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

#include<stdio.h>

int main(void)
{
	int N,count=0;
	scanf("%d",&N);
	if(N<10) count=N;
	if(N>=10 && N<100) count=9;
	if(N>=100 && N<1000) count=N-100+1+9;
	if(N>=1000 && N<10000) count=N-90;
	if(N>=10000 && N<100000) count=N-10000+9+900;
	if(N>=100000) count=N-10000+9+900;
	printf("%d\n",count);
}

	123455

Compiler output:
main.c:16:9: error: expected identifier or '(' before numeric constant
   16 |         123455
      |         ^~~~~~
Language: C++

int main(){
    int n,a,c;
    cin>>n;
    for(int i=1;i<=n;i++){
        c=i;
        for(int k=0;;k++){
            if(c==0){
                break;
            }
        if(c%2!=0){
            a++;
        }
        c/=10;
        }
    }
    cout<<a<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin>>n;
      |     ^~~
a.cc:16:5: error: 'cout' was not declared in this scope
   16 |     cout<<a<<endl;
      |     ^~~~
a.cc:16:14: error: 'endl' was not declared in this scope
   16 |     cout<<a<<endl;
      |              ^~~~
Language: C++

    #include<bits/stdc++.h>
    using namespace std;
    int main()
    {
      int n , count1=0 ,t;
      cin>>n;
      while(n){
            t=n;
        int count =0;
        while(t){
            t=t/10;
            count++;
        }
        if(count%2!=0){
            count1++;
        }
        n--;
     }
    cout<<count1<<endl;
     
     
     return 0;
    

Compiler output:
a.cc: In function 'int main()':
a.cc:22:15: error: expected '}' at end of input
   22 |      return 0;
      |               ^
a.cc:4:5: note: to match this '{'
    4 |     {
      |     ^
Language: C++

    include<bits/stdc++.h>
    using namespace std;
    int main()
    {
      int n , count1=0 ,t;
      cin>>n;
      while(n){
            t=n;
        int count =0;
        while(t){
            t=t/10;
            count++;
        }
        if(count%2!=0){
            count1++;
        }
        n--;
     }
    cout<<count1<<endl;
     
     
     return 0;
    }

Compiler output:
a.cc:1:5: error: 'include' does not name a type
    1 |     include<bits/stdc++.h>
      |     ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:7: error: 'cin' was not declared in this scope
    6 |       cin>>n;
      |       ^~~
a.cc:19:5: error: 'cout' was not declared in this scope; did you mean 'count1'?
   19 |     cout<<count1<<endl;
      |     ^~~~
      |     count1
a.cc:19:19: error: 'endl' was not declared in this scope
   19 |     cout<<count1<<endl;
      |                   ^~~~
Language: C++

    include<bits/stdc++.h>
    using namespace std;
    int main(){
     int n , count1=0 ,t;
     cin>>n;
     while(n){
            t=n;
        int count =0;
        while(t){
            t=t/10;
            count++;
        }
        if(count%2!=0){
            count1++;
        }
        n--;
     }
    cout<<count1<<endl;
     
     
     
    }

Compiler output:
a.cc:1:5: error: 'include' does not name a type
    1 |     include<bits/stdc++.h>
      |     ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:6: error: 'cin' was not declared in this scope
    5 |      cin>>n;
      |      ^~~
a.cc:18:5: error: 'cout' was not declared in this scope; did you mean 'count1'?
   18 |     cout<<count1<<endl;
      |     ^~~~
      |     count1
a.cc:18:19: error: 'endl' was not declared in this scope
   18 |     cout<<count1<<endl;
      |                   ^~~~
Language: C++

include<bits/stdc++.h>
using namespace std;
int main(){
 int n , count1=0 ,t;
 cin>>n;
 while(n){
        t=n;
    li count =0;
    while(t){
        t=t/10;
        count++;
    }
    if(count%2!=0){
        count1++;
    }
    n--;
 }
cout<<count1<<endl;
 
 
 
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:2: error: 'cin' was not declared in this scope
    5 |  cin>>n;
      |  ^~~
a.cc:8:5: error: 'li' was not declared in this scope
    8 |     li count =0;
      |     ^~
a.cc:11:9: error: 'count' was not declared in this scope; did you mean 'count1'?
   11 |         count++;
      |         ^~~~~
      |         count1
a.cc:13:8: error: 'count' was not declared in this scope; did you mean 'count1'?
   13 |     if(count%2!=0){
      |        ^~~~~
      |        count1
a.cc:18:1: error: 'cout' was not declared in this scope; did you mean 'count1'?
   18 | cout<<count1<<endl;
      | ^~~~
      | count1
a.cc:18:15: error: 'endl' was not declared in this scope
   18 | cout<<count1<<endl;
      |               ^~~~
Language: C++

using namespace std;
#include <iostream>
#include <algorithm>
#define ll long long
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
ll mod = 1e9+7;


int main(){

    int n;
    cin >> n;

    ll ans = 0;

    for(int i=1; i<=n; i++){
        int tmp = log10(i);
        if(tmp%2 == 1) ans++;
    }

    cout << ans << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:19: error: 'log10' was not declared in this scope
   17 |         int tmp = log10(i);
      |                   ^~~~~
Language: C

#include<stdio.h>
#include<math.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
int main(){
    int n,cnt=0;
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        int j=i,keta=0;
        while(j!=0){
            j/=10;keta++;
        }
        if(keta%2==1){
            cnt++
        }
    }
    printf("%d",cnt);
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:15:18: error: expected ';' before '}' token
   15 |             cnt++
      |                  ^
      |                  ;
   16 |         }
      |         ~
Language: C

#include<stdio.h>
#include<math.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
int main(){
    int n,cnt=0;
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        int j=i,ketasu=0;
        while(j!=0){
            j/=10;keta++;
        }
        if(keta%2==1){
            cnt++
        }
    }
    printf("%d",cnt);
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:19: error: 'keta' undeclared (first use in this function); did you mean 'ketasu'?
   12 |             j/=10;keta++;
      |                   ^~~~
      |                   ketasu
main.c:12:19: note: each undeclared identifier is reported only once for each function it appears in
main.c:15:18: error: expected ';' before '}' token
   15 |             cnt++
      |                  ^
      |                  ;
   16 |         }
      |         ~
Language: C++

#include <iostream>
#include <cstring>
#include <map>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#define all(x) x.begin(),x.end()

using namespace std;



int main()
{  
   int n;cin>>n;
   if(n<=9)cout<<n;
   else if(n>9&&n<100)cout<<9;
   else if(n>=100&&n<1000)cout<<(n-100+1)+9;
   else if(n>=1000&&n<10000)cout<<(9+900);
   else if(n>=10000&&n<100000)cout<<(n-10000+1 + 9 + 900);
   else cout<<(90909)
   
  
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:22:22: error: expected ';' before '}' token
   22 |    else cout<<(90909)
      |                      ^
      |                      ;
......
   25 | }
      | ~
Language: Java

import java.util.*;
public class div481{
	public static void main(String sp[]){
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
String st = String.valueOf(n);
long total=0;
if(n<10){
	System.out.println(n);
}
else if(n<100){
	System.out.println(9);
}
else if(n<1000){
	System.out.println(9+(n-100+1));
}
else if(n<10000){
	System.out.println(9+(n-100+1));
}
else if(n<100000)
	System.out.println(9+900+(n-10000+1));
else System.out.println(9+900+(n-10001+1));
}
}

Compiler output:
Main.java:2: error: class div481 is public, should be declared in a file named div481.java
public class div481{
       ^
1 error
Language: Java


import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        final Scanner scanner = new Scanner(System.in);
        final String s = scanner.nextLine();

        switch (s.length()) {
            case 1:
                System.out.println(Integer.parseInt(s));
                break;
            case 2:
                System.out.println(9);
                break;
            case 3:
                System.out.println((9 + Integer.parseInt(s) - 99));
                break
            case 4:
                System.out.println(909);
                break;
            case 5:
                System.out.println((909 + Integer.parseInt(s) - 9999));
                break;
            default:
                System.out.println(90909);
        }
    }
}


Compiler output:
Main.java:18: error: ';' expected
                break
                     ^
1 error
Language: C++

#include<iostream>
using namespace std;
int main(){
	int n,j=0,total=0,sum=0,I,L,M;
	cin>>n;
	for(int i=1;i<=n;i+=j){
		I=i;
		L=i;
		M=i;
		while(I){//100
			sum+=1;//3
			I/=10;//0
		}
		if(sum%2==1){//100
			while(sum--){//0
				total+=L*9;//999
				L/=10;//1
			}	
			total-=i;
			j=1;
		}
		else{
			while(sum--){
				j+=m*9;
				M/=10;
			}
			j++; 
		}
	}
	cout<<total;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:36: error: 'm' was not declared in this scope
   24 |                                 j+=m*9;
      |                                    ^
Language: C++

#include<iostream>
using namespace std;
int main(){
	int n,j=0,total=0,sum=0,I,L,M;
	cin>>n;
	for(int i=1;i<=n;i+=j){
		I=i;
		L=i;
		M=i;
		while(I){//100
			sum+=1;//3
			I/=10;//0
		}
		if(sum%2==1){//100
			while(sum--){//0
				total+=L*9;//999
				L/=10;//1
			}	
			total-=i;
			j=1;
		}
		else{
			while(sum--){
				j+=m*9;
				m/=10;
			}
			j++; 
		}
	}
	cout<<total;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:36: error: 'm' was not declared in this scope
   24 |                                 j+=m*9;
      |                                    ^
Language: C++

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

int main () {
  int n;
  cin >> n;
  
  int cnt=0;
  for(int i=1;i<=n;i++){
    if(i.size()/2==1){
      cnt++;
    }
  }
  cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:10: error: request for member 'size' in 'i', which is of non-class type 'int'
   10 |     if(i.size()/2==1){
      |          ^~~~
Language: C++

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

int main () {
  string n;
  cin >> n;
  
  int cnt=0;
  for(int i=1;i<=n.size;i++){
    if(i.size()/2==1){
      cnt++;
    }
  }
  cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:20: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    9 |   for(int i=1;i<=n.size;i++){
      |                  ~~^~~~
      |                        ()
a.cc:10:10: error: request for member 'size' in 'i', which is of non-class type 'int'
   10 |     if(i.size()/2==1){
      |          ^~~~
Language: C++

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

int main () {
  string n;
  cin >> n;
  
  int cnt=0;
  for(int i=1;i<=n.size;i++){
    if(i.size()/2==1){
      cnt++;
    }
  }
  cout << cnt << endl;
}

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

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

int main(){
  int N;
  cin >> N;
  int cnt;
  
  for(int i=1;i<=N;i++){
    if(N.size()==2){
      N+=89;
    }
    else if (N.size()==4){
      N+=8999;
    }
    else if(N.size()==6){
      break;
    }
    cnt++;
  }
  cout << cnt ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:10: error: request for member 'size' in 'N', which is of non-class type 'int'
   10 |     if(N.size()==2){
      |          ^~~~
a.cc:13:16: error: request for member 'size' in 'N', which is of non-class type 'int'
   13 |     else if (N.size()==4){
      |                ^~~~
a.cc:16:15: error: request for member 'size' in 'N', which is of non-class type 'int'
   16 |     else if(N.size()==6){
      |               ^~~~
Language: C++

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

int main() {
  int n;
  cin >> n;
  int ans;
  
  if(n/100000>0) ans = 90909;
  elseif(n/10000>0) ans = 909 + n - 9999;
  elseif(n/1000>0) ans = 909;
  elseif(n/100>0) ans = 9 + n - 99;
  elseif(n/10>0) ans = 9;
  else ans = n;
  
  cout << ans << endl;
}
    
    

Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: 'elseif' was not declared in this scope
   10 |   elseif(n/10000>0) ans = 909 + n - 9999;
      |   ^~~~~~
a.cc:14:3: error: 'else' without a previous 'if'
   14 |   else ans = n;
      |   ^~~~
Language: C++

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

int main() {
  int n;
  cin >> n;
  int ans;
  
  if(n/100000>0) ans = 90909;
  elseif(n/10000) ans = 909 + n - 9999;
  elseif(n/1000) ans = 909;
  elseif(n/100) ans = 9 + n - 99;
  elseif(n/10) ans = 9;
  else ans = n;
  
  cout << ans << endl;
}
    
    

Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: 'elseif' was not declared in this scope
   10 |   elseif(n/10000) ans = 909 + n - 9999;
      |   ^~~~~~
a.cc:14:3: error: 'else' without a previous 'if'
   14 |   else ans = n;
      |   ^~~~
Language: C++

n = gets.chomp.split('').map(&:to_i)
number = 0
i= n.length
        
if i % 2 == 1
  for num in 1..i
    number += n[num - 1] * (10 ** (i - num))
  end
  for num in 1..i / 2
    i = i - 2 > 0 ? i : 2
    number -= 9 * (10 ** (i - 2 * num))
  end
  puts number 
else
  for num in 1..i / 2
    number += 9 * (10 ** (i - 2 * num))
  end
  puts number
end


Compiler output:
a.cc:1:22: error: empty character constant
    1 | n = gets.chomp.split('').map(&:to_i)
      |                      ^~
a.cc:6:14: error: too many decimal points in number
    6 |   for num in 1..i
      |              ^~~~
a.cc:9:14: error: too many decimal points in number
    9 |   for num in 1..i / 2
      |              ^~~~
a.cc:15:14: error: too many decimal points in number
   15 |   for num in 1..i / 2
      |              ^~~~
a.cc:1:1: error: 'n' does not name a type
    1 | n = gets.chomp.split('').map(&:to_i)
      | ^
Language: C++

n = gets.chomp.split('').map(&:to_i)
number = 0
i= n.length
        
if i % 2 == 1
  for num in 1..i
    number += n[num - 1] * (10 ** (i - num))
  end
  for num in 1..i / 2
    i = i - 2 > 0 ? i : 2
    number -= 9 * (10 ** (i - 2 * num))
  end
  puts number 
else
   for num in 1..i / 2
     number += 9 * (10 ** (i - 2 * num))
   end
   puts number
end


Compiler output:
a.cc:1:22: error: empty character constant
    1 | n = gets.chomp.split('').map(&:to_i)
      |                      ^~
a.cc:6:14: error: too many decimal points in number
    6 |   for num in 1..i
      |              ^~~~
a.cc:9:14: error: too many decimal points in number
    9 |   for num in 1..i / 2
      |              ^~~~
a.cc:15:15: error: too many decimal points in number
   15 |    for num in 1..i / 2
      |               ^~~~
a.cc:1:1: error: 'n' does not name a type
    1 | n = gets.chomp.split('').map(&:to_i)
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int N;
int a[6] = {0, 9, 9, 909, 909, 90909};
int b[6] = {1, 0, 100, 0, 10000, 0};

int countDigits(int x) {
    int cnt = 0;
    while(x > 0) {
        cnt ++;
        x = x / 10;
    }
    return cnt;
}

int main() {
    cin>>N;
    int cnt = countDigits(N);
    int cnt_b = 0;
    
    if(cnt % 2 == 1) {
        cnt_b = (N - b[cnt - 1] + 1);
    }
    cout<<a[cnt - 1] + cnt_b<<endl;
	

Compiler output:
a.cc: In function 'int main()':
a.cc:24:36: error: expected '}' at end of input
   24 |     cout<<a[cnt - 1] + cnt_b<<endl;
      |                                    ^
a.cc:16:12: note: to match this '{'
   16 | int main() {
      |            ^
Language: C++

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

bool f(int x) {
  int keta == 0;
  while(x) {
    keta ++;
    x /= 10;
  }
  return keta%2 =- 1;
}

int main() {
  int n;
  cin >> n;
  int ans = 0;
  for (int i = 1; i <= n; i++) {
    if (f(i)) ans ++;
  }
  cout << ans << end1;
  return 0;
}

Compiler output:
a.cc:4:9: error: 'Long' does not name a type; did you mean 'long'?
    4 | typedef Long Long il;
      |         ^~~~
      |         long
a.cc: In function 'bool f(int)':
a.cc:7:12: error: expected initializer before '==' token
    7 |   int keta == 0;
      |            ^~
a.cc:9:5: error: 'keta' was not declared in this scope
    9 |     keta ++;
      |     ^~~~
a.cc:12:10: error: 'keta' was not declared in this scope
   12 |   return keta%2 =- 1;
      |          ^~~~
a.cc: In function 'int main()':
a.cc:22:18: error: 'end1' was not declared in this scope
   22 |   cout << ans << end1;
      |                  ^~~~
Language: C

#include<stdio.h>

int main(){

  int n;
  scanf(%d,&n);
  
  if(1<=n<10){
  	printf("%d",n);
  } else if(10<=n<100){
    printf("9");
  }else if(100<=n<1000){
    printf("%d-90",n);
  }else if(1000<=n<10000){
    printf("909");
  }else if(10000<=n<100000){
    printf("%d-9000",n);
  }else if(n=100000){
    printf("90909");
  }
    return 0;
}	


Compiler output:
main.c: In function 'main':
main.c:6:9: error: expected expression before '%' token
    6 |   scanf(%d,&n);
      |         ^
Language: C

#include<stdio.h>

int main(){

  int n;
  scanf(%d,&n);
  
  if(1<=n<10){
  	printf(%d,n);
  } else if(10<=n<100){
    printf("9");
  }else if(100<=n<1000){
    printf("%d-90",n);
  }else if(1000<=n<10000){
    printf("909");
  }else if(10000<=n<100000){
    printf("%d-9000",n);
  }else if(n=100000){
    printf("90909");
  }
    return 0;
}	


Compiler output:
main.c: In function 'main':
main.c:6:9: error: expected expression before '%' token
    6 |   scanf(%d,&n);
      |         ^
main.c:9:16: error: expected expression before '%' token
    9 |         printf(%d,n);
      |                ^
Language: C

#include<stdio.h>

int main(){

  int n;
  scanf(%d,&n);
  
  if(1<=n<10){
  	printf(%d,n);
  } else if(10<=n<100){
    printf("9");
  }else if(100<=n<1000){
    printf("%d-90",n);
  }else if(1000<=n<10000){
    printf("909");
  }else if(10000<=n<100000){
    printf("%d-9000",n);
  }else if(n=100000){
    printf("90909");

    return 0;
}	


Compiler output:
main.c: In function 'main':
main.c:6:9: error: expected expression before '%' token
    6 |   scanf(%d,&n);
      |         ^
main.c:9:16: error: expected expression before '%' token
    9 |         printf(%d,n);
      |                ^
main.c:22:1: error: expected declaration or statement at end of input
   22 | }
      | ^
Language: C

#include<stdio.h>

int main(){

  int n;
  scanf(%d,&n);
  
  if(1<=n<10){
  	printf(%d,n);
  } else if(10<=n<100){
    printf("9");
  }else if(100<=n<1000){
    printf("%d-90",n);
  }else if(1000<=n<10000){
    printf("909");
  }else if(10000<=n<100000){
    printf("%d-9000",n);
  }else if(n=100000){
    printf("90909")

    return 0;
}	


Compiler output:
main.c: In function 'main':
main.c:6:9: error: expected expression before '%' token
    6 |   scanf(%d,&n);
      |         ^
main.c:9:16: error: expected expression before '%' token
    9 |         printf(%d,n);
      |                ^
main.c:19:20: error: expected ';' before 'return'
   19 |     printf("90909")
      |                    ^
      |                    ;
   20 | 
   21 |     return 0;
      |     ~~~~~~          
main.c:22:1: error: expected declaration or statement at end of input
   22 | }
      | ^
Language: C++

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

int N;
int main(){
  cin>>N;
  int ans=0;
  rep(i, N+1) {
    if(1<=i && i<10) ans++;
    if(100<=i &&i<1000) ans++;
    if(10000<=i && i<100000) ans++;
  }
  cout<<ans<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: 'i' was not declared in this scope
   10 |     if(1<=i && i<10) ans++;
      |           ^
a.cc:11:13: error: 'i' was not declared in this scope
   11 |     if(100<=i &&i<1000) ans++;
      |             ^
a.cc:12:15: error: 'i' was not declared in this scope
   12 |     if(10000<=i && i<100000) ans++;
      |               ^
Language: C++

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

int N;
int main(){
  cin>>N;
  int ans=0;
  rep(i, N) {
    if(1<=i && i<10) ans++;
    if(100<=i &&i<1000) ans++;
    if(10000<=i && i<100000) ans++;
  }
  cout<<ans<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: 'i' was not declared in this scope
   10 |     if(1<=i && i<10) ans++;
      |           ^
a.cc:11:13: error: 'i' was not declared in this scope
   11 |     if(100<=i &&i<1000) ans++;
      |             ^
a.cc:12:15: error: 'i' was not declared in this scope
   12 |     if(10000<=i && i<100000) ans++;
      |               ^
Language: Java

import java.io.*; 
import java.util.*; 

public class p2{ 
	
	static class FastReader{ 
		BufferedReader br; 
		StringTokenizer st; 

		public FastReader() 
		{ 
			br = new BufferedReader(new
					InputStreamReader(System.in)); 
		} 

		String next() 
		{ 
			while (st == null || !st.hasMoreElements()) 
			{ 
				try
				{ 
					st = new StringTokenizer(br.readLine()); 
				} 
				catch (IOException e) 
				{ 
					e.printStackTrace(); 
				} 
			} 
			return st.nextToken(); 
		} 

		int nextInt() 
		{ 
			return Integer.parseInt(next()); 
		} 

		long nextLong() 
		{ 
			return Long.parseLong(next()); 
		} 

		double nextDouble() 
		{ 
			return Double.parseDouble(next()); 
		} 

		String nextLine() 
		{ 
			String str = ""; 
			try
			{ 
				str = br.readLine(); 
			} 
			catch (IOException e) 
			{ 
				e.printStackTrace(); 
			} 
			return str; 
		} 
	}
  
  	static int findd(int n){
      int res = 0;
      while(n>0){
          res++;
          n/=10;
      }
      return res;
	}

	public static void main(String[] args) 
	{ 
		FastReader sc = new FastReader(); 
		int n = sc.nextInt(), ans=0;
		for(int i=1;i<=n;i++)
			if(findd(i)%2==1) ans++;
      
		System.out.println(ans); 
	} 
} 


Compiler output:
Main.java:4: error: class p2 is public, should be declared in a file named p2.java
public class p2{ 
       ^
1 error
Language: Java

import java.io.*; 
import java.util.*; 

public class p2{ 
	
	static class FastReader{ 
		BufferedReader br; 
		StringTokenizer st; 

		public FastReader() 
		{ 
			br = new BufferedReader(new
					InputStreamReader(System.in)); 
		} 

		String next() 
		{ 
			while (st == null || !st.hasMoreElements()) 
			{ 
				try
				{ 
					st = new StringTokenizer(br.readLine()); 
				} 
				catch (IOException e) 
				{ 
					e.printStackTrace(); 
				} 
			} 
			return st.nextToken(); 
		} 

		int nextInt() 
		{ 
			return Integer.parseInt(next()); 
		} 

		long nextLong() 
		{ 
			return Long.parseLong(next()); 
		} 

		double nextDouble() 
		{ 
			return Double.parseDouble(next()); 
		} 

		String nextLine() 
		{ 
			String str = ""; 
			try
			{ 
				str = br.readLine(); 
			} 
			catch (IOException e) 
			{ 
				e.printStackTrace(); 
			} 
			return str; 
		} 
	}
  
  	static int findd(int n){
      int res = 0;
      while(n>0)
          res++;
          n/=10;
      }
      return res;
	}

	public static void main(String[] args) 
	{ 
		FastReader sc = new FastReader(); 
		int n = sc.nextInt(), ans=0;
		for(int i=1;i<=n;i++)
			if(findd(i)%2==1) ans++;
      
		System.out.println(ans); 
	} 
} 


Compiler output:
Main.java:68: error: illegal start of type
      return res;
      ^
Main.java:68: error: <identifier> expected
      return res;
                ^
Main.java:71: error: unnamed classes are a preview feature and are disabled by default.
	public static void main(String[] args) 
	              ^
  (use --enable-preview to enable unnamed classes)
Main.java:80: error: class, interface, enum, or record expected
} 
^
4 errors
Language: C++

#include <iostream>
#include <cstring>
using namespace std;
 
int main() {
  int n = 1;
  cin >> n;
  
  int v = 1;
  int count = 0;
  while (v <= n) {
   if(strlen(v) % 2 == 1) {
     count++;
   }
    v++;
  }
  
  cout << count << endl;
 
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
   12 |    if(strlen(v) % 2 == 1) {
      |              ^
      |              |
      |              int
In file included from /usr/include/c++/14/cstring:43,
                 from a.cc:2:
/usr/include/string.h:407:35: note:   initializing argument 1 of 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
Language: C++

#include <iostrem>
#include <cstring>
using namespace std;

int main() {
  int n = 1;
  cin >> n;
  
  int v = 1;
  int count = 0;
  while (v <= n) {
   if(strlen(v) % 2 == 1) {
     count++;
   }
    v++;
  }
  
  cout << count << endl;
 
  return 0;
}

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

#include<iostream>
#include<cmath>
int main(){
    int num;
    int i;
    int tmp=0;
    int ans=0;
    int count=0;
    int flag=0;
    int orinum=0;
    int tmptmp=0;
    std::cin>>orinum;
    
    num=orinum;
    while(flag==0){
      if(num/10>0){
      	num=num/10;
        count++;
      }
      else{
        flag=1;
      }
    }

  if(count%2==0){
    tmp=std::pow(10,count);
    ans=orinum-tmp+ans+1;
    }
    for(i=count-1;i=>0;i--){
    	if(i%2==0){
          tmp=std::pow(10,i+1);
          tmptmp=std::pow(10,i);
          ans=ans+tmp-tmptmp;   
        }
    }
    ans=ans+9;
  std::cout<<ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:21: error: expected primary-expression before '>' token
   29 |     for(i=count-1;i=>0;i--){
      |                     ^
Language: C++

#include <cstdio>

int f1(int *_n){
	if(*_n > 10000){
    	return (*_n - 10000 +1) + f1(999);
    }else if(*_n > 1000){
    	return f1(999);
    }else if(*_n > 100){
    	return (*_n - 100 +1) + f1(9);
    }else if(*_n > 10){
    	return f1(9);
    }else if(*_n > 1000){
    	return *_n;
    }
}

int main (void)
{
    int n;
    scanf("%d", &n);
    printf("%d\n", f1(&n));
    return 0;
}

Compiler output:
a.cc: In function 'int f1(int*)':
a.cc:5:38: error: invalid conversion from 'int' to 'int*' [-fpermissive]
    5 |         return (*_n - 10000 +1) + f1(999);
      |                                      ^~~
      |                                      |
      |                                      int
a.cc:3:13: note:   initializing argument 1 of 'int f1(int*)'
    3 | int f1(int *_n){
      |        ~~~~~^~
a.cc:7:19: error: invalid conversion from 'int' to 'int*' [-fpermissive]
    7 |         return f1(999);
      |                   ^~~
      |                   |
      |                   int
a.cc:3:13: note:   initializing argument 1 of 'int f1(int*)'
    3 | int f1(int *_n){
      |        ~~~~~^~
a.cc:9:36: error: invalid conversion from 'int' to 'int*' [-fpermissive]
    9 |         return (*_n - 100 +1) + f1(9);
      |                                    ^
      |                                    |
      |                                    int
a.cc:3:13: note:   initializing argument 1 of 'int f1(int*)'
    3 | int f1(int *_n){
      |        ~~~~~^~
a.cc:11:19: error: invalid conversion from 'int' to 'int*' [-fpermissive]
   11 |         return f1(9);
      |                   ^
      |                   |
      |                   int
a.cc:3:13: note:   initializing argument 1 of 'int f1(int*)'
    3 | int f1(int *_n){
      |        ~~~~~^~
a.cc:15:1: warning: control reaches end of non-void function [-Wreturn-type]
   15 | }
      | ^
Language: C++

#include<iostream>
int main(){
    int num;
    int ans=0;
    int count=0;
    cin>>num;
    for(;;){
      if(num/10>0){
        count++;
      }
      else{
        break;
      }
    }
    if(count%2==0){
      for(i=count;i>0;i--){
        ans=ans+10^i;
      }
      ans=ans+9;
    }
  count<<ans;
}
      

Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |     cin>>num;
      |     ^~~
      |     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:16:11: error: 'i' was not declared in this scope
   16 |       for(i=count;i>0;i--){
      |           ^
Language: C++

#include <iostream>

using namespace std;

int main() {
    int N;
    scanf("%d", &N);
    int count = 0;
    for (int i = 1; i <= N; i++ ){
        if (isOddNumber(i))
        {
            count++;
        }
    }
    printf("%d", count);
}

Boolean isOddNumber(int number) {
    int cnt = 0;
    while (number > 0){
        cnt++;
        number /= 10;
    }
    if (number % 2 == 1)
    {
        return true;
    } else {
        return false;
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: 'isOddNumber' was not declared in this scope
   10 |         if (isOddNumber(i))
      |             ^~~~~~~~~~~
a.cc: At global scope:
a.cc:18:1: error: 'Boolean' does not name a type
   18 | Boolean isOddNumber(int number) {
      | ^~~~~~~
Language: C++

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

int main(){
	int N;
	cin >> N;
	int cnt = 0;
	for(int i = 1; i <= N; i++){
		string S = to_string(i);
		if(S.size() % 2 == !) cnt++;
	}
	cout << cnt << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:37: error: expected primary-expression before ')' token
   10 |                 if(S.size() % 2 == !) cnt++;
      |                                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  int ans = 0;
  for (int i = 1; i <= N; ++i) {
    if (log10(i) % 2 == 1) {
      ++ans;
    }
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: invalid operands of types '__gnu_cxx::__enable_if<true, double>::__type' {aka 'double'} and 'int' to binary 'operator%'
    8 |     if (log10(i) % 2 == 1) {
      |         ~~~~~~~~ ^ ~
      |              |     |
      |              |     int
      |              __gnu_cxx::__enable_if<true, double>::__type {aka double}
Language: C++

#include <iostream>
using namespace std;

int main(){
  int n;
  int a=0;
  cin>>n;
  for(int i=0;i<3;i++){
    if(n/10**(2*i+1)>0) a += 10**(2*i+1)-10**(2*i);
    else {a += n-10**(2*i); break;}
  }
  cout<<a<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: invalid type argument of unary '*' (have 'int')
    9 |     if(n/10**(2*i+1)>0) a += 10**(2*i+1)-10**(2*i);
      |             ^~~~~~~~
a.cc:9:33: error: invalid type argument of unary '*' (have 'int')
    9 |     if(n/10**(2*i+1)>0) a += 10**(2*i+1)-10**(2*i);
      |                                 ^~~~~~~~
a.cc:9:45: error: invalid type argument of unary '*' (have 'int')
    9 |     if(n/10**(2*i+1)>0) a += 10**(2*i+1)-10**(2*i);
      |                                             ^~~~~~
a.cc:10:21: error: invalid type argument of unary '*' (have 'int')
   10 |     else {a += n-10**(2*i); break;}
      |                     ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std; 
using   ll=long long;
#define fast           ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define endl           "\n"
#define F(i,n)         for(ll i=0;i<n;i++)
#define rep(i,a,b)     for(ll i=a;i<b;i++)
#define repp(i,a,b)    for(ll i=a;i>=b;i--)
#define pb             push_back
#define mp             make_pair
#define vll            vector<ll>
#define f              first
#define s              second
#define pll            pair<ll,ll>
#define ALL(v)         v.begin(),v.end()
#define ALLR(v)        v.rbegin(),v.rend()
#define pii            3.14159265358979323
#define MAX            1000001
int digit(ll n)
{
    ll cnt=0;
    while(n>0)
    {
        cnt++;
        n/=10;
    }
    return cnt;
}
void solve(){
 
    
    ll n,ans=0;
 
    cin>>n;
 
    ll temp=digit(n);
 
    if(temp%2)
    {
        if(temp==1)    ans=n;
        if(temp==3)    ans=n-90;
        if(temp==5)    ans=n-9999+909
    }
    else
    {
        if(temp==2)   ans=9;
        if(temp==4)   ans=909;
        if(temp==6)   ans=90909;
    }
 
    cout<<ans;
 
 
 
}
 
signed main(){
 
    fast;
 
    solve();
 
    return 0;
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:42:38: error: expected ';' before '}' token
   42 |         if(temp==5)    ans=n-9999+909
      |                                      ^
      |                                      ;
   43 |     }
      |     ~
Language: C++

#include<bits/stdc++.h>

using namespace std;

int count(int n) {
	int res = 0;
  	while(n) {
      	res++;
      	n /= 10;
    }
  	return res;
}

int main() {
  	int n;
  	cin >> n;
  	int res = 0;
  	for (int i = 1; i <= n; i++) {
      	res += count(i) % 2);
    }
  	cout << res;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:28: error: expected ';' before ')' token
   19 |         res += count(i) % 2);
      |                            ^
      |                            ;
Language: C++

#include <bits/stdc++.h>
#include <boost/range/algorithm.hpp>
#include <boost/range/numeric.hpp>
#include <boost/integer/common_factor.hpp>

#define rep_ui(k,n)      for(ui  i = (k); i < (n); ++i)
#define rep_si(k,n)      for(int i = (k); i < (n); ++i)
#define rep_ul(k,n)      for(ul  i = (k); i < (n); ++i)
#define rep_sl(k,n)      for(ll  i = (k); i < (n); ++i)
#define rep_ui_down(k,n) for(ui  i = (k); i > (n); --i)
#define rep_si_down(k,n) for(int i = (k); i > (n); --i)
#define rep_ul_down(k,n) for(ul  i = (k); i > (n); --i)
#define rep_sl_down(k,n) for(ll  i = (k); i > (n); --i)

#define rep_uj(k,n)      for(ui  j = (k); j < (n); ++j)
#define rep_sj(k,n)      for(int j = (k); j < (n); ++j)
#define rep_uj_down(k,n) for(ui  j = (k); j > (n); --j)
#define rep_sj_down(k,n) for(int j = (k); j > (n); --j)

#define rep(k,n)         rep_ui(k,n)

typedef uintmax_t    ull;
typedef intmax_t     ll;
typedef uint64_t     ul;
typedef uint32_t     ui;
typedef uint8_t      uc;

template<class T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& vc)
{
#ifdef BOOST_RANGE_ALGORITHM_FOR_EACH_HPP_INCLUDED
  boost::for_each(vc, [&os](T value) {
#else
  std::for_each(vc.begin(), vc.end(), [&os](T value) {
#endif
    os << value << '\n';
    });
  return os;
    }

template<class T1, class T2>
inline
std::ostream & operator<<(std::ostream & os, const std::pair<T1, T2> & p)
{
  return os << p.first << ' ' << p.second;
}

namespace prv
{

template<typename T>
inline constexpr
T pow(T x, T n)
{
  return n ? x * pow(x, n - 1) : 1;
}

template<typename T>
inline constexpr
T log10(T n)
{
  return n / 10 ? 1 + log10(n / 10) : 0;
}

template<typename T>
inline constexpr
T log2(T n)
{
  return n ? 1 + log2(n >> 1) : 0;
}

}

void solve(void)
{
  using std::string;
  using std::vector;
  using std::map;
  using std::pair;
  using std::cin;
  //string S{}; std::cin >> S;
  ui N{}; cin >> N;
  auto K = prv::log10(N);
  assert(K <= 5);

  ull ans = K % 2 ? 0 : (N - prv::pow(10U, K) + 1);
  rep_sl_down(K - 1, -1)
  {
    if (i % 2 == 0)
    {
      ans += 9ULL * prv::pow(10LL, i);
    }
  }

  using std::cout;
  cout << ans << '\n';
  return;
}

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

  solve();

  return 0;
}


Compiler output:
a.cc:2:10: fatal error: boost/range/algorithm.hpp: No such file or directory
    2 | #include <boost/range/algorithm.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int keta = static_cast<int>(log10(n));
    int amari = n % static_cast<int>(pow(10, keta));
    int sum = 0;

    for (int i = 0; i < keta; i++)
    {
        if (i % 2 == 0)
            sum += pow(10, i) * 9;
    }
    
    if(keta ==0)
        cout << n;
    else if(keta % 2 == 0)
       cout << sum +ama+1;
    else if(keta% 2 == 1)
       cout << sum;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:21: error: 'ama' was not declared in this scope; did you mean 'fma'?
   21 |        cout << sum +ama+1;
      |                     ^~~
      |                     fma
Language: C++

#include <iostream>
using namespace std;
#include <cmath>
 
int main (){
int i, x, n = 0;
  cin  >> x;
  for (i = 0; i <= 6; i = i + 2){
    if((x /(pow(10,i)) > 0){
      if ((x/(pow(10,(i+1))) > 0){
        if(i = 0) n += 9;
        if(i = 2) n += 999;
        if(i = 4) n += 99999;
      }
          else{
            n += (x /(pow(10,i)));
                  }
                  }
                  }
                  cout << n ;
                  return 0;
                  }

Compiler output:
a.cc: In function 'int main()':
a.cc:9:28: error: expected ')' before '{' token
    9 |     if((x /(pow(10,i)) > 0){
      |       ~                    ^
      |                            )
a.cc:19:19: error: expected primary-expression before '}' token
   19 |                   }
      |                   ^
Language: C

#include <stdio.h>
 
int main(void){
  int number,save=1;
  int digit = 0;
  int cn=0;
  scanf("%d",&input);
 
  for(save=1;save > input ; save++){
    digit = 0;
 	number = save;
  
  	while(number != 0){
    	number = number / 10;
    	digit++;
  	}
  	if((digit+1) % 2 ==0){
    	cn++;
  	}
  }
  
  printf("%d\n",cn);
  
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:7:15: error: 'input' undeclared (first use in this function); did you mean 'int'?
    7 |   scanf("%d",&input);
      |               ^~~~~
      |               int
main.c:7:15: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
 
int main(void){
  int number,save=1;
  int digit = 0;
  int cn=0;
  scanf("%d",&input);
 
  do{
    digit = 0;
 	number = save;
  
  while(number != 0){
    number = number / 10;
    digit++;
  }
  if( (digit+1) % 2 ==0){
    cn++;
  }
    save++;
  }while(input != save -1);
  
  printf("%d\n",cn);
  
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:7:15: error: 'input' undeclared (first use in this function); did you mean 'int'?
    7 |   scanf("%d",&input);
      |               ^~~~~
      |               int
main.c:7:15: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  
  int N,count;
  cin >> N;
  for (int i=0; i < 5; i += 2){
    
  if (N >= pow(10, i+1)) count +=  pow(10, i+1) - pow(10, i);
  else{
    if (N >= pow(10, i)) count += N - pow(10, i) + 1;
  }

  
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:2: error: expected '}' at end of input
   17 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main (){
int i, x, n = 0;
  cin  >> x;
  for (i = 0; i <= 6; i = i + 2){
    if((x /(pow(10,i)) > 0){
      if ((x/(pow(10,(i+1))) > 0){
        if(i = 0) n += 9;
        if(i = 2) n += 999;
        if(i = 4) n += 99999;
      }
          else{
            n += (x /(pow(10,i));
                  }
                  }
                  }
                  cout << n ;
                  return 0;
                  }
          

Compiler output:
a.cc: In function 'int main()':
a.cc:9:28: error: expected ')' before '{' token
    9 |     if((x /(pow(10,i)) > 0){
      |       ~                    ^
      |                            )
a.cc:19:19: error: expected primary-expression before '}' token
   19 |                   }
      |                   ^
Language: Java

import java.util.Scanner;

public class ABC136b{
	public static void main(String arge[]){
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		// 1 <= N <= 100000
		int printNum = 0;
		int ketasuu = cheackKetasuu(N);
		if(ketasuu == 1 ){
			printNum = N;
		}else if(ketasuu == 2){
			printNum = 9;
		}else if(ketasuu == 3){
			printNum = 9 + N -99;
		}else if(ketasuu == 4){
			printNum = 9 + 900;
		}else if(ketasuu == 5){
			printNum = 9 + 900 + N - 99999;
		}else if(ketasuu == 6){
			printNum = 9 + 900 + 90000;
		}
		// System.out.println(ketasuu);
		System.out.println(printNum);

	}

	public static int cheackKetasuu(int N){
		int ketasuu = 0;
		int count = 6;
		for(int i = 100000;1 <= i;i /=10){
			if(1 <= N / i){
				ketasuu = count;
				break;
			}
			count --;
		}
		return ketasuu;
	}
}

Compiler output:
Main.java:3: error: class ABC136b is public, should be declared in a file named ABC136b.java
public class ABC136b{
       ^
1 error
Language: C++

#include <iostream>
#include <vector>
#include <utility>
#include <map>
#include <algorithm>
#include <queue>
#include <cmath>

using namespace std;
int a;
int count = 0;
int main() {
	cin >> a ;
  for (int i = 1; i <= a; i++) {
    if (to_string(i).size() % 2 == 1)
      count++;
  }
  cout << count << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:7: error: reference to 'count' is ambiguous
   16 |       count++;
      |       ^~~~~
In file included from /usr/include/c++/14/algorithm:86,
                 from a.cc:5:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:101:1: note: candidates are: 'template<class _ExecutionPolicy, class _ForwardIterator, class _Tp> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, typename std::iterator_traits<_II>::difference_type> std::count(_ExecutionPolicy&&, _ForwardIterator, _ForwardIterator, const _Tp&)'
  101 | count(_ExecutionPolicy&& __exec, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value);
      | ^~~~~
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:4025:5: note:                 'template<class _IIter, class _Tp> typename std::iterator_traits< <template-parameter-1-1> >::difference_type std::count(_IIter, _IIter, const _Tp&)'
 4025 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
      |     ^~~~~
a.cc:11:5: note:                 'int count'
   11 | int count = 0;
      |     ^~~~~
a.cc:18:11: error: reference to 'count' is ambiguous
   18 |   cout << count << endl;
      |           ^~~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:101:1: note: candidates are: 'template<class _ExecutionPolicy, class _ForwardIterator, class _Tp> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, typename std::iterator_traits<_II>::difference_type> std::count(_ExecutionPolicy&&, _ForwardIterator, _ForwardIterator, const _Tp&)'
  101 | count(_ExecutionPolicy&& __exec, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value);
      | ^~~~~
/usr/include/c++/14/bits/stl_algo.h:4025:5: note:                 'template<class _IIter, class _Tp> typename std::iterator_traits< <template-parameter-1-1> >::difference_type std::count(_IIter, _IIter, const _Tp&)'
 4025 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
      |     ^~~~~
a.cc:11:5: note:                 'int count'
   11 | int count = 0;
      |     ^~~~~
Language: C++

#include <bits/stdc++.h> 
using namespace std; 
 
int countOddSquares(int n) 
{ 
return (int)pow(n-1,0.5);
} 
 
// Driver code 
int main() 
{ 
	int n;
  cin>>n;
	cout << "Count is " << countOddSquares(n, m); 
	return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:51: error: 'm' was not declared in this scope
   14 |         cout << "Count is " << countOddSquares(n, m);
      |                                                   ^
Language: C++

#include <bits/stdc++.h> 
using namespace std; 
 
int countOddSquares(int n) 
{ 
return (int)pow(n-1,0.5);
} 
 
// Driver code 
int main() 
{ 
	int n;
  cin>>n;
	cout  << countOddSquares(n); 
	return 0; 

Compiler output:
a.cc: In function 'int main()':
a.cc:15:18: error: expected '}' at end of input
   15 |         return 0;
      |                  ^
a.cc:11:1: note: to match this '{'
   11 | {
      | ^
Language: C++


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

int countOddSquares(int n) 
{ 
return (int)pow(n-1,0.5);
} 

// Driver code 
int main() 
{ 
	int n;
  cin>>n;
	cout << "Count is " << countOddSquares(n, m); 
	return 0; 
} 


Compiler output:
a.cc: In function 'int main()':
a.cc:15:51: error: 'm' was not declared in this scope
   15 |         cout << "Count is " << countOddSquares(n, m);
      |                                                   ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin>>n;
  if(n<10){
    cout<<n<<'\n';
  }else if(n>=10 && n<100){
    cout<<9<<'\n';
  }else if(n>=100 && n<1000){
    cout<<n-90+<<'\n';
  }else if(n>=1000 && n<10000){
    cout<<909<<'\n';
  }else if(n>=10000 && n<100000){
    cout<<n-9090<<'\n';
  }else if(n==100000){
    cout<<90909<<'\n';
  }
 return(0);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:16: error: expected primary-expression before '<<' token
   11 |     cout<<n-90+<<'\n';
      |                ^~
Language: C

#include <stdio.h>
 
int main(void)
{
  /* 変数の宣言 */
  int number,save=1;
  int digit = 0;
  int cn=0;
  scanf("%d",&input);
 
  do{
    digit = 0;
 number = save;
  /* 桁数を計算 */
  while(number!=0){
    number = number / 10;
    digit++;
  }
 
  /* 数値の桁数を表示 */
  if(digit+1 %2 ==0){
    cn++;
  }
    save++;
  }while(input!= save -1);
 printf("%d\n",cn);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:9:15: error: 'input' undeclared (first use in this function); did you mean 'int'?
    9 |   scanf("%d",&input);
      |               ^~~~~
      |               int
main.c:9:15: note: each undeclared identifier is reported only once for each function it appears in
Language: Java

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    int n = scan.nextInt();
    scan.close();
    
    int count = 0;
    for(int i = 1; i <= n; i++) {
      String len = String.valueOf(i).length();
      if(len % 2 == 1) count++;
    }
    System.out.println(count);
  }
}

Compiler output:
Main.java:11: error: incompatible types: int cannot be converted to String
      String len = String.valueOf(i).length();
                                           ^
Main.java:12: error: bad operand types for binary operator '%'
      if(len % 2 == 1) count++;
             ^
  first type:  String
  second type: int
2 errors