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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    string s;
    cin >> s;
 
    int k;
    cin >> k;
 
    long long size = s.size();
 
    s = s + ' ';
    vector<int> cnt(size, 0);
 
    bool start=false;
    bool end=false;
 
    int tmp = -1;
 
    long long sum = 0;
 
    bool flag=true;
    int cnt_start=1;
    int cnt_end=0;
 
     if(size() == 1){
        sum = k / 2;
        cout << sum << endl;
        return 0;
    }
 
    for(int i=0; i < size-1; i++){
        if(s.at(i) != s.at(i+1)){
            break;
        }
        if(i == size-2){
            sum = ((size) * k) / 2;
            cout << sum << endl;
            return 0;
        }
    }
 
    for(int i=1; i < size; i++){
        if(s.at(0) == s.at(i)){
            cnt_start++;
        }
        else{
            break;
        }
    }
 
    for(int i=size-1; i > 0; i--){
        if(s.at(0) == s.at(i)){
            cnt_end++;
        }
        else{
            break;
        }
    }
 
    for(int j=0; j < size-1; j++){
        if(s.at(j) != s.at(j+1)){
            start = false;
        }
        else if(s.at(j) == s.at(j+1) && tmp <= j){
            start = true;
        }
 
 
        for(int i=j; i < s.size(); i++){
            if(s.at(j) == s.at(i) && start == true){
                cnt.at(j)++;
                end = true;
  //            cout << cnt.at(j) << endl;
            }
            else if(s.at(j) != s.at(i)  && end == true){
                start = false;
                end = false;
                tmp = i;
                cnt.at(j) = cnt.at(j) / 2;
            }
        }
    }
 
    for(int c: cnt){
//        cout << c << endl;
        sum += c;
    }

    sum = k * sum;
    if((cnt_start + cnt_end) % 2 == 0 && cnt_start % 2 != 0 && cnt_end % 2 != 0){
        sum += (k-1);

    }

    cout << sum << endl;
 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:13: error: 'size' cannot be used as a function
   27 |      if(size() == 1){
      |         ~~~~^~
Language: C++

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

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  string s;
  int k;
  cin >> s >> k;
  int n = s.size();
  if(s == substr(n, s[0])) {
    cout << (long long)n * k / 2 << '\n';
    return 0;
  }
  if (k == 1) {
    string ss = s;
    long long res = 0;
    for (int i = 1; i < n; i++) {
      if (ss[i] == ss[i - 1]) {
        ss[i] = 'X';
        res++;
      }
    }
    long long ans = res;
    res = 0;
    ss = s;
    for (int i = 0; i + 1 < n; i++) {
      if (ss[i] == ss[i + 1]) {
        ss[i] = 'X';
        res++;
      }
    }
    ans = min(ans, res);
    cout << ans << '\n';
  } else if(k == 2) {
    string ss = s + s;
    long long res = 0;
    for (int i = 1; i < n + n; i++) {
      if (ss[i] == ss[i - 1]) {
        ss[i] = 'X';
        res++;
      }
    }
    long long ans = res;
    res = 0;
    ss = s + s;
    for (int i = 0; i + 1 < n + n; i++) {
      if (ss[i] == ss[i + 1]) {
        ss[i] = 'X';
        res++;
      }
    }
    ans = min(ans, res);
    cout << ans << '\n';
  } else {
    string ss0 = s + s + s;
    string ss1 = s + s + s;
    for (int i = 1; i < n + n + n; i++) {
      if (ss0[i] == ss0[i - 1]) {
        ss0[i] = 'X';
      }
    }
    for (int i = 0; i + 1 < n + n + n; i++) {
      if (ss1[i] == ss1[i + 1]) {
        ss1[i] = 'X';
      }
    }
    long long cnt0 = 0, cnt1 = 0;
    for (int i = n; i < n + n; i++) {
      cnt0 += (ss0[i] == 'X');
      cnt1 += (ss1[i] == 'X');
    }
    long long res0 = 0, res1 = 0;
    string ss = s + s + s;
    for (int i = n; i < n + n; i++) {
      ss[i] = ss0[i];
    }
    for (int i = n - 1; i >= 0; i--) {
      if(ss[i] == ss[i + 1]) {
        ss[i] = 'X';
        res0++;
      }
    }
    for (int i = n + n; i < n + n + n; i++) {
      if(ss[i] == ss[i - 1]) {
        ss[i] = 'X';
        res0++;
      }
    }
    ss = s + s + s;
    for (int i = n; i < n + n; i++) {
      ss[i] = ss1[i];
    }
    for (int i = n - 1; i >= 0; i--) {
      if(ss[i] == ss[i + 1]) {
        ss[i] = 'X';
        res1++;
      }
    }
    for (int i = n + n; i < n + n + n; i++) {
      if(ss[i] == ss[i - 1]) {
        ss[i] = 'X';
        res1++;
      }
    }
    long long ans = min(cnt0 * (k - 2) + res0, cnt1 * (k - 2) + res1);
    cout << ans << '\n';
  }

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: 'substr' was not declared in this scope; did you mean 'strstr'?
   11 |   if(s == substr(n, s[0])) {
      |           ^~~~~~
      |           strstr
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    string s;
    cin >> s;
 
    int k;
    cin >> k;
 
    int size = s.size();
 
    s = s + ' ';
    vector<int> cnt(size, 0);
 
    bool start=false;
    bool end=false;
 
    int tmp = -1;
 
    long long sum = 0;
 
    bool flag=true;
    int cnt_start=1;
    int cnt_end=0;
 
    if(s.size() == 1){
        sum = k / 2;
        cout << sum << endl;
        return 0;
    }
 
    for(int i=0; i < s.size()-1; i++){
        if(s.at(i) != s.at(i+1)){
            break;
        }
 
        if(i == s.size()-2){
            sum = s.size() / 2 * k;
            cout << sum << endl;
            return 0;
        }
    }


    for(int i=1; i < size; i++){
        if(s.at(0) == s.at(i)){
            cnt_start++;
        }
        else{
            break;
        }
    }
 
    for(int i=size-1; i > 0; i--){
        if(s.at(0) == s.at(i)){
            cnt_end++;
        }
        else{
            break;
        }
    }
 
    for(int j=0; j < size-1; j++){
        if(s.at(j) != s.at(j+1)){
            start = false;
        }
        else if(s.at(j) == s.at(j+1) && tmp <= j){
            start = true;
        }
 
 
        for(int i=j; i < s.size(); i++){
            if(s.at(j) == s.at(i) && start == true){
                cnt.at(j)++;
                end = true;
  //            cout << cnt.at(j) << endl;
            }
            else if(s.at(j) != s.at(i)  && end == true){
                start = false;
                end = false;
                tmp = i;
                cnt.at(j) = cnt.at(j) / 2;
            }
        }
    }
 
    for(int c: cnt){
//        cout << c << endl;
        sum += c;
    }
 
    if(size == 1 || flag_same == true){
        sum = size / 2 * k;
    }
    else{
        sum = k * sum;
        if((cnt_start + cnt_end) % 2 == 0 && cnt_start % 2 != 0 && cnt_end % 2 != 0){
           sum += (k-1);
//        cout << count << endl;
        }
    }
 
 
    cout << sum << endl;
 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:93:21: error: 'flag_same' was not declared in this scope
   93 |     if(size == 1 || flag_same == true){
      |                     ^~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s[3];
  long long k,a[3]={};
  long long ans=0;
  cin >> s[0];
  cin >> k;

  for(size_t i=0;i<2;++i) s[i+1]=s[i]+s[0];
  for(size_t i=0;i<3;++i) for(size_t j=0;j<s[i].length()-1;++j) if(s[i][j]==s[i][j+1]) ++a[i],++j;
  if(K==1) cout << a[0] << endl;
  if(K==2) cout << a[1] << endl;
  if(K>2)cout<<a[2]+(k-2)*(a[1]-a[0])<<endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:6: error: 'K' was not declared in this scope
   12 |   if(K==1) cout << a[0] << endl;
      |      ^
a.cc:13:6: error: 'K' was not declared in this scope
   13 |   if(K==2) cout << a[1] << endl;
      |      ^
a.cc:14:6: error: 'K' was not declared in this scope
   14 |   if(K>2)cout<<a[2]+(k-2)*(a[1]-a[0])<<endl;
      |      ^
Language: C++

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

typedef long long ll;

int main(){
  string s;
  cin >> s;
  int k;
  cin >> k;
  
  int n = s.length();
  bool prev = false;
  int cnt = 0;
  for(int i = 1;i < n; i++){
    if(s[i]==s[i-1] && !prev){
      cnt++;
      prev = true;
    }
  }
  ll ret = 0;
  if(prev||s[i]!=s[i-1]){
    ret = (ll)cnt * k;
  }else{
    char c = s[0];
    int i = 0;
    while(s[i] == s[0]){
      i++;
    }
    if(i%2==0)ret = (ll)cnt*k;
    else ret = (ll)(cnt+1)*(k-1)+cnt;
  }
  cout << ret << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:14: error: 'i' was not declared in this scope
   22 |   if(prev||s[i]!=s[i-1]){
      |              ^
a.cc:26:9: error: redeclaration of 'int i'
   26 |     int i = 0;
      |         ^
a.cc:22:14: note: '<typeprefixerror>i' previously declared here
   22 |   if(prev||s[i]!=s[i-1]){
      |              ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define For(i,n,k) for(ll i=(n);i<(k);i++)
ll n,m,ans=-100;
int s[200][200];
const ll MOD = 1000000007;
bool bfs(int t,vector<ll> &group){
    queue<int> q;
    group.at(t)=1;
    q.push(t);
    while(!q.empty()){
        int i=q.front();
        int nowdist=group.at(i);
        q.pop();
        For(j,0,n){
            if(s.at(i).at(j)==1){
                if(group.at(j)==nowdist){
                    return false;
                }
                if(group.at(j)==0){
                    q.push(j);
                    if(group.at(j)==nowdist){
                        return false;
                    }
                    group.at(j)=group.at(i)+1;
                }
            }
        }
    }
    return true;
}

ll count(ll t){
    vector<ll> group(n,0);
    bool flag=bfs(t,group);
    if(!flag) return -1;
    ll kazu=-1;
    For(i,0,n){
        kazu=max(kazu,group.at(i));
    }
    return kazu;
}
void Main(){    
    cin>>n;
    For(i,0,n){
        string x;cin>>x;
        For(j,0,n){
            s[i][j]=x.at(j)-'0';
        }
    }
    For(t,0,n){
        ll cnt=count(t);
        ans=max(ans,cnt);
    }
    cout<<ans<<endl;
}
int main(){
    Main();
    return 0;
}


Compiler output:
a.cc: In function 'bool bfs(int, std::vector<long long int>&)':
a.cc:17:18: error: request for member 'at' in 's', which is of non-class type 'int [200][200]'
   17 |             if(s.at(i).at(j)==1){
      |                  ^~
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(){
    string s;
    ll k;
    cin>>s>>k;
    int ans = 1;
    int tmp = 0;
    if (s == string(n, s[0])) {
        cout << n * k / 2 << endl;
        return 0;
    }
    for(int i=1;i<=s.size();i++){
        if(s[i]==s[i-1]){
            ans++;
        }else{
            tmp += ans/2;
            ans=1;
        }
    }
    if(s[0]==s[s.size()-1] && s[s.size()-2]!=s[s.size()-1]){
        cout <<  tmp * k + k-1<< endl;
    }else{
        cout << tmp * k << endl;
    }
    
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:12:21: error: 'n' was not declared in this scope
   12 |     if (s == string(n, s[0])) {
      |                     ^
Language: C++

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

int main()
{
	string S;
	long K;
	char T;
	long cnt = 0;

	cin >> S >> K;

	int len = (int)(S.length());
	if(len == 1){
      	cout << 0;
		return 0;
    }
  	if (S[0] == S[len - 1]) {
      bool isRepKisuuEnd = false;
      bool isRepKisuuStart = false;
      bool tmp = false;      
      for(int i = 1; i < len; i++){
        if(S[len - 1 - i] != S[len - 1]){
          isRepKisuuEnd = (bool)((int)(i%2));
          tmp = true;
          break;
        }
      }
      if(tmp == false){
        isRepKisuuEnd = (bool)((int)(len%2));
      }
      tmp = false
      for(int i = 1; i<len;i++){
        if(S[i] != S[0]){
          isRepKisuuStart = (bool)((int)(i%2));
          break;
        }
      }
      if(tmp == false){
        isRepKisuuStart = (bool)((int)(len%2));
      }
      if(isRepKisuuEnd == true){
        if(isRepKisuuStart == true){
          cnt += (int)(K/2);
        }
      }
    }

    int cntCont = 1;
  	int cntSRpl = 0;

    for (int i = 1; i < len; i++) {
		if (S[i] == S[i - 1]) {
			cntCont += 1;
		}
		else {
			if (cntCont != 1) {
				cntSRpl += (int)(cntCont / 2);
				cntCont = 1;
			}
		}
	}
  if (cntCont != 1) {
    cntSRpl += (int)(cntCont / 2);
  }
  
  cout << cnt + cntSRpl * K;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:33:18: error: expected ';' before 'for'
   33 |       tmp = false
      |                  ^
      |                  ;
   34 |       for(int i = 1; i<len;i++){
      |       ~~~         
a.cc:34:22: error: 'i' was not declared in this scope
   34 |       for(int i = 1; i<len;i++){
      |                      ^
Language: C++

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

int main()
{
	string S;
	long K;
	char T;
	long cnt = 0;

	cin >> S >> K;

	int len = (int)(S.length());
	if(len == 1){
      	cout << 0;
		return 0;
    }
  	if (S[0] == S[len - 1]) {
      bool isRepKisuuEnd = false;
      bool isRepKisuuStart = false;
      
      for(int i = 1; i < len; i++){
        if(S[len - 1 - i] != S[len - 1]){
          isRepKisuuEnd = (bool)((int)(i%2));
          break;
        }
      }
      if(i == len){
        isRepKisuuEnd = (bool)((int)(len%2));
      }
      for(int i = 1; i<len;i++){
        if(S[i] != S[0]){
          isRepKisuuStart = (bool)((int)(i%2));
          break;
        }
      }
      if(i == len){
        isRepKisuuStart = (bool)((int)(len%2));
      }
      if(isRepKisuuEnd == true){
        if(isRepKisuuStart == true){
          cnt += (int)(K/2);
        }
      }
    }

    int cntCont = 1;
  	int cntSRpl = 0;

    for (int i = 1; i < len; i++) {
		if (S[i] == S[i - 1]) {
			cntCont += 1;
		}
		else {
			if (cntCont != 1) {
				cntSRpl += (int)(cntCont / 2);
				cntCont = 1;
			}
		}
	}
  if (cntCont != 1) {
    cntSRpl += (int)(cntCont / 2);
  }
  
  cout << cnt + cntSRpl * K;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:29:10: error: 'i' was not declared in this scope
   29 |       if(i == len){
      |          ^
a.cc:38:10: error: 'i' was not declared in this scope
   38 |       if(i == len){
      |          ^
Language: C++

#include<iostream>
using namespace std ;

int main()
{
  vector<string> S ;
  int K ;
  cin>>S>>K ;
  
  int flag=0,count=0 ;
  for(int i=1;i<S.size()-2;i++){
    if(S.at(i)==S.at(i+1)&&flag==0){
      flag=1 ;
      count++ ;
    }else if(flag==1) flag=0 ;
  }if(S.at(0)==S.at(S.size()-1)) count++ ;
  
  cout<<K*count<<endl ;
  
  return 0 ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<string> S ;
      |   ^~~~~~
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 | using namespace std ;
a.cc:6:16: error: expected primary-expression before '>' token
    6 |   vector<string> S ;
      |                ^
a.cc:6:18: error: 'S' was not declared in this scope
    6 |   vector<string> S ;
      |                  ^
Language: C++

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

int main(){
    string s;cin>>s;
    ll K;cin>>K;
    ll B=0;
    bool ok=false;
    REP(i,s.size()){
        if(s[i]!=s[i+1]) ok=true;
    }
    if(!ok){
        cout<<s.size()*K/2<<endl;
        return;
    }
    ok=false;
    REP(i,s.size()-1){
        if(s[i]==s[i+1]){
            if(i==s.size()-2) ok=true;
            B++;
            i++;
        }
    }
    if(s[0]!=s.back()||ok){
        cout<<B*K<<endl;
    }
    else{
        ll A=1;
        bool l=false;
        rep(i,1,s.size()-1){
            if(s[i]==s[i+1]){
                if(i==s.size()-2) l=true;
                A++;
                i++;
            }
        }
        if(!l){
            cout<<B+A*(K-1)<<endl;
        }
        else{
            cout<<B*((K+1)/2)+A*(K/2)<<endl;;
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
   18 |         return;
      |         ^~~~~~
Language: C++

#include <string>
#include <iostream>

using namespace std;

long long Solve(string S, long long K) {
    const int LENG = S.length();
    if (LENG == 1) return K / 2;

    if (LENG == 2) {
        if (S[0] == S[1]) return K;
        return 0LL;
    }

    long long ans = 0LL;
    for(int i=0; i<LENG-1; i++) {
        if (S[i] == S[i+1]) {
            ans++;
            if (i != LENG-2) {
                if (S[i] == S[i+2]) i++;
            }
        }
    }
    if (K==1) return ans;
    if (S[0] != S[LENG-1]) return ans*K;

    long long ans_composition=0LL;
    S = S + S;
    for(int i=0; i<2*LENG-1; i++) {
        if (S[i] == S[i+1]) {
            ans_composition++;
            if (1 != 2*LENG-1) {
                if (S[i] == S[i+2]) i++;
            }
    }
    return ans*K + (ans_composition-2*ans)*(K-1);
}

int main(){
    string S;
    cin >> S;
    long long K;
    cin >> K;
    cout << Solve(S,K) << endl;
    return 0;
}

Compiler output:
a.cc: In function 'long long int Solve(std::string, long long int)':
a.cc:39:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   39 | int main(){
      |         ^~
a.cc:39:9: note: remove parentheses to default-initialize a variable
   39 | int main(){
      |         ^~
      |         --
a.cc:39:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:39:11: error: a function-definition is not allowed here before '{' token
   39 | int main(){
      |           ^
a.cc:46:2: error: expected '}' at end of input
   46 | }
      |  ^
a.cc:6:40: note: to match this '{'
    6 | long long Solve(string S, long long K) {
      |                                        ^
a.cc:46:2: warning: control reaches end of non-void function [-Wreturn-type]
   46 | }
      |  ^
Language: C++

#include <string>
#include <iostream>

using namespace std;

long long Solve(string S, long long K) {
    const int LENG = S.length();
    if (LENG == 1) return K / 2;

    if (LENG == 2) {
        if (S[0]==S[1]) return K;
        else return 0;
    }

    long long ans=0LL;
    for(int i=0; i<LENG-1; i++) {
        if (S[i] == S[i+1]) {
            ans++;
            if (i != LENG-2) {
                if (S[i] == S[i+2]) S[i+1] = "M"s;
                else S[i] = "L"s;
            } else {
                S[i+1] = "R"s;
            }
        }
    }
    if (S[0] != S[LENG-1]) return ans*K;


    long long ans_composition=0LL;
    S = S + S;
    for(int i=0; i<2*LENG-1; i++) {
        if (S[i] == S[i+1]) ans_composition++;
    }
    ans = ans*K + ans_composition*(K-1);
    return ans;
}

int main(){
    string S;
    cin >> S;
    long long K;
    cin >> K;
    cout << Solve(S,K) << endl;
    return 0;
}

Compiler output:
a.cc: In function 'long long int Solve(std::string, long long int)':
a.cc:20:46: error: cannot convert 'std::__cxx11::basic_string<char>' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} in assignment
   20 |                 if (S[i] == S[i+2]) S[i+1] = "M"s;
      |                                              ^~~~
      |                                              |
      |                                              std::__cxx11::basic_string<char>
a.cc:21:29: error: cannot convert 'std::__cxx11::basic_string<char>' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} in assignment
   21 |                 else S[i] = "L"s;
      |                             ^~~~
      |                             |
      |                             std::__cxx11::basic_string<char>
a.cc:23:26: error: cannot convert 'std::__cxx11::basic_string<char>' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} in assignment
   23 |                 S[i+1] = "R"s;
      |                          ^~~~
      |                          |
      |                          std::__cxx11::basic_string<char>
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define INF 1000000007
#define int long long
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define rep(i, n) FOR(i, 0, n)
#define maxn 15

int gcd(int x, int y)
{
    if (x < y)
        swap(x, y);
    if (y == 0)
        return x;
    return gcd(x % y, y);
}

signed main()
{
    string S;
    int K;
    int ans = 0;
    cin >> S >> K;
    for (int i = 1; i < S.length(); i++)
    {
        if (S[i] == S[i - 1])
        {
            S[i] = '0';
            ans++;
        }
    }
    if (ans == S.lenth() - 1)
    {
        cout << ans * K / 2 << endl;
        return 0;
    }
    ans *= K;
    if (S[S.length() - 1] == S[0])
    {
        ans += K - 1;
    }
    cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:18: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'lenth'; did you mean 'length'?
   34 |     if (ans == S.lenth() - 1)
      |                  ^~~~~
      |                  length
Language: C++

#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<iomanip>
#include<vector>
#include<map>
using namespace std;

int main()
{
	long long int p = 0;
	long long int q = 0;
	long long int k,i;
	int flag = 0;
	int fin = 0;
	int head = 0;
	string s,t;

	cin >> s >> k;
	for (i = 0;i < s.length();i++)
	{
		if (s[i] == s[0])
			head++;
		else
			break;
	}
	if (head == s.length())
	{
		cout << s.length() * k / 2;
		return 0;
	}
	if (s[0] != s[s.length() - 1])
	{
		for (i = 0;i < s.length();)
		{
			if (s[i] == s[i + 1])
			{
				p++;
				i += 2;
			}
			else
				i++;
		}
		cout << p * k;
		return 0;
	}
	for (fin = 0;;)
	{
		if (s[s.length() - 1 - fin] == s[s.length() - 1])
			fin++;
		else
			break;
	}
	for (i = 0;i < s.length();)
	{
		if (s[i] == s[i + 1])
		{
			p++;
			i += 2;
		}
		else
			i++;
	}
	p *= k;
	p += (floor(head / 2) + floor(fin / 2) -floor(((head + fin) / 2))) * (k - 1);
	cout << p;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:66:15: error: 'floor' was not declared in this scope
   66 |         p += (floor(head / 2) + floor(fin / 2) -floor(((head + fin) / 2))) * (k - 1);
      |               ^~~~~
Language: Java

import java.util.*;
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuilder st = new StringBuilder("");
		StringBuilder ss = new StringBuilder(s);
		long k = sc.nextLong();
		long count = 0;
		char del = '$';
		int n = (int) s.length();
		for(int i = 0; i < n; i++)
			st.append(s.charAt(0));
		if (st ==  ss)
			System.out.println(s.length() * k / 2);
		else {
		for (int i = 0; i < ss.length() - 1; i++){
			if (ss.charAt(i % n) == ss.charAt((i + 1) % n)){
				ss.setCharAt(i + 1, del);
				count++;
				i++;
				}
			}
		int count1 = 0;
		for (int i = 0; n < 2 * n; i++){
			if (ss.charAt(i % n) == ss.charAt((i + 1) % n))
				ss.setCharAt(i + 1, del);
				count1++
				i++;
		}
			System.out.println(count + (count1 - count) * k - 1);
		}
	}
}


Compiler output:
Main.java:28: error: ';' expected
				count1++
				        ^
1 error
Language: Java

import java.util.*;
class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuilder st = new StringBuilder("");
		StringBuilder ss = new StringBuilder(s);
		long k = sc.nextLong();
		long count = 0;
		char del = '$';
		int n = (int) s.length();
		for(int i = 0; i < n; i++)
			st.append(s.charAt(0));
		if (st ==  ss)
			System.out.println(s.length() * k / 2);
		else {
		for (int i = 0; i < ss.length() - 1; i++){
			if (ss.charAt(i % n) == ss.charAt((i + 1) % n)){
				ss.setCharAt(i + 1, del);
				count++;
				i++;
				}
			}
		int count1 = 0;
		for (int i = 0; n < 2 * n; i++){
			if (ss.charAt(i % n) == ss.charAt((i + 1) % n))
				ss.setCharAt(i + 1, del);
				count1++
				i++;
		}
			System.out.println(count + (count1 - count) * k - 1);
		}
	}
}


Compiler output:
Main.java:28: error: ';' expected
				count1++
				        ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string a;
  cin>>a;
  int64_t n;
  cin>>n;
  int s=a.size();
  if(a==string(s,a[0])){
    cout<<s*n/2<<endl;
  }
  else{
    int ans1 = 0;
    for (int i = 0; i + 1 < n; i++) {
      if (s[i % n] == s[(i + 1) % n]) {
        ++ans1;
        ++i;
      }
    }
    int ans2 = 0;
    for (int i = 0; i + 1 < 2 * n; i++) {
      if (s[i % n] == s[(i + 1) % n]) {
        ++ans2;
        ++i;
      }
    }
    cout << ans1 + (ans2 - ans1) * (k - 1) << '\n';
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:12: error: invalid types 'int[int64_t {aka long int}]' for array subscript
   15 |       if (s[i % n] == s[(i + 1) % n]) {
      |            ^
a.cc:15:24: error: invalid types 'int[int64_t {aka long int}]' for array subscript
   15 |       if (s[i % n] == s[(i + 1) % n]) {
      |                        ^
a.cc:22:12: error: invalid types 'int[int64_t {aka long int}]' for array subscript
   22 |       if (s[i % n] == s[(i + 1) % n]) {
      |            ^
a.cc:22:24: error: invalid types 'int[int64_t {aka long int}]' for array subscript
   22 |       if (s[i % n] == s[(i + 1) % n]) {
      |                        ^
a.cc:27:37: error: 'k' was not declared in this scope
   27 |     cout << ans1 + (ans2 - ans1) * (k - 1) << '\n';
      |                                     ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long ll;
ll c,d,k;
int main(){
  string s,t;
  cin>>s>>k;
  ll n=s.size();
  if(s == string(n,s[0]))cout<<n*k/2<<endl;
  else{
    t=s+s;
    rep(i,s.size()-1)if(s[i]==s[i+1])s[i+1]='#',c++;
    rep(i,t.size()-1)if(t[i]==t[i+1])t[i+1]='#',d++;
    cout<c+(d-c)*(k-1)<<endl;
  }
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:15:23: error: invalid operands of types 'll' {aka 'long long int'} and '<unresolved overloaded function type>' to binary 'operator<<'
   15 |     cout<c+(d-c)*(k-1)<<endl;
      |          ~~~~~~~~~~~~~^~~~~~
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <functional>

using namespace std;

typedef long long ll;

#define rep(i,n) for(ll (i) = 0; (i) < (n); (i)++)

int main(void){
    string S;
    ll K;
    ll ans = 0;
    cin >> S;
    cin >> K;

    ll size = S.size();
    ll ren = 0;
    vector<char> vec;
    rep(i,size) vec.emplace_back(S[i]);
    vec.emplace_back('0');
    //bool rcan = false;
    rep(i,size){
        if(vec[i] == vec[i+1]){
            ren++;
            rcan = true;
        }else if(rcan){
            ren++;
        }
    }
    if (ren == size || size == 1){
        cout << size * K/2 << endl;
        return 0;
    }
    if(vec[0] == vec[size-1]){
        ans = ren;
        ren+=1;
    }else ans = ren;
    rep(i,K-1) ans += ren;
    cout << ans/2 << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:29:13: error: 'rcan' was not declared in this scope
   29 |             rcan = true;
      |             ^~~~
a.cc:30:18: error: 'rcan' was not declared in this scope
   30 |         }else if(rcan){
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>

#define PI 3.14159265358979323846264338327950288419

using namespace std;

char str[205];
int copies, len;

long long ans;

int compute(){
	int prev = 0, ret = 0;
	for(int i = 1; i < len; i++){
		if(str[i] != str[i - 1]){
			ret += (i - prev) / 2;
			prev = i;
		}
	}
	ret += (len - prev) / 2;
	return ret;
}

int main(){
	gets(str);
	len = strlen(str);
	scanf("%d", &copies);
	bool monochrome = true;
	for(int i = 1; i < len; i++){
		if(str[i] != str[0]){
			monochrome = false;
		}
	}
	
	if(monochrome){
		ans = 1LL * len * copies / 2;
	}
	else{
		int a1 = compute();
		for(int i = len; i < len + len; i++){
			str[i] = str[i - len];
		}
		len += len;
		int a2 = compute();
		ans = a1 + 1LL * (a2 - a1) * (copies - 1);
	}
	printf("%lld\n", ans);
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:25:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   25 |         gets(str);
      |         ^~~~
      |         getw
Language: C

#include<stdio.h>

int main() {
  unsigned long long char s[];
  unsigned long long int k, i, a = 0, b = 0;

  for(i = 1;s[i] == '\n';i++) {
    if(s[i - 1] == s[i]) {
      a++;
  	}
  }
  
  if(s[0] == s[i]) {
    b = 1;
  }
  
  printf("%lld", a * k + b *(i - 1));

Compiler output:
main.c: In function 'main':
main.c:4:22: error: both 'long' and 'char' in declaration specifiers
    4 |   unsigned long long char s[];
      |                      ^~~~
main.c:4:27: error: array size missing in 's'
    4 |   unsigned long long char s[];
      |                           ^
main.c:17:3: error: expected declaration or statement at end of input
   17 |   printf("%lld", a * k + b *(i - 1));
      |   ^~~~~~
Language: C++

#include<bits/stdc++.h>
int main(){
  string s[4];
  long long k,a[4]={};
  std::cin>>s[0]>>k;
  for(size_t i=0;i<3;++i) s[i+1]=s[i]+s[0];
  for(size_t i=0;i<4;++i) for(size_t j=0;j<s[i].length()-1;++j) if(s[i][j]==s[i][j+1]) ++a[i],s[i][j+1]='.';
  if(k&1) std::cout<<a[0]+(a[2]-a[0])*(k/2)<<std::endl;
  else std::cout<<a[1]+(a[3]-a[1])*(k/2-1)<<std::endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'string' was not declared in this scope
    3 |   string s[4];
      |   ^~~~~~
a.cc:3:3: 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:5:13: error: 's' was not declared in this scope
    5 |   std::cin>>s[0]>>k;
      |             ^
Language: C

#include <bits/stdc++.h>
#define FOR(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define FORUL(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
#define FORULE(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define FOREACH(it, X) for(__typeof((X).begin()) it = (X).begin(); it != (X).end(); it++)
#if defined(_MSC_VER) || __cplusplus > 199711L
#define AUTOVAR(newvar,v) auto newvar = (v)
#else
#define AUTOVAR(newvar,v) __typeof(newvar) r = (v)
#endif
#define PB(x) push_back(x)
#define MP(x,y) make_pair((x),(y))
#define MEMSET(m,v) memset(m,v,sizeof(m))

typedef long long				 ll;
typedef unsigned long long		ull;

#define DEBUG 0

#if DEBUG
#define DOUT cout<<"["<<__LINE__<<"]:"
#else
#define DOUT 0 && cout
#endif

using namespace std;

string S;
int K;
list<pair<int,int> > series;

int main(int argc, char *argv[])
{
	ios::sync_with_stdio(false);

	cin >> S;
	cin >> K;

	char prev = '\0';
	list<pair<int,int>>::iterator sit = series.end();
	int rep = K>=2?2:1;
	DOUT << "rep="<<rep<<endl;
	FOR(n, S.length()*rep) {
		int pos = n%S.length();
		char curr = S[pos];
		DOUT << "["<<n<<"]:prev="<<prev<<endl;
		DOUT << "["<<n<<"]:curr="<<curr<<endl;
		if (prev==curr) {
			if(sit!=series.end()) {
				sit->second = n;
			}
			else {
				pair<int,int> aseries;
				aseries.first = n-1;
				aseries.second = n;
				series.push_back(aseries);
				sit = series.end();
				sit--;
			}
		}
		else {
			if(sit!=series.end()) {
				sit = series.end();
			}
		}
		prev = curr;
	}

	// int headpart = 0;
	// int mid = 0;
	// int connpart = 0;
	// int lastpart = 0;
	ll ans = 0;
	sit = series.begin();
	for(;sit!=series.end();sit++) {
		DOUT << "sit->first="<<sit->first<<", sit->second="<<sit->second<<endl;

		int length = sit->second - sit->first + 1;
		if(sit->first==0) {
			if(sit->second<S.length()-1) {
				// head part of the 1st part
				DOUT << "[1]ans+=length/2=="<<length/2 <<endl;
				ans+=length/2;
			}
			else {
				// head part and 1st and 2nd is connected.
				ans+=((ll)S.length()*K)/2;
				break;
			}
		}
		else if (sit->second<S.length()) {
			// mid part of 1st part
			DOUT << "[3]ans+=(length/2)*K=="<<((ll)length/2)*K <<endl;
			ans += ((ll)length/2)*K;
		}
		else if (sit->second<(S.length()*2)-1) {
			// 2nd part and 1st part
			if(sit->first<S.length()) {
				ans += ((ll)length/2)*(K-1);
				DOUT << "[4]ans+=(length/2)*(K-1)=="<<((ll)length/2)*(K-1) <<endl;
			}
			else {
				DOUT << "[5] do nothing" <<endl;
				// mid part of 2nd part
				// already counted
			}
		}
		else if (sit->second>=(S.length()*2)-1) {
			// last part of 2nd part
			if(sit->first>S.length()) {
				DOUT << "[6]ans+=length/2=="<<length/2 <<endl;
				ans += length/2;
			}
			else {
				// 1st part and 2nd part is connecting
				// already counted.
				assert(0);
			}
		}
	}

	cout << ans << endl;


	return 0;
}




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

#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;

int main(void){
    string str;
    long long kaisuu,m;
    int mojisuu;
    long long ans=0;
    long long ans1=0;
    cin >> str ;
    cin >> kaisuu;
    size_t size = str.length();
    mojisuu = size;
    int q=0;




    if(mojisuu!=1){

        
        for(int i=0;i<mojisuu;i++){
            if(str[i]!=str[i+1]){q++;}
            else{q--;}
        }
        if(q==mojisuu-1 && mojisuu %2 ==1){printf("%lld",(mojisuu*kaisuu-1)/2);}
        else{



    if(str[0]==str[mojisuu-1]){
        ans++;
        
    }

    if(str[0]==str[mojisuu-1] && str[mojisuu-1]==str[mojisuu-2]){ans--;}
    else if(str[0]==str[1] && str[1]==str[mojisuu-2]){ans--;}
    
    if(str[0]==str[1] && str[mojisuu-1]==str[mojisuu-2] && str[1]==str[mojisuu-1]){ans}


    for(long long i=0;i<mojisuu;i++){
        if(str[i]==str[i+1]){
            for(int j=i;j<mojisuu-i;j++){
                str[j]=str[j+2];
            }
            mojisuu-=2;
            ans1++;
            i--;
        }
        else{;}
    }




    m=ans*(kaisuu-1)+ans1*kaisuu;

    printf("%lld",m);

        }
    }
    else{
        printf("%lld",kaisuu-1);
    }
        
}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:87: error: expected ';' before '}' token
   41 |     if(str[0]==str[1] && str[mojisuu-1]==str[mojisuu-2] && str[1]==str[mojisuu-1]){ans}
      |                                                                                       ^
      |                                                                                       ;
Language: C++

from collections import Counter
def main():
    s = input()
    k = int(input())
    li = []
    num = 1
    if len(s) == 1:
        li.append(1)
    for i in range(len(s)-1):
        if s[i] != s[i+1]:
            li.append(num)
            num = 1
        else:
            num += 1
    li.append(num)
    temp = 0
    ans = 0
    if len(list((Counter(li).keys()))) == 1:
        ans += len(s) * k // 2
    else:
        for i in li:
            temp += i//2
        if s[0] != s[-1]:
            ans = temp * k
        else:
            li[0] += li[-1]
            for i in li[:-1]:
                ans += i//2
            ans = ans * (k-1) + temp
    print(ans)

main()


Compiler output:
a.cc:1:1: error: 'from' does not name a type
    1 | from collections import Counter
      | ^~~~
Language: C++

s = list(input())
k = int(input())

l = len(s)
flag = 0
for i in range(1,l):
    if(s[i]!=s[i-1]):
        flag=1


flag2 = 0
cnt = 0

if(flag==0):
    a = (l*k)//2
    print(a)
else:
    if(l==1):
        print(k//2)
    else:
        i=1
        while(i<l):
            if((s[i]==s[i-1])):
                cnt+=1
                i+=2
            else:
                i+=1
        
        if(s[0]==s[l-1] and s[l-1]==s[l-2] and s[0]==s[1]):
            flag2=1

        print(flag2)
        if(flag2==1):
            if(k==1):
                print(cnt)
            else:
                print(cnt*k+k-1)
        else:
            print(cnt*k)


Compiler output:
a.cc:1:1: error: 's' does not name a type
    1 | s = list(input())
      | ^
Language: C

#include<stdio.h>
#include<string.h>

int main(){
    int i;
    char str[201];
    unsigned long n,count =0;

    scanf("%s\n%ld",str,&n);
    for(i=1; str[i]!='\0'; i++){
        if(str[i-1]==str[i]){
            count++;
            if(str[i]==str[i+1]){
                i++;
            }
        }
    }
	count *= n;
  	if(str[0]==str[i-1]){
      if(str[0]!=str[i-2]){
        count += n-1;
      }
   	}
      /*
  	if(i == 1){
      if(n%2==0){
        count = n/2;
      }else{
        count = (n-1)/2;
      }*/
    }/*
  	int k,j=0;
  	if((i>=3)&&((i%2!=0))){
  		for( k=	0; str[k]==str[k+1]; k++);
  		if(k+1==i){
      		if(n%2==0){
          	count = (k+1)*(n/2);
        	}else{
          	count = (k+1)*((n-1)/2) + k+1-3;
        	}
        }
	}*/
    printf("%ld\n",count);
    return 0;
}

Compiler output:
main.c:43:12: error: expected declaration specifiers or '...' before string constant
   43 |     printf("%ld\n",count);
      |            ^~~~~~~
main.c:43:20: error: unknown type name 'count'
   43 |     printf("%ld\n",count);
      |                    ^~~~~
main.c:44:5: error: expected identifier or '(' before 'return'
   44 |     return 0;
      |     ^~~~~~
main.c:45:1: error: expected identifier or '(' before '}' token
   45 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); i++)
#define repd(i,a,b) for (int i = (a); i < (b); i++)
typedef long long ll;
int main(void)
{
	string S;
	cin >> S;
	ll K;
	cin >> K;
	ll count = 0;
	ll count1 = 1;
	ll count2 = 1;
	int k;
	ll l = S.size();
	
	k = 0;
	while(S[k] == S[k+1])
	{
		count1++;
		k++;
	}
	
	k = l - 1;
	while(S[k-1] == S[k])
	{
		count2++;
		k--;
	}
	
	if (l == 1)
	{
		cout << K - 1 << endl;
	}
	else if (l = count1)
	{
		cout << l * K / 2 << endl;
	}
	else
	{
		rep(i, l - 1)
		{
			if (S[i] == S[i + 1])
			{
				count++;
				i++;
			}
		}
		ll ans = count * K;
		
		if (S[0] == S[l - 1] && (count1+count2) % 2 == 0 && count1 % 2 == 1)
		{
			ans -= ()(count1/2)+(count2/2)-()(count1+count2)/2))*K - 1;
		}
		cout << ans << endl;
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:54:33: error: expected primary-expression before ')' token
   54 |                         ans -= ()(count1/2)+(count2/2)-()(count1+count2)/2))*K - 1;
      |                                 ^
a.cc:54:57: error: expected primary-expression before ')' token
   54 |                         ans -= ()(count1/2)+(count2/2)-()(count1+count2)/2))*K - 1;
      |                                                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); i++)
#define repd(i,a,b) for (int i = (a); i < (b); i++)
typedef long long ll;
int main(void)
{
	string S;
	cin >> S;
	ll K;
	cin >> K;
	ll count = 0;
	ll count1 = 1;
	ll count2 = 1;
	int k;
	ll l = S.size();
	
	k = 0;
	while(S[k] == S[k+1])
	{
		count1++;
		k++;
	}
	
	k = l - 1;
	while(S[k-1] == S[k])
	{
		count2++;
		k--;
	}
	if (count1+count2 == 2*S.size())
	{
		ans--;
	}
	
	if (l == 1)
	{
		cout << K - 1 << endl;
	}
	else if (l = count1)
	{
		cout << l * K / 2;
	}
	else
	{
		rep(i, l - 1)
		{
			if (S[i] == S[i + 1])
			{
				count++;
				i++;
			}
		}
		ll ans = count * K;
		
		if (S[0] == S[l - 1] && (count1+count2) % 2 == 0 && count1 % 2 == 1)
		{
			ans += K - 1;
		}
		cout << ans << endl;
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:33:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   33 |                 ans--;
      |                 ^~~
      |                 abs
Language: C++

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

int main() {
    string s;
    int64_t k;
    cin >> s >> k;
    if(s.size() == 1) {
        cout << k / 2 << endl;
        return 0;
    }
    int64_t ans = 0;
    vector<int> cnt_same = {1};
    REP(i, s.size() - 1) {
        if(s[i] == s[i + 1]) {
            cnt_same.back() ++;
        } else {
            cnt_same.push_back(1);
        }
    }
    int cnt_front = cnt_same.front();
    int cnt_back = cnt_same.back();
    bool flag = false;
    if(s[0] == s.back() && cnt_same.size() >= 2 && k >= 2) {
        flag = true;
        // cnt_same.front() += cnt_same.back();
        // cnt_same.pop_back();
    }
    REP(i, cnt_same.size()) ans += cnt_same[i] / 2;
    ans *= k;
    if(flag) {
        // ans -= cnt_same.front() / 2;
        ans += (k-1)*(cnt_front / 2 + cnt_back / 2 - cnt_same.front() / 2};
    }
    cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:35:74: error: expected ')' before '}' token
   35 |         ans += (k-1)*(cnt_front / 2 + cnt_back / 2 - cnt_same.front() / 2};
      |                      ~                                                   ^
      |                                                                          )
a.cc:35:74: error: expected ';' before '}' token
   35 |         ans += (k-1)*(cnt_front / 2 + cnt_back / 2 - cnt_same.front() / 2};
      |                                                                          ^
      |                                                                          ;
a.cc: At global scope:
a.cc:37:5: error: 'cout' does not name a type
   37 |     cout << ans << endl;
      |     ^~~~
a.cc:38:1: error: expected declaration before '}' token
   38 | }
      | ^
Language: C++

#include<iostream>
#include<bits/stdc++.h>
#include<conio.h>
 
using namespace std;
 
int main(){
    int c=0;
	string s,t;
  	long long int k;
  	cin>>s>>k;
  	for(int j=0;j<s.length()-1;j++){
      if(s[j]==s[j+1]){
        s[j+1]=rand()%26+97;
        c++;
      }
    }
  	if(s[0]==s[s.length()-1]){
      s[s.length()-1]=s[s.length()-2]-3;
      c++;
    }
  	cout<<c*k;
  	cout<<s;
  	getch();
  	return 0;
}

Compiler output:
a.cc:3:9: fatal error: conio.h: No such file or directory
    3 | #include<conio.h>
      |         ^~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(ll (i) = (0);(i) < (n);++i)
#define REV(i,n) for(ll (i) = (n) - 1;(i) >= 0;--i)
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define FI first
#define SE second
#define SHOW1d(v,n) {REP(WW,n)cerr << v[WW] << ' ';cerr << endl << endl;}
#define SHOW2d(v,WW,HH) {REP(W_,WW){REP(H_,HH)cerr << v[W_][H_] << ' ';cerr << endl;}cerr << endl;}
#define ALL(v) v.begin(),v.end()
#define Decimal fixed<<setprecision(20)
#define INF 1000000000
#define LLINF 1000000000000000000LL
#define MOD 998244353

typedef long long ll;
typedef pair<ll,ll> P;

int main(){
	cin.tie(0);cout.tie(0);ios::sync_with_stdio(false);

	ll ans = 0;
	string str;cin >> str;
	ll k;cin >> k;

	bool flag = true;
	REP(i, n-1){
		if(str[i] != str[i+1])flag = false;
	}
	if(flag){
		cout << n * k / 2 << endl;
		return 0;
	}

	for(int i = 1;i < str.size();i++){
		if(str[i] == str[i-1]){
			str[i] = '#';
			ans += k;
		}
		else if(i == str.size() - 1 && str[i] == str[0]){
			ans += k - 1;
		}
	}

	cout << ans << endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:16: error: 'n' was not declared in this scope
   31 |         REP(i, n-1){
      |                ^
a.cc:5:42: note: in definition of macro 'REP'
    5 | #define REP(i,n) for(ll (i) = (0);(i) < (n);++i)
      |                                          ^
a.cc:35:25: error: 'n' was not declared in this scope
   35 |                 cout << n * k / 2 << endl;
      |                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string a;
  cin>>a;
  int64_t n;
  cin>>n;
  int w=1;
  int kk=0;
  a.push_back('<');
  for(int i=0;i<a.size()-1;i++){
    
    
    if(a[i]==a[i+1]){
      w++;
    }
    else if(w!=1){

      kk+=w/2;
      w=1;
    }
    
  }

  int64_t ans=kk*n;
  


  if(a[0]==a[a.size()-2]){
    
  int g=1;
  int e=1;
  
  for(int i=0;i<a.size()-1;i++){
    if(a[i]!=a[i+1]){
      if(i==0){
        g=0;
      }
      break;
    }
    else if(a[i]==a[a.size()-2]){
      g=0;
      break;
    }
    else{
      g++;
    }
    
  }
  for(int i=a.size()-;i>0;i--){
    if(a[i]!=a[i-1]){
      if(i==a.size()){
        e=0;
      }
      break;
    }
    else if(a[i]==a[1]){
      e=0;
      break;
    }
    else{
      e++;
    }
  }
  if(g%2==1 && e%2==1){
    ans+=n-1;
  }
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:50:22: error: expected primary-expression before ';' token
   50 |   for(int i=a.size()-;i>0;i--){
      |                      ^
Language: C++

#include <bits/stdc++.h>
#define INF 1e18
#define int long long
#define Rep(i, a, n) for (int i = (a); i < (n); i++)
#define rep(i, n) Rep(i, 0, n)
#define all(a) (a).begin(), (a).end()
using namespace std;
typedef pair<int, int> P;
typedef pair<int, P> PP;
const int mod = 1000000007;

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    string s;
    int k;
    cin >> s >> k;
    int cnt = 1, res1 = 0;
    rep(i, s.size())
    {
        if (s[i] == s[i + 1])
            cnt++;
        else
        {
            res1 += cnt / 2;
            cnt = 1;
        }
    }
    ans += cnt / 2;
    cnt = 0;
    s += s;
    int res2 = 0;
    rep(i, s.size())
    {
        if (s[i] == s[i + 1])
            cnt++;
        else
        {
            res2 += cnt / 2;
            cnt = 1;
        }
    }
    res2 += cnt / 2;
    cout << (k - 1) * res2 - k * res1 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 |     ans += cnt / 2;
      |     ^~~
      |     abs
Language: C++

#include <bits/stdc++.h>
#define INF 1e18
#define int long long
#define Rep(i, a, n) for (int i = (a); i < (n); i++)
#define rep(i, n) Rep(i, 0, n)
#define all(a) (a).begin(), (a).end()
using namespace std;
typedef pair<int, int> P;
typedef pair<int, P> PP;
const int mod = 1000000007;

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    string s;
    int k;
    cin >> s >> k;
    int cnt = 1, res1 = 0;
    rep(i, s.size())
    {
        if (s[i] == s[i + 1])
            cnt++;
        else
        {
            res1 += cnt / 2;
            cnt = 1;
        }
    }
    ans += cnt / 2;
    cnt = 0;
    s += s;
    int res2 = 0;
    rep(i, s.size())
    {
        if (s[i] == s[i + 1])
            cnt++;
        else
        {
            res2 += cnt / 2;
            cnt = 1;
        }
    }
    res2 += cnt / 2;
    cout << (n - 1) * res2 - n * res1 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 |     ans += cnt / 2;
      |     ^~~
      |     abs
a.cc:46:14: error: 'n' was not declared in this scope
   46 |     cout << (n - 1) * res2 - n * res1 << endl;
      |              ^