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

int main(){
    int64_t h,w;
    cin>>h>>w;
    if(h*w%2==0)cout<<h*w/2;
    else cout<<h*w/2+1;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:5: error: 'int64_t' was not declared in this scope
    2 |     int64_t h,w;
      |     ^~~~~~~
a.cc:1:1: note: 'int64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
  +++ |+#include <cstdint>
    1 | int main(){
a.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin>>h>>w;
      |     ^~~
a.cc:3:10: error: 'h' was not declared in this scope
    3 |     cin>>h>>w;
      |          ^
a.cc:3:13: error: 'w' was not declared in this scope
    3 |     cin>>h>>w;
      |             ^
a.cc:4:17: error: 'cout' was not declared in this scope
    4 |     if(h*w%2==0)cout<<h*w/2;
      |                 ^~~~
a.cc:5:10: error: 'cout' was not declared in this scope
    5 |     else cout<<h*w/2+1;
      |          ^~~~
Language: C++

#include <stdio.h>
#include <iostream>

#include <bits/stdc++.h>


using namespace std;

#define INPUT_INT(valName) int valName; cin >> valName
#define INPUT_LLINT(valName) long long int valName; cin >> valName;
#define INPUT_STR(valName) string valName; cin >> valName;
#define INPUT_LINE(valName) string valName; getline(cin,s);
#define INPUT_VECTOR_INT(valName, N) vector<int> valName(N); for(int i=0; i < N; ++i) { cin >> valName[i]; }
#define INPUT_VECTOR_DOUBLE(valName, N) vector<double> valName(N); for(int i=0; i < N; ++i) { cin >> valName[i]; }

#define OUTPUT(A) cout << (A) << endl;
#define OUTPUT2(A, B) cout << (A) << " " << (B) << endl;
#define OUTPUT3(A, B, C) cout << (A) << " " << (B) << " " << (C) << endl;

#define REP(valName, N) for(int valName = 0; valName < N; ++valName)

vector<string> split(const string& str, char delimiter) {
	vector<string> ret;
	string tmp = "";
	for (auto c : str) {
		if (c != delimiter) {
			tmp.push_back(c);
		} else {
			ret.push_back(tmp);
			tmp = "";
		}
	}
	ret.push_back(tmp);
	return ret;
}

template <typename T> void sortAsc(vector<T>& v) { sort(v.begin(), v.end(), less<T>()); }
template <typename T> void sortDesc(vector<T>& v) { sort(v.begin(), v.end(), greater<T>()); }

template <typename T> void insert(vector<T>& dest, const vector<T>& src) { copy(src.begin(), src.end(), back_inserter(dest)); }

template <long long int MOD> long long int mod_inv(long long int a) {
	long long b = MOD, u = 1, v = 0;
	while (b) {
		long long int t = a / b;
		a -= t * b; swap(a, b);
		u -= t * v; swap(u, v);
	}
	u %= MOD;
	if (u < 0) u += MOD;
	return u;
}

template <long long int MOD> long long int mod_add(long long int a, long long int b) {
	return (a + b) % MOD;
}

template <long long int MOD> long long int mod_sum(long long int a, long long int b) {
	return (a - b) % MOD;
}

template <long long int MOD> long long int mod_mul(long long int a, long long int b) {
	return (a % MOD) * (b % MOD) % MOD;
}

template <long long int MOD> long long int mod_mul(long long int a, long long int b, long long int c) {
	return mod_mul<MOD>(a, mod_mul<MOD>(b, c));
}

template <long long int MOD> long long int mod_div(long long int a, long long int b) {
	return (a % MOD) * mod_inv<MOD>(b) % MOD;
}

int sign(long long int a) {
	return a >= 0 ? 1 : -1;
}


//------------------------------------------------------------------------------------------------------------------------------



int main() {

	// TODO: streamやめる

	cin.tie(0); ios::sync_with_stdio(false);

	unsigned long long int H; cin >> H;
	unsigned long long int W; cin >> W;

	if (H == 1 || W == 1) {
		OUTPUT(0);
		return;
	}

	unsigned long long int result = 0;
	for (unsigned long long int x = 1; x <= W; ++x) {
		if (x % 2 == 1) {
			result += (H+1)/2;
		} else {
			result += H/2;
		}
	}

	OUTPUT(result);

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:94:17: error: return-statement with no value, in function returning 'int' [-fpermissive]
   94 |                 return;
      |                 ^~~~~~
Language: Java

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        long h = scan.nextLong()
        long w = scan.nextLong();


        if (w % 2 == 0) {
            System.out.println((w / 2) * h);
        } else {
            if (h % 2 == 0) {
                System.out.println(w * (h / 2));
            } else {
                System.out.println((w * h + 1) / 2);
            }
        }
    }
}


Compiler output:
Main.java:9: error: ';' expected
        long h = scan.nextLong()
                                ^
1 error
Language: C++

#pragma comment(linker,"/stack:16777216")
#include<iostream>
#include<cstdio>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<list>
#include<stack>
#include<queue>
#include<deque>
#include<functional>
#include<utility>
#include<algorithm>
#include<sstream>
#include<cstring>
#include<cmath>
#include<cctype>
#include<exception>
#include<climits>
#include<cfloat>
#include<iomanip>
#include<bitset>
#include<streambuf>
#include<cstdlib>
#include<ctime>
//#include"functions.h"
//#include"highprecision.h"
#define pb push_back
#define pf push_front
#define ppb pop_back
#define mp make_pair
#define np next_permutation
#define fi first
#define sc second
#define vi vector<int>
#define vll vector<long long>
#define vvi vector<vector<int> >
#define vpi vector<pair<int,int> >
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pff pair<float,float>
#define pdd pair<double,double>
#define psi pair<string,int>
#define pis pair<int,string>
#define ppi pair<pii,int>
#define pdi pair<pii,pii>
#define LN 84757
#define INF 1e9
#define LLINF 1e18
#define MAXINT 0x7fffffff
#define MAXLL 0x7fffffffffffffff
#define EPS 1e-5
#define DEPS 1e-9
#define LDEPS 1e-13
#define MOD 1000000007
#define E 2.7182818284
#define PI 3.1415926535
#define rep(a,b) for(int a=0;a<b;a++)
#define rep(a,b) for(int a=0;a<b;a++)
#define forn(a,n) for(int a=1;a<=n;a++)
#define forr(a,n) for(int a=n;a>=1;a--)
#define repn(a,n,p) for(int a=0;a<n;a+=p)
#define repr(a,n) for(int a=n-1;a>=0;a--)
#define foreach(a,b) for(__typeof(b.begin())a=b.begin();a!=b.end();a++)
#define fillemp(a) memset(a,0,sizeof(a))
#define fillinf(a) memset(a,0x3f,sizeof(a))
#define frestream freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
#define stdf(a,b) freopen(a,"r",stdin);freopen(b,"w",stdout);
#define inputf(a) freopen(a,"r",stdin);
#define outputf(a) freopen(a,"w",stdout);
#define sz(a) a.size()
#define all(a) a.begin(),a.end()
#define MOD 1000000007
typedef long long ll;
typedef long double ld;
using namespace std;

int main(int argc,char** argv){
	ll n,m;
	cin>>n>>m;
	if(n==1||m==1)cout<<1;
	else scout<<(n*m+1ll)/2ll;
	return 0;
}

Compiler output:
a.cc: In function 'int main(int, char**)':
a.cc:83:14: error: 'scout' was not declared in this scope; did you mean 'stdout'?
   83 |         else scout<<(n*m+1ll)/2ll;
      |              ^~~~~
      |              stdout
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define INS(x) x.begin(),x.end()
    

    
int main()
{
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    long long h,w;
    cin>>h>>w;

    if (h==1||w==1) {cout<<1<<'\n'; break;}
    long long a=ceil(1.0*w/2),b;
    if (w%2) b=a-1;
    else b=a;

    long long base=h/2;
    if (h%2) cout<<base*(a+b)+a;
    else cout<<base*(a+b);
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:37: error: break statement not within loop or switch
   13 |     if (h==1||w==1) {cout<<1<<'\n'; break;}
      |                                     ^~~~~
Language: C++

#include <cstido>
using namespace std;

int main(){
	int a, b, n;
  
  	scanf("%d%d", &a, &b);
  	if(a%2 != 0 && b%2!=0){
    	n = (a*b)/2 +1;
    }
  	else{
    	n = (a*b)/2;
    }
  	printf("%d", n);
 	

}

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

#include <iostream>

using namespace std;

int main()
{
    unsigned long long H, W;

    cin >> H >> W;

    if (H == 1 || W == 1)
    {
        cout << 1 << endl;
        return;
    }

    unsigned long long ans = H * W % 2 == 0 ? H * W / 2 : H * W / 2 + 1;

    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
   14 |         return;
      |         ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i,N) for(int i = 0;i < (int)(N);i++)
int main(){
  int h,k;
  cin>>h>>k;
  int a=(k+1)/2;
  if(k%2==0){
     cout<<a*h<<endl;
}
   if(k%2==1){
     cout<<a*h+h/2+1<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:2: error: expected '}' at end of input
   14 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int H, W;
  cin >> H >> W;
 
  if (H*W%2==0) {
    cout << H*W/2 << endl;
  }
 
  else if (H*W%2==1) {
    cout << H*W/2+1 << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:2: error: expected '}' at end of input
   15 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
 int H,W;
  cin >> H >> W;
  int seki;
  seki= H*W;
    if(seki%2==0){
      cout << answer/2 << endl;
  }
  if(seki%2==1){
      cout << (answer/2)+1 << endl;
  }  
}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: 'answer' was not declared in this scope
   10 |       cout << answer/2 << endl;
      |               ^~~~~~
a.cc:13:16: error: 'answer' was not declared in this scope
   13 |       cout << (answer/2)+1 << endl;
      |                ^~~~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
#include <utility>
#include <map>
#include <string>
#include <math.h>
using namespace std;


int main() {

    int i=0;
    unsined long long int H,W;
    cin >> H >> W;
    
    if((H*W)%2==0){
        cout << H*W/2 << endl;
    }else{
        cout << H*(W/2)+1 << endl;
    }
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: 'unsined' was not declared in this scope; did you mean 'unsigned'?
   16 |     unsined long long int H,W;
      |     ^~~~~~~
      |     unsigned
a.cc:17:12: error: 'H' was not declared in this scope
   17 |     cin >> H >> W;
      |            ^
a.cc:17:17: error: 'W' was not declared in this scope
   17 |     cin >> H >> W;
      |                 ^
Language: C++

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

int main(int argc, const char * argv[]) {
    LL n, m; cin >> n >> m;
    LL pr = n*m;
    if (pr % 2) cout << pr/2+1 << endl;;
    else cout << pr/2 << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:9:5: error: 'else' without a previous 'if'
    9 |     else cout << pr/2 << endl;
      |     ^~~~
Language: C++

#include <iostream>

int main(void) {
	long long int H, W、sum;
	std::cin >> H >> W;
  	sum = H * W / 2;
  	if (H % 2 != 0 && W % 2 != 0) sum += 1;
	std::cout << sum;
	return 0;
}

Compiler output:
a.cc:4:26: error: extended character 、 is not valid in an identifier
    4 |         long long int H, W、sum;
      |                          ^
a.cc: In function 'int main()':
a.cc:5:26: error: 'W' was not declared in this scope
    5 |         std::cin >> H >> W;
      |                          ^
a.cc:6:9: error: 'sum' was not declared in this scope
    6 |         sum = H * W / 2;
      |         ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main(){
  long long H, W;
  cin >> H >> W;
 

  if (H == 1 || W == 1){
    cout << 1 << endl;
    return o;
  }


  if (H * W % 2 == 1){
    cout << (H * W + 1) / 2 << endl;
  } else {
    cout << H * W /2 << endl;
  }

}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: 'o' was not declared in this scope
   11 |     return o;
      |            ^
Language: C++

/*
   Creator - Glitched
   Yeet!!
*/
#include "bits/stdc++.h"

using namespace std;

#define testcases ll T;cin>>T;while(T--)
#define ll long long
#define loop(i,x,n) for(ll i=x;i<n;i++)
#define loopr(i,x,n) for(ll i=n-1;i>=x;i--)
#define ff first
#define ss second
#define pb push_back
#define elif else if
#define flush cout<<"\n"
#define mod 1E9+7
#define L LONG_MAX
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
const string yes = "Yes", no = "No";



int main()
{   
    double x,y;
    cin>>x>>y;

    cout<<LONG_MAX(ceil((x*y)/2));

} 

Compiler output:
a.cc: In function 'int main()':
a.cc:30:19: error: expression cannot be used as a function
   30 |     cout<<LONG_MAX(ceil((x*y)/2));
      |                   ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define str string
#define all(x) (x).begin(),(x).end()
#define rep(x,b,c) for(int x=b;x<c;x++)
#define  pb(x) push_back(x)
#define long(x) x.size()
int main(){
    ll n,m;
	cin>>n>>m;
	long double ans=n*m;
	if(ans%2!=0) ans++;
	cout<<ans/2<<endl; 
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:15: error: invalid operands of types 'long double' and 'int' to binary 'operator%'
   13 |         if(ans%2!=0) ans++;
      |            ~~~^~
      |            |   |
      |            |   int
      |            long double
Language: C++

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

int main() {
long long h,w;
cin >> h >> w;
long long ans=0;
long long odd_one=(h+1)/2;
long long even_one=h-odd_one;
long long odd_two=(w+1)/2;
long long even_two=w-odd_two;
ans = (odd_one*odd_two+even_one*even_two)
cout << ans;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:42: error: expected ';' before 'cout'
   12 | ans = (odd_one*odd_two+even_one*even_two)
      |                                          ^
      |                                          ;
   13 | cout << ans;
      | ~~~~
Language: C++

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

int H, W;

int main()
{
  cin >> H >> W;
  int x = 0;
  int y = 0;

  int count = 0;
  for (int i = 0; i < H; i++)
  {
    for (int j = 0; j < W; j++)
    {
      if (x + y = i + j || x - y = i - j)
      {
        x = i;
        y = j;
        count++;
      }
    }
  }
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:25: error: lvalue required as left operand of assignment
   18 |       if (x + y = i + j || x - y = i - j)
      |                   ~~~~~~^~~~~~~~
Language: C

#include<stdio.h>
int main(){
  int H,W,a=0,b=0,result;
  scanf("%d %d",&H,&W);
  int a[H][W];
  for(int i=0;i<H;i++){
	for(int j=0;j<M;j++){
    if(i%/2==0&&j%2!=0){
      a++;
    }
    if(i%2!=0&&j%2==0)
      b++;
    }  
  }
  result=a+b;
  printf("%d",result);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:7: error: conflicting types for 'a'; have 'int[H][W]'
    5 |   int a[H][W];
      |       ^
main.c:3:11: note: previous definition of 'a' with type 'int'
    3 |   int H,W,a=0,b=0,result;
      |           ^
main.c:7:23: error: 'M' undeclared (first use in this function)
    7 |         for(int j=0;j<M;j++){
      |                       ^
main.c:7:23: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:10: error: expected expression before '/' token
    8 |     if(i%/2==0&&j%2!=0){
      |          ^
Language: Java

import java.util.*;
import java.math.*;
         
class Main{
    public static void main(String[] args) {
        
        try(Scanner sc = new Scanner(System.in)){
 
            Long height = sc.nextLong();
            Long width = sc.nextLong();

            BigInteger ans = new BigInteger("0");

            if(height % 2 == 0 || width % 2 == 0){
                ans = height * width / 2;
            }else{
                ans = (height * width + 1) / 2;
            }

            System.out.println(ans);
 
        }catch(Exception e){
            e.printStackTrace();
        }        
    }
}

Compiler output:
Main.java:15: error: incompatible types: long cannot be converted to BigInteger
                ans = height * width / 2;
                                     ^
Main.java:17: error: incompatible types: long cannot be converted to BigInteger
                ans = (height * width + 1) / 2;
                                           ^
2 errors
Language: C++

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

int main() {
    int a, b;
    cin >> a >> b;
    int c = a * b;
    if (c % 2 == 1) {
        double d = c / 2;

        cout << d + 1
    }
    else {
        cout << c / 2;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:22: error: expected ';' before '}' token
   12 |         cout << d + 1
      |                      ^
      |                      ;
   13 |     }
      |     ~
Language: C++

#include<cstdio>
#include<cmath>
#include<climits>
#include<algorithm>
#include<sstream>
#include<iostream>
#include<string>
#include<vector>
#include<queue>
#include<stack>
#include<unordered_set>
#include<unordered_map>
#include<set>
#include<map>
#include<list>

using namespace std;

#define in(s) cin >> s
#define out(s) cout << s << endl
#define rep(i,n) for(int i=0; i<n; i++)
#define rept(i,a,b) for(int i=a; i<b; i++)
#define ll long long
#define MOD 1000000007

#define IMIN INT_MIN;
#define IMAX INT_MAX;


int main(){
    ll H,W;
    int main(){
        cin>>H>>W;
        ll ans=H*W;
        if(W==1||H==1){
            out(1);
            return 0;
        }
        if(ans%2)out(ans/2+1);
        else out(ans/2);
    }

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:13: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   32 |     int main(){
      |             ^~
a.cc:32:13: note: remove parentheses to default-initialize a variable
   32 |     int main(){
      |             ^~
      |             --
a.cc:32:13: note: or replace parentheses with braces to value-initialize a variable
a.cc:32:15: error: a function-definition is not allowed here before '{' token
   32 |     int main(){
      |               ^
Language: C++

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

ll main()
{
  ll h, w;
  cin >> h >> w;

  cout << (h * w + 1) / 2;
}

Compiler output:
a.cc:7:1: error: '::main' must return 'int'
    7 | ll main()
      | ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main( )
{
	long long a,b;
	cin>>a>>b;
	if(a=1&&b=1)
	{
		cout<<1;
		return 0;
	}
	if(a*b%2!=0)
	{
		cout<<a*b/2+1;
		return 0;
	}
	
	cout<<a*b/2;	
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:15: error: lvalue required as left operand of assignment
    7 |         if(a=1&&b=1)
      |              ~^~~
Language: C++

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

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<pair<int,int>, null_type,less<pair<int, int> >, rb_tree_tag,tree_order_statistics_node_update>

#define NEWLINE         cerr << "\n";
#define HOISE           cerr << "hoise " << __LINE__ << "\n"
#define PAUSE           system("pause")
#define DEBUG(x)        cerr << #x << " = " << x << "\n"
#define READ            freopen("D:\\moidda CPP\\alu.txt", "r", stdin)
#define WRITE           freopen("D:\\moidda CPP\\vorta.txt", "w", stdout)
#define FASTIO          ios_base::sync_with_stdio(false);cin.tie(NULL)
#define MASK(x)         for(int i = 0; i < 8; i++){ if(x&(1<<i)){ cout << i << " "; } } cout << endl;

#define INF             1e9
#define INFL            8e18
#define XX              first
#define YY              second
#define PB              push_back
#define MP              make_pair

typedef long long ll;
typedef pair<int, int > pii;
typedef pair<ll, ll> pll;
typedef pair<double, double> pff;

const int MAX = 1e5 + 5;
const int MAXLOG = log2(MAX) + 2;
const int MAXN = 1e6 + 2;
const int MOD = 998244353 ;
const double PY = acos(-1.0);
const double EPS = 1E-9;

int32_t main()
{
#ifndef ONLINE_JUDGE
//    READ;
//    WRITE;
#endif // ONLINE_JUDGE

    FASTIO;

    ll r, c;
    cin >> r >> c;

    if(min(r,c) == 1){
        cout << 1;
        return;
    }

    ll ans = r*(c/2);
    if(c%2 == 1) ans += r/2;
    if(r%2 == 1) ans++;
    cout << ans;

    return 0;
}



Compiler output:
a.cc: In function 'int32_t main()':
a.cc:51:9: error: return-statement with no value, in function returning 'int32_t' {aka 'int'} [-fpermissive]
   51 |         return;
      |         ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std ;
#define ll long long int
int main(){
ll , h , w ;
  cin >> h >> w ;
  if((h * w) % 2 == 0)
    cout << (h * w) / 2 ;
  else
    cout << (((h * w) - 1) / 2 ) + 1 ; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:4: error: expected unqualified-id before ',' token
    5 | ll , h , w ;
      |    ^
Language: C++

#include<bits/stdc++.h>

using namespace std;

int main() {
	int h, w;

	cin >> h >> k;

	if ((h*k) % 2 == 0) {
		cout << h * k << endl;
	}
	else {
		cout << h * k + 1 << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: 'k' was not declared in this scope
    8 |         cin >> h >> k;
      |                     ^
Language: C++

#include <bits/stdc++.h>

using namespace std;


typedef long long ll;

const int M = 1e9+7 ;


int main(){

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    ll h , w; 
    cin >> h >> w; 

    ll tot  = h*w ;

    if ((w == 1) || (h == 1)){
        cout << 1 << "\n";
        return; 
    }
    if (tot % 2){
        cout  << tot - (tot/2) << "\n";
    }
    else {
        cout << tot/2 << "\n";
    }
    
  
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:23:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
   23 |         return;
      |         ^~~~~~
Language: C++

int main(){
    int64_t tate,yoko;
    int64_t ans=0;
    cin >> tate >> yoko;
    int64_t hantei = tate*yoko;

    if(tate ==1 || yoko ==1) ans=1;
    else if(hantei%2 ==0) ans = hantei/2;
    else if(hantei%2 ==1) ans= hantei/2+1;

    cout << ans << endl;
    return 0;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:5: error: 'int64_t' was not declared in this scope
    2 |     int64_t tate,yoko;
      |     ^~~~~~~
a.cc:1:1: note: 'int64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
  +++ |+#include <cstdint>
    1 | int main(){
a.cc:3:12: error: expected ';' before 'ans'
    3 |     int64_t ans=0;
      |            ^~~~
      |            ;
a.cc:4:5: error: 'cin' was not declared in this scope
    4 |     cin >> tate >> yoko;
      |     ^~~
a.cc:4:12: error: 'tate' was not declared in this scope
    4 |     cin >> tate >> yoko;
      |            ^~~~
a.cc:4:20: error: 'yoko' was not declared in this scope
    4 |     cin >> tate >> yoko;
      |                    ^~~~
a.cc:5:12: error: expected ';' before 'hantei'
    5 |     int64_t hantei = tate*yoko;
      |            ^~~~~~~
      |            ;
a.cc:7:30: error: 'ans' was not declared in this scope
    7 |     if(tate ==1 || yoko ==1) ans=1;
      |                              ^~~
a.cc:8:13: error: 'hantei' was not declared in this scope
    8 |     else if(hantei%2 ==0) ans = hantei/2;
      |             ^~~~~~
a.cc:8:27: error: 'ans' was not declared in this scope
    8 |     else if(hantei%2 ==0) ans = hantei/2;
      |                           ^~~
a.cc:9:27: error: 'ans' was not declared in this scope
    9 |     else if(hantei%2 ==1) ans= hantei/2+1;
      |                           ^~~
a.cc:11:5: error: 'cout' was not declared in this scope
   11 |     cout << ans << endl;
      |     ^~~~
a.cc:11:13: error: 'ans' was not declared in this scope
   11 |     cout << ans << endl;
      |             ^~~
a.cc:11:20: error: 'endl' was not declared in this scope
   11 |     cout << ans << endl;
      |                    ^~~~
Language: C++

#include <bits/stdc++.h>
#define max(x, y) ((x) > (y) ? (x) : (y))
#define min(x, y) ((x) < (y) ? (x) : (y))
#define rep(i,a,m) for((i) = (a) ; (i) < (m) ; ++(i))
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(x) x.begin(),x.end()
#define rall(x) x.end(),x.begin()
#define sz(x) ((int)x.size())
using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int,int> pi;
int a, b, c, i, j, k;
long long ans = 0LL;
int main ()
{
    ll T,W;
	scanf("%lld%lld",&T,&W);
    ll U = T*W;
    if (T == 1 || W == 1) {
        cout << 1 << endl;
         return;
    }
    if (U%2) {
        cout << U/2 + 1LL << endl;
    } else {
        cout << U/2 << endl;
    }
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:10: error: return-statement with no value, in function returning 'int' [-fpermissive]
   30 |          return;
      |          ^~~~~~
Language: C++

#include<iostream>
using namespace std;
int main()
{
int h, w;
cin>>h>>w;
if(h%2==0 || w%2==0)
{
h=(h*w)/2;
}
else
{
h=(h*w)/2+1
}
cout<<h;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:12: error: expected ';' before '}' token
   13 | h=(h*w)/2+1
      |            ^
      |            ;
   14 | }
      | ~
Language: C++

#include <algorithm>
#include <cmath>
#include <deque>
#include <iostream>
#include <map>
#include <set>
#include <tuple>
#include <vector>
using namespace std;
typedef long long ll;

int main() {
  ll H, W;
  cin >> H >> W;
  ll a = H * W;
  ll ans = 0;
  for (int h = 0; h < H; h++) {
    if (h % 2 == 0)
      ans += (W + 1) / 2;
    else
      ans += W / 2;
  }
  cout << ans << endl;
  return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:24:12: error: expected '}' at end of input
   24 |   return 0;
      |            ^
a.cc:12:12: note: to match this '{'
   12 | int main() {
      |            ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  int h,w;
  cin >> h >> w;
  if(h%2==0){
    cout << h/2*w;
  }else if(w%2==0){
    cout << (w/2)*h;
  }else{
    cout << (h-1)/2*w;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:2: error: expected '}' at end of input
   12 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main () {
    long long n, m;
    cin >> n >> m;

    if (n % 2 != 0 && m % 2 != 0) cout << (n / 2 + 1) * (m / 2 + 1) + (n / 2) * (m / 2);
    else if (n % 2 != 0) cout << (n / 2 + 1) * (m / 2) + (n / 2) * (m / 2);
    else if (m % 2 != 0) cout << (n / 2) * (m / 2 + 1) + (n / 2) * (m / 2);
    else cout << n * m / 2;

}
~                                                                                                                  
~             

Compiler output:
a.cc:16:1: error: expected class-name before '~' token
   16 | ~
      | ^
Language: C++

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <cctype>
#include <locale>
#include <cmath>
#include <iomanip>
#include <numeric>

using namespace std;

int main(){
    long H,W;
    cin >> H >> W;
    auto a = W * loop;
    // cout << odd * loop + even * loop << endl;
    if(H % 2 == 1){
        cout << a + W / 2 + 1 << endl;
    } else {
        cout << a << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:18: error: 'loop' was not declared in this scope
   16 |     auto a = W * loop;
      |                  ^~~~
Language: C++

#include <functional>
#include <queue>
#include <vector>
#include <iostream>
#include <cstdint>
#include <cstring>
#include <algorithm>
using namespace std;

int main()
{
  	long long int h, w;

	cin >> h;
	cin >> w;

	cout << (long long int)((long long double)(h*w)/2+0.5);
  
  	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:39: error: 'long long' specified with 'double'
   17 |         cout << (long long int)((long long double)(h*w)/2+0.5);
      |                                       ^~~~
Language: C++

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

using namespace std;

int main(){
	double a, b, c;
	cin >> a >> b >> c;
	sqrt(a);
	sqrt(b);
	sqrt(c);
	if (a + b < c) {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}
	return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'sqrt' was not declared in this scope
   12 |         sqrt(a);
      |         ^~~~
a.cc:21:18: error: expected '}' at end of input
   21 |         return 0;
      |                  ^
a.cc:9:11: note: to match this '{'
    9 | int main(){
      |           ^
Language: C

include<stdio.h>
int main()
{
  long int r,c,b;
  scanf("%ld%ld",&r,&c);
  b=((r/2)*c)+(((c/2)+(c%2))*(r%2));
  printf("%ld",b);
  return 0;
}


Compiler output:
main.c:1:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    1 | include<stdio.h>
      |        ^
Language: C++

# include <iostream>

/*
int main() {
    int K;
    std::cin >> K;

    int N[] = { 1, 1, 1, 2, 1, 2, 1, 5, 2, 2, 1, 5, 1, 2, 1, 14, 1, 5, 1, 5, 2, 2, 1, 15, 2, 2, 5, 4, 1, 4, 1, 51 };

    std::cout << N[K-1];

    return 0;
}
*/

int main() {
    long long W, H;

    std::cin >> H >> W;

    long long ans = ceil(W/2.0) * ceil(H/2.0) + (W/2) * (H/2);

    std::cout << ans;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:21: error: 'ceil' was not declared in this scope
   21 |     long long ans = ceil(W/2.0) * ceil(H/2.0) + (W/2) * (H/2);
      |                     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
	long long int h, w;
	long long int count;
	if(h == 1 || w == 1){
		cout << 1 << endl;
		return 0;
	}
	count = ((w + 1) / 2 * ((h + 1) / 2) + (w / 2) * (h / 2);
	cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:65: error: expected ')' before ';' token
   10 |         count = ((w + 1) / 2 * ((h + 1) / 2) + (w / 2) * (h / 2);
      |                 ~                                               ^
      |                                                                 )
Language: C++

#include <iostream>

typedef long long ll;

int main(){
    ll m, n;
    cin >> m >> n;

    cout << (m*n+1)/2 << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |     cin >> m >> n;
      |     ^~~
      |     std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |     cout << (m*n+1)/2 << endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:9:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    9 |     cout << (m*n+1)/2 << endl;
      |                          ^~~~
      |                          std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <iostream>
using namespace std;

int main()
{
    int h ,w;
    cin>>h>>w;
    int x,y;
    int ans;
    if(h%2==0)
    {
        x=h/2;
        ans=x*w;
    }
    else
    {
        if(w%2==0)
        {
            ans=(((h/2)+1)+(h/2))*w/2;
        }
        else{
            ans=((h/2)+1)*((w/2)+1)+(h/2)*(w/2);
        }
    }
    cout<<ans"\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:14: error: expected ';' before string constant
   25 |     cout<<ans"\n";
      |              ^~~~
      |              ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
	long long int h, w;
	long long int count;
	if(h == 1 || w || 1){
		cout << 1 << endl;
		return 0;
	}
	count = ((w + 1) / 2 * ((h + 1) / 2) + (w / 2) * (h / 2);
	cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:65: error: expected ')' before ';' token
   10 |         count = ((w + 1) / 2 * ((h + 1) / 2) + (w / 2) * (h / 2);
      |                 ~                                               ^
      |                                                                 )
Language: C

include<stdio.h>
int main()
{
  int r,c,b;
  scanf("%d%d",&r,&c);
  b=((r/2)*c)+(((c/2)+(c%2))*(r%2));
  printf("%d",b);
  return 0;
}

Compiler output:
main.c:1:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    1 | include<stdio.h>
      |        ^
Language: Java

import java.util.*;
         
class Main{
    public static void main(String[] args) {
        
        try(Scanner sc = new Scanner(System.in)){
 
            Long height = sc.nextLong();
            Long width = sc.nextLong();

            Long ans = 0;

            if(height % 2 == 0 || width % 2 == 0){
                ans = height * width / 2;
            }else{
                ans = (height * width + 1) / 2;
            }

            System.out.println(ans);
 
        }catch(Exception e){
            e.printStackTrace();
        }        
    }
}

Compiler output:
Main.java:11: error: incompatible types: int cannot be converted to Long
            Long ans = 0;
                       ^
1 error
Language: C++

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

int main() {
long long  H,W;
    cin >> H >> W ;
unsinged long long x=H*W;
if (H==1 || W==1)
  cout << 1 << endl;
  else  cout << (x+1)/2 << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:1: error: 'unsinged' was not declared in this scope; did you mean 'unsigned'?
    7 | unsinged long long x=H*W;
      | ^~~~~~~~
      | unsigned
a.cc:10:18: error: 'x' was not declared in this scope
   10 |   else  cout << (x+1)/2 << endl;
      |                  ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long , w , k = 2;
  cin >> h >> w;
  cout<< ceil((h*w)//k);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:4:13: error: expected unqualified-id before ',' token
    4 |   long long , w , k = 2;
      |             ^
a.cc:5:10: error: 'h' was not declared in this scope
    5 |   cin >> h >> w;
      |          ^
Language: C++

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

int main() {

  
  long int H, W;
  cin >> H >> W;

  if(H != 1 && W != 1){
  cout << (H * W + 1)  / 2 << endl; // 1つめである25を出力
  }
  else {
    cout << 0 << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:2: error: expected '}' at end of input
   16 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

#define rep(i,n) for(ll i=0;i<(n);++i)
using ll = long long;
using pll = pair<ll,ll>;
constexpr ll INF = (1LL<<60);
constexpr ll MOD = (1e9+7);
//constexpr ll MOD = (998244353);
template<class T> bool chmax(T &a,const T &b){if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a,const T &b){if(a>b){a=b;return 1;}return 0;}
#if loc||debg||local||debug
void dump(){cerr<<endl;}
template<class T,class... Ts> void dump(T&& h, Ts&&... t){cerr<<h<<", ";dump(forward<Ts>(t)...);}
#else
template<class T,class... Ts> void dump(T&& h, Ts&&... t){}
#endif
template<class T> istream &operator>>(istream&is,vector<T>&v){for(auto &elemnt:v)is>>elemnt;return is;}
template<class T,class U> istream &operator>>(istream&is,pair<T,U>&p){is>>p.first>>p.second;return is;}
template<class T> ostream &operator<<(ostream& os,vector<T>const& v){for(auto const& vi:v)os<<vi<<" ";return os;}
template<class T>vector<T> vec(size_t a){return vector<T>(a);}
template<class T, class... Ts>auto vec(size_t a, Ts... ts){return vector<decltype(vec<T>(ts...))>(a, vec<T>(ts...));}
template<class T>vector<T> _vec(size_t a,T v){return vector<T>(a,v);}
template<class T, class... Ts>auto _vec(size_t a, Ts... ts){return vector<decltype(_vec<T>(ts...))>(a, _vec<T>(ts...));}

int main(){

  ll h,w;
  cin>>h>>w;

  ll ans = 0;
  for(ll i=1;i<=h;++i){
    if(i&1){
      if(w&1)ans+=w/2+1;
      else ans+=w/2;
    }else{
      ans+= w/2;
  }
  cout<<(ans)<<endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:2: error: expected '}' at end of input
   41 | }
      |  ^
a.cc:26:11: note: to match this '{'
   26 | int main(){
      |           ^
Language: C++

#include<functional>
#include<cfenv>
#include<cmath>
#include<string>
#include<queue>
#include<stack>
#include<map>
#include<set>

#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define vint vector<int>
#define vvint vector<vint>
#define P pair<int,int>
#define INT_MAX 2147483647
#define MOD 1000000007
using namespace std;
typedef long long ll;


int main(void) {
	ll h, w; cin >> h >> w;	
	cout << (h*w+1)/2 << endl;
	return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:21:18: error: 'cin' was not declared in this scope
   21 |         ll h, w; cin >> h >> w;
      |                  ^~~
a.cc:9:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    8 | #include<set>
  +++ |+#include <iostream>
    9 | 
a.cc:22:9: error: 'cout' was not declared in this scope
   22 |         cout << (h*w+1)/2 << endl;
      |         ^~~~
a.cc:22:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:22:30: error: 'endl' was not declared in this scope
   22 |         cout << (h*w+1)/2 << endl;
      |                              ^~~~
a.cc:9:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    8 | #include<set>
  +++ |+#include <ostream>
    9 |
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int H,W;
  cin>>H>>W;
  if(H*W%2==0) cout<<H*W/2<<endl
    else cout<<H*W/2+1<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:33: error: expected ';' before 'else'
    6 |   if(H*W%2==0) cout<<H*W/2<<endl
      |                                 ^
      |                                 ;
    7 |     else cout<<H*W/2+1<<endl;
      |     ~~~~
Language: C++

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

int main()
{
 ios_base::sync_with_stdio(0);
 cin.tie(0);
 cout.tie(0);
 int t=1;
 //cin>>t;
 while(t--) {
     
    long long int a,b;
    cin>>a>>b;
    if(a==||b==1){
    cout<<1;continue;}
    if((a*b)%2==1)
      cout<<((a*b)/2)+1;
    else
    cout<<(a*b)/2;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:11: error: expected primary-expression before '||' token
   15 |     if(a==||b==1){
      |           ^~
Language: C++

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

int main(){
 int h,w; cin >> h >> w;
 if(h%2==0&&w%2==0){
   cout << h*W/2 << endl;
 }
  if(h%2==0&&w%2!=0){
    cout << h*w/2+h/2 << endl;
  }
  if(h%2!=0&&w%2==0){
    cout << h*w/2+w/2 <<endl;
  }
  if(h%2!=0&&w%2!=0){
    cout << h*w/2+h/2+w/2+1 << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: 'W' was not declared in this scope
    7 |    cout << h*W/2 << endl;
      |              ^
Language: Java

import java.util.*;

public class Main {

	public static void main(String[] args) {
			
		Scanner sc = new Scanner(System.in);
		long H = sc.nextLong();
		long W = sc.nextLong();
		if (H == 1 || W == 1) {
			System.out.print(1);
		} else if (H % 2 == 1 && W % 2 == 1) {
			if (H)
			System.out.print(H*W/2+1);
		} else {
			System.out.print(H*W/2);
		}
	}
}

Compiler output:
Main.java:13: error: incompatible types: long cannot be converted to boolean
			if (H)
			    ^
1 error
Language: C++

int main(){
   return (H - H % 2) * (W - W % 2) + (H / 2 + H % 2);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:12: error: 'H' was not declared in this scope
    2 |    return (H - H % 2) * (W - W % 2) + (H / 2 + H % 2);
      |            ^
a.cc:2:26: error: 'W' was not declared in this scope
    2 |    return (H - H % 2) * (W - W % 2) + (H / 2 + H % 2);
      |                          ^
Language: Java

import java.util.*;
import java.math.*;
class Main {
    //
    static final int MOD = 1_000_000_007; // 10^9+7
    //static final int MAX = 2_147_483_646; // intの最大値
    static final int INF = 1_000_000_000; // 10^9
    static final int MAX = 10_000_000;
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long w = sc.nextLong();
        long ans = 0;
        if(h%2==0){
            ans = h*w/2;
        }else{
            if(w%2==0){
                ans = h*w/2;
            }else{ 
                ans = h*(w+1)/2-h/2;
                int tmp = w*(h+1)/2-w/2;
                if(ans < tmp)ans = tmp;
            }
        }
        System.out.println(ans);
    }
    
}



Compiler output:
Main.java:21: error: incompatible types: possible lossy conversion from long to int
                int tmp = w*(h+1)/2-w/2;
                                   ^
1 error
Language: C++

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

int main(){
 int h,w; cin >> h >> w;
 if(h%2=0&&w%2=0){
   cout << h*W/2 << endl;
 }
  if(h%2=0&&w%2!=0){
    cout << h*w/2+h/2 << endl;
  }
  if(h%2!=0&&w%2=0){
    cout << h*w/2+w/2 <<endl;
  }
  if(h%2!=0&&w%2!=0){
    cout << h*w/2+h/2+w/2+1 << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:10: error: lvalue required as left operand of assignment
    6 |  if(h%2=0&&w%2=0){
      |         ~^~~~~
a.cc:7:14: error: 'W' was not declared in this scope
    7 |    cout << h*W/2 << endl;
      |              ^
a.cc:9:7: error: lvalue required as left operand of assignment
    9 |   if(h%2=0&&w%2!=0){
      |      ~^~
a.cc:12:12: error: lvalue required as left operand of assignment
   12 |   if(h%2!=0&&w%2=0){
      |      ~~~~~~^~~~~
Language: C++

#include<iostream>
using namespace std;

int main(){
	long　long　int h,w;
	cin>>h>>w;
	long　longint　 ans=0;
	ans=h*w;
	if((h*w)%2==1) ans=ans+1;
	if(h==1 || w==1){
		 cout<<1;
	}else{
		cout<<ans/2;
	}
}

Compiler output:
a.cc:5:9: error: extended character 　 is not valid in an identifier
    5 |         long　long　int h,w;
      |         ^
a.cc:5:9: error: extended character 　 is not valid in an identifier
a.cc:7:9: error: extended character 　 is not valid in an identifier
    7 |         long　longint　 ans=0;
      |         ^
a.cc:7:9: error: extended character 　 is not valid in an identifier
a.cc: In function 'int main()':
a.cc:5:9: error: 'long\U00003000long\U00003000int' was not declared in this scope
    5 |         long　long　int h,w;
      |         ^~~~~~~~~~~~~~~
a.cc:6:14: error: 'h' was not declared in this scope
    6 |         cin>>h>>w;
      |              ^
a.cc:6:17: error: 'w' was not declared in this scope
    6 |         cin>>h>>w;
      |                 ^
a.cc:7:9: error: 'long\U00003000longint\U00003000' was not declared in this scope
    7 |         long　longint　 ans=0;
      |         ^~~~~~~~~~~~~~~
a.cc:8:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
    8 |         ans=h*w;
      |         ^~~
      |         abs
Language: C++

#include <cstdio>
using namespace std;

int main()
{
	long long int n,m;

	scanf("%lld%lld",&n,&m);
	if(n==1 || m==1)
	{
		printf("1");
		return 0:
	}

	printf("%lld",(n*m+1)/2);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:25: error: expected ';' before ':' token
   12 |                 return 0:
      |                         ^
      |                         ;
a.cc:12:25: error: expected primary-expression before ':' token
Language: C++

#include <iostream>
#include <map>
#include <vector>
#include <cmath>
#include <string>
#include <cstring>
#include <algorithm>
#include <climits>
#include <stack>
#include <queue>
#include <set>
#include <cctype>
#include <bitset>
#include <type_traits>

#include <list>
using namespace std;

#define REP(i, n) for (int i = 0; i < (n); ++i)
#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define YES(j) cout << (j ? "YES" : "NO") << endl;
#define Yes(j) std::cout << (j ? "Yes" : "No") << endl;
#define yes(j) std::cout << (j ? "yes" : "no") << endl;

int main(void)
{
    int h, w;
    cin >> h >> w;
    long long ans = h * w / 2;
    if (h % 2 == 1 && w % 2 == 1)
    {
        ans++;
    }
    cout << ans << endl;


Compiler output:
a.cc: In function 'int main()':
a.cc:34:25: error: expected '}' at end of input
   34 |     cout << ans << endl;
      |                         ^
a.cc:26:1: note: to match this '{'
   26 | {
      | ^
Language: C++

#include<iostream>
using namespace std;

int main(){
	__int64 h,w;
	cin>>h>>w;
	__int64 ans=0;
	ans=h*w;
	if((h*w)%2==1) ans=ans+1;
	if(h==1 || w==1){
		 cout<<1;
	}else{
		cout<<ans/2;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
    5 |         __int64 h,w;
      |         ^~~~~~~
      |         __int64_t
a.cc:6:14: error: 'h' was not declared in this scope
    6 |         cin>>h>>w;
      |              ^
a.cc:6:17: error: 'w' was not declared in this scope
    6 |         cin>>h>>w;
      |                 ^
a.cc:7:16: error: expected ';' before 'ans'
    7 |         __int64 ans=0;
      |                ^~~~
      |                ;
a.cc:8:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
    8 |         ans=h*w;
      |         ^~~
      |         abs
Language: C++

z#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll,ll> l_l;
const int INF=1001001000;
const int mINF=-1001001000;
const ll LINF=1010010010010010000;
template<class T> inline bool chmin(T& a, T b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template<class T> inline bool chmax(T& a, T b) {
if (a < b) {
a = b;
return true;
}
return false;
}
int main(){
    ll h,w;cin >> h >> w;
    ll g=h*w;
    if(h==1&&w>1){
        cout << 1 << endl;
        return 0;
    }
    else if(w==1&&h>1){
        cout << 1 << endl;
        return 0;
    }
    if(g%2==0) cout << g/2 << endl;
    else cout << g/2+1 << endl;
    return 0;
}

Compiler output:
a.cc:1:2: error: stray '#' in program
    1 | z#include <bits/stdc++.h>
      |  ^
a.cc:1:1: error: 'z' does not name a type
    1 | z#include <bits/stdc++.h>
      | ^
a.cc:5:9: error: 'pair' does not name a type
    5 | typedef pair<int,int> P;
      |         ^~~~
a.cc:6:9: error: 'pair' does not name a type
    6 | typedef pair<ll,ll> l_l;
      |         ^~~~
a.cc: In function 'int main()':
a.cc:25:12: error: 'cin' was not declared in this scope
   25 |     ll h,w;cin >> h >> w;
      |            ^~~
a.cc:28:9: error: 'cout' was not declared in this scope
   28 |         cout << 1 << endl;
      |         ^~~~
a.cc:28:22: error: 'endl' was not declared in this scope
   28 |         cout << 1 << endl;
      |                      ^~~~
a.cc:32:9: error: 'cout' was not declared in this scope
   32 |         cout << 1 << endl;
      |         ^~~~
a.cc:32:22: error: 'endl' was not declared in this scope
   32 |         cout << 1 << endl;
      |                      ^~~~
a.cc:35:16: error: 'cout' was not declared in this scope
   35 |     if(g%2==0) cout << g/2 << endl;
      |                ^~~~
a.cc:35:31: error: 'endl' was not declared in this scope
   35 |     if(g%2==0) cout << g/2 << endl;
      |                               ^~~~
a.cc:36:10: error: 'cout' was not declared in this scope
   36 |     else cout << g/2+1 << endl;
      |          ^~~~
a.cc:36:27: error: 'endl' was not declared in this scope
   36 |     else cout << g/2+1 << endl;
      |                           ^~~~
Language: C++

(H - H % 2) * (W - W % 2) + (H / 2 + H % 2)

Compiler output:
a.cc:1:3: error: expected ')' before '-' token
    1 | (H - H % 2) * (W - W % 2) + (H / 2 + H % 2)
      | ~ ^~
      |   )