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

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

int main(){
  int count=0;
  char s;
  for(int i=0; i<s.size(); i++){
    cin >> s[i];
  }
  if(s.size()==1){
    cout << 0 << endl;
  }else{
  	for(int i=1; i<n; i++){
    	if(s[i]==s[i-1]){
      		if(s[i-1]=='0'){
        		s[i]='1';
        		count += 1;
      		}else{
        		s[i]='0';
        		count += 1;
    		}
  		}
  	}
  }
  cout << count << endl;
}
      

      


Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: request for member 'size' in 's', which is of non-class type 'char'
    7 |   for(int i=0; i<s.size(); i++){
      |                    ^~~~
a.cc:8:13: error: invalid types 'char[int]' for array subscript
    8 |     cin >> s[i];
      |             ^
a.cc:10:8: error: request for member 'size' in 's', which is of non-class type 'char'
   10 |   if(s.size()==1){
      |        ^~~~
a.cc:13:24: error: 'n' was not declared in this scope
   13 |         for(int i=1; i<n; i++){
      |                        ^
a.cc:14:13: error: invalid types 'char[int]' for array subscript
   14 |         if(s[i]==s[i-1]){
      |             ^
a.cc:14:19: error: invalid types 'char[int]' for array subscript
   14 |         if(s[i]==s[i-1]){
      |                   ^
a.cc:15:21: error: invalid types 'char[int]' for array subscript
   15 |                 if(s[i-1]=='0'){
      |                     ^
a.cc:16:26: error: invalid types 'char[int]' for array subscript
   16 |                         s[i]='1';
      |                          ^
a.cc:19:26: error: invalid types 'char[int]' for array subscript
   19 |                         s[i]='0';
      |                          ^
Language: C++

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

int main(){
  int count=0;
  char s;
  cin >> s;
  	for(int i=1; i<n; i++){
    	if(s[i]==s[i-1]){
      		if(s[i-1]=='0'){
        		s[i]='1';
        		count += 1;
      		}else{
        		s[i]='0';
        		count += 1;
    		}
  		}
  	
  }
  cout << count << endl;
}
      


Compiler output:
a.cc: In function 'int main()':
a.cc:8:24: error: 'n' was not declared in this scope
    8 |         for(int i=1; i<n; i++){
      |                        ^
a.cc:9:13: error: invalid types 'char[int]' for array subscript
    9 |         if(s[i]==s[i-1]){
      |             ^
a.cc:9:19: error: invalid types 'char[int]' for array subscript
    9 |         if(s[i]==s[i-1]){
      |                   ^
a.cc:10:21: error: invalid types 'char[int]' for array subscript
   10 |                 if(s[i-1]=='0'){
      |                     ^
a.cc:11:26: error: invalid types 'char[int]' for array subscript
   11 |                         s[i]='1';
      |                          ^
a.cc:14:26: error: invalid types 'char[int]' for array subscript
   14 |                         s[i]='0';
      |                          ^
Language: C++

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

int main(){
  int n,count=0;
  char s[n];
  cin >> n >> s[n];
  if(n==1){
    cout << 0 << endl;
  }else{
  for(int i=1; i<n; i++){
    if(s[i]==s[i-1]){
      if(s[i-1]=="0"){
        s[i]="1";
        count += 1;
      }else{
        s[i]="0";
        count += 1;
    }
  }
  }
  }
  cout << count << endl;
}
      

Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   13 |       if(s[i-1]=="0"){
      |          ~~~~~~^~~~~
a.cc:14:14: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
   14 |         s[i]="1";
      |              ^~~
      |              |
      |              const char*
a.cc:17:14: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
   17 |         s[i]="0";
      |              ^~~
      |              |
      |              const char*
Language: C++

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

int main(){
  int n,count=0;
  char s[n];
  cin >> n;
  for(int i=0; i<n; i++){
    cin >> s[i];
  }
  if(sn==1){
    cout << 0 << endl;
  }else{
  for(int i=1; i<n; i++){
    if(s[i]==s[i-1]){
      if(s[i-1]=='0'){
        s[i]='1';
        count += 1;
      }else{
        s[i]='0';
        count += 1;
    }
  }
  }
  }
  cout << count << endl;
}
      

Compiler output:
a.cc: In function 'int main()':
a.cc:11:6: error: 'sn' was not declared in this scope; did you mean 's'?
   11 |   if(sn==1){
      |      ^~
      |      s
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;
  cin >> S;
  int N = S.size();
  int A = 0, B = 0;
  
  for (int i = 0; i < N, i++) {
    if (S.at(i) != i%2) {
      A++;
    }
    if (S.at(i) != (i+1)%2) {
      B++;
    }
  }
  int ans = min (A,B);
  cout <<ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:29: error: expected ';' before ')' token
   10 |   for (int i = 0; i < N, i++) {
      |                             ^
      |                             ;
Language: C++

#include <bits/stdc++.h>
#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define mod 1000000007
#define N 1000005
using namespace std;

typedef long long ll;

int n, ans;
char s[N];

int main() {
	// freopen("in.txt", "r", stdin);
	// freopen("out.txt", "w", stdout);
	scanf("%s",s + 1);
	n = strlen(s + 1);
	for(int i = 1; i <= n; i++)
		ans1 += ((s[i] - '0') != i%2);
	printf("%d\n", min(ans, n - ans));
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:17: error: 'ans1' was not declared in this scope; did you mean 'ans'?
   21 |                 ans1 += ((s[i] - '0') != i%2);
      |                 ^~~~
      |                 ans
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(void){
  string S;
  cin >> S;
  int ans = S.length();
  int aa = 0;
  for(int i = 0; i < S.length(); i++){
    if(S[i] - '0' != i % 2) aa++;
  }
  ans = min(ans, aa);
  int aa = 0;
  for(int i = 0; i < S.length(); i++){
    if(S[i] - '0' == i % 2) aa++;
  }
  ans = min(ans, aa);
  cout << ans << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:7: error: redeclaration of 'int aa'
   12 |   int aa = 0;
      |       ^~
a.cc:7:7: note: 'int aa' previously declared here
    7 |   int aa = 0;
      |       ^~
Language: C++

#include <bits/stdc++.h>

int main(int argc, char const *argv[]) {
  string s;
  std::cin >> s;
  int a, b;
  for (size_t i = 0; i < s.size(); i++) {
    /* code */
    if (s.at(i) == 0) {
      if (i % 2 ==1) a++;
      else b++;
    }
    else {
      if (i % 2 ==1) b++;
      else a++;
    }
  }
  std::cout << a <<b<< '\n';
  return 0;
}


Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:4:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:5:15: error: 's' was not declared in this scope
    5 |   std::cin >> s;
      |               ^
Language: C++

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <cstdlib>
#include <utility>
#include <cstdio>
#include <vector>
#include <string>
#include <queue>
#include <stack>
#include <cmath>
#include <set>
#include <map>
using ll = long long;
using itn = int;
using namespace std;
int GCD(int a, int b){
    return b ? GCD(b, a%b) : a;
}


int main{
    string s;
    cin >>s;
    int p=0;
    for(int i=0;i<s.size()-1;i++){
        if(s[i]==s[i+1]){
            p+=1;
            if(s[i+1]=='0') s[i+1]='1';
            else s[i+1]='0';
        }
    }
    cout<<p;
}

Compiler output:
a.cc:23:5: error: cannot declare '::main' to be a global variable
   23 | int main{
      |     ^~~~
a.cc:24:12: error: expected primary-expression before 's'
   24 |     string s;
      |            ^
a.cc:24:12: error: expected '}' before 's'
a.cc:23:9: note: to match this '{'
   23 | int main{
      |         ^
a.cc:25:5: error: 'cin' does not name a type
   25 |     cin >>s;
      |     ^~~
a.cc:27:5: error: expected unqualified-id before 'for'
   27 |     for(int i=0;i<s.size()-1;i++){
      |     ^~~
a.cc:27:17: error: 'i' does not name a type
   27 |     for(int i=0;i<s.size()-1;i++){
      |                 ^
a.cc:27:30: error: 'i' does not name a type
   27 |     for(int i=0;i<s.size()-1;i++){
      |                              ^
a.cc:34:5: error: 'cout' does not name a type
   34 |     cout<<p;
      |     ^~~~
a.cc:35:1: error: expected declaration before '}' token
   35 | }
      | ^
Language: C++

#include <bits/stdc++.h> 

int main{
    string s;
    cin >>s;
    int p=0;
    for(int i=0;i<s.size()-1;i++){
        if(s[i]==s[i+1]){
            p+=1;
            if(s[i+1]=='0') s[i+1]='1';
            else s[i+1]='0';
        }
    }
    cout<<p;
}

Compiler output:
a.cc:3:5: error: cannot declare '::main' to be a global variable
    3 | int main{
      |     ^~~~
a.cc:4:5: error: 'string' was not declared in this scope
    4 |     string s;
      |     ^~~~~~
a.cc:4:5: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:4:12: error: expected '}' before 's'
    4 |     string s;
      |            ^
a.cc:3:9: note: to match this '{'
    3 | int main{
      |         ^
a.cc:5:5: error: 'cin' does not name a type
    5 |     cin >>s;
      |     ^~~
a.cc:7:5: error: expected unqualified-id before 'for'
    7 |     for(int i=0;i<s.size()-1;i++){
      |     ^~~
a.cc:7:17: error: 'i' does not name a type
    7 |     for(int i=0;i<s.size()-1;i++){
      |                 ^
a.cc:7:30: error: 'i' does not name a type
    7 |     for(int i=0;i<s.size()-1;i++){
      |                              ^
a.cc:14:5: error: 'cout' does not name a type
   14 |     cout<<p;
      |     ^~~~
a.cc:15:1: error: expected declaration before '}' token
   15 | }
      | ^
Language: C++

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

int main()
{
    string s;
    cin>>s;
    int n=s.size();
    
    int c1=0,c2=0;
    for(int i=0;i<n;i++){
       if(s[i]=='0'and i%2) c1++;
       if(s[i]=='1' and !(i%2)) c1++;
    }
     
  for(int i=0;i<n;i++){
       if(s[i]=='1'and i%2) c2++;
       if(s[i]=='0' and !(i%2)) c2++;
    }
    cout<<min(c1,c2)<<endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:17: error: unable to find character literal operator 'operator""and' with 'char' argument
   12 |        if(s[i]=='0'and i%2) c1++;
      |                 ^~~~~~
a.cc:12:23: error: expected ')' before 'i'
   12 |        if(s[i]=='0'and i%2) c1++;
      |          ~            ^~
      |                       )
a.cc:17:17: error: unable to find character literal operator 'operator""and' with 'char' argument
   17 |        if(s[i]=='1'and i%2) c2++;
      |                 ^~~~~~
a.cc:17:23: error: expected ')' before 'i'
   17 |        if(s[i]=='1'and i%2) c2++;
      |          ~            ^~
      |                       )
Language: C

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void) {
  int i=0;
  srand((unsigned)time(0UL))
  int r=rand () % 10;
  int count=0;
  int s[r];
  for(;i<r;i++) {
    scanf("%d",&s[i]);
  }
  for(int j=0;j<r;j++) {
    if(s[j+1]==s[j]) {
      if(s[j+1]==1){
        s[j+1]=0;
        count++;
      }else if(s[j+1]==0){
        s[j+1]==1;
        count++;
      }
    }
  }
  printf("%d\n",count);
  return 0;
}
  


Compiler output:
main.c: In function 'main':
main.c:7:29: error: expected ';' before 'int'
    7 |   srand((unsigned)time(0UL))
      |                             ^
      |                             ;
    8 |   int r=rand () % 10;
      |   ~~~                        
main.c:10:9: error: 'r' undeclared (first use in this function)
   10 |   int s[r];
      |         ^
main.c:10:9: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void) {
  int i=0;
  srand((unsigned)time(0UL))
  int r=rand () 10;
  int count=0;
  int s[r];
  for(;i<r;i++) {
    scanf("%d",&s[i]);
  }
  for(int j=0;j<r;j++) {
    if(s[j+1]==s[j]) {
      if(s[j+1]==1){
        s[j+1]=0;
        count++;
      }else if(s[j+1]==0){
        s[j+1]==1;
        count++;
      }
    }
  }
  printf("%d\n",count);
  return 0;
}
  

Compiler output:
main.c: In function 'main':
main.c:7:29: error: expected ';' before 'int'
    7 |   srand((unsigned)time(0UL))
      |                             ^
      |                             ;
    8 |   int r=rand () 10;
      |   ~~~                        
main.c:10:9: error: 'r' undeclared (first use in this function)
   10 |   int s[r];
      |         ^
main.c:10:9: 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()
{
    char ch[100009];
    scanf("%s",&ch);
    int len=strlen(ch),cnt=0;
    if(len==1)
    {
        printf("0\n");
        return 0;
    }
    for(int i=0; i<len-1; i++)
    {
        if(ch[i]==ch[i+1])
        {
            if(ch[i]=='0')
            {
                temp=ch[i+1];
                ch[i+1]='1';
                ++cnt;
            }
            else if(ch[i]=='1')
            {
                temp=ch[i+1];
                ch[i+1]='0';
                ++cnt;
            }
        }
    }
    printf("%d\n",cnt);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:17: error: 'temp' was not declared in this scope; did you mean 'tm'?
   19 |                 temp=ch[i+1];
      |                 ^~~~
      |                 tm
a.cc:25:17: error: 'temp' was not declared in this scope; did you mean 'tm'?
   25 |                 temp=ch[i+1];
      |                 ^~~~
      |                 tm
Language: C++

#include<iostream>
#include<string>
#include<vector>

using namespace std;

int main() {
    vector<char> before1 = ["0", "1"];
    vector<char> before2 = ["1", "0"];
    int count1 = 0;
    int count2 = 0;
    string str;
    cin >> str;

    for (int i = 0; i < str.size(); i++){
        if (str[i] == before1[i%2]){
            count1++;
        }
        if (str[i] == before2[i%2]){
            count2++;
        }
    }

    if (count1 > count2){
        cout << count2 << endl;
    }ekse {
        cout << count1 << endl;
    }

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:29: error: expected identifier before string constant
    8 |     vector<char> before1 = ["0", "1"];
      |                             ^~~
a.cc:8:32: error: expected ']' before ',' token
    8 |     vector<char> before1 = ["0", "1"];
      |                                ^
      |                                ]
a.cc: In lambda function:
a.cc:8:32: error: expected '{' before ',' token
a.cc: In function 'int main()':
a.cc:8:28: error: conversion from 'main()::<lambda()>' to non-scalar type 'std::vector<char>' requested
    8 |     vector<char> before1 = ["0", "1"];
      |                            ^~~~
a.cc:8:34: error: expected unqualified-id before string constant
    8 |     vector<char> before1 = ["0", "1"];
      |                                  ^~~
a.cc:9:29: error: expected identifier before string constant
    9 |     vector<char> before2 = ["1", "0"];
      |                             ^~~
a.cc:9:32: error: expected ']' before ',' token
    9 |     vector<char> before2 = ["1", "0"];
      |                                ^
      |                                ]
a.cc: In lambda function:
a.cc:9:32: error: expected '{' before ',' token
a.cc: In function 'int main()':
a.cc:9:28: error: conversion from 'main()::<lambda()>' to non-scalar type 'std::vector<char>' requested
    9 |     vector<char> before2 = ["1", "0"];
      |                            ^~~~
a.cc:9:34: error: expected unqualified-id before string constant
    9 |     vector<char> before2 = ["1", "0"];
      |                                  ^~~
a.cc:26:6: error: 'ekse' was not declared in this scope
   26 |     }ekse {
      |      ^~~~
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main() {
    vector<char> before1 = ["0", "1"];
    vector<char> before2 = ["1", "0"];
    int count1 = 0;
    int count2 = 0;
    string str;
    cin >> str;

    for (int i = 0; i < str.size(); i++){
        if (str[i] == before1[i%2]){
            count1++;
        }
        if (str[i] == before2[i%2]){
            count2++;
        }
    }

    if (count1 > count2){
        cout << count2 << endl;
    }ekse {
        cout << count1 << endl;
    }

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'vector' was not declared in this scope
    7 |     vector<char> before1 = ["0", "1"];
      |     ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include<iostream>
  +++ |+#include <vector>
    2 | #include<string>
a.cc:7:12: error: expected primary-expression before 'char'
    7 |     vector<char> before1 = ["0", "1"];
      |            ^~~~
a.cc:8:12: error: expected primary-expression before 'char'
    8 |     vector<char> before2 = ["1", "0"];
      |            ^~~~
a.cc:15:23: error: 'before1' was not declared in this scope
   15 |         if (str[i] == before1[i%2]){
      |                       ^~~~~~~
a.cc:18:23: error: 'before2' was not declared in this scope
   18 |         if (str[i] == before2[i%2]){
      |                       ^~~~~~~
a.cc:25:6: error: 'ekse' was not declared in this scope
   25 |     }ekse {
      |      ^~~~
Language: C++

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

int main(){
  int n; cin>>n;
  string s; cin>>s;
  int count_a = 0;
  int count_b = 0;
  string odd;
  string even;
  
  for(int i=0;i<n;i++){
    if(i%2 == 0){
      even += s[i];
    }else{
      odd += s[i];
    }
  }
  //10101...と01010...で場合分けして少ないほうを出力
  for(int i=0;i<n/2+1;i++){
    if(even[i] == "0"){
      count_a++;
    }
    if(odd[i] == "1"){
      count_a++;
    }
  }
  for(int i=0;i<n/2;i++){
    if(even[i] == "1"){
      count_b++;
    }
    if(odd[i] == "0"){
      count_b++;
    }
  }
  cout<<min(count_a,count_b)<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:16: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   21 |     if(even[i] == "0"){
a.cc:24:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   24 |     if(odd[i] == "1"){
a.cc:29:16: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   29 |     if(even[i] == "1"){
a.cc:32:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   32 |     if(odd[i] == "0"){
Language: C++

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

int main(){
  int n; cin>>n;
  string s; cin>>s;
  int count_a = 0;
  int count_b = 0;
  string odd;
  string even;
  
  for(int i=0;i<n;i++){
    if(i%2 == 0){
      even += s[i];
    }else{
      odd += s[i];
    }
  }
  //10101...と01010...で場合分けして少ないほうを出力
  for(int i=0;i<n/2+1;i++){
    if(even[i] == "0"){
      count_a++;
    }
    if(odd[i] == "1"){
      count_a++;
    }
  }
  for(int i=0;i<n/2;i++){
    if(even[i] == "1"){
      count_b++;
    }
    if(odd[i] == "0"){
      count_b++;
    }
  }
  cout<<min(count_a,count_b)<<endl;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #<
    1 | #<bits/stdc++.h>
      |  ^
a.cc: In function 'int main()':
a.cc:5:10: error: 'cin' was not declared in this scope
    5 |   int n; cin>>n;
      |          ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | #<bits/stdc++.h>
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string s; cin>>s;
      |   ^~~~~~
a.cc:1:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
  +++ |+#include <string>
    1 | #<bits/stdc++.h>
a.cc:6:18: error: 's' was not declared in this scope
    6 |   string s; cin>>s;
      |                  ^
a.cc:9:9: error: expected ';' before 'odd'
    9 |   string odd;
      |         ^~~~
      |         ;
a.cc:10:9: error: expected ';' before 'even'
   10 |   string even;
      |         ^~~~~
      |         ;
a.cc:14:7: error: 'even' was not declared in this scope
   14 |       even += s[i];
      |       ^~~~
a.cc:16:7: error: 'odd' was not declared in this scope
   16 |       odd += s[i];
      |       ^~~
a.cc:21:8: error: 'even' was not declared in this scope
   21 |     if(even[i] == "0"){
      |        ^~~~
a.cc:24:8: error: 'odd' was not declared in this scope
   24 |     if(odd[i] == "1"){
      |        ^~~
a.cc:29:8: error: 'even' was not declared in this scope
   29 |     if(even[i] == "1"){
      |        ^~~~
a.cc:32:8: error: 'odd' was not declared in this scope
   32 |     if(odd[i] == "0"){
      |        ^~~
a.cc:36:3: error: 'cout' was not declared in this scope
   36 |   cout<<min(count_a,count_b)<<endl;
      |   ^~~~
a.cc:36:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:36:9: error: 'min' was not declared in this scope; did you mean 'main'?
   36 |   cout<<min(count_a,count_b)<<endl;
      |         ^~~
      |         main
a.cc:36:31: error: 'endl' was not declared in this scope
   36 |   cout<<min(count_a,count_b)<<endl;
      |                               ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | #<bits/stdc++.h>
Language: C++

#include <iostream>
#include <vector>
#include <cstdio>
#include <string>
#include <stack>
#include <algorithm>
#include <iomanip>
#include <math.h>
#include <numeric>
using namespace std;
#define MOD 1000000007
typedef long long ll;
typedef pair <int,int> P;

int main(){
  string s;
  cin >> s;
 
  int n = s.size();
 
  int ans1 = 0, ans2 = 0;
  REP(i,n){
    if(i%2 == s[i]-'0') ans1++;
    else ans2++;
  }
 
  cout << min(ans1,ans2) << endl; 

}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:7: error: 'i' was not declared in this scope
   22 |   REP(i,n){
      |       ^
a.cc:22:3: error: 'REP' was not declared in this scope
   22 |   REP(i,n){
      |   ^~~
Language: C

#include <stdio.h>
int main(){
  int n=0,i;
  char S[100000];
  
  scanf("%s",&S);
  
  for(i=0;S[i+1]!='\0';i++){
    if((S[i]==S[i+1] && (S[i]=='0')){
      n++;
      S[i+1]='1';
    }
    if((S[i]==S[i+1]) && (S[i]=='1')){
      n++;
      S[i+1]='0';
    }
  }
  printf("%d\n",n);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:9:37: error: expected ')' before '{' token
    9 |     if((S[i]==S[i+1] && (S[i]=='0')){
      |       ~                             ^
      |                                     )
main.c:17:3: error: expected expression before '}' token
   17 |   }
      |   ^
Language: C

#include <stdio.h>
#include <string.h>
int main(void){
    char *s[];
    scanf("%s",s);
    
    //最初が０からのパターンと最初が１からのパターンそれぞれ確認する。
  	int length = strlen(s);
  	int sum0=0;
  	int sum1=0;
  	
  	for(int i = 0; i < length;i++){
      	if(s[i] == '0' && i % 2 == 0){
          sum0++;
        }else if(s[i] == '1' && i % 2 == 1){
          sum0++;
        }      	
 
      	if(s[i] == '1' && i % 2 == 0){
          sum1++;
        }else if(s[i] == '0' && i % 2 == 1){
          sum1++;
        }      	
    }
  
  if(sum0 > sum1){
    printf("%d",sum1);
  }else{
    printf("%d",sum0);
  }
  	
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:11: error: array size missing in 's'
    4 |     char *s[];
      |           ^
main.c:8:29: error: passing argument 1 of 'strlen' from incompatible pointer type [-Wincompatible-pointer-types]
    8 |         int length = strlen(s);
      |                             ^
      |                             |
      |                             char **
In file included from main.c:2:
/usr/include/string.h:407:35: note: expected 'const char *' but argument is of type 'char **'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
main.c:13:17: warning: comparison between pointer and integer
   13 |         if(s[i] == '0' && i % 2 == 0){
      |                 ^~
main.c:15:23: warning: comparison between pointer and integer
   15 |         }else if(s[i] == '1' && i % 2 == 1){
      |                       ^~
main.c:19:17: warning: comparison between pointer and integer
   19 |         if(s[i] == '1' && i % 2 == 0){
      |                 ^~
main.c:21:23: warning: comparison between pointer and integer
   21 |         }else if(s[i] == '0' && i % 2 == 1){
      |                       ^~
Language: C

#include <stdio.h>
#include <string.h>
int main(void){
    char s[];
    scanf("%s",&s);
    
    //最初が０からのパターンと最初が１からのパターンそれぞれ確認する。
  	int length = strlen(s);
  	int sum0=0;
  	int sum1=0;
  	
  	for(int i = 0; i < length;i++){
      	if(s[i] == '0' && i % 2 == 0){
          sum0++;
        }else if(s[i] == '1' && i % 2 == 1){
          sum0++;
        }      	

      	if(s[i] == '1' && i % 2 == 0){
          sum1++;
        }else if(s[i] == '0' && i % 2 == 1){
          sum1++;
        }      	
    }
  
  if(sum0 > sum1){
    printf("%d",sum1);
  }else{
    printf("%d",sum0);
  }
  	
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:10: error: array size missing in 's'
    4 |     char s[];
      |          ^
Language: C++

#include<iostream>
#include<cstring>
using namespace std;
char s[100010];
int main(){
  cin>>s;
  int ans1=0,ans2=0;
  char a='0';
  for(int i=0;i<strlen(s);i++){
    if(s[i]!=a) ans1++;
    a='0'+'1'-a;
  }
  a='1';
  for(int i=0;i<strlen(s);i++){
    if(s[i]!=a) ans2++;
    a='0'+'1'-a;
  }
  cout<<ans1<<ans2?ans1:ans2<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:29: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
   18 |   cout<<ans1<<ans2?ans1:ans2<<endl;
      |                         ~~~~^~~~~~
Language: C

#include<stio.h>
int main(void){
  int n=0;
  char S[100000];
  char *p1=&S[0];
  char *p2=&S[1];
  
  scanf("%d",&S);
  
  while(*p2!='\0'){
    if((*p1==*p2) && (*p2=='0')){
      n++;
      *p2='1';
    }
    if((*p1==*p2) && (*p2=='1')){
      n++;
      *p2='0';
    }
    p1++; p2++;
  }
  printf("%d\n",n);
  return 0;
}

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


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

public class C124 {

	public static void main(String[] args) {
		Scanner s  = new Scanner(System.in);
		
		char[] arr = s.next().toCharArray();
		int l = arr.length;
		char[] A = new char[l];
		char[] B = new char[l];
		int c=0,d = 0;
		for(int i = 0;i<l;i++)
		{
			A[i] = i%2==0?'0':'1';
			B[i] = i%2==0?'1':'0';
			if(A[i]!=arr[i])c++;
			if(B[i]!=arr[i])d++;
		}System.out.println(Math.min(c,d));
		
	}
	
}


Compiler output:
Main.java:5: error: class C124 is public, should be declared in a file named C124.java
public class C124 {
       ^
1 error
Language: Java

import java.util.Scanner;

public class main {
    
    public static void main(String[] args) {
        // TODO 自動生成されたメソッド・スタブ
        
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        
        String[] array = input.split("");
        
        int count = 0;
        
        if ("0".equals(array[0])) {
            
            for (int i = 1; i < array.length; i++) {
                
                if (array[i].equals("0") && "0".equals(array[i - 1])) {
                    
                    array[i] = "1";
                    count++;
                }
                
                if ("1".equals(array[i]) && "1".equals(array[i - 1])) {
                    
                    array[i] = "0";
                    count++;
                }
            }
        }
        
        if (array[0].equals("1")) {
            
            for (int i = 1; i < array.length; i++) {
                
                if ("1".equals(array[i]) && "1".equals(array[i - 1])) {
                    
                    array[i] = "0";
                    count++;
                }
                
                if ("0".equals(array[i]) && "0".equals(array[i - 1])) {
                    
                    array[i] = "1";
                    count++;
                }
            }
        }
        
        System.out.println(count);
        
        sc.close();
    }
    
}


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

#include <iostream>
using namespace std;
int main(void){
    int c=0,b=0;
    string a;
    cin>>a;
    for(int i=0;i<a.size();i++){
        if(i%2==0){
            if(a[i]!='0'){
                b++;
            }
            else if(a[i]!='1'){
                c++;
            }}
            
            if(i%2==1){
            if(a[i]!='0'){
                c++;
            }
            else if(a[i]!='1'){
                b++;
            }    
        }
    }
    if(b>c){
        cout<<c<<endl;
    }
    else {
        cout<<b<<endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:29:23: error: expected '}' at end of input
   29 |         cout<<b<<endl;
      |                       ^
a.cc:28:10: note: to match this '{'
   28 |     else {
      |          ^
a.cc:29:23: error: expected '}' at end of input
   29 |         cout<<b<<endl;
      |                       ^
a.cc:3:15: note: to match this '{'
    3 | int main(void){
      |               ^
Language: C++

#include <iostream>
#include <string>
int main() {
  std::string S;
  std::cin >> S;
  int true_cnt=0;
  bool even = true;
  for(int i=0;i<S.size();i++) {
    bool zero = S[i]=='0';
    if ((even && zero) || (!even && !zero))
      true_cnt++
    even = !even;
  }
  int ans = true_cnt > S.size()/2 ? S.size() - true_cnt: true_cnt;
  std::cout << ans << std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:17: error: expected ';' before 'even'
   11 |       true_cnt++
      |                 ^
      |                 ;
   12 |     even = !even;
      |     ~~~~
Language: C++

#include <iostream>
#include <string>
int main() {
  std::string S;
  std::cin >> S;
  int true_cnt=0;
  bool evan = true;
  for(int i=0;i<S.size();i++) {
    bool zero = S[i]=='0';
    if ((even && zero) || (!even && !zero))
      true_cnt++
    even = !even;
  }
  int ans = true_cnt > S.size()/2 ? S.size() - true_cnt: true_cnt;
  std::cout << ans << std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:10: error: 'even' was not declared in this scope; did you mean 'evan'?
   10 |     if ((even && zero) || (!even && !zero))
      |          ^~~~
      |          evan
a.cc:11:17: error: expected ';' before 'even'
   11 |       true_cnt++
      |                 ^
      |                 ;
   12 |     even = !even;
      |     ~~~~
Language: C++

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

int min(int a, int b){
        if(a < b){
            return a;
        }
        return b;
    }


int main(){
    int N;
    cin >> N;
    string s;
    cin >> s;
    

    int ans1 = 0, ans2 = 0;
    //偶数番目で１であることと奇数番目で０であることは同じであることから
    //変数は2つでよい
    for(int i = 0; i < s.length; i++){
        //偶数番目
        if(i % 2){
            if(s[i] == '0'){
                ans1++;
            }else if(s[i] == '1'){
                ans2++;
            }
        //奇数番目
        }else{
            if(s[i] == '0'){
                ans2++;
            }else if(s[i] == '1'){
                ans1++;
            }
        }

        
    }


    //何枚のタイルを塗り替えるかを聞かれてるので
    //小さいほうが塗り替えられる。
    cout << min(ans1,ans2) << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:26: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
   22 |     for(int i = 0; i < s.length; i++){
      |                        ~~^~~~~~
      |                                ()
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
int main(){
  char s[100005];
  int b1=0,b2=0,w1=0,w2=0;
  cin>>s;
  for(int i=0;i<strlen(s);i+=2){
    if(s[i]=='1'){
      w1++;
    }else{
      b2++;
    }
  }
  for(int i=1;i<strlen(s);i+=2){
    if(s[i]=='0'){
      b1++;
    }else{
      w2++;
    }
  }
  cout<<min(b1+w1,b2+w2)<<"\n";
    
      

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: 'strlen' was not declared in this scope
    8 |   for(int i=0;i<strlen(s);i+=2){
      |                 ^~~~~~
a.cc:3:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<algorithm>
  +++ |+#include <cstring>
    3 | using namespace std;
a.cc:15:17: error: 'strlen' was not declared in this scope
   15 |   for(int i=1;i<strlen(s);i+=2){
      |                 ^~~~~~
a.cc:15:17: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
Language: C++

#include<stdio.h>
int main(void)
{
  char s[100000]={0};
  int kai=0; 
  int i=0;
  scanf("%s",s);
  for(i=;i<=100000;i++){
    if(s[i]=='i'&&i%2!=0){
      kai++;
    }
    if(s[i]=='0'&&i%2==0){
      kai++;
    }
    
    if(s[i]=='\0'){
      break;
    }
    
  }
  if(kai*2<i){
    printf("%d",kai);
  }
  else{
    printf("%d",i-kai);
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: expected primary-expression before ';' token
    8 |   for(i=;i<=100000;i++){
      |         ^
Language: C++

#include<stdio.h>
#include<string.h>
int main(void){
  char s[500];
  int count =0;
 int N;
scanf("%s",&s);
 N=strlen(s);
 for(i=0;i<=N-1;i++){
 if(s[i]==s[i+1]){
   if(s[i+1]=='0'){
     s[i+1]='1';
   }else{
     s[i+1]='0';
   }
   count++;
 }
 }
  printf("%d",count);
  return 0;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:9:6: error: 'i' was not declared in this scope
    9 |  for(i=0;i<=N-1;i++){
      |      ^
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
  int i=0;
 else{
  do{
    if(s[i]==s[i+1]){
      if(s[i]='0')
        s[i+1]='1';
      if(s[i]='1')
        s[i+1]='0';
      	++count;
    }
      	
    	i++;
  	  }while(s[i]=='\0');
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:7:2: error: 'else' without a previous 'if'
    7 |  else{
      |  ^~~~
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
  int i=0;
 else{
  do{
    if(s[i]==s[i+1]){
      if(s[i]='0')
        s[i+1]='1';
      if(s[i]='1')
        s[i+1]='0';
      }
      	count++;
    }
    i++;
  	  }while(s[i]=='\0');
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:7:2: error: 'else' without a previous 'if'
    7 |  else{
      |  ^~~~
main.c:17:5: error: expected 'while' before 'i'
   17 |     i++;
      |     ^
main.c: At top level:
main.c:21:11: error: expected declaration specifiers or '...' before string constant
   21 |    printf("%d",count);
      |           ^~~~
main.c:21:16: error: unknown type name 'count'
   21 |    printf("%d",count);
      |                ^~~~~
main.c:23:4: error: expected identifier or '(' before 'return'
   23 |    return 0;
      |    ^~~~~~
main.c:24:2: error: expected identifier or '(' before '}' token
   24 |  }
      |  ^
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
  int i=0;
 else{
  do{
    if(s[i]==s[i+1]){
      switch(s[i]){
        case 0: s[i+1]='1';
      	case 1: s[i+1]='0';
      }
      	count++;
    }
    i++;
  	  }while(s[i]=='0'||s[i]=='1');
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:7:2: error: 'else' without a previous 'if'
    7 |  else{
      |  ^~~~
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
 else{
  do{
    if(s[i]==s[i+1]){
      switch(s[i]){
        case 0: s[i+1]='1';
      	case 1: s[i+1]='0';
      }
      	count++;
    }
  	  }while(s[i]=='0'||s[i]=='1');
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:6:2: error: 'else' without a previous 'if'
    6 |  else{
      |  ^~~~
main.c:8:10: error: 'i' undeclared (first use in this function)
    8 |     if(s[i]==s[i+1]){
      |          ^
main.c:8:10: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
 else{
  do{
    if(s[i]==s[i+1]){
      switch(s[i]){
        case 0: s[i+1]==1;
      	case 1: s[i+1]==0;
      }
      	count++;
    }
  	  }while(s[i]==0||s[i]==1);
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:6:2: error: 'else' without a previous 'if'
    6 |  else{
      |  ^~~~
main.c:8:10: error: 'i' undeclared (first use in this function)
    8 |     if(s[i]==s[i+1]){
      |          ^
main.c:8:10: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
  if(s[1]=='\0')
    count=0;
 else{
  do{
    if(s[i]==s[i+1]){
      switch(s[i]){
        case 0: s[i+1]==1;
      	case 1: s[i+1]==0;
      }
      	count++;
    }
  	  }while(s[i]==0||s[i]==1);
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:10:10: error: 'i' undeclared (first use in this function)
   10 |     if(s[i]==s[i+1]){
      |          ^
main.c:10:10: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
  if(char s[1]=='\0')
    count=0;
 else{
  do{
    if(s[i]==s[i+1]){
      switch(s[i]){
        case 0: s[i+1]==1;
      	case 1: s[i+1]==0;
      }
      	count++;
    }
  	  }while(s[i]==0||s[i]==1);
 }
     
   printf("%d",count);
   
   return 0;
 }

Compiler output:
main.c: In function 'main':
main.c:6:6: error: expected expression before 'char'
    6 |   if(char s[1]=='\0')
      |      ^~~~
main.c:10:10: error: 'i' undeclared (first use in this function)
   10 |     if(s[i]==s[i+1]){
      |          ^
main.c:10:10: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main(){
  char s[100000];
  scanf("%s",s);
  int count=0;
  if(char s[1]=='\0')
    count=0;
 else{
   for(i=0;i<=99999;i++){
    if(s[i]==s[i+1]){
      switch(s[i]){
        case 0: s[i+1]==1;
      	case 1: s[i+1]==0;
      }
      	count++;
    }
  	  }
     
   printf("%d",count);
   
   return 0;
 }
       
    

Compiler output:
main.c: In function 'main':
main.c:6:6: error: expected expression before 'char'
    6 |   if(char s[1]=='\0')
      |      ^~~~
main.c:9:8: error: 'i' undeclared (first use in this function)
    9 |    for(i=0;i<=99999;i++){
      |        ^
main.c:9:8: note: each undeclared identifier is reported only once for each function it appears in
main.c:22:2: error: expected declaration or statement at end of input
   22 |  }
      |  ^
Language: C++

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

const int maxn = 100010;
char str[maxn];

int main() {
#ifdef HOME
  freopen("input.txt", "r", stdin);
#endif
  int n;
  n = strlen(gets(str));
  int cnt = 0;
  char ch = '0';
  for (int i = 0; i < n; ++i) {
    if (ch != str[i]) ++cnt;
    ch = ch == '0' ? '1' : '0';
//    cout << i << ' ' << ch << ' ' << cnt << endl;
  }
  int ans = 0;
  ch = '1';
  for (int i = 0; i < n; ++i) {
    if (ch != str[i]) ++ans;
    ch = ch == '0' ? '1' : '0';
//    cout << i << ' ' << ch << ' ' << ans << endl;
  }
  
  cout << min(ans, cnt);
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: 'gets' was not declared in this scope; did you mean 'getw'?
   12 |   n = strlen(gets(str));
      |              ^~~~
      |              getw
Language: C++

#include <bits/stdc++.h>
using namespace std;
int mian()
{
  int a=0;
  string s;
  cin>>s;
  for(int i=0;i<s.size();i++)
  {
    if(i%2==0&&s[i]=='1')
    {
      a++;
    }
  }
  if(a<s.size()/2)
  {
    cout<<a<<endl;
  }
  else
  {
    cout<<s.size()-a;
  }
  return 0;
}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

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

int main(){
  string s;
  cin >> s;
  int n = s.size();
  
  int ans = INT_MAX;
  for(int k=0; k<2; k++){
    int count = 0;
    for(int i=0; i<n; i++){
      if(s[i] != '0' + (i+k)%2){
        count++;
      }
    }
    ans = min(ans,cnt);
  }
  cout << ans << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:19: error: 'cnt' was not declared in this scope; did you mean 'int'?
   17 |     ans = min(ans,cnt);
      |                   ^~~
      |                   int
Language: C++

s = input()
n = len(s)
count = 0
count2 = 0
for i in range(n):
	if i % 2 == 0:
		x = "0"
	else:
		x = "1"
	if s[i] == x:
		count2 += 1 
		#print(i, s[i],x, "OK")
	else:
		count += 1
		#print(i, s[i], x)
print(min(count,count2))

Compiler output:
a.cc:12:18: error: invalid preprocessing directive #print
   12 |                 #print(i, s[i],x, "OK")
      |                  ^~~~~
a.cc:15:18: error: invalid preprocessing directive #print
   15 |                 #print(i, s[i], x)
      |                  ^~~~~
a.cc:1:1: error: 's' does not name a type
    1 | s = input()
      | ^
Language: C++

s =input()
n =len(s)
count=0
count2=0
for i in range(n):
	if i %2==0:
		x="0"
	else:
		x="1"
	if s[i]==x:
		count2+=1
		#print(i,s[i],x,"OK")
	else:
		count +=1
		#print(i,s[i],x)
print(count,"回または",count2,"回でいけます")
	

Compiler output:
a.cc:12:18: error: invalid preprocessing directive #print
   12 |                 #print(i,s[i],x,"OK")
      |                  ^~~~~
a.cc:15:18: error: invalid preprocessing directive #print
   15 |                 #print(i,s[i],x)
      |                  ^~~~~
a.cc:1:1: error: 's' does not name a type
    1 | s =input()
      | ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

char s[10005], a[10005], b[10005];

int b1, b2, ans;
int main()
{
    cin.getline(s, 10005);
        for (int i=0; i<lung; i++)
        {
            if (i%2==0)
            {
                a[i]='0';
                b[i]='1';
            }
            else
            {
                a[i]='1';
                b[i]='0';
            }
        }

        for (int i=0; i<lung; i++)
        {
            if (s[i]!=a[i]) b1++;
            if (s[i]!=b[i]) b2++;
        }
        ans = min(b1, b2);
    cout<<ans;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:25: error: 'lung' was not declared in this scope; did you mean 'long'?
   11 |         for (int i=0; i<lung; i++)
      |                         ^~~~
      |                         long
a.cc:25:25: error: 'lung' was not declared in this scope; did you mean 'long'?
   25 |         for (int i=0; i<lung; i++)
      |                         ^~~~
      |                         long
Language: C++

#include <bists/stdc++.h>
using namespace std;
int main()
{
  string s;
  cin >> s;
  int oc = 0, ec= 0;
  for(int i = 0 ; i < s.size(); ++i)
  {
    if(s[i] == '0' && i %2 == 0)
    {
      ec++;
    }
    else
      oc++;
  }
  int cnt = 0;
  if(oc > ec)
  {
  	for(int i = 0; i < s.size(); ++i)
    {
		if(i %2 != '0' )
        {
          if(s[i] != '0')
            cnt++;
        }
      	else
        {
          if(s[i] != '1')
            cnt++;
        }
    }
  }
  else
  {
  	for(int i = 0; i < s.size(); ++i)
    {
		if(i %2 != '1' )
        {
          if(s[i] != '1')
            cnt++;
        }
      	else
        {
          if(s[i] != '0')
            cnt++;
        }
    }
    cout << cnt;
  }
  
}

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

#include <bits/stdc++.h>
using namespace std;
int main()
{
	string n;
	cin>>n;
	int a=0,b=0;
	for(int i=0;i<=n.size;i++)
	{
		if(i%2==0)
		{
			if(n[i]=='0')
			
				  ++b;
				else
				  ++a;
		}
		else
		{
			if(n[i]=='1')
			  ++b;
			else
		   	  ++a;
		}
		
	}
	if(a<b)
	{
	    cout<<a;	
	}
	else
	{
		cout<<b;
	}
	cout<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:26: 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 '()' ?)
    8 |         for(int i=0;i<=n.size;i++)
      |                        ~~^~~~
      |                              ()
Language: Java

import java.util.*;
class Main{
    public static void main(String[] args) {
        //入力
        Scanner scn=new Scanner(System.in);
        String tile=scn.next();
        //処理
        int[] cnt=new int[2];
        for(int i=0;i<2;i++){
            cnt[i]=0;
            for(int j=0;j<tile.length();j++){
                if(j%2==0&&Character.getNumericValue(tile.charAt(j))==i) cnt[i]++;
                
                if(j%2==1&Character.getNumericValue(tile.charAt(j))!=i) cnt[i]++;
                
            }
        }
      　//出力
        System.out.println(Math.min(cnt[0],cnt[1]));
    }
}


Compiler output:
Main.java:18: error: illegal character: '\u3000'
      ?//??
      ^
1 error
Language: C

#include <stdio.h>
int kai(int k){
  int a=1;
  while(0<k){
    a=a*10;
    k--;
  }
  return a;
}
 
int main(){
  int sum,n,s,ct1=0,ct2=0;
  scanf("%d",&n);
  for(int i=0;i<=kai(5);i=i+2){
    if(n%kai(i)==0){
ct1++;
      if(n%kai(i)==n){
        s=i;
      }
    }
  }
    for(int i=1;i<=kai(5);i=i+2){
 if(n%kai(i)==0){
ct2++;
    }
       if(n%kai(i)==n){
        s=i;
      }
  }
  if(i%2==0){
    if(ct1<ct2){
      sum=i/2+ct1-ct2;
    }else{
      sum=i/2+ct2-ct1;
    }
  }else{
    if(ct1<ct2){
      sum=i/2+ct1-ct2;
    }else{
      sum=i/2+ct2-ct1+1;
    }
  }
  printf("%d",sum);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:30:6: error: 'i' undeclared (first use in this function)
   30 |   if(i%2==0){
      |      ^
main.c:30:6: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

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

int main() {
  string S;
  string A,B;
  
  cin >> S;
  int c1,c2;
  
  for(int i=0;i<S.size();i++){
    if(i%2==0){
      A.at(i)='0';
      B.at(i)='1';
    }else{
      A.at(i)='1';
      B.at(i)='0';
    }
    if(S.at(i)!=A.at(i)) c1++;
    if(S.at(i)!=B.at(i)) c2++;
  }
  
  cout << min(c1,c2) << endl;
}

  
  

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