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

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

#define int long long

#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,a,b) for(int i=(a);i<(b);i++)
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()
#define fi first
#define se second

using vint=vector<int>;
using pint=pair<int,int>;
using vpint=vector<pint>;

template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

template<class A,class B>
ostream& operator<<(ostream& ost,const pair<A,B>&p){
	ost<<"{"<<p.first<<","<<p.second<<"}";
	return ost;
}

template<class T>
ostream& operator<<(ostream& ost,const vector<T>&v){
	ost<<"{";
	for(int i=0;i<v.size();i++){
		if(i)ost<<",";
		ost<<v[i];
	}
	ost<<"}";
	return ost;
}

signed main(){
	int n;
	cin>>n;
	int ans=0;
	for(int i=1;i<=n;i++){
		stringstram ss;
		ss<<i;
		if(ss.str().size()&1)ans++;
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:17: error: 'stringstram' was not declared in this scope
   43 |                 stringstram ss;
      |                 ^~~~~~~~~~~
a.cc:44:17: error: 'ss' was not declared in this scope; did you mean 'se'?
   44 |                 ss<<i;
      |                 ^~
      |                 se
Language: C++

int main() {
  int n;
  cin >> n;
  if (1 <= n && n <= 9) cout << n;
  if (10 <= n && n <= 99) cout << 9;
  if (100 <= n && n <= 999) cout << 9 + (n - 99);
  if (1000 <= n && n <= 9999) cout << 9 + 900;
  if (10000 <= n && n <= 99999) cout << 9 + 899 + (n - 9999);
  if (n == 100000) cout << 90909;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'cin' was not declared in this scope
    3 |   cin >> n;
      |   ^~~
a.cc:4:25: error: 'cout' was not declared in this scope
    4 |   if (1 <= n && n <= 9) cout << n;
      |                         ^~~~
a.cc:5:27: error: 'cout' was not declared in this scope
    5 |   if (10 <= n && n <= 99) cout << 9;
      |                           ^~~~
a.cc:6:29: error: 'cout' was not declared in this scope
    6 |   if (100 <= n && n <= 999) cout << 9 + (n - 99);
      |                             ^~~~
a.cc:7:31: error: 'cout' was not declared in this scope
    7 |   if (1000 <= n && n <= 9999) cout << 9 + 900;
      |                               ^~~~
a.cc:8:33: error: 'cout' was not declared in this scope
    8 |   if (10000 <= n && n <= 99999) cout << 9 + 899 + (n - 9999);
      |                                 ^~~~
a.cc:9:20: error: 'cout' was not declared in this scope
    9 |   if (n == 100000) cout << 90909;
      |                    ^~~~
Language: C++

#include <iostream>
#include <cmath>
using namespace std;
int main(){
  int i=0, a, n;
  cin >> n;
  a=n
  for(; a>0; a/=10)
    i++;
  cout << n+1-pow(10, i-1)<<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: expected ';' before 'for'
    7 |   a=n
      |      ^
      |      ;
    8 |   for(; a>0; a/=10)
      |   ~~~ 
a.cc:8:19: error: expected ';' before ')' token
    8 |   for(; a>0; a/=10)
      |                   ^
      |                   ;
Language: C++

#include <bits/stdc++.h>

using namespace std;

bool check(int n){
  int cc = 0;
  while(n){
    n = n/10;
    cc++;
  }
  return cc%2 == 1;
}

int main(){
  int n;
  cin >> n;
  int cnt = 0;
  for(int i = 1; i <= n; i++)
    if( check(i) )
      cnt ++;
  
  cout << cnt << endl;
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:23:12: error: expected '}' at end of input
   23 |   return 0;
      |            ^
a.cc:14:11: note: to match this '{'
   14 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;

int main(){
    int n;
    cin >> n;
    if(1 <= n && n <= 9){
        cout << n << endl;
    }else if(10 <= n && n <= 99){
        cout << 9 << endl;
    }else if(100 <= n && n <= 999){
        cot << 9 + n - 100 + 1 << endl;
    }else if(1000 <= n && n <= 9999){
        cout << 9 + 900 << endl;
    }else if(10000 <= n && 99999){
        cout << 909 + n - 10000 + 1 << endl;
    }else if(n == 100000){
        cout << 90909 << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'cot' was not declared in this scope
   12 |         cot << 9 + n - 100 + 1 << endl;
      |         ^~~
Language: C++

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

int main(){
  int count=0;
  int N;
  cin>>N;
  for(int i=0;i<N;i++){
    if((log10(i)+1)%2){
      count++;
    }
  }
  cout<<count;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:20: error: invalid operands of types '__gnu_cxx::__enable_if<true, double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   10 |     if((log10(i)+1)%2){
      |        ~~~~~~~~~~~~^~
      |                 |   |
      |                 |   int
      |                 __gnu_cxx::__enable_if<true, double>::__type {aka double}
Language: C++

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

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  
  int n;
	cin >> n;
	int count = 0;
	auto f = [&](int c) {
		int digit = 0;
		while(c > 0) {
			c = c / 10;
			digit++;
		}
		return digit;
	};
	for(int i = 1; i <= n; i++) {
		if(f(i) % 2 != 0) {
			count++;
		}
	}
	cout << count << endl
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:30: error: expected ';' before '}' token
   24 |         cout << count << endl
      |                              ^
      |                              ;
   25 | }
      | ~
Language: C++

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

int main() {
  int N,ans;
  cin >> N;
  for (int j=0 ; j<N ; j++){
  	for (int i=1 ; true ; i++){
  		N/=10;
    	if (N>0)
    		continue;
    			if (i%2==1){
      			ans++:
        		N--;
       			break;
        		}
    }
  }    
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:30: error: expected ';' before ':' token
   13 |                         ans++:
      |                              ^
      |                              ;
Language: C++

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

int main() {
  int N,ans;
  cin >> N;
  for (int j=0 ; j<N ; j++){
  	for (int i=1 ; true ; i++){
  		N/=10
    	if (N>0)
    		continue;
    			if (i%2==1){
      			answer++:
        		N--;
       			break;
        		}
    }
  }    
  cout << answer << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:22: error: expected ';' before 'if'
    9 |                 N/=10
      |                      ^
      |                      ;
   10 |         if (N>0)
      |         ~~            
a.cc:13:25: error: 'answer' was not declared in this scope
   13 |                         answer++:
      |                         ^~~~~~
a.cc:19:11: error: 'answer' was not declared in this scope
   19 |   cout << answer << endl;
      |           ^~~~~~
Language: Java

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int odd = 0;
		String tmp = null;

		for (int i = 1; i <= N; i++) {
			tmp = String.valueOf(i);
			if (tmp.length() % 2 != 0) {
				odd++;
			}
		}
		System.out.println(odd);
		sc.close();
	}
}

Compiler output:
Main.java:3: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class Main
Main.java:3: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		                 ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: Java

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int odd = 0;
		String tmp;

		for (int i = 1; i <= N; i++) {
			tmp = String.valueOf(i);
			if (tmp.length() % 2 != 0) {
				odd++;
			}
		}
		System.out.println(odd);
		sc.close();
	}
}

Compiler output:
Main.java:3: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class Main
Main.java:3: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		                 ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

#include <iostream>

int main()
{
  int n;
  int r=0;
  std::cin >> n;

for (int x=1; x <= n; ++x){
  if (0 < x && 10 > x ||
    99 < x && 1000 > x ||
    9999 < x && 10000 > x
    999999 < x && 1000000 > x ||
    ){
    r++;
  }
}

std::cout << r << std::endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:26: error: expected ')' before numeric constant
   12 |     9999 < x && 10000 > x
      |                          ^
      |                          )
   13 |     999999 < x && 1000000 > x ||
      |     ~~~~~~                
a.cc:10:6: note: to match this '('
   10 |   if (0 < x && 10 > x ||
      |      ^
Language: C++

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

int main(){
    int n, ans = 0;
    cin >> n;

    for(int i = 1; i <= n; ++i){
        if((string)n.length() % 2 == 1)  ++ans;
    }

    cout << ans << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:22: error: request for member 'length' in 'n', which is of non-class type 'int'
   11 |         if((string)n.length() % 2 == 1)  ++ans;
      |                      ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int N,sum=0;
  cin>>N;
  for(int i=1;i<=N;i++){
    int X=to_string(i);
    if(X.zize()%2==1)
      sum++;
    }
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int' in initialization
    7 |     int X=to_string(i);
      |           ~~~~~~~~~^~~
      |                    |
      |                    std::string {aka std::__cxx11::basic_string<char>}
a.cc:8:10: error: request for member 'zize' in 'X', which is of non-class type 'int'
    8 |     if(X.zize()%2==1)
      |          ^~~~
Language: C++

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

int main(){
  int a,ans;
  cin >> a;
  if(a<10){
    ans=a;
  }else if(a>=10 && a<100){
    ans=9;
  }else if(a>=100 && a<1000){
    ans=a-90;
  }else if(a>=1000 && a<10000){
    ans=909;
  }else if(a>=10000 && a<100000){
    ans=a-9900;
  }else{
    ans=9091;
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:2: error: expected '}' at end of input
   20 | }
      |  ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int gcd(int a, int b) {  
  return b != 0 ? gcd(b, a % b) : a;
}//MAX
int lcm(int a, int b) { 
   return a * b / gcd(a, b);
   }
//MIN

 main() {
   ll ans = 0;
   int n;
   cin >> n;
   for(int i=1;i<=n;i++){
     int z = i;
    string s= to_string(z);
    if(s.size()%2!=0){
      ans++;
    }
   }
   cout << ans << endl;
}


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

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:17:2: error: expected '}' at end of input
   17 | }
      |  ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C

#include<stdio.h>
int main(){
  int n, i;
  i = 0;
  scanf("%d", &n);
  if(n<10){
    do{
      i = i + 1;
    }while(n = i);
      printf("%d",i);
  }
  else if(n<100){
    do{
      i = i + 1;
    }while(n-100 = i);
      printf("%d",i);
  }
  else if(n<10000){
    do{
      i = i + 1;
    }while(n-10000 = i);
      printf("%d",i);
  }
  return 0;
}
    
      

Compiler output:
main.c: In function 'main':
main.c:15:18: error: lvalue required as left operand of assignment
   15 |     }while(n-100 = i);
      |                  ^
main.c:21:20: error: lvalue required as left operand of assignment
   21 |     }while(n-10000 = i);
      |                    ^
Language: C

#include<stdio.h>
int main(){
  int n, i;
  i = 0;
  scanf("%d", &n);
  if(n<10){
    do{
      i = i + 1
    }while(i = n)
      printf("%d",i);
  }
  else if(n<100){
    do{
      i = i + 1
    }while(i = n-100)
      printf("%d",i);
  }
  else if(n<10000){
    do{
      i = i + 1
    }while(i = n-10000)
      printf("%d",i);
  }
  return 0;
}
    
      

Compiler output:
main.c: In function 'main':
main.c:8:16: error: expected ';' before '}' token
    8 |       i = i + 1
      |                ^
      |                ;
    9 |     }while(i = n)
      |     ~           
main.c:9:18: error: expected ';' before 'printf'
    9 |     }while(i = n)
      |                  ^
      |                  ;
   10 |       printf("%d",i);
      |       ~~~~~~      
main.c:14:16: error: expected ';' before '}' token
   14 |       i = i + 1
      |                ^
      |                ;
   15 |     }while(i = n-100)
      |     ~           
main.c:15:22: error: expected ';' before 'printf'
   15 |     }while(i = n-100)
      |                      ^
      |                      ;
   16 |       printf("%d",i);
      |       ~~~~~~          
main.c:20:16: error: expected ';' before '}' token
   20 |       i = i + 1
      |                ^
      |                ;
   21 |     }while(i = n-10000)
      |     ~           
main.c:21:24: error: expected ';' before 'printf'
   21 |     }while(i = n-10000)
      |                        ^
      |                        ;
   22 |       printf("%d",i);
      |       ~~~~~~
Language: C

#include<stdio.h>

int main{
  int n;
  scanf("%d",&n);
  int x=10, ans=0;
  while(n >= x){
    ans += x - x/10;
    x *= 100;
  }
  ans += n - (x/10)+1;
  printf("%d",ans);
  
  return 0;
}


Compiler output:
main.c:3:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    3 | int main{
      |         ^
Language: C

#include<stdio.h>

int main{
  int n;
  scanf("%d",&n);
  int x=10, ans=0;
  while(n >= x){
    ans += x - x/10;
    x *= 100;
  }
  ans += n % (x/10)+1;
  printf("%d",ans);
  
  return 0;
}

Compiler output:
main.c:3:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    3 | int main{
      |         ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:16: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    9 |     string s = i;
      |                ^
a.cc:10:31: error: no 'operator++(int)' declared for postfix '++' [-fpermissive]
   10 |     if(s.size() % 2 == 1) cout++;
      |                           ~~~~^~
Language: C++

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

int main() {
    int N;
    cin >> N;
    int res = 0:
    for(int i = 1; i <= N; i++) {
        string s = to_string(i);
        if(s.size() % 2 == 1) res++;
    }
    cout << res << endl;
    return 0;
}

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

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
	int N, i;
	int ans = 0;
	char a[10];
	int len;
	scanf("%d", &N);

	for (i = 1; i <= N; i++) {
		itoa( i, a, 10);
		if (strlen(a) % 2 == 1) {
			ans++;
		}
	}

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

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:17: error: 'itoa' was not declared in this scope
   12 |                 itoa( i, a, 10);
      |                 ^~~~
Language: C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
	int N, i;
	int ans = 0;
	char a[10];
	int len;
	scanf("%d", &N);

	for (i = 1; i <= N; i++) {
		itoa( i, a, 10);
		if (strlen(a) % 2 == 1) {
			ans++;
		}
	}

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

	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:17: error: implicit declaration of function 'itoa' [-Wimplicit-function-declaration]
   12 |                 itoa( i, a, 10);
      |                 ^~~~
Language: C

#include <stdio.h>
int main(){
  int n;
  scanf("%d",&n);
  int a;
  if (n<10){a=n;}
  else if (n<100) {a=9;}
  else if (n<1000) {a=n-90;}
  else if (n<10000) {a=909;}
  else if (n<100000) {a=n-9090;}
  else{a=90909;}
  print("%d",a);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:3: error: implicit declaration of function 'print'; did you mean 'printf'? [-Wimplicit-function-declaration]
   12 |   print("%d",a);
      |   ^~~~~
      |   printf
Language: C

#include <stdio.h>
int main(){
  int n;
  scanf("%d",&n);
  int a;
  if (n<10){a=n;}
  else if (n<100) {a=9;}
  else if (n<1000) {a=n-90;}
  else if (n<10000) {a=909;}
  else if (n<100000) {a=n-9090;}
  else{a=90909;}
  print("%d",a);
}

Compiler output:
main.c: In function 'main':
main.c:12:3: error: implicit declaration of function 'print'; did you mean 'printf'? [-Wimplicit-function-declaration]
   12 |   print("%d",a);
      |   ^~~~~
      |   printf
Language: C

#include<stdio.h>
int main()
{
int n,i,digit=1,sum=0;
save_n=n;
for(i=0;n/10;i++)
digit++;

n=save_n;
for(i=1;i<digit;i=i+2)
{
sum=sum+pow(9,i);
}
if(digit%2==1)
sum=sum+n-pow(10,digit)+1;

return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:1: error: 'save_n' undeclared (first use in this function)
    5 | save_n=n;
      | ^~~~~~
main.c:5:1: note: each undeclared identifier is reported only once for each function it appears in
main.c:12:9: error: implicit declaration of function 'pow' [-Wimplicit-function-declaration]
   12 | sum=sum+pow(9,i);
      |         ^~~
main.c:2:1: note: include '<math.h>' or provide a declaration of 'pow'
    1 | #include<stdio.h>
  +++ |+#include <math.h>
    2 | int main()
main.c:12:9: warning: incompatible implicit declaration of built-in function 'pow' [-Wbuiltin-declaration-mismatch]
   12 | sum=sum+pow(9,i);
      |         ^~~
main.c:12:9: note: include '<math.h>' or provide a declaration of 'pow'
main.c:15:11: warning: incompatible implicit declaration of built-in function 'pow' [-Wbuiltin-declaration-mismatch]
   15 | sum=sum+n-pow(10,digit)+1;
      |           ^~~
main.c:15:11: note: include '<math.h>' or provide a declaration of 'pow'
Language: C++

#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<cmath>
#include<tuple>
#include<string>
typedef long long int ll;
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define F first
#define S second
using namespace std;
const ll INF = 10000000000000;

int main() {
  int n;
  int ans=0;
  cin>>n;
  if(n<10)sum+=n;
  else if(n>=100&&n<1000)sum+=9+n-100;
  else if(n>=10000&&n<100000)sum+=9+900+n-10000;
  cout<<sum<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:11: error: 'sum' was not declared in this scope
   19 |   if(n<10)sum+=n;
      |           ^~~
a.cc:20:26: error: 'sum' was not declared in this scope
   20 |   else if(n>=100&&n<1000)sum+=9+n-100;
      |                          ^~~
a.cc:21:30: error: 'sum' was not declared in this scope
   21 |   else if(n>=10000&&n<100000)sum+=9+900+n-10000;
      |                              ^~~
a.cc:22:9: error: 'sum' was not declared in this scope
   22 |   cout<<sum<<endl;
      |         ^~~
Language: C++

#include<bits/stdc++.h>
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
#define elif else if
#define INF 1000000007
using namespace std;
int a,b,aa[110000],cnt=0;
string s,ss;
signed main()
{
	cin>>a;
	rep(i,a){
		if((i+1)/10=0||((i+1)/100>=1&&(i+1)/1000==0)||((i+1)/10000>=1&&(i+1)/100000==0)){
			cnt++;
		}
	}
	cout<<cnt;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:25: error: lvalue required as left operand of assignment
   13 |                 if((i+1)/10=0||((i+1)/100>=1&&(i+1)/1000==0)||((i+1)/10000>=1&&(i+1)/100000==0)){
      |                    ~~~~~^~~
Language: C++

#include<bits/stdc++.h>
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
#define elif else if
#define INF 1000000007
using namespace std;
int a,b,aa[110000],cnt=0;
string s,ss;
signed main()
{
	cin>>a;
	rep(i,a){
		if((i+1)/10=0||((i+1)/100>=1&&(i+1)/1000=0)||((i+1)/10000>=1&&(i+1)/100000=0)){
			cnt++;
		}
	}
	cout<<cnt;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:45: error: lvalue required as left operand of assignment
   13 |                 if((i+1)/10=0||((i+1)/100>=1&&(i+1)/1000=0)||((i+1)/10000>=1&&(i+1)/100000=0)){
      |                                 ~~~~~~~~~~~~^~~~~~~~~~~~
a.cc:13:77: error: lvalue required as left operand of assignment
   13 |                 if((i+1)/10=0||((i+1)/100>=1&&(i+1)/1000=0)||((i+1)/10000>=1&&(i+1)/100000=0)){
      |                                                               ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
Language: C++

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
 char n[100],m[100];
 int ans;
 scanf("%s",n);
 strcpy(m,n);
 for(int i = 1;i <= atoi(n);i++)
 {
  itoa(i,m,10);
  if(strlen(m) % 2 == 1)
   ans++;
}
 printf("%d\n",ans);
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'itoa' was not declared in this scope
   12 |   itoa(i,m,10);
      |   ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  int number=0;
  for (int i = 1;i < N+1; i++){
    int count = 0;
    int number = i
    while(number != 0){
    	number /= 10;
    	count ++;
  	}
    if (count % 2 == 1){
      number++;
    }
  }
  cout << number << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: expected ',' or ';' before 'while'
   10 |     while(number != 0){
      |     ^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  int number=0;
  for (int i = 1;i < N+1; i++){
    int count = 0;
    while(N != 0){
    	N /= 10;
    	count ++;
  	}
    if (count % 2 == 1){
      number++;
    }
      
  cout << number << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:2: error: expected '}' at end of input
   18 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <iostream>
#include <cmath>
int main(){
  int N,ans=0,digit=0;
  std::cin>>N;
  int temp=N;
  while(temp!=0){
    temp/=10;
    digit++;
  }
  for(i=1;i<=digit;i++){
    if(i!=digit){
      if(i%2==1){
        ans+=std::pow(10,i-1)*9;
      }
  	}else{
      if(i%2==1){
        ans+=N-std::pow(10,i-1)+1;
      }
    }
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:7: error: 'i' was not declared in this scope
   11 |   for(i=1;i<=digit;i++){
      |       ^
Language: C++

#include <iostream>
int main(){
  int N,ans=0,digit=0;
  std::cin>>N;
  int temp=N;
  while(temp!=0){
    temp/=10;
    digit++;
  }
  for(i=1;i<=digit;i++){
    if(i!=digit){
      if(i%2==1){
        ans+=std::pow(10,i-1)*9;
      }
  	}else{
      if(i%2==1){
        ans+=N-std::pow(10,i-1)+1;
      }
    }
  }
    

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: 'i' was not declared in this scope
   10 |   for(i=1;i<=digit;i++){
      |       ^
a.cc:13:19: error: 'pow' is not a member of 'std'
   13 |         ans+=std::pow(10,i-1)*9;
      |                   ^~~
a.cc:17:21: error: 'pow' is not a member of 'std'
   17 |         ans+=N-std::pow(10,i-1)+1;
      |                     ^~~
a.cc:20:4: error: expected '}' at end of input
   20 |   }
      |    ^
a.cc:2:11: note: to match this '{'
    2 | int main(){
      |           ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  int a;
  int count = 0;

  for(int i = 0; i < N; i++){
      if(N < 10){
          count = N;
      }
      if(N >= 10 && N < 100){
          count = 9;
      }
      if(N >= 100 && N < 1000){
          count = N - 90;
      }
      if(N >= 1000 && N < 10000){
          count = N - 90;
      }
      if(N >= 10000 && N < 100000){
          count = N - 9090;
      }
      if(N >= 100000 && N < 1000000){
          count = N - 9091;
      }
      if(N == 1000000){
          count = N - 9092
      }
    }
    cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:27: error: expected ';' before '}' token
   30 |           count = N - 9092
      |                           ^
      |                           ;
   31 |       }
      |       ~
Language: C++

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

int main() {
  int N;
  cin >> N;
  int a;
  int count = 0;

  for(int i = 0; i < N; i++){
      if(N < 10){
          count = N;
      }
      if(N >= 10 && N < 100){
          count = 9;
      }a
      if(N >= 100 && N < 1000){
          count = N - 90;
      }
      if(N >= 1000 && N < 10000){
          count = N - 90;
      }
      if(N >= 10000 && N < 100000){
          count = N - 9090;
      }
      if(N >= 100000 && N < 1000000){
          count = N - 9091;
      }
    }
    cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:9: error: expected ';' before 'if'
   16 |       }a
      |         ^
      |         ;
   17 |       if(N >= 100 && N < 1000){
      |       ~~
Language: C++

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

int main() {
  int N;
  cin >> N;
  int a;
  int count = 0;

  for(int i = 0; i < N; i++){
      a = N;
      if(a % 2 == 1){
        count++;
        n -= 1;
      }
    }
    cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: 'n' was not declared in this scope
   14 |         n -= 1;
      |         ^
Language: C++

#include<iostream>
using namespace std;
int dig(int n)
{
  int count=0;
  while(n!=0)
  {
    count+=1;
    n/=10;
  }
  return count;
}
int main()
{
  int n;
  int count=0;
  std::cin>>n;
  for(i=1;i<=n;i++)
  {
    if(dig(i)%2!=0)
      count+=1;
  }
  std::cout<<count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:7: error: 'i' was not declared in this scope
   18 |   for(i=1;i<=n;i++)
      |       ^
Language: C++

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

typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define rep(i, n) REP(i, 0, n)
#define ALL(v) v.begin(), v.end()
#define MSG(a) cout << #a << " " << a << endl;
#define REP(i, x, n) for(int i = x; i < n; i++)

int shisu(int &a,int b){
  if (b==0) return a;
  else{rep(i,b) a*=10;
  return a;
  }
}
int main() {
  int n,j,ans;
  cin >> n;
  j=0;
  REP(i,1,n+1){
    if (i==shisu(1,j)){
        ans+=shisu(9,j);
        j+=2;
        i=shisu(1,j);
     }
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:18: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   24 |     if (i==shisu(1,j)){
      |                  ^
a.cc:13:16: note:   initializing argument 1 of 'int shisu(int&, int)'
   13 | int shisu(int &a,int b){
      |           ~~~~~^
a.cc:25:20: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   25 |         ans+=shisu(9,j);
      |                    ^
a.cc:13:16: note:   initializing argument 1 of 'int shisu(int&, int)'
   13 | int shisu(int &a,int b){
      |           ~~~~~^
a.cc:27:17: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   27 |         i=shisu(1,j);
      |                 ^
a.cc:13:16: note:   initializing argument 1 of 'int shisu(int&, int)'
   13 | int shisu(int &a,int b){
      |           ~~~~~^
Language: C++

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

typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define rep(i, n) REP(i, 0, n)
#define ALL(v) v.begin(), v.end()
#define MSG(a) cout << #a << " " << a << endl;
#define REP(i, x, n) for(int i = x; i < n; i++)

int shisu(int &a,int b){
  if (b==0) return a;
  else{rep(i,b) a*=10;
  return a;
  }
}
int main() {
  int n,j,ans;
  cin >> n;
  j=0;
  rep(i,1,n+1){
    if (i==shisu(1,j)){
        ans+=shisu(9,j);
        j+=2;
        i=shisu(1,j);
     }
  }
  return 0;
}


Compiler output:
a.cc:23:14: error: macro "rep" passed 3 arguments, but takes just 2
   23 |   rep(i,1,n+1){
      |              ^
a.cc:8:9: note: macro "rep" defined here
    8 | #define rep(i, n) REP(i, 0, n)
      |         ^~~
a.cc: In function 'int main()':
a.cc:23:3: error: 'rep' was not declared in this scope
   23 |   rep(i,1,n+1){
      |   ^~~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define all(c) c.begin(),c.end()
#define pb push_back
#define fs first
#define sc second
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
using namespace std;
template<class S,class T> ostream& operator<<(ostream& o,const pair<S,T> &p){
	return o<<"("<<p.fs<<","<<p.sc<<")";
}
template<class T> ostream& operator<<(ostream& o,const vector<T> &vc){
	o<<"{";
	for(const T& v:vc) o<<v<<",";
	o<<"}";
	return o;
}
using ll = long long;
template<class T> using V = vector<T>;
template<class T> using VV = vector<vector<T>>;
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n-1); }

#ifdef LOCAL
#define show(x) cerr << "LINE" << __LINE__ << " : " << #x << " = " << (x) << endl
#else
#define show(x) true
#endif

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);		//DON'T USE scanf/printf/puts !!
	cout << fixed << setprecision(20);
	
	int N;
	cin >> N;
	int ans = 0;
	rep1(i,N){
		if(to_string(i).size%2 == 1) ans ++;
	}
	cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:40:33: 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 '()' ?)
   40 |                 if(to_string(i).size%2 == 1) ans ++;
      |                    ~~~~~~~~~~~~~^~~~
      |                                     ()
Language: C++

#include<stdio.h>

int main(void){
  int n;
  scanf("%d",&n);
  if(n<10){
    printf("%d",n);
  }
  else{
    if(n<100){
      printf("9");
    }
    else{
      if(n<1000){
        printf("%d",9+(n-99))
      }
      else{
        if(n<10000){
          printf("909");
        }
        else{
          if(n<100000){
            printf("%d",99+(n-999));
          }
          else{
            printf("90909");
          }
        }
      }
    }
    return 0;
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:15:30: error: expected ';' before '}' token
   15 |         printf("%d",9+(n-99))
      |                              ^
      |                              ;
   16 |       }
      |       ~                       
a.cc:32:4: error: expected '}' at end of input
   32 |   }
      |    ^
a.cc:3:15: note: to match this '{'
    3 | int main(void){
      |               ^
Language: C++

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

int main(){
  int N; cin >> N;
  int count;
  for(int i=1; i<=N; ++i){
    char *s;
    sprintf(s,"%d", N);
    if(strlen(s) % 2 == 1) count++;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:8: error: 'strlen' was not declared in this scope
   12 |     if(strlen(s) % 2 == 1) count++;
      |        ^~~~~~
a.cc:3:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<cstdio>
  +++ |+#include <cstring>
    3 | #include<string>
Language: C++

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

int main(){
  int N; cin >> N;
  int count;
  for(int i=1; i<=N; ++i){
    char *s;
    sprintf(s,"%d", N);
    if(strlen(s) % 2 == 1) count++;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:8: error: 'strlen' was not declared in this scope
   11 |     if(strlen(s) % 2 == 1) count++;
      |        ^~~~~~
a.cc:3:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<cstdio>
  +++ |+#include <cstring>
    3 | using namespace std;
Language: C++

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

int main(){
  int N; cin >> N;
  int count;
  for(int i=1; i<=N; ++i){
    string s;
    sprintf(s,"%d", N);
    if(strlen(s) % 2 == 1) count++;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char*'
   11 |     sprintf(s,"%d", N);
      |             ^
      |             |
      |             std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 from /usr/include/c++/14/bits/basic_string.h:4154,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/stdio.h:365:38: note:   initializing argument 1 of 'int sprintf(char*, const char*, ...)'
  365 | extern int sprintf (char *__restrict __s,
      |                     ~~~~~~~~~~~~~~~~~^~~
a.cc:12:8: error: 'strlen' was not declared in this scope
   12 |     if(strlen(s) % 2 == 1) count++;
      |        ^~~~~~
a.cc:4:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    3 | #include<vector>
  +++ |+#include <cstring>
    4 | using namespace std;
Language: C++

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

int main(){
  int N; cin >> N;
  int count;
  for(int i=1; i<=N; ++i){
    string s;
    sprintf(s,"%d", N)
    if(strlen(s) % 2 == 1) count++;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char*'
   11 |     sprintf(s,"%d", N)
      |             ^
      |             |
      |             std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 from /usr/include/c++/14/bits/basic_string.h:4154,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/stdio.h:365:38: note:   initializing argument 1 of 'int sprintf(char*, const char*, ...)'
  365 | extern int sprintf (char *__restrict __s,
      |                     ~~~~~~~~~~~~~~~~~^~~
Language: C++

#include <algorithm>
#include <iostream>
#include <math.h>
#define ll long long int
#define FOR(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define REP1(i, n) FOR(i, 1, n)

using namespace std;

int main() {
    int n;
    int digit = 0, num = n;
    while (num > 0) {
        digit++;
        num /= 10;
    }
    if (digits >= 5)
        cout << 9 + 900 + (n - 9999) << endl;
    else if (digits >= 3)
        cout << 9 + (n - 99) << endl;
    else if (digits == 2)
        cout << 9 << endl;
    else
        cout << n << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:9: error: 'digits' was not declared in this scope; did you mean 'digit'?
   18 |     if (digits >= 5)
      |         ^~~~~~
      |         digit
Language: C

#include<stdio.h>
int main(void)
{
	int N,i;
	int cnt=0;
	scanf("%d",&N);
	if(N%10==N)
	{
		for(i=0;i<N;i++)
		cnt++;
		printf("%d",cnt);
	}
	if(N==10)
	printf("9");
	if(N%10!=N && N%100==N)
	printf("9");
	if(N==100)
	printf("10");
	if(N%100!=N && N%1000==N)
	{
		for(i=0;i<N-((N/100)*100)+1;i++)
		cnt++;
		printf("%d",cnt+9);
	}
	if(N%1000!=N && N%10000==N)
	printf("909");
	if(N==10000)
	printf("910");
	if(N%10000!=N && N%100000==N)
	{
		for(i=0;i<N=(N/10000)*10000;i++)
		cnt++;
		printf("%d",cnt+909);
	}
	if(N==100000)
	printf("90909");
	return 0;
}


Compiler output:
main.c: In function 'main':
main.c:31:28: error: lvalue required as left operand of assignment
   31 |                 for(i=0;i<N=(N/10000)*10000;i++)
      |                            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    scanf("%d",&n);
    if(n<10)printf("%d",n);
    else if(n<100)printf("9");
    else if(n<1000)printf("%d",n-90);
    else if(n<10000)printf("909");
    else if(n<100000)printf("%d",n-9990);
    else printf("90990");
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: expected '}' at end of input
   12 |     return 0;
      |              ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

# frozen_string_literal: true

n = gets.to_i

count = 0
(1..n).each do |i|
  count += 1 if i.to_s.length.odd?
end

puts count


Compiler output:
a.cc:1:3: error: invalid preprocessing directive #frozen_string_literal
    1 | # frozen_string_literal: true
      |   ^~~~~~~~~~~~~~~~~~~~~
a.cc:6:2: error: too many decimal points in number
    6 | (1..n).each do |i|
      |  ^~~~
a.cc:3:1: error: 'n' does not name a type
    3 | n = gets.to_i
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll= long long;
using vi= vector<int>;
using vvi= vector<vi>;
#define REP(i,x,n) for(int i=x; i<n; i++)
#define rep(i,n) REP(i,0,n)
#define all(x) x.begin(), x.end()

int main(){
  int n,ans=0;
  REP(i,1,n+1){
    t=0;
    while(i!=0){
      i/=10;
      t++;
    }
    if(t%2!=0) ans++;
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: 't' was not declared in this scope
   13 |     t=0;
      |     ^
Language: C++

#include <iostream>
#include <cmath>
using namespace std;
 
int main() {
  int N;
  cin >> N;
  
  int s = 0;
  for (int i = 1; i < N; ++i) {
    if (len(str(i)) % 2 == 1) s+=1;
  }
  
  cout << s << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'str' was not declared in this scope; did you mean 'std'?
   11 |     if (len(str(i)) % 2 == 1) s+=1;
      |             ^~~
      |             std
a.cc:11:9: error: 'len' was not declared in this scope
   11 |     if (len(str(i)) % 2 == 1) s+=1;
      |         ^~~
Language: C++

#include <iostream>
#include <cmath>
using namespace std;
 
int main() {
  int N;
  cin >> N;
  
  int s = 0;
  for (int i=0; i < N; ++i) {
    if (floor(log10(i) + 1) % 2 == 1) s+=1;
  }
   
  cout << s << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:29: error: invalid operands of types 'double' and 'int' to binary 'operator%'
   11 |     if (floor(log10(i) + 1) % 2 == 1) s+=1;
      |         ~~~~~~~~~~~~~~~~~~~ ^ ~
      |              |                |
      |              double           int
Language: C++

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

int main() {
  int N;
  cin >> N;
  
  int s = 0;
  for (int i=0; i < N; ++i) {
    if (floor(log10(i) + 1) % 2 == 1) s+=1;
   
  cout << s << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:29: error: invalid operands of types 'double' and 'int' to binary 'operator%'
   11 |     if (floor(log10(i) + 1) % 2 == 1) s+=1;
      |         ~~~~~~~~~~~~~~~~~~~ ^ ~
      |              |                |
      |              double           int
a.cc:14:2: error: expected '}' at end of input
   14 | }
      |  ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
signed main(){
  int a,b=100,c=0;
  cin>>a;
  if(a>=9)
    c+=9;
  else{
    cout<<a<<endl;
    return(0);
  }
  if(a>=999)
    c+=899;
  else{
    if(9<=a || a<100)
      cout<<a<<endl;
    else{
      c+=a-100;
      cout<<c<<endl;
      return(0);
    }
  }
  if(a>=99999){   
    c+=89999;
    cout<<c<<endl;
    return(0);
  }
  else{
    if(9<=a || a<10000){
      cout<<c<<endl;
    }
    else{
    c+=a-10000;
     cout<<c<<endl;
    return(0);
    }
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:37:4: error: expected '}' at end of input
   37 |   }
      |    ^
a.cc:3:14: note: to match this '{'
    3 | signed main(){
      |              ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  if (N<10){
    cout << N <<endl;
  }
  if(N>=10 && N<100){
    cout << "9" <<endl;
  }
  if(N>=100 && N<1000){
    cout << N-90 <<endl;
  }
  if(N>=1000 && N<10000){
    cout << "909" <<endl;
  }
  if(N>=10000 && N<100000){
    cout << N-9090 <<endl;
  }
  if(N>=100000){
    cout << 90909 <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:2: error: expected '}' at end of input
   24 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  if (N<10){
    int ans;
    ans=N;
  }
  if(N>=10 && N<100){
    int ans;
    ans=9;
  }
  if(N>=100 && N<1000){
    int ans;
    ans=N-90;
  }
  if(N>=1000 && N<10000){
    int ans;
    ans=909;
  }
  if(N>=10000 && N<100000){
    int ans;
    ans=N-9090;
  }
  if(N=100000){
    int ans;
    ans=90909;
  }
  cout << ans <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 |   cout << ans <<endl;
      |           ^~~
      |           abs
Language: C++

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

int main() {
  int N;
  cin >> N;
  if (N<10){
    int ans;
    ans=N;
  }
  if(N>=10 && N<100){
    ans=9;
  }
  if(N>=100 && N<1000){
    ans=N-90;
  }
  if(N>=1000 && N<10000){
    ans=909;
  }
  if(N>=10000 && N<100000){
    ans=N-9090;
  }
  if(N=100000){
    ans=90909;
  }
  cout << ans <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   12 |     ans=9;
      |     ^~~
      |     abs
a.cc:15:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   15 |     ans=N-90;
      |     ^~~
      |     abs
a.cc:18:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   18 |     ans=909;
      |     ^~~
      |     abs
a.cc:21:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   21 |     ans=N-9090;
      |     ^~~
      |     abs
a.cc:24:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   24 |     ans=90909;
      |     ^~~
      |     abs
a.cc:26:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   26 |   cout << ans <<endl;
      |           ^~~
      |           abs
Language: C++

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

int main() {
  int N;
  cin >> N;
  int ans;
  if (N<10){
    ans=N
  }
  if(N>=10 && N<99){
    ans=9
  }
  if(N>=100 && N<999){
    ans=N-90
  }
  if(N>=1000 && N<9999){
    ans=909
  }
  if(N>=10000 && N<99999){
    ans=N-9090
  }
  if(N=100000){
    ans=90909
  }
  cout << ans <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: expected ';' before '}' token
    9 |     ans=N
      |          ^
      |          ;
   10 |   }
      |   ~       
a.cc:12:10: error: expected ';' before '}' token
   12 |     ans=9
      |          ^
      |          ;
   13 |   }
      |   ~       
a.cc:15:13: error: expected ';' before '}' token
   15 |     ans=N-90
      |             ^
      |             ;
   16 |   }
      |   ~          
a.cc:18:12: error: expected ';' before '}' token
   18 |     ans=909
      |            ^
      |            ;
   19 |   }
      |   ~         
a.cc:21:15: error: expected ';' before '}' token
   21 |     ans=N-9090
      |               ^
      |               ;
   22 |   }
      |   ~            
a.cc:24:14: error: expected ';' before '}' token
   24 |     ans=90909
      |              ^
      |              ;
   25 |   }
      |   ~
Language: C++

#define repe(i,a,n) for( int i = a ; i < n ; i++ )
typedef long long ll;
int main(){
  
  int N ,counter = 0 , ans = 0 ;
  cin  >> N ;
  repe(i,1,8) if( N >= pow(10,i) ) counter++ ;
  //cout <<counter << endl;
  repe(i,1,4){
  //cout << i << endl ;
  if( counter >= i*2 - 1 ) ans = ans +  9*pow(10,2*(i-1));
  else {
  if( counter == 1 || counter == 3 ) break; 
  ans = ans + N + 1 - pow( 10,2*(i-1) );
  break;
  }
  }

  cout << ans << endl;
  
  
}


  

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin  >> N ;
      |   ^~~
a.cc:7:24: error: 'pow' was not declared in this scope
    7 |   repe(i,1,8) if( N >= pow(10,i) ) counter++ ;
      |                        ^~~
a.cc:11:43: error: 'pow' was not declared in this scope
   11 |   if( counter >= i*2 - 1 ) ans = ans +  9*pow(10,2*(i-1));
      |                                           ^~~
a.cc:14:23: error: 'pow' was not declared in this scope
   14 |   ans = ans + N + 1 - pow( 10,2*(i-1) );
      |                       ^~~
a.cc:19:3: error: 'cout' was not declared in this scope
   19 |   cout << ans << endl;
      |   ^~~~
a.cc:19:18: error: 'endl' was not declared in this scope
   19 |   cout << ans << endl;
      |                  ^~~~
Language: C++

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

int main() {
  int n;
  cin >>n;
  int total=0;
  if(n <=99&& n>=9){
    total =total+9;
  }
    if(n<=9999&&n >=999){
    total =total+909;
    }
    if(n<= 10000){
      total= total+n-10000;
    }
  if(n<9){
    total = n;
  }
  if(n>=100 &&n<999){
    total= total+9+n-99
  }
  cout <<total <<endl;
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:24: error: expected ';' before '}' token
   21 |     total= total+9+n-99
      |                        ^
      |                        ;
   22 |   }
      |   ~
Language: C++

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

int main() {
  int n;
  cin >>n;
  int total=0;
  if(n <=99%% n>=9){
    total =total+9;
  }
    if(n<=9999%%n >=999){
    total =total+909;
    }
    if(n<= 10000){
      total= total+n-10000;
    }
  if(n<9){
    total = n;
  }
  if(n>=100 %%n<999){
    total= total+9+n-99
  }
  cout <<total <<endl;
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: expected primary-expression before '%' token
    8 |   if(n <=99%% n>=9){
      |             ^
a.cc:11:16: error: expected primary-expression before '%' token
   11 |     if(n<=9999%%n >=999){
      |                ^
a.cc:20:14: error: expected primary-expression before '%' token
   20 |   if(n>=100 %%n<999){
      |              ^
a.cc:21:24: error: expected ';' before '}' token
   21 |     total= total+9+n-99
      |                        ^
      |                        ;
   22 |   }
      |   ~
Language: C++

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

int main () {
  int n, count; cin >> n;
  for (int i=1;i<=n;i++) {
    if (i.size() % 2 == 1) {
      count++;
    }
  }
  cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: request for member 'size' in 'i', which is of non-class type 'int'
    7 |     if (i.size() % 2 == 1) {
      |           ^~~~
Language: C++

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

int main(){
  int N;
  cin >> N;
  
  int counter =0;
  for(int i=1 ; i<N; ++i){
    if((stiring)i.size() % 2 == 1) counter++;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'stiring' was not declared in this scope; did you mean 'stdin'?
   11 |     if((stiring)i.size() % 2 == 1) counter++;
      |         ^~~~~~~
      |         stdin
a.cc:11:17: error: expected ')' before 'i'
   11 |     if((stiring)i.size() % 2 == 1) counter++;
      |       ~         ^
      |                 )