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

/* Aditya0412 */
#include <bits/stdc++.h>
using namespace std; 
typedef long long int ll;
#define pb push_back 
#define ve vector
#define vii vector < int >
#define vll vector < ll > 
#define pii pair < int , int >
#define pll pair < ll , ll >
#define vpl vector < pll >
#define fi first
#define all(a)      (a).begin(),(a).end()
#define si(x)       (int)((x).size())
#define debug(x)    cout<<#x<<" is "<<(x)<<endl;cout.flush();  
#define se second 
#define endl        '\n'
#define f(i,a,b)    for(int i=a;i<b;i++)
#define mem(a,x)          memset(a,x,sizeof(a))

// === Debug macro starts here ===

int recur_depth = 0;
#ifdef DEBUG
#define dbg(x) {++recur_depth; auto x_=x; --recur_depth; cerr<<string(recur_depth, '\t')<<"\e[91m"<<__func__<<":"<<__LINE__<<"\t"<<#x<<" = "<<x_<<"\e[39m"<<endl;}
#else
#define dbg(x)
#endif
template<typename Ostream, typename Cont>
typename enable_if<is_same<Ostream,ostream>::value, Ostream&>::type operator<<(Ostream& os,  const Cont& v){
    os<<"[";
    for(auto& x:v){os<<x<<", ";}
    return os<<"]";
}
template<typename Ostream, typename ...Ts>
Ostream& operator<<(Ostream& os,  const pair<Ts...>& p){
    return os<<"{"<<p.first<<", "<<p.second<<"}";
}

// === Debug macro ends here ===


// const ll mod=998244353;
const ll mod = 1000000000+7;
const ll N=1000000+6;
#define M_PI           3.14159265358979323846
void inp(ll *arr,ll n)
{
  for(int i=0;i<n;i++)
    cin>>arr[i];
}
void inp_mat(ll *arr,ll n,ll m)
{
    for(int i=0;i<n;i++)
      for(int j=0;j<m;j++)
        {
          ll x;cin>>x;
          *((arr+i*m) + j)=x;
        }
}
// syntax for inp_mat inp_mat((ll *)arr,n,m);
// int x2[]={+1,-1,+0,+0};
// int y2[]={+0,+0,+1,-1};
int main() 
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    //  #ifndef ONLINE_JUDGEc
    //   freopen ("INPUT.txt" , "r" , stdin);
    //   freopen ("OUTPUT.txt", "w" , stdout);
    // #endif 
    int t=1;
    // cin>>t;
    while(t--)
    {
        int n;cin>>n;
        cout<<a+(a*a)+(a*a*a);
    }    
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:78:15: error: 'a' was not declared in this scope
   78 |         cout<<a+(a*a)+(a*a*a);
      |               ^
Language: C++

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
#pragma GCC target("sse,sse2,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define watch(x) cout <<(#x)<<" is "<<(x)<<endl
#define debug cout <<"hi"<<endl
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
const int MOD=1e9+7;
const int INF32=1<<30;
const ll INF64=1LL<<60;

int main(){
  ios_base::sync_with_stdio(0); cin.tie(0);
  int a; cin >>a;
  cout <<a+a*a+a*a*a;
}
return 0;}

Compiler output:
a.cc:19:1: error: expected unqualified-id before 'return'
   19 | return 0;}
      | ^~~~~~
a.cc:19:10: error: expected declaration before '}' token
   19 | return 0;}
      |          ^
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main(){
  int a;
  cin >> a;
  cout << a + a ** 2 + a ** 33 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:18: error: invalid type argument of unary '*' (have 'int')
    7 |   cout << a + a ** 2 + a ** 33 << endl;
      |                  ^~~
a.cc:7:27: error: invalid type argument of unary '*' (have 'int')
    7 |   cout << a + a ** 2 + a ** 33 << endl;
      |                           ^~~~
Language: C++

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


int main() {
  int a;
  cin >> a;
  
  int b=a*a
    
  cout << a+b+a*b <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: expected ',' or ';' before 'cout'
   12 |   cout << a+b+a*b <<endl;
      |   ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
     
#define ll long long
#define loop(i,a,n) for(ll i=a;i<n;++i)
#define revloop(i,a,b) for(ll i=a;i>=b;--i)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define INF 99999999999999999
#define MOD 1000000007

void func()
{
    ll n;
    cin>>n;
    ll ans=a+(a*a)+(a*a*a);
    cout<<ans<<"\n";
}
 
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
 
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r" , stdin);
    freopen("output.txt", "w" , stdout);
    #endif
 
    ll t=1;
    //cin>>t;
    while(t--)
    {
        func();
    }
}

Compiler output:
a.cc: In function 'void func()':
a.cc:18:12: error: 'a' was not declared in this scope
   18 |     ll ans=a+(a*a)+(a*a*a);
      |            ^
Language: C++

#include <bits/stdc++.h>
#define int long long int
#define ii pair<int,int>
#define fi first
#define se second
#define mp make_pair
#define pb push_back
using namespace std;
#define output(x) for (auto a:x) cout<<a<<" ";cout<<endl;
#define output2(x) for (auto a:x) cout<<a.fi<<" "<<a.se<<endl;
#define PI 3.14159265
#define all(x) x.begin(),x.end()

// DEBUG TEMPLATE
#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
  enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (auto it = d.b; it != d.e; ++it)
  *this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
  
// DEBUG TEMPLATE ENDS

#define MOD 1000000007
int power(int x,int y,int mod = MOD) 
{ 
  int ret = 1;
  x = x % mod;
  while (y){
    if(y&1) ret = (ret*x)%mod;
    y = y>>1;
    x = (x*x)%mod;
    } 
    return ret%mod; 
}

int num(int l,int r,int d){
  if (l>r) return 0;
  return ((r-l)/d + 1);
}

int sum(vector<int> x){
  int ret = 0;
  for (auto y:x) ret = (ret+y)%MOD;
  return ret%MOD;
}

void solve(int n)
{ 
  int a;
  cin>>a;
  cout<<a + a*a + a*a*a<<endl;
}


/*
  
*/
signed main(){
  int t = 1;
  // cin>>t;
  while (t--)
  solve();
}
// Check MOD values plox :(


Compiler output:
a.cc: In function 'int main()':
a.cc:85:8: error: too few arguments to function 'void solve(long long int)'
   85 |   solve();
      |   ~~~~~^~
a.cc:70:6: note: declared here
   70 | void solve(int n)
      |      ^~~~~
Language: C++

#include <bits\stdc++.h>
#define mod 1000000000+7;
typedef long long ll;
using namespace std;


int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); 
	ll a; cin >> a;
	cout << a+a*a+a*a*a << "\n";	

}


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

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pi;
typedef pair<ll, ll> pll;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;

#define imx INT_MAX
#define imn INT_MIN
#define llmx LLONG_MAX
#define llmn LLONG_MIN
#define INF         100000000000000000
#define PI          3.1415926535897932384626433832795l



#define fi first
#define se second
#define pb push_back
#define f_s(a) sort(a.begin(), a.end())
#define b_s(a) sort(a.rbegin(), a.rend())
#define p(a) cout<<a<<"\n"


// ll mod = 1000000007;
// #define l(i, )
// #define rl(i, a, b) for(int i = a; i < b; i++)






// struct mycomp {
//     bool operator() (const pair<int,int> &a, const pair<int,int> &b) const{
//         if (a.second-a.first != b.second-b.first)
//         return (a.second-a.first > b.second-b.first);
//         return a.first < b.first;
//     }
// };



/////////////////////GCD//////////////////////
ll gcd(ll a, ll b)
{
	if(b==0) return a;
	return gcd(b, a%b);
}


ll extended_gcd(ll a, ll b, ll& x, ll& y)
{
	if(b==0)
	{
		x=1;
		y=0;
		return a;
	}
	ll x1, y1;
	ll d = extended_gcd(b, a%b, x1, y1);
	x=y1;
	y=x1-y1*(a/b);
	return d;
}

////////////////////SIEVE OF ERATOSTHENES//////////////////////
vector<int> sieveoferatosthenes(int n)
{
	vector<bool> prime(n+1, true);
	for(int i = 2; i <= sqrt(n); i++)
	{
		if(prime[i])
		{
			for(int j = i*i; j<=n; j+=i)
			{
				prime[j]=false;
			}
		}
	}	
	vector<int> all_primes;
	for(int i = 2; i <=n; i++)
	{
		if(prime[i]) all_primes.pb(i);
	}
	return all_primes;
}

////////////////////BINARY EXPONENTIATION///////////////////////
ll bin_exp(ll a, ll b, ll mod)
{
	ll ans = 1;
	while(b)
	{
		if(b%2)
		{
			b--;
			ans = (ans%mod*a%mod)%mod;
		}
		b/=2;
		a = (a%mod*a%mod)%mod;
	}
	return ans;
}


///////////////////////////BFS//////////////////////////////////
void bfs(vector<int>& distance, vector<int> a[], vector<bool>& visited, int u, vector<int>& parent)
{
	visited[u]=true;
	parent[u]=-1;
	distance[u]=0;
	queue<int> q;

	q.push(u); 
    while (!q.empty()) { 
  
        int f = q.front(); 
        q.pop(); 
  		for(int i =0; i < a[f].size(); i++)
  		{
  			if(visited[a[f][i]]==false)
  			{
  				distance[a[f][i]]=distance[f]+1;
  				parent[a[f][i]]=f;
  				visited[a[f][i]]=true;
  				q.push(a[f][i]);
  			}
  		}
    } 

}

void solve()
{

}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	// #ifndef ONLINE_JUDGE
	// freopen("input.txt", "r", stdin);
	// freopen("output.txt", "w", stdout);
	// #endif
	int n;
	cin>>n;
	cout<<a+a*a+a*a*a<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:155:15: error: 'a' was not declared in this scope
  155 |         cout<<a+a*a+a*a*a<<endl;
      |               ^
Language: C++

#include <iostream>
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define lli long long int
using namespace std;
#define S second
#define F first
#define pb push_back 
#define M1 1000000007
#define M2 998244353
#define plli pair<lli,lli>
#define setit set<lli>::iterator seti
#define mapit map<lli,lli> ::iterator mapi
#define MP make_pair
#define MT make_tuple
#define PI 3.14159265358979323846
// map      iterator->first  iterator.first
// map      mp[key]=value
// set      *s.begin()
// vector   v[j]=value
// pair     p.first p.second
// vector of pairs v[j].first v[j].second
// tuple    get<index>(tuple_name)
// vector of tuples get<index>(v[j])  sort(v.begin(),v.end())
//priority queue .top() .pop() .push()
// __gcd(x,y)
#define mini(x,y) (y + ((x - y) & ((x - y) >>(sizeof(int) * CHAR_BIT - 1))))
#define maxi(x,y) (x - ((x - y) & ((x - y) >> (sizeof(int) * CHAR_BIT - 1))))
#define fr(j,a,b) for(j=a;j<b;j++)

int power(int x, unsigned int y, int p)  
{    int res = 1;    
     x = x % p;
     if (x == 0) return 0;
     while (y > 0)  
     {  if (y & 1)  
        res = (res*x) % p;  
        y = y>>1;
        x = (x*x) % p;  
     }  
    return res;  
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    lli t,i,j,n,x;
    
        cin>>n;
        cout<<(n)+(n*n)+(n*n*);

    
}



Compiler output:
a.cc: In function 'int main()':
a.cc:53:30: error: expected primary-expression before ')' token
   53 |         cout<<(n)+(n*n)+(n*n*);
      |                              ^
Language: C

#include <bits/stdc++.h>

using namespace std;
#define inf 1000000000
#define unvisited -1
#define visited 1
#define eps 1e-9
#define mp make_pair
#define pb push_back
#define pi acos(-1.0)
#define uint64 unsigned long long
#define FastSlowInput ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define debug if(true)
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> ii;
typedef vector<ii> vii;

int main(){
	int n;
	scanf("%d",&n);
	printf("%d\n",n + n*n + n*n*n);
	
	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 <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1e9;
const ll mod = 1e9 + 7;
const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};

int main() {
  int a;
  cin >> a;
  cout < a + a*a + a*a*a << endl;

  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:13:26: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
   13 |   cout < a + a*a + a*a*a << endl;
      |          ~~~~~~~~~~~~~~~~^~~~~~~
Language: C++

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

#define llt long long int
#define modm 1000000007

int main(){
	int n,m,ans=0;
	string s1,s2;
	cin>>n;
	ans=a+(a*a)+(a*a*a);
	cout<<ans<<endl;
	
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'a' was not declared in this scope
   11 |         ans=a+(a*a)+(a*a*a);
      |             ^
Language: C++

// Sky's the limit :)
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    int T = 1; 
    // cin >> T; 
    while (T--) {
        int n;
        cin >> n;

        int ans = a + a * a + a * a * a;
        cout << ans << '\n';   
        
    }
    
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:15:19: error: 'a' was not declared in this scope
   15 |         int ans = a + a * a + a * a * a;
      |                   ^
Language: C++

include <iostream>
using namespace std;
int main() {
  int a;
  cout << a + a * a + a * a * a << endl;
  return 0;
}


Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cout' was not declared in this scope
    5 |   cout << a + a * a + a * a * a << endl;
      |   ^~~~
a.cc:5:36: error: 'endl' was not declared in this scope
    5 |   cout << a + a * a + a * a * a << endl;
      |                                    ^~~~
Language: C++

//In the name of Allah :)
#include <bits/stdc++.h>
using namespace std;
#define wis(x) "[" << #x << " : " << x << "] " << 
typedef long long ll;

const int MAXN = 2e5 + 10, MOD = 1e9 + 7, INF = 1e9 + 5;

int main()
{
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	int n;
	cin >> n;
	cout << a + a * a + a * a * a << '\n';
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:17: error: 'a' was not declared in this scope
   14 |         cout << a + a * a + a * a * a << '\n';
      |                 ^
Language: C++

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define mp make_pair
#define pb(x) push_back(x)
#define vi vector<int>
#define vs vector<string>
#define vll vector<long long>
#define vc vector<char>
#define vs vector<string>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pil pair<int, long long>
#define pli pair<long long, int>
#define pcc pair<char, char>
#define pdd pair<double, double>
#define mll map<long long, long long>
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
#define flsh fflush(stdout)
#define gcd __gcd
#define clr(x) memset(x, 0, sizeof(x))
#define mod 1000000007LL
#define mod2 998244353LL
#define INF 1000000000007
 

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> o_tree;


void solve()
{
    ll n;
    cin>>n;
    cout<<(a+a*a+a*a*a)<<"\n";
}


int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);


if (fopen("input.txt","r" ))
  {
     freopen("input.txt", "r", stdin);
     freopen("output.txt", "w", stdout);
  }
cout<<setprecision(20);


ll t=1;


// cin>>t;


while(t--)
{
solve();
} 


return 0;
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:40:12: error: 'a' was not declared in this scope
   40 |     cout<<(a+a*a+a*a*a)<<"\n";
      |            ^
Language: C++

 #include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define ll long long int
#define pii pair<int,int>
#define pll pair<long long int,long long int>
#define pci pair<char,int
#define mii map<int,int>
#define mll map<long long int,long long int>
#define mci map<char,int>
#define umii unordered_map<int,int>
#define umll unordered_map<long long int,long long int>
#define umci unordered_map<char,int>
#define F first
#define S second
#define pb push_back
#define endl '\n'
  
using namespace std;
bool sortinrev(const pair<ll,ll> &a,  
               const pair<ll,ll> &b) 
{
       if(a.first!=b.first) return(a.first > b.first);
       else return (a.second<b.second);
} 
ll power(ll x,int n)
{
    ll result=1;
    while(n>0)
    {
        if(n % 2 ==1)
            result=(result * x);
        x=(x*x);
        n=n/2;
    }
    return result;
}

int main(){
    IOS;
 cin>>n;
 cout<<n+n*n+n*n*n; 
return 0;}

Compiler output:
a.cc: In function 'int main()':
a.cc:40:7: error: 'n' was not declared in this scope; did you mean 'yn'?
   40 |  cin>>n;
      |       ^
      |       yn
Language: Java

/*
If you want to aim high, aim high
Don't let that studying and grades consume you
Just live life young
******************************
What do you think? What do you think?
1st on Billboard, what do you think of it
Next is a Grammy, what do you think of it
However you think, I’m sorry, but shit, I have no fcking interest
*******************************
I'm standing on top of my Monopoly board
That means I'm on top of my game and it don't stop
til my hip don't hop anymore
https://www.a2oj.com/Ladder16.html
*******************************
300IQ as writer = Sad!
*/
import java.util.*;
import java.io.*;
import java.math.*;

   public class A
   {
      public static void main(String hi[]) throws Exception
      {
         BufferedReader infile = new BufferedReader(new InputStreamReader(System.in));  
         StringTokenizer st = new StringTokenizer(infile.readLine());
         int N = Integer.parseInt(st.nextToken());
         int res = N+N*N+N*N*N;
         System.out.println(res);
      }
   }

Compiler output:
Main.java:22: error: class A is public, should be declared in a file named A.java
   public class A
          ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
#define REP(i, n) for(ll (i) = 0; (i) < (n); (i)++)
#define REPR(i, n) for(ll (i) = (n); (i) >= 0; (i)--)
#define FOR(i, m, n) for(ll (i) = (m); (i) < (n); (i)++)
#define INF 1e9
#define ALL(v) v.begin(), v.end()
#define _GLIBCXX_DEBUG

template <uint MD> struct ModInt {
    using M = ModInt;
    const static M G;
    uint v;
    ModInt(ll _v = 0) { set_v(uint(_v % MD + MD)); }
    M& set_v(uint _v) {
        v = (_v < MD) ? _v : _v - MD;
        return *this;
    }
    explicit operator bool() const { return v != 0; }
    M operator-() const { return M() - *this; }
    M operator+(const M& r) const { return M().set_v(v + r.v); }
    M operator-(const M& r) const { return M().set_v(v + MD - r.v); }
    M operator*(const M& r) const { return M().set_v(uint(ull(v) * r.v % MD)); }
    M operator/(const M& r) const { return *this * r.inv(); }
    M& operator+=(const M& r) { return *this = *this + r; }
    M& operator-=(const M& r) { return *this = *this - r; }
    M& operator*=(const M& r) { return *this = *this * r; }
    M& operator/=(const M& r) { return *this = *this / r; }
    bool operator==(const M& r) const { return v == r.v; }
    M pow(ll n) const {
        M x = *this, r = 1;
        while (n) {
            if (n & 1) r *= x;
            x *= x;
            n >>= 1;
        }
        return r;
    }
    M inv() const { return pow(MD - 2); }
    friend ostream& operator<<(ostream& os, const M& r) { return os << r.v; }
};
using Mint = ModInt<1000000007>;

const double PI = 3.14159265358979323846;

bool compare_by_b(pair<int, int> a, pair<int, int> b) {
    if(a.second != b.second){
        return a.second < b.second;
    }else{
        return a.first < b.first;
    }
}

ll gcd(ll a, ll b) {
    return b != 0 ? gcd(b, a % b) : a;
}

ll lcm(ll a, ll b) {
    return (a * b) / gcd(a, b);
}

int main()
{	
    cin >> a;
    cout << a+a*a+a*a*a << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:67:12: error: 'a' was not declared in this scope
   67 |     cin >> a;
      |            ^
Language: C

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define st first
#define nd second
#define INF 1000000007LL
using namespace std;

int main(){
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  ll a;
  cin >> a;
  cout << a + a * a + a * a * a << '\n';  
}

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<bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
 
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("-ffloat-store")
 
#define int  long long
#define rep(i,begin,end) for(__typeof(end)i=(begin)-((begin)>(end));i!=(end)-((begin)>(end));i+=1-2*((begin)>(end)))
#define F first
#define S second
#define sz(x) ((int)x.size())
#define pb push_back
#define pf push_front
#define eb emplace_back
#define all(v) (v).begin(), (v).end()
#define mod 1000000007
#define what_is(x) cerr << #x << " is " << x <<"\n";
#define sortA(v) sort(v.begin(), v.end())
#define sortD(v) sort(v.rbegin(), v.rend())
#define PI 3.14159265358979323846
#define vout(a) for(auto x:a) cout<<x<<" ";
#define INF 10000000000000000 //1e16
 
// #define ordered_set tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update>
 
 
// using namespace __gnu_pbds;
using namespace std;
 
using ll  = long long;
using vi  = vector<int>;
using pii = pair<int,int>;
using vii = vector<pii>;
using mi  = multiset<int>;
using mii = multiset<pii>;
 
int lcm(int a,int b) {return (a*(b/__gcd(a,b)));}



void solve()
{
    int t,n,m,i,k,r,l,u,v,w,j,s,sum=0,pos,flag=0,count=0;
    string S,T,U; 
    // int a,b,c;
    cin>>n;
  cout<<a+a*a+a*a*a;
}
 
 
signed main()
{
    #ifndef ONLINE_JUDGE 
       freopen("input.txt","r",stdin);
       freopen("output.txt","w",stdout);
    #endif
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--)
    {
        solve();
        if(t)cout<<"\n";
    }
    return 0;
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:49:9: error: 'a' was not declared in this scope
   49 |   cout<<a+a*a+a*a*a;
      |         ^
Language: C++

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


int main(){
    int i;
    cin >> i;
    cout << a+ a*a+a*a*a << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: 'a' was not declared in this scope
   10 |     cout << a+ a*a+a*a*a << endl;
      |             ^
Language: C++

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

#define f first
#define s second
#define ins insert
#define pb push_back
#define endl '\n'
#define ll long long
#define ld long double
#define vi vector<int>
#define vl vector<ll>
#define ii pair<int,int>
#define no cout << "NO" << endl
#define yes cout << "YES" << endl
#define sz(c) (int) (c).size()
#define trav(x,c) for(auto &(x) : (c))
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define _for(i,a,n) for(int (i) = (a) ; (i) < (n); ++(i))
#define _rfor(i,a,n) for(int (i) = (n)-1 ; (i) >= (a); --(i))
#define db(x) cout << (#x) << ": " << (x) << endl;
#define _db(c) trav(x,c) cout << (x) << " "; cout << endl;
#define godspeed ios_base::sync_with_stdio(false); cin.tie(0);
#define tc int t; cin >> (t); while ((t)--)

int main() {
	godspeed;
	int n; cin >> n;
	cout << a + a*a + a*a*a;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:17: error: 'a' was not declared in this scope
   30 |         cout << a + a*a + a*a*a;
      |                 ^
Language: C++

#include <iostream>
#include <string>

int main() {
  int res = 0;
  string a, b;
  cin >> a >> b;
  for (int i = 0; i < a.length(); ++i) 
    res += (a[i] != b[i]);
  cout << res << '\n';
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string a, b;
      |   ^~~~~~
a.cc:6:3: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   cin >> a >> b;
      |   ^~~
      |   std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:10: error: 'a' was not declared in this scope
    7 |   cin >> a >> b;
      |          ^
a.cc:7:15: error: 'b' was not declared in this scope
    7 |   cin >> a >> b;
      |               ^
a.cc:10:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |   cout << res << '\n';
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

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

int main() {
    string s, t;
    cin >> s >> t;
    int ans = 0;
    for (int i = 0; i < (int)s.size(); i++) {
        if (s[i] != t[i]) ans++;
    }
    cout << ans << endl;
    return 0;
}

Compiler output:
main.c:1:11: fatal error: iostream: No such file or directory
    1 | # include <iostream>
      |           ^~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
#define rep(i,n) for(int i=0; i< (n); i++)
using namespace std;
typedef long long ll;
const int mod = 1000000007;

int main(){
	char s[20010]={};
	char t[20010]={};#include<bits/stdc++.h>
#define rep(i,n) for(int i=0; i< (n); i++)
using namespace std;
typedef long long ll;
const int mod = 1000000007;

int main(){
	char s[2*100000+1]={};
	char t[2*100000+1]={};
	cin>>s>>t;
	int p=strlen(s);
	int ans=0;
	rep(i,p){
		if(s[i]!=t[i]){
			ans++;
		}
	}
	cout<<ans<<endl;
}
	cin>>s>>t;
	int p=strlen(s);
	int ans=0;
	rep(i,p){
		if(s[i]!=t[i]){
			ans++;
		}
	}
	cout<<ans<<endl;
}

Compiler output:
a.cc:9:26: error: stray '#' in program
    9 |         char t[20010]={};#include<bits/stdc++.h>
      |                          ^
a.cc: In function 'int main()':
a.cc:9:27: error: 'include' was not declared in this scope
    9 |         char t[20010]={};#include<bits/stdc++.h>
      |                           ^~~~~~~
a.cc:9:35: error: 'bits' was not declared in this scope
    9 |         char t[20010]={};#include<bits/stdc++.h>
      |                                   ^~~~
a.cc:9:40: error: 'stdc' was not declared in this scope; did you mean 'std'?
    9 |         char t[20010]={};#include<bits/stdc++.h>
      |                                        ^~~~
      |                                        std
a.cc:11:1: error: expected primary-expression before 'using'
   11 | using namespace std;
      | ^~~~~
a.cc:15:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   15 | int main(){
      |         ^~
a.cc:15:9: note: remove parentheses to default-initialize a variable
   15 | int main(){
      |         ^~
      |         --
a.cc:15:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:15:11: error: a function-definition is not allowed here before '{' token
   15 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define rep(i,n) for(ll i=0;i<(n);i++)
#define init(a,i) for(int k=0;k<(i);k++)(a)[k]=0
#define in(a,i) for(int k=0;k<(i);k++)cin>>(a)[k]
#define all(a)  (a).begin(),(a).end()
#define el(a) (a).end()-(a).begin()
#define mod 1000000007
#define inf 2147483647
#define range(x,a,b) (a)<=x&&x<=(b)
int main(){
	string a,t;
	int count=0;
	cin>>s>>t;
	rep(i,s.size()){
		if(s[i]==t[i])count++;
	}
	cout<<s.size()-count;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:14: error: 's' was not declared in this scope
   16 |         cin>>s>>t;
      |              ^
Language: C++

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

int main(){
  string S,T;
  cin >> S >> T;
  int count=0;
  for(int i=0;i<S.size();i++){
    if(S.at(i)!=T.at(i)){
      count+;
    }
  }
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: expected primary-expression before ';' token
   10 |       count+;
      |             ^
Language: C

#include <iostream>
using namespace std;
int main() {
    string S,T;
    int N,syutsuryoku;
    cin >> S;
    cin >> T;
    N = S.size();
    for (int i=0;i<(N-1);i++) {
    if (S.at(i) != T.at(i)) {
        syutsuryoku++;
    }
    }
    if (syutsuryoku != 0) cout << syutsuryoku+1 << endl;
    else cout << syutsuryoku << endl;
    
}


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

{
    string S,T;
    int N,syutsuryoku;
    cin >> S;
    cin >> T;
    N = S.size();
    for (int i=1;i<N;i++) {
    if (S.at(i) != T.at(i)) {
        syutsuryoku++;
    }
    }
    cout << syutsuryoku << endl;
    // Your code here!
    
}


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

#include<iostream>
#include<cstring>

using namespace std;

int main()
{
  string S,T;

  cin >> S >> T ;

  int len=strlen(S);

  int ans=0;
  for(int i=0;i<len;i++)
    if(S[i]!=T[i])
      ans++;

  cout << ans;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:12:18: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
   12 |   int len=strlen(S);
      |                  ^
      |                  |
      |                  std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/cstring:43,
                 from a.cc:2:
/usr/include/string.h:407:35: note:   initializing argument 1 of 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main()
{
  string S,T;

  cin >> S >> T ;

  int len=strlen(S);

  int ans=0;
  for(int i=0;i<len;i++)
    if(S[i]!=T[i])
      ans++;

  cout << ans;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: 'strlen' was not declared in this scope
   12 |   int len=strlen(S);
      |           ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>
Language: C++

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

int main() {
    int S,T; cin >> S >> T;
    int ans=0;
    for(int i=0; i<S.size(); i++){
        if(S.at(i)!=T.at(i)) ans++;
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: request for member 'size' in 'S', which is of non-class type 'int'
    7 |     for(int i=0; i<S.size(); i++){
      |                      ^~~~
a.cc:8:14: error: request for member 'at' in 'S', which is of non-class type 'int'
    8 |         if(S.at(i)!=T.at(i)) ans++;
      |              ^~
a.cc:8:23: error: request for member 'at' in 'T', which is of non-class type 'int'
    8 |         if(S.at(i)!=T.at(i)) ans++;
      |                       ^~
Language: C++

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

int main(){
  string s,t;
  cin >> s >> t;
  int count = 0;
  for(i=0;i<s.length();i++){
    if(s.at(i) != t.at(i)){
      count++;
    }
  }
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:7: error: 'i' was not declared in this scope
    9 |   for(i=0;i<s.length();i++){
      |       ^
Language: C++

#include <iostream>

using namespace std;

int main(){
  string S, T;
  int count=0;
  cin >> S >> T;
  int size = S.size();
  for(int x=0;x<size;x++){
    if(S.at(x)==T.size(x)){
      count++;
    }
  }
  cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:23: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int&)'
   11 |     if(S.at(x)==T.size(x)){
      |                 ~~~~~~^~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1076:7: note: candidate: '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]'
 1076 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note:   candidate expects 0 arguments, 1 provided
Language: C++

#include <iostream>

using namespace std;

int main(){
  string S, T;
  int count=0;
  cin >> S >> T;
  int size = S.size();
  for(int x=0;x<size;x++;){
    if(S.at(x)==T.size(x)){
      count++;
    }
  }
  cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:25: error: expected ')' before ';' token
   10 |   for(int x=0;x<size;x++;){
      |      ~                  ^
      |                         )
a.cc:10:26: error: expected primary-expression before ')' token
   10 |   for(int x=0;x<size;x++;){
      |                          ^
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
using namespace std;
const long long INF = 1LL << 60;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int main(){
    string S, T;
    cin >> S >> T;
    int ans = 0;
    rep(i, S.size()){
        if(S.at(i) != T.at(i)) ans++;s
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:38: error: 's' was not declared in this scope
   13 |         if(S.at(i) != T.at(i)) ans++;s
      |                                      ^
Language: C++

#includ<bits/stdc++.h>
using namespce std;
int main(){
  
  int cnt = 0;
  string a,b;cin>>a>>b;
  for(int i=0;i<a.size();i++){
    if(a[i]!=b[i]) cnt++;
  }
  cout<<cnt<<endl;
  return 0;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #includ; did you mean #include?
    1 | #includ<bits/stdc++.h>
      |  ^~~~~~
      |  include
a.cc:2:7: error: expected nested-name-specifier before 'namespce'
    2 | using namespce std;
      |       ^~~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string a,b;cin>>a>>b;
      |   ^~~~~~
a.cc:6:14: error: 'cin' was not declared in this scope
    6 |   string a,b;cin>>a>>b;
      |              ^~~
a.cc:6:19: error: 'a' was not declared in this scope
    6 |   string a,b;cin>>a>>b;
      |                   ^
a.cc:6:22: error: 'b' was not declared in this scope
    6 |   string a,b;cin>>a>>b;
      |                      ^
a.cc:10:3: error: 'cout' was not declared in this scope
   10 |   cout<<cnt<<endl;
      |   ^~~~
a.cc:10:14: error: 'endl' was not declared in this scope
   10 |   cout<<cnt<<endl;
      |              ^~~~
Language: C++

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

int main(){
  string S,T;
  cin >> S >> T;
  int count=0;
  for(int i=0;i<N;i++){
    if(S.at(i)!=T.at(i)){
      count++;
    }
  }
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: 'N' was not declared in this scope
    8 |   for(int i=0;i<N;i++){
      |                 ^
Language: C

#include <stdio.h>
int main(){
	char s[200001];
    char t[200001];
  	int count=0;
  	scanf("%s",s);
  	scanf("%s",t);
  	for(int i=0;s[i];i++){
    	if(s[i]!=t[i]) count++:
    }
  	printf("%d\n",count);
}

Compiler output:
main.c: In function 'main':
main.c:9:31: error: expected ';' before ':' token
    9 |         if(s[i]!=t[i]) count++:
      |                               ^
      |                               ;
Language: C++

#include <iostream>
#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int mod  = 1e9 + 7;
const ll INF = 1e14;

void solve(){

    string s1, s2;
    cin >> s1 >> s2;
    int count = 0;
    for(int i = 0; i < s1.length(); ++i){
        if(s1[i] == s2[1]) ++count;
    }

    cout << ((int)s.length()-count);

}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    //int test; cin >> test;
    //for(int t = 1; t <= test; ++t){
        solve();    
    //}

	return 0;
}



Compiler output:
a.cc: In function 'void solve()':
a.cc:20:19: error: 's' was not declared in this scope; did you mean 's2'?
   20 |     cout << ((int)s.length()-count);
      |                   ^
      |                   s2
Language: C++

#include <iostream>
using namespace std;

int main() {
string s,t;ؤin>>s>>t;int counter=0;
for(int i = 0 ; i < s.size();i++){
        if(s[i] != t[i]){
            counter++;
        }
    
}cout<<counter<<endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:12: error: '\U00000624in' was not declared in this scope
    5 | string s,t;ؤin>>s>>t;int counter=0;
      |            ^~~
Language: Java

public class Main {
  public static void main(String[] args) {
    String S = new java.util.Scanner(System.in).nextLine();
    String T = new java.util.Scanner(System.in).nextLine();
    int num = S.length;
    int counts = 0;
    for (int i = 0; i < num; i++) {
      if (S.charAt(i) != T.charAt(i)) {
        counts = counts + 1;
      }
    }
    System.out.println(counts);
  }
}


Compiler output:
Main.java:5: error: cannot find symbol
    int num = S.length;
               ^
  symbol:   variable length
  location: variable S of type String
1 error
Language: Java

public class Main {
  public static void main(String[] args) {
    String S = new java.util.Scanner(System.in).nextLine();
    String T = new java.util.Scanner(System.in).nextLine();
    int counts = 0;
    for (int i = 0; i < S.length; i++) {
      if (S.charAt(i) != T.charAt(i)) {
        counts = counts + 1;
      }
    }
    System.out.println(counts);
  }
}


Compiler output:
Main.java:6: error: cannot find symbol
    for (int i = 0; i < S.length; i++) {
                         ^
  symbol:   variable length
  location: variable S of type String
1 error
Language: Java

public class Main {
  public static void main(String[] args) {
    String S = new java.util.Scanner(System.in).nextLine();
    String T = new java.util.Scanner(System.in).nextLine();
    counts = 0;
    for (int i = 0; i < S.length; i++) {
      if (S.charAt(i) == T.charAt(i)) {
        counts = counts + 1;
      }
    }
    System.out.println(counts);
  }
}

Compiler output:
Main.java:5: error: cannot find symbol
    counts = 0;
    ^
  symbol:   variable counts
  location: class Main
Main.java:6: error: cannot find symbol
    for (int i = 0; i < S.length; i++) {
                         ^
  symbol:   variable length
  location: variable S of type String
Main.java:8: error: cannot find symbol
        counts = counts + 1;
        ^
  symbol:   variable counts
  location: class Main
Main.java:8: error: cannot find symbol
        counts = counts + 1;
                 ^
  symbol:   variable counts
  location: class Main
Main.java:11: error: cannot find symbol
    System.out.println(counts);
                       ^
  symbol:   variable counts
  location: class Main
5 errors
Language: Java

import java.util.*;
public class Berg {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int counter =0;

        String w1 = input.next();
        String w2 = input.next();

        char[] first  = w1.toLowerCase().toCharArray();
        char[] second = w2.toLowerCase().toCharArray();


        int minLength = Math.min(first.length, second.length);

        for(int i = 0; i < minLength; i++)
        {
            if (first[i] != second[i])
            {
                counter++;
            }
        }
        System.out.println(counter);

    }
}






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

#include<bits/stdc++.h>
#define pi acos(-1)
#define ll long long
#define pii pair<ll,ll>
#define debug(a) cout<<a<<'\n'
#define maxn 100009 /// I wanna be the wind
#define MOD 1000000007
#define F first
#define S second
#define rep(i, a, b) for(ll i = a; i < (b); ++i)
#define per(i, b, a) for(ll i = b-1; i>=a ; i--)
#define trav(a, x) for(auto& a : x)
#define allin(a , x) for(auto a : x)
#define all(x) begin(x), end(x)
#define sz(x) (ll)(x).size()
using namespace std;
const ll INF = 1e17 + 9;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    string a,b;
    cin>>a>>b;
    ll ans=0;
    rep(i,0,n){
        if(a[i]!=b[i])ans++;
    }
    cout<<ans<<"\n";
    return 0;  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:13: error: 'n' was not declared in this scope
   24 |     rep(i,0,n){
      |             ^
a.cc:10:41: note: in definition of macro 'rep'
   10 | #define rep(i, a, b) for(ll i = a; i < (b); ++i)
      |                                         ^
Language: C++

/* Author: Rennan Rocha
 * Time: $%Y%$-$%M%$-$%D%$ $%h%$:$%m%$:$%s%$
**/

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define F first
#define S second
#define PB push_back
#define MP make_pair

#define ll long long
#define vi vector<int>
#define vll vector<ll>
#define pi pair<int,int>
#define pll pair<ll, ll>
#define vpi vector<pi>
#define vpll vector<pll>

#define INF 1e18
#define MOD 1000000007
//#define DEBUG

using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
//*find_by_order(); order_of_key();

unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
std::default_random_engine e(seed);
std::mt19937 rng((int) seed);

void solvetask() {
    string s, t;
    cin >> s >> t;
    int ans = 0;
    for(int i = 0; i < s.size(); i++) if(s[i] != s[t]) ans++;
    cout << ans << endl;

}

int main() {
    ios_base::sync_with_stdio(false);

    int t = 1;

    while(t--) solvetask();
}


Compiler output:
a.cc: In function 'void solvetask()':
a.cc:40:51: error: no match for 'operator[]' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   40 |     for(int i = 0; i < s.size(); i++) if(s[i] != s[t]) ans++;
      |                                                   ^
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:5:
/usr/include/c++/14/bits/basic_string.h:1247:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[](size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; const_reference = const char&; size_type = long unsigned int]'
 1247 |       operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:1247:29: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'}
 1247 |       operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT
      |                   ~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:1265:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[](size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; reference = char&; size_type = long unsigned int]'
 1265 |       operator[](size_type __pos)
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:1265:28: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'}
 1265 |       operator[](size_type __pos)
      |                  ~~~~~~~~~~^~~~~
Language: C++

#include<bits/stdc++.h>
#define pi acos(-1)
#define ll long long
#define pii pair<ll,ll>
#define debug(a) cout<<a<<'\n'
#define maxn 100009 /// I wanna be the wind
#define MOD 1000000007
#define F first
#define S second
#define rep(i, a, b) for(ll i = a; i < (b); ++i)
#define per(i, b, a) for(ll i = b-1; i>=a ; i--)
#define trav(a, x) for(auto& a : x)
#define allin(a , x) for(auto a : x)
#define all(x) begin(x), end(x)
#define sz(x) (ll)(x).size()
using namespace std;
const ll INF = 1e17 + 9;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    string a,b;
    cin>>a>>b;
    ll ans=0;
    rep(i,0,n){
        if(a[i]!=b[i])ans++;
    }
    cout<ans<<"\n";
    return 0;  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:13: error: 'n' was not declared in this scope
   24 |     rep(i,0,n){
      |             ^
a.cc:10:41: note: in definition of macro 'rep'
   10 | #define rep(i, a, b) for(ll i = a; i < (b); ++i)
      |                                         ^
a.cc:27:13: error: invalid operands of types 'long long int' and 'const char [2]' to binary 'operator<<'
   27 |     cout<ans<<"\n";
      |          ~~~^~~~~~
      |          |    |
      |          |    const char [2]
      |          long long int
Language: C

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

#define mxz 2e5+10

char a[(int)mxz], b[(int)mxz];

int main(void) {
	int d = 0;

	scanf("%s", a);
	scanf("%s", b);

	if(strcmp(a, b) != 0){
		for(int c = 0; c < strlen(a); c++){
			if(a[c] != b[c]){
				a[c] = b[c];
				d++;
			}
		}
		printf("%d\n", d);
	}
	else{
		printf("0");
	}

	return 0;

Compiler output:
main.c: In function 'main':
main.c:27:9: error: expected declaration or statement at end of input
   27 |         return 0;
      |         ^~~~~~
Language: C++

S = list(input())
T = list(input())
 
l = len(S)
count = 0
for i in range(l):
    if S[i] != T[i]:
        count += 1
 
print(count)

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