C

#include <stdio.h>

#define max 500000
#define sentinel 200000000000

int L[max/2 + 2];
int R[max/2 + 2];
int count;



int merge(int A[], int n, int left, int mid, int right)  {
  int i, j, k, n1, n2;
  n1 = mid - left;
  n2 = right - mid;
  
  for (i = 0; i < n1; i++)
    L[i] = A[left+i];
  for (i = 0; i < n2; i++)
    R[i] = A[mid+i];
  
  L[n1] = R[n2] = sentinel;
  
  i = j = 0;
  for ( k = left; k < right; k++)  {
    count++;
  if ( L[i] <= R[j])  
    A[k] = L[i++];
  else 
    A[k] = R[j++];
}

void mergeSort(int A[], int n, int left, int right)  {
  int mid;
  if (left + 1 < right)  {
    mid = (left+right) / 2;
    mergeSort(A, n, left, mid);
    mergeSort(A, n, mid, right);
    merge(A, n, left, mid, right);
  }
}

int main(void)  {
  int A[max], n, i;
  count = 0;
  
  scanf("%d", &n);
  for (i = 0; i < n; i++) 
    scanf("%d", &A[i]);
  
  mergeSort(A, n, 0, n);

  for (i = 0; i < n; i++)  {
    if (i)
      printf(" ");
    printf("%d", A[i]);
  }
  printf("\n");
  printf("%d\n", count);
  
  return 0;
}

}
 
  
  

Compiler output:
main.c: In function 'merge':
main.c:4:18: warning: overflow in conversion from 'long int' to 'int' changes value from '200000000000' to '-1863462912' [-Woverflow]
    4 | #define sentinel 200000000000
      |                  ^~~~~~~~~~~~
main.c:22:19: note: in expansion of macro 'sentinel'
   22 |   L[n1] = R[n2] = sentinel;
      |                   ^~~~~~~~
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C

#include <stdio.h>

#define max 500000
#define sentinel 200000000000

int L[max/2 + 2];
int R[max/2 + 2];
int count;



int merge(int A[], int n, int left, int mid, int right)  {
  int i, j, k, n1, n2;
  n1 = mid - left;
  n2 = right - mid;
  
  for (i = 0; i < n1; i++)
    L[i] = A[left+i];
  for (i = 0; i < n2; i++)
    R[i] = A[mid+i];
  
  L[n1] = R[n2] = sentinel;
  
  i = j = 0;
  for ( k = left; k < right; k++)  {
    count++;
  if ( L[i] <= R[j])  
    A[k] = L[i++];
  else 
    A[k] = R[j++];
}

void mergeSort(int A[], int n, int left, int right)  {
  int mid;
  if (left + 1 < right)  {
    mid = (left+right) / 2;
    mergeSort(A, n, left, mid);
    mergeSort(A, n, mid, right);
    merge(A, n, left, mid, right);
  }
}

int main(void)  {
  int A[max], n, i;
  count = 0;
  
  scanf("%d", &n);
  for (i = 0; i < n; i++) 
    scanf("%d", &A[i]);
  
  mergeSort(A, n, 0, n);

  for (i = 0; i < n; i++)  {
    if (i)
      printf(" ");
    printf("%d", A[i]);
  }
  printf("\n");
  printf("%d\n", count);
  
  return 0;
}


 
  
  

Compiler output:
main.c: In function 'merge':
main.c:4:18: warning: overflow in conversion from 'long int' to 'int' changes value from '200000000000' to '-1863462912' [-Woverflow]
    4 | #define sentinel 200000000000
      |                  ^~~~~~~~~~~~
main.c:22:19: note: in expansion of macro 'sentinel'
   22 |   L[n1] = R[n2] = sentinel;
      |                   ^~~~~~~~
main.c:62:1: error: expected declaration or statement at end of input
   62 | }
      | ^
Language: C

#include<iostream>
using namespace std;
#define MAX 500000
#define SENTINEL 2000000000

int L[MAX/2+2],R[MAX/2+2];
int cnt;

void merge(int A[],int n,int left,int mid,int right){
 int n1 = mid - left;
 int n2 = right - mid;
 for(int i = 0; i < n1; i++)
 L[i] = A[left + i];
 for(int i = 0; i < n2; i++)
 R[i] = A[mid + i];
 L[n1] = R[n2] = SENTINEL;
 int i = 0, j = 0;
 for (int k = left; k <right; K++){
  cnt++;
 if(L[i] <= R[j]){
  A[k] = L[i++];
} else{
  A[k] = R[j++];
 }
}
}
 void mergeSort(int A[],int n,int left,int right){
 if(left+1 < right){
 int mid = (left + right) / 2;
 mergeSort(A,n,left,mid);
 mergeSort(A,n,,mid,right);
 mergeSort(A,n,left,mid,right);
 }
}
  
 int main(){
  int A[MAX],n,i;
  cnt = 0;

  cin >> n;
  for(i = 0; i < n; i++){
  if(i) cout << " ";
  cout <<A[i];
}
  cout << endl;

  cout << cnt << endl;

  return 0;
}

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

#include<stdio.h>
using namespace std;
#define MAX 500000
#define SENTINEL 2000000000

int L[MAX/2+2],R[MAX/2+2];
int cnt;

void merge(int A[],int n,int left,int mid,int right){
 int n1 = mid - left;
 int n2 = right - mid;
 for(int i = 0; i < n1; i++)
 L[i] = A[left + i];
 for(int i = 0; i < n2; i++)
 R[i] = A[mid + i];
 L[n1] = R[n2] = SENTINEL;
 int i = 0, j = 0;
 for (int k = left; k <right; K++){
  cnt++;
 if(L[i] <= R[j]){
  A[k] = L[i++];
} else{
  A[k] = R[j++];
 }
}
}
 void mergeSort(int A[],int n,int left,int right){
 if(left+1 < right){
 int mid = (left + right) / 2;
 mergeSort(A,n,left,mid);
 mergeSort(A,n,,mid,right);
 mergeSort(A,n,left,mid,right);
 }
}
  
 int main(){
  int A[MAX],n,i;
  cnt = 0;

  cin >> n;
  for(i = 0; i < n; i++){
  if(i) cout << " ";
  cout <<A[i];
}
  cout << endl;

  cout << cnt << endl;

  return 0;
}

Compiler output:
main.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
main.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~
main.c: In function 'merge':
main.c:18:31: error: 'K' undeclared (first use in this function)
   18 |  for (int k = left; k <right; K++){
      |                               ^
main.c:18:31: note: each undeclared identifier is reported only once for each function it appears in
main.c: In function 'mergeSort':
main.c:31:16: error: expected expression before ',' token
   31 |  mergeSort(A,n,,mid,right);
      |                ^
main.c:31:2: error: too many arguments to function 'mergeSort'
   31 |  mergeSort(A,n,,mid,right);
      |  ^~~~~~~~~
main.c:27:7: note: declared here
   27 |  void mergeSort(int A[],int n,int left,int right){
      |       ^~~~~~~~~
main.c:32:2: error: too many arguments to function 'mergeSort'
   32 |  mergeSort(A,n,left,mid,right);
      |  ^~~~~~~~~
main.c:27:7: note: declared here
   27 |  void mergeSort(int A[],int n,int left,int right){
      |       ^~~~~~~~~
main.c: In function 'main':
main.c:40:3: error: 'cin' undeclared (first use in this function)
   40 |   cin >> n;
      |   ^~~
main.c:42:9: error: 'cout' undeclared (first use in this function)
   42 |   if(i) cout << " ";
      |         ^~~~
main.c:45:11: error: 'endl' undeclared (first use in this function)
   45 |   cout << endl;
      |           ^~~~
Language: C

#include <stdio.h>

#define MAX 500000
#define SENTINEL 2000000000

int L[ MAX / 2 + 2 ], R[ MAX / 2 + 2 ];
int wa;

void merge( int A[ ], int left, int mid, int right )
{
   int n1, n2;
   int i, j, k;

   n1 = mid -left;
   n2 = right - mid;

   for ( i = 0; i < n1; i++ ) {
      L[ i ] = A[ left + 1 ];
   }
   for ( i = 0; i < n2; i++ ) {
      R[ i ] = A[ mid + 1 ];
   }
   L[ n1 ] = R[ n2 ] = SENTINEL;
   i = 0;
   j = 0;
   for ( k = left; k < right; k++  ) {
      wa = wa + 1;
      if ( L[ i ] <= R[ j ] ) {
         A[ k ] = L[ i ];
         i = i + 1;
      } else {
      A [ k ] = R[ j ];
      j = j + 1;
      }
   }
}
{

void mergeSort( int A[ ], int left, int right )
{
   int mid;

   if ( left + 1 < right ) {
      mid = ( left + right ) / 2;
      mergeSort( A, left, mid );
      mergeSort( A, mid, right );
      merge( A, left, mid, right );
   }
}

int main()
{
   int n, i, A[ ];

   scanf("%d", &n);
   for ( i = 0; i < n; i++ ) {
      scanf("%d", A[ i ]);
   }

   mergeSort( A, 0, n );

   for ( i = 0; i < n; i++ ) {
      if ( i > 0 ) printf(" ");
      scanf("%d", &A[ i ]);
   }

   printf("%d?\n", wa);

   return 0;
}

Compiler output:
main.c:37:1: error: expected identifier or '(' before '{' token
   37 | {
      | ^
Language: C

#include <stdio.h>

#define MAX 500000
#define SENTINEL 2000000000

int L[ MAX / 2 + 2 ], R[ MAX / 2 + 2 ];
int wa;

void merge( int A[ ], int left, int mid, int right )
{
   int n1, n2;
   int i, j, k;

   n1 = mid -left;
   n2 = right - mid;

   for ( i = 0; i < n1; i++ ) {
      L[ i ] = A[ left + 1 ];
   }
   for ( i = 0; i < n2; i++ ) {
      R[ i ] = A[ mid + 1 ];
   }
   L[ n1 ] = R[ n2 ] = SENTINEL;
   i = 0;
   j = 0;
   for ( k = left; k < right; k++  ) {
      wa = wa + 1;
      if ( L[ i ] <= R[ j ] ) {
         A[ k ] = L[ i ];
         i = i + 1;
      } else {
      A [ k ] = R[ j ];
      j = j + 1;
      }
   }
}


void mergeSort( int A[ ], int left, int right )
{
   int mid;

   if ( left + 1 < right ) {
      mid = ( left + right ) / 2;
      mergeSort( A, left, mid );
      mergeSort( A, mid, right );
      merge( A, left, mid, right );
   }
}

int main()
{
   int n, i, A[ ];

   scanf("%d", &n);
   for ( i = 0; i < n; i++ ) {
      scanf("%d", A[ i ]);
   }

   mergeSort( A, 0, n );

   for ( i = 0; i < n; i++ ) {
      if ( i > 0 ) printf(" ");
      scanf("%d", &A[ i ]);
   }

   printf("%d?\n", wa);

   return 0;
}

Compiler output:
main.c: In function 'main':
main.c:53:14: error: array size missing in 'A'
   53 |    int n, i, A[ ];
      |              ^
Language: C

#include <stdio.h>

#define MAX 500000
#define SENTINEL 2000000000

int L[ MAX / 2 + 2 ], R[ MAX / 2 + 2 ];
int wa;

void merge( int A[ ], int left, int mid, int right )
{
   int n1, n2;
   int i, j, k;

   n1 = mid -left;
   n2 = right - mid;

   for ( i = 0; i < n1; i++ ) {
      L[ i ] = A[ left + 1 ];
   }
   for ( i = 0; i < n2; i++ ) {
      R[ i ] = A[ mid + 1 ];
   }
   L[ n1 ] = R[ n2 ] = SENTINEL;
   i = 0;
   j = 0;
   for ( k = left; k < right; k++  ) {
      wa = wa + 1;
      if ( L[ i ] <= R[ j ] ) {
         A[ k ] = L[ i ];
         i = i + 1;
      } else {
      A [ k ] = R[ j ];
      j = j + 1;
      }
   }
}


void mergeSort( int A[ ], int left, int right )
{
   int mid;

   if ( left + 1 < right ) {
      mid = ( left + right ) / 2;
      mergeSort( A, left, mid );
      mergeSort( A, mid, right );
      merge( A, left, mid, right );
   }
}

int main()
{
   int n, i, A[ ];

   scanf("%d", &n);
   for ( i = 0; i < n; i++ ) {
      scanf("%d", A[ i ]);
   }

   mergeSort( A[ ], 0, n );

   for ( i = 0; i < n; i++ ) {
      if ( i > 0 ) printf(" ");
      scanf("%d", &A[ i ]);
   }

   printf("%d?\n", wa);

   return 0;
}

Compiler output:
main.c: In function 'main':
main.c:53:14: error: array size missing in 'A'
   53 |    int n, i, A[ ];
      |              ^
main.c:60:18: error: expected expression before ']' token
   60 |    mergeSort( A[ ], 0, n );
      |                  ^
Language: C

#include <stdio.h>
#define MAX 500000
#define SENTINEL 2000000000

int L[MAX/2+2],R[MAX/2+2];
int cnt;

int merge(int a[],int n,int left,int mid,int right){
  int n1,n2,i,j,k;
  n1=mid-left;
  n2=right-mid;
  for(i=0;i<n1;i++){
    L[i]=a[left+i];
  }
  for(i=0;i<n2;i++){
    R[i]=a[mid+i];
  }
  L[n1]=R[n2]=SENTINEL;
  i=0;
  j=0;
  for(k=left;k<right;k++){
    cnt++;
    if(L[i]<R[j]){
      a[k]=L[i++];
    }
    else{
      a[k]=R[j++];
    }
  }
}

int mergesort(int a[],int n,int left,int right){
  int mid;
  if(left+1<right){
    mid=(reft+right)/2;
    mergesort(a,n,left,mid);
    mergesort(a,n,mid,right);
    mergesort(a,n,left,mid,right);
  }
}

int main(void)
{
  int a[MAX],n,i,cnt;
  cnt=0;

  scanf("%d",&n);
  for(i=0;i<n;i++){
    scanf("%d",&a[i]);
  }
  mergesort(a,n,0,n);
  
  for(i=0;i<n;i++){
    if(i>0){
      printf(" ");
    }
    printf("%d",a[i]);
  }
  printf("\n");
  printf("%d\n",cnt);
  
  return 0;
}

Compiler output:
main.c: In function 'mergesort':
main.c:35:10: error: 'reft' undeclared (first use in this function); did you mean 'left'?
   35 |     mid=(reft+right)/2;
      |          ^~~~
      |          left
main.c:35:10: note: each undeclared identifier is reported only once for each function it appears in
main.c:38:5: error: too many arguments to function 'mergesort'
   38 |     mergesort(a,n,left,mid,right);
      |     ^~~~~~~~~
main.c:32:5: note: declared here
   32 | int mergesort(int a[],int n,int left,int right){
      |     ^~~~~~~~~
Language: C

#include <stdio.h>
#define MAX 500000
#define SENTINEL 2000000000

int L[MAX/2+2],R[MAX/2+2];
int cnt;

int merge(int a[],int n,int left,int mid,int right){
  int n1,n2,i,j,k;
  n1=mid-left;
  n2=right-mid;
  for(i=0;i<n1;i++){
    L[i]=a[left+i];
  }
  for(i=0;i<n2;i++){
    R[i]=a[mid+i];
  }
  L[n1]=R[n2]=SENTINEL;
  i=0;
  j=0;
  for(k=left;k<right;k++){
    cnt++;
    if(L[i]<R[j]){
      a[k]=L[i++];
    }
    else{
      a[k]=R[j++];
    }
  }
}

int mergesort(int a[],int n,int left,int right){
  int mid;
  if(left+1<right){
    mid=(left+right)/2;
    mergesort(a,n,left,mid);
    mergesort(a,n,mid,right);
    mergesort(a,n,left,mid,right);
  }
}

int main(void)
{
  int a[MAX],n,i,cnt;
  cnt=0;

  scanf("%d",&n);
  for(i=0;i<n;i++){
    scanf("%d",&a[i]);
  }
  mergesort(a,n,0,n);
  
  for(i=0;i<n;i++){
    if(i>0){
      printf(" ");
    }
    printf("%d",a[i]);
  }
  printf("\n");
  printf("%d\n",cnt);
  
  return 0;
}

Compiler output:
main.c: In function 'mergesort':
main.c:38:5: error: too many arguments to function 'mergesort'
   38 |     mergesort(a,n,left,mid,right);
      |     ^~~~~~~~~
main.c:32:5: note: declared here
   32 | int mergesort(int a[],int n,int left,int right){
      |     ^~~~~~~~~
Language: C


#include <stdio.h>
??
#define max 500000
??
int L[250002];
int R[250002];

??
??
??
int merge(int S[], int n, int l, int m, int r)?? {
????int i, j, k;
????int n1 = m - l;
????int n2 = r - m;
??????
????for (i = 0; i < n1; i++)
????????L[i] = A[l+i];
????for (i = 0; i < n2; i++)
????????R[i] = A[m+i];
??????
????L[n1] = R[n2] = 500000000
??????
????i = j = 0;
????for ( k = l; k < r; k++)?? {
????????if ( L[i] <= R[j])?? {
????????????A[k] = L[i]; 
i++;
}
????????else{
????????????A[k] = R[j];
j++;
}
????}
}
??
void mergeSort(int S[], int n, int l, int r)?? {
????
????if (l + 1 < r)?? {
????????int m = (l+r) / 2;
????????mergeSort(S,n, l,m);
????????mergeSort(S, n,m,r);
????????merge(S,n, l,m,r);
????}
}
??
int main(void)?? {
????int S[max], n, i;
????c = 0;
??????
????scanf("%d", &n);
????for (i = 0; i < n; i++) 
????????scanf("%d", &S[i]);
??????
????mergeSort(S, n, 0, n);
??
????for (i = 0; i < n; i++)?? {
????????if(i==0){
??????printf("%d", S[i]);}
else if (i){
????????????printf(" ");
????????printf("%d", S[i]);}
????}
????
????printf("\n%d\n", c);
??????
????return 0;
}
??
??

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ??
      | ^
main.c:9:1: error: expected identifier or '(' before '?' token
    9 | ??
      | ^
main.c:36:1: error: expected identifier or '(' before '?' token
   36 | ??
      | ^
main.c:46:1: error: expected identifier or '(' before '?' token
   46 | ??
      | ^
main.c:69:1: error: expected identifier or '(' before '?' token
   69 | ??
      | ^
Language: C


#include <stdio.h>
??
#define max 500000
??
int L[250002];
int R[250002];

??
??
??
int merge(int S[], int n, int l, int m, int r)?? {
????int i, j, k;
????int n1 = m - l;
????int n2 = r - m;
??????
????for (i = 0; i < n1; i++)
????????L[i] = S[l+i];
????for (i = 0; i < n2; i++)
????????R[i] = S[m+i];
??????
????L[n1] = R[n2] = 500000000
??????
????i = j = 0;
????for ( k = l; k < r; k++)?? {
????????if ( L[i] <= R[j])?? {
????????????S[k] = L[i]; 
i++;
}
????????else{
????????????S[k] = R[j];
j++;
}
????}
}
??
void mergeSort(int S[], int n, int l, int r)?? {
????
????if (l + 1 < r)?? {
????????int m = (l+r) / 2;
????????mergeSort(S,n, l,m);
????????mergeSort(S, n,m,r);
????????merge(S,n, l,m,r);
????}
}
??
int main(void)?? {
????int S[max], n, i;
????c = 0;
??????
????scanf("%d", &n);
????for (i = 0; i < n; i++) 
????????scanf("%d", &S[i]);
??????
????mergeSort(S, n, 0, n);
??
????for (i = 0; i < n; i++)?? {
????????if(i==0){
??????printf("%d", S[i]);}
else if (i){
????????????printf(" ");
????????printf("%d", S[i]);}
????}
????
????printf("\n%d\n", c);
??????
????return 0;
}
??
??

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ??
      | ^
main.c:9:1: error: expected identifier or '(' before '?' token
    9 | ??
      | ^
main.c:36:1: error: expected identifier or '(' before '?' token
   36 | ??
      | ^
main.c:46:1: error: expected identifier or '(' before '?' token
   46 | ??
      | ^
main.c:69:1: error: expected identifier or '(' before '?' token
   69 | ??
      | ^
Language: C


#include <stdio.h>
??
#define max 500000
??
int L[250002];
int R[250002];
int c=0;
??
??
??
int merge(int S[], int n, int l, int m, int r)?? {
????int i, j, k;
????int n1 = m - l;
????int n2 = r - m;
??????
????for (i = 0; i < n1; i++)
????????L[i] = S[l+i];
????for (i = 0; i < n2; i++)
????????R[i] = S[m+i];
??????
????L[n1] = R[n2] = 500000000
??????
????i = j = 0;
????for ( k = l; k < r; k++)?? {
????????if ( L[i] <= R[j])?? {
????????????S[k] = L[i]; 
i++;
}
????????else{
????????????S[k] = R[j];
j++;
}
????}
}
??
void mergeSort(int S[], int n, int l, int r)?? {
????
????if (l + 1 < r)?? {
????????int m = (l+r) / 2;
????????mergeSort(S,n, l,m);
????????mergeSort(S, n,m,r);
????????merge(S,n, l,m,r);
????}
}
??
int main(void)?? {
????int S[max], n, i,c;
????
??????
????scanf("%d", &n);
????for (i = 0; i < n; i++) 
????????scanf("%d", &S[i]);
??????
????mergeSort(S, n, 0, n);
??
????for (i = 0; i < n; i++)?? {
????????if(i==0){
??????printf("%d", S[i]);}
else if (i){
????????????printf(" ");
????????printf("%d", S[i]);}
????}
????
????printf("\n%d\n", c);
??????
????return 0;
}
??
??

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ??
      | ^
main.c:9:1: error: expected identifier or '(' before '?' token
    9 | ??
      | ^
main.c:36:1: error: expected identifier or '(' before '?' token
   36 | ??
      | ^
main.c:46:1: error: expected identifier or '(' before '?' token
   46 | ??
      | ^
main.c:69:1: error: expected identifier or '(' before '?' token
   69 | ??
      | ^
Language: C


#include <stdio.h>
#define max 500000  
int L[250002];
int R[250002];
int c=0;
int merge(int S[], int n, int l, int m, int r)??{
????int i, j, k;      
????int n1 = m-l;
????int n2 = r-m;
????for (i = 0; i < n1; i++)
????????L[i] = S[l+i];
????for (i = 0; i < n2; i++)
????????R[i] = S[m+i];
????L[n1] = R[n2] = 500000000;
????i = j = 0;
????for ( k = l; k < r; k++){
????????if ( L[i] <= R[j]){
????????????S[k] = L[i]; 
i++;
}
????????else{
????????????S[k] = R[j];
j++;}
}
}
void mergeSort(int S[], int n, int l, int r){
????if (l + 1 < r)??{
????????int m = (l+r) / 2;
????????mergeSort(S,n, l,m);
????????mergeSort(S, n,m,r);
????????merge(S,n, l,m,r);
????}
}
int main(void){
????int S[max], n, i,c;

????scanf("%d", &n);
????for (i = 0; i < n; i++) 
????????scanf("%d", &S[i]);
??????
????mergeSort(S, n, 0, n);
??
????for (i = 0; i < n; i++){
????????if(i==0){
??????printf("%d", S[i]);}
else if (i){
????????????printf(" ");
????????printf("%d", S[i]);}
????}
????
????printf("\n%d\n", c);
??????
????return 0;
}

Compiler output:
main.c: In function 'merge':
main.c:7:47: error: expected declaration specifiers before '?' token
    7 | int merge(int S[], int n, int l, int m, int r)??{
      |                                               ^
main.c:27:45: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
   27 | void mergeSort(int S[], int n, int l, int r){
      |                                             ^
main.c:35:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
   35 | int main(void){
      |               ^
main.c:56: error: expected '{' at end of input
Language: C


#include <stdio.h>
#define max 500000  
int L[250002];
int R[250002];
int c=0;
int merge(int S[], int n, int l, int m, int r){
int i, j, k;      
int n1 = m-l;
int n2 = r-m;
for (i = 0; i < n1; i++)
L[i] = S[l+i];
for (i = 0; i < n2; i++)
R[i] = S[m+i];
L[n1] = R[n2] = 500000000;
??i = j = 0;
??for ( k = l; k < r; k++){
????????if ( L[i] <= R[j]){
????????????S[k] = L[i]; 
i++;
}
????????else{
????????????S[k] = R[j];
j++;}
}
}
void mergeSort(int S[], int n, int l, int r){
????if (l + 1 < r)??{
????????int m = (l+r) / 2;
????????mergeSort(S,n, l,m);
????????mergeSort(S, n,m,r);
????????merge(S,n, l,m,r);
????}
}
int main(void){
????int S[max], n, i,c;

????scanf("%d", &n);
????for (i = 0; i < n; i++) 
????????scanf("%d", &S[i]);
??????
????mergeSort(S, n, 0, n);
??
????for (i = 0; i < n; i++){
????????if(i==0){
??????printf("%d", S[i]);}
else if (i){
????????????printf(" ");
????????printf("%d", S[i]);}
????}
????
????printf("\n%d\n", c);
??????
????return 0;
}

Compiler output:
main.c: In function 'merge':
main.c:16:1: error: expected expression before '?' token
   16 | ??i = j = 0;
      | ^
main.c:17:1: error: expected expression before '?' token
   17 | ??for ( k = l; k < r; k++){
      | ^
main.c: In function 'mergeSort':
main.c:28:1: error: expected expression before '?' token
   28 | ????if (l + 1 < r)??{
      | ^
main.c: In function 'main':
main.c:36:1: error: expected expression before '?' token
   36 | ????int S[max], n, i,c;
      | ^
main.c:38:1: error: expected expression before '?' token
   38 | ????scanf("%d", &n);
      | ^
main.c:38:18: error: 'n' undeclared (first use in this function)
   38 | ????scanf("%d", &n);
      |                  ^
main.c:38:18: note: each undeclared identifier is reported only once for each function it appears in
main.c:39:1: error: expected expression before '?' token
   39 | ????for (i = 0; i < n; i++)
      | ^
main.c:41:1: error: expected expression before '?' token
   41 | ??????
      | ^
main.c:42:15: error: 'S' undeclared (first use in this function)
   42 | ????mergeSort(S, n, 0, n);
      |               ^
main.c:43:1: error: expected expression before '?' token
   43 | ??
      | ^
main.c:53:1: error: expected expression before '?' token
   53 | ??????
      | ^
Language: C


#include <stdio.h>
#define max 500000  
int L[250002];
int R[250002];
int c=0;
int merge(int S[], int n, int l, int m, int r){
int i, j, k;      
int n1 = m-l;
int n2 = r-m;
for (i = 0; i < n1; i++)
L[i] = S[l+i];
for (i = 0; i < n2; i++)
R[i] = S[m+i];
L[n1] = R[n2] = 500000000;
i = j = 0;
for ( k = l; k < r; k++){
if ( L[i] <= R[j]){
S[k] = L[i]; 
i++;
}
else{
S[k] = R[j];
j++;}
}
}
void mergeSort(int S[], int n, int l, int r){
??if (l + 1 < r)??{
??int m = (l+r) / 2;
??mergeSort(S,n, l,m);
??mergeSort(S, n,m,r);
??merge(S,n, l,m,r);
????}
}
int main(void){
int S[max], n, i,c;

scanf("%d", &n);
for (i = 0; i < n; i++) 
scanf("%d", &S[i]);
??????
mergeSort(S, n, 0, n);
??
for (i = 0; i < n; i++){
if(i==0){
printf("%d", S[i]);}
else if (i){
printf(" ");
printf("%d", S[i]);}
}
printf("\n%d\n", c);

return 0;
}

Compiler output:
main.c: In function 'mergeSort':
main.c:28:1: error: expected expression before '?' token
   28 | ??if (l + 1 < r)??{
      | ^
main.c: In function 'main':
main.c:41:1: error: expected expression before '?' token
   41 | ??????
      | ^
main.c:43:1: error: expected expression before '?' token
   43 | ??
      | ^
Language: C


#include <stdio.h>
#define max 500000  
int L[250002];
int R[250002];
int c=0;
int merge(int S[], int n, int l, int m, int r){
int i, j, k;      
int n1 = m-l;
int n2 = r-m;
for (i = 0; i < n1; i++)
L[i] = S[l+i];
for (i = 0; i < n2; i++)
R[i] = S[m+i];
L[n1] = R[n2] = 500000000;
i = j = 0;
for ( k = l; k < r; k++){
if ( L[i] <= R[j]){
S[k] = L[i]; 
i++;
}
else{
S[k] = R[j];
j++;}
}
}
void mergeSort(int S[], int n, int l, int r){
if (l + 1 < r)??{
int m = (l+r) / 2;
mergeSort(S,n, l,m);
mergeSort(S, n,m,r);
merge(S,n, l,m,r);
}
}
int main(void){
int S[max], n, i,c;

scanf("%d", &n);
for (i = 0; i < n; i++) 
scanf("%d", &S[i]);
??????
mergeSort(S, n, 0, n);
??
for (i = 0; i < n; i++){
if(i==0){
printf("%d", S[i]);}
else if (i){
printf(" ");
printf("%d", S[i]);}
}
printf("\n%d\n", c);

return 0;
}

Compiler output:
main.c: In function 'mergeSort':
main.c:28:15: error: expected expression before '?' token
   28 | if (l + 1 < r)??{
      |               ^
main.c: In function 'main':
main.c:41:1: error: expected expression before '?' token
   41 | ??????
      | ^
main.c:43:1: error: expected expression before '?' token
   43 | ??
      | ^
Language: C

#include <stdio.h>
#include <math.h>
#define N 1000000


int n, s[N], x=0;

void merge(int, int, int);
void mergeSort(int, int);
int main()
{

int i;

scanf("%d",&n);

for(i=0; i<n; i++)

scanf("%d",&s[i]);

mergeSort(0,n);
??
for(i=0;i<n;i++){
   printf("%d", s[i]);

    if(i!=n-1) printf(" ");
  }

  printf("\n%d\n", x);

  return 0;
}

void merge(int left, int mid, int right)
{
  int n1, n2, i, j, k, L[N], R[N];
  n1 = mid - left;
  n2 = right - mid;
  for(i=0; i<=n1-1; i++)
    L[i] = s[left + i];
  for(i=0; i<=n2-1; i++)
    R[i] = s[mid + i];
    L[n1] = INFINITY;
    R[n2] = INFINITY;
  i = 0;
  j = 0;
  for(k=left; k<=right-1; k++)
    if(L[i] <= R[j]){
     s[k] = L[i];
      i = i + 1;
      x++;
    } else {
      s[k] = R[j];
      j = j + 1;
      x++;
    }
}
void mergeSort(int left, int right)
{
  int mid;
  if(left+1 < right){
    mid = (left + right)/2;
    mergeSort(left, mid);
    mergeSort(mid, right);
    merge(left, mid, right);
   }
}

Compiler output:
main.c: In function 'main':
main.c:22:1: error: expected expression before '?' token
   22 | ??
      | ^
main.c: In function 'merge':
main.c:43:13: warning: overflow in conversion from 'float' to 'int' changes value from '+Inff' to '2147483647' [-Woverflow]
   43 |     L[n1] = INFINITY;
      |             ^~~~~~~~
main.c:44:13: warning: overflow in conversion from 'float' to 'int' changes value from '+Inff' to '2147483647' [-Woverflow]
   44 |     R[n2] = INFINITY;
      |             ^~~~~~~~
Language: C

#include<stdio.h>

int count;

void merge(int A[], int left, int mid, int right, int n){
????????
int n1, n2, L[250001], R[250001], i, j, k;
n1 = mid - left;
n2 = right - mid;
for(i = 0; i < n1; i++){
L[i] = A[left + i];
}
for(i = 0; i < n2; i++){
R[i] = A[mid + i];
}
L[n1] = 2000000000;
R[n2] = 2000000000;
i = 0;
j = 0;
for(k = left; k < right; k++){
count++;
if(L[i] <= R[j]){
A[k] = L[i];
i++;
}
else{
A[k] = R[j];
j++;
}

}

}



void mergeSort(int A[], int left, int right, int n){
????????
int mid;
if(left + 1 < right){
mid = (left + right) / 2;
mergeSort(A, left, mid, n);
mergeSort(A, mid, right, n);
merge(A, left, mid, right, n);
}

}



int main(void){
????????
int A[500000], n, i;
count = 0;
????????
scanf("%d",&n);
for(i = 0; i < n; i++){
scanf("%d",&A[i]);
}

mergeSort(A, 0, n, n);
????????
for(i = 0; i < n; i++){
if(i != 0) printf(" ");
printf("%d", A[i]);
}

printf("\n");
printf("%d\n",count);

return 0;
}

Compiler output:
main.c: In function 'merge':
main.c:6:1: error: expected expression before '?' token
    6 | ????????
      | ^
main.c:8:1: error: 'n1' undeclared (first use in this function); did you mean 'n'?
    8 | n1 = mid - left;
      | ^~
      | n
main.c:8:1: note: each undeclared identifier is reported only once for each function it appears in
main.c:9:1: error: 'n2' undeclared (first use in this function); did you mean 'n'?
    9 | n2 = right - mid;
      | ^~
      | n
main.c:10:5: error: 'i' undeclared (first use in this function)
   10 | for(i = 0; i < n1; i++){
      |     ^
main.c:11:1: error: 'L' undeclared (first use in this function)
   11 | L[i] = A[left + i];
      | ^
main.c:14:1: error: 'R' undeclared (first use in this function)
   14 | R[i] = A[mid + i];
      | ^
main.c:19:1: error: 'j' undeclared (first use in this function)
   19 | j = 0;
      | ^
main.c:20:5: error: 'k' undeclared (first use in this function)
   20 | for(k = left; k < right; k++){
      |     ^
main.c: In function 'mergeSort':
main.c:38:1: error: expected expression before '?' token
   38 | ????????
      | ^
main.c:41:1: error: 'mid' undeclared (first use in this function)
   41 | mid = (left + right) / 2;
      | ^~~
main.c: In function 'main':
main.c:52:1: error: expected expression before '?' token
   52 | ????????
      | ^
main.c:55:1: error: expected expression before '?' token
   55 | ????????
      | ^
main.c:56:13: error: 'n' undeclared (first use in this function)
   56 | scanf("%d",&n);
      |             ^
main.c:57:5: error: 'i' undeclared (first use in this function)
   57 | for(i = 0; i < n; i++){
      |     ^
main.c:58:13: error: 'A' undeclared (first use in this function)
   58 | scanf("%d",&A[i]);
      |             ^
main.c:62:1: error: expected expression before '?' token
   62 | ????????
      | ^
Language: C

#include<stdio.h>

int count;

void merge(int A[], int left, int mid, int right, int n){

int n1, n2, L[250001], R[250001], i, j, k;
n1 = mid - left;
n2 = right - mid;
for(i = 0; i < n1; i++){
L[i] = A[left + i];
}
for(i = 0; i < n2; i++){
R[i] = A[mid + i];
}
L[n1] = 2000000000;
R[n2] = 2000000000;
i = 0;
j = 0;
for(k = left; k < right; k++){
count++;
if(L[i] <= R[j]){
A[k] = L[i];
i++;
}
else{
A[k] = R[j];
j++;
}

}

}



void mergeSort(int A[], int left, int right, int n){
????????
int mid;
if(left + 1 < right){
mid = (left + right) / 2;
mergeSort(A, left, mid, n);
mergeSort(A, mid, right, n);
merge(A, left, mid, right, n);
}

}



int main(void){
????????
int A[500000], n, i;
count = 0;
????????
scanf("%d",&n);
for(i = 0; i < n; i++){
scanf("%d",&A[i]);
}

mergeSort(A, 0, n, n);
????????
for(i = 0; i < n; i++){
if(i != 0) printf(" ");
printf("%d", A[i]);
}

printf("\n");
printf("%d\n",count);

return 0;
}

Compiler output:
main.c: In function 'mergeSort':
main.c:38:1: error: expected expression before '?' token
   38 | ????????
      | ^
main.c:41:1: error: 'mid' undeclared (first use in this function)
   41 | mid = (left + right) / 2;
      | ^~~
main.c:41:1: note: each undeclared identifier is reported only once for each function it appears in
main.c: In function 'main':
main.c:52:1: error: expected expression before '?' token
   52 | ????????
      | ^
main.c:55:1: error: expected expression before '?' token
   55 | ????????
      | ^
main.c:56:13: error: 'n' undeclared (first use in this function)
   56 | scanf("%d",&n);
      |             ^
main.c:57:5: error: 'i' undeclared (first use in this function)
   57 | for(i = 0; i < n; i++){
      |     ^
main.c:58:13: error: 'A' undeclared (first use in this function)
   58 | scanf("%d",&A[i]);
      |             ^
main.c:62:1: error: expected expression before '?' token
   62 | ????????
      | ^
Language: C

#include <stdio.h>
#define max 500000  
int L[max/2+2];
int R[max/2+2];
int c=0;
int merge(int S[], int n, int left, int mid, int right){
int i, j, k;      
int n1 = mid-left;
int n2 = right-mid;
for (i = 0; i < n1; i++)
L[i] = S[left+i];
for (i = 0; i < n2; i++)
R[i] = S[mid+i];
L[n1] = R[n2] = 2000000000;
i = j = 0;
for ( k = left; k < right; k++){
c++;
if ( L[i] <= R[j]){
S[k] = L[i]; 
i++;
}
else{
S[k] = R[j];
j++;
}
}
}
void mergeSort(int S[], int n, int left, int right){
int mid;
if (left+1<right){
m = (left+right) / 2;
mergeSort(S,n, left,mid);
mergeSort(S, n,mid,right);
merge(S,n, left,mid,right);
}
}
int main(){
int S[max], n, i;
 
scanf("%d", &n);
for (i = 0; i < n; i++) 
scanf("%d", &S[i]); 
mergeSort(S, n, 0, n);
for (i = 0; i < n; i++){
if(i==0)
printf("%d", S[i]);
else 
printf(" %d", S[i]);
}

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

Compiler output:
main.c: In function 'mergeSort':
main.c:31:1: error: 'm' undeclared (first use in this function)
   31 | m = (left+right) / 2;
      | ^
main.c:31:1: note: each undeclared identifier is reported only once for each function it appears in