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

#include<bits/stdc++.h>
using namespace std;
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define mp make_pair
#define all(c) (c).begin(),(c).end()
#define rall(c) (c).rbegin(),(c).rend()
#define double long double
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll inf=1e9+7;
const ll mod=1e9+7;
//拡張ユークリッドの互除法
long long extGCD(long long a,long long mod,long long &x,long long &y){
    if(mod==0){
        x=1;
        y=0;
        return a;
    }
    long long d=extGCD(mod,a%mod,y,x);//上に上がるときにswap(x,y)すると見る
    y-=(a/mod)*x;
    return d;
}
//modの逆元
long long invmod(long long a,long long mod){
    long long x,y;
    extGCD(a,mod,x,y);
    x%=mod;
    if(x<0)x+=mod;
    return x;
}
ll fac[200010],finv[200010],inv[200010];
void combinit(){
    fac[0]=fac[1]=1;
    finv[0]=finv[1]=1;
    inv[1]=1;
    REP(i,2,100010){
        fac[i]=fac[i-1]*i%inf;
        inv[i]=invmod(i,inf);
        finv[i]=finv[i-1]*inv[i]%inf;
    }
}
ll comb(ll n,ll k){
    if(n<k)return 0;
    if(n<0||k<0)return 0;
    return fac[n]*(finv[k]*finv[n-k]%inf)%inf;
}
int main(){
    combinit();
    ll n,m,k;cin>>n>>m>>k;
    ll d=comb(n*m-2,k-2)%inf;
    ll cntn=0,cntm=0;
    REP(i,1,n+1)cntn=(cntn+((((2*i-n-1)%inf)*i)%inf)%inf)%inf;
    REP(i,1,m+1)cntm=(cntm+((((2*i-m-1)%inf)*i)%inf)%inf)%inf;
    cout<<((((((m*m)%inf)*d)%inf)*cntn)%inf%ainf+((((n*d)%inf*n)%inf)*cntm)%inf)%inf<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:57:45: error: 'ainf' was not declared in this scope; did you mean 'sinf'?
   57 |     cout<<((((((m*m)%inf)*d)%inf)*cntn)%inf%ainf+((((n*d)%inf*n)%inf)*cntm)%inf)%inf<<endl;
      |                                             ^~~~
      |                                             sinf
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define fr(i,n) for(int i=0;i<n;i++)
#define ifr(i,n) for(int i=n-1;i>=0;i--)

int main() {
    int n,m,k;
    ll a = 1000000007;
    ll ans=0;
    ll kai=0;
	cin >> n >>m >>k;
    ll size = m*n-2;
    ll v[size][size];
    fr(i,size){
      fr(j,size){
        v[i][j]=0;
     }
    }
    for (int i = 0; i < size; i++) {
     v[i][0] = 1;
     v[i][i] = 1;
    }
    for (int j = 2; j < size; j++) {
     for (int k = 1; k < j; k++) {
      v[j][k] = (v[j - 1][k - 1] + v[j - 1][k])%a;
     }
    }
    fr(i,n){
      kai+=i*(n-i)*m*m;
      kai%=a;
    }
    kai*=v[n*m-2][k-2]%a
    ans+=kai;
    kai=0;
    fr(i,m){
      kai+=i*(m-i)*n*n;
      kai%=a;
    }
    kai*=v[n*m-2][k-2]%a
    ans+=kai;

    cout << ans<<endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:33:25: error: expected ';' before 'ans'
   33 |     kai*=v[n*m-2][k-2]%a
      |                         ^
      |                         ;
   34 |     ans+=kai;
      |     ~~~                  
a.cc:40:25: error: expected ';' before 'ans'
   40 |     kai*=v[n*m-2][k-2]%a
      |                         ^
      |                         ;
   41 |     ans+=kai;
      |     ~~~
Language: C++

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

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

int N, M, K;

const int MAX = 510000;
const int MOD = 1000000007;

long long fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

// 二項係数計算
long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

int main(){
    cin >> N >> M >> K;

    COMinit();
    ll ans = 0;
    for(int i=1;i<M;i++){
        ans += (ll) (((M - i) * N % MOD) * N % MOD) * i % MOD;
    }
    for(int i=1;i<N;i++){
        ans += (ll) (((N - i) * M % MOD) * M % MOD) * i % MOD);
    }
    ans = ans * COM(N * M - 2, K - 2) % MOD;

    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:62: error: expected ';' before ')' token
   42 |         ans += (ll) (((N - i) * M % MOD) * M % MOD) * i % MOD);
      |                                                              ^
      |                                                              ;
Language: C++

#include <iostream>
using namespace std;
typedef long long ll;
const ll MOD = 1000000007;
const ll MAX = 510000;


ll power(ll a,ll b){
	ll res = 1;
	while(b>0){
		if(b&1){
			res = res*a%MOD;
		}
		a=a*a%MOD;
		b = b >> 1;
	}
	return res;
}

ll gyaku(ll a){
	return power(a,MOD-2);
}

ll kaijou(ll a){
	ll res = 1;
	for(int i = 1;i<=a;i++){
		res = res*i%MOD;
	}
	return res;
}

ll comb(ll a,ll b){
	return kaijou(a)*gyaku(kaijou(b))%MOD*gyaku(kaijou(a-b))%MOD;
}
	


int main(){
	int a,b;
	cin>>a>>b;
    ll ans = comb((N*M-2),(K-2));
    ll p = ((N*(N+1)*(2*N+1)/6-N*(N+1)/2)*M*M)%MOD;
    ll q = ((M*(M+1)*(2*M+1)/6-M*(M+1)/2)*N*N)%MOD;
    cout << (ans*(p+q)/2)%MOD << endl;
}
	

Compiler output:
a.cc: In function 'int main()':
a.cc:41:20: error: 'N' was not declared in this scope
   41 |     ll ans = comb((N*M-2),(K-2));
      |                    ^
a.cc:41:22: error: 'M' was not declared in this scope
   41 |     ll ans = comb((N*M-2),(K-2));
      |                      ^
a.cc:41:28: error: 'K' was not declared in this scope
   41 |     ll ans = comb((N*M-2),(K-2));
      |                            ^
Language: C++

#include"pch.h"



#include<iostream>
#include<vector>
#include<string>
#include<stack>
#include<queue>
#include<map>
#include<algorithm>
using namespace std;
const long long mod = 1e9 + 7;
const long long MAX_P = 1e5;
typedef long long ll;
long long qp(int a, ll b) { int ans = 1; do { if (b & 1)ans = 1ll * ans*a; a = 1ll * a*a; } while (b >>= 1); return ans; }
long long qp(int a, ll b, int mo) { int ans = 1; do { if (b & 1)ans = 1ll * ans*a%mo; a = 1ll * a*a%mo; } while (b >>= 1); return ans; }
int gcd(int a, int b) { return b ? gcd(b, a%b) : a; }
int dx[4] = { 1,0,-1,0 };
int dy[4] = { 0,1,0,-1 };
long long INF = 1e10;
class combination {
public:
	ll fact[MAX_P]; // n! mod pのテーブル(O(p))
	ll p;
	// factテーブルを初期化する
	combination(ll x) {  // x : 余り(1e9 + 7など)
		p = x;
		fact[0] = 1;
		for (ll i = 1; i < MAX_P; i++) {
			fact[i] = fact[i - 1] * i % p;
		}
	}
	//拡張ユークリッドの互除法
	ll extgcd(ll a, ll b, ll& x, ll& y) {
		ll d = a;
		if (b != 0) {
			d = extgcd(b, a%b, y, x);
			y -= (a / b) * x;
		}
		else {
			x = 1; y = 0;
		}
		return d;
	}
	//mod上の逆元
	ll mod_inverse(ll a, ll m) {
		ll x, y;
		extgcd(a, m, x, y); //extgcdが必要
		return (m + x % m) % m;
	}
	//n! = a p^eとしたときの a mod pを求める O(log_p a)
	ll mod_fact(ll n, ll p, ll& e) {
		e = 0;
		if (n == 0) return 1;

		//pの倍数の部分を計算
		ll res = mod_fact(n / p, p, e);
		e += n / p;

		//(p - 1)!≡-1なので、(p-1)!^(n/p)はn/pの偶奇だけで計算できる
		if (n / p % 2 != 0) return res * (p - fact[n % p]) % p;
		return res * fact[n % p] % p;
	}

	//mod p 上の二項係数
	ll mod_comb(ll n, ll k) {
		if (n < 0 || k < 0 || n < k) return 0;
		ll e1, e2, e3;
		ll a1 = mod_fact(n, p, e1), a2 = mod_fact(k, p, e2), a3 = mod_fact(n - k, p, e3);
		if (e1 > e2 + e3) return 0;
		return a1 * mod_inverse(a2 * a3 % p, p) % p;
	}
};
int main() {
	ll n, m, k; cin >> n >> m >> k;
	combination c(mod);
	ll lyn, rn;
	lyn = 0; rn = 0;
	for (int i = 1; i < n; i++) {
		lyn += qp(m, 2, mod) * (n - i)*i;
		lyn %= mod;
	}
	for (int i = 1; i < m; i++) {
		rn += qp(n, 2, mod) * (m - i)*i;
		rn %= mod;
	}
	cout << c.mod_comb(n*m - 2, k - 2) * (lyn + rn) % mod << endl;
	return 0;
}

Compiler output:
a.cc:1:9: fatal error: pch.h: No such file or directory
    1 | #include"pch.h"
      |         ^~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
#include <math.h>
#include <string.h>
#include <map>
#include <random>
#include <numeric>

using namespace std;
typedef long long ll;

const int MOD = 1000000007;
const int MAX = 500000;
long long fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
  fac[0] = fac[1] = 1;
  finv[0] = finv[1] = 1;
  inv[1] = 1;
  for (int i = 2; i < MAX; i++){
    fac[i] = fac[i - 1] * i % MOD;
    inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
    finv[i] = finv[i - 1] * inv[i] % MOD;
  }
}

// 二項係数計算
long long COM(int n, int k){
  if (n < k) return 0;
  if (n < 0 || k < 0) return 0;
  return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

long long FAC(int n){
  return fac[n];
}

long long FINV(int n){
  return finv[n];
}

long long modinv(long long a, long long m) {
    long long b = m, u = 1, v = 0;
    while (b) {
        long long t = a / b;
        a -= t * b; swap(a, b);
        u -= t * v; swap(u, v);
    }
    u %= m;
    if (u < 0) u += m;
    return u;
}

int main() {
  ll N,M,K;
  cin>>N>>M>>K;

  COMinit();

  ll sum=0ll;
  for(int d=0;d<N;d++){
    sum+=d*(N-d)*M*M;
    sum%=MOD
  };
  for(int d=0;d<M;d++){
    sum+=d*(M-d)*N*N;
    sum%=MOD;
  };
  cout<<sum*COM(N*M-2,K-2)%MOD<<endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:66:13: error: expected ';' before '}' token
   66 |     sum%=MOD
      |             ^
      |             ;
   67 |   };
      |   ~
Language: C++

#include <iostream>
using namespace std;

const long long mod  = 1e9 + 7;
long long modpow(long long a, long long n) {
    long long r = 1;
    while(n > 0) {
        r = r * ( (n%2) ? a : 1) % mod;
        a = a * a % mod;
        n /= 2;
    }
    return r;
}

long long modcomb(int n, int k) {
    if ( n < 0 || k < 0 || k > n) return 0;
    k = min(k, n - k); //nCk = nC(n-k)
    long long p = 1, q = 1;
    while ( k > 0 ) {
        p = p * n-- % mod; // p = n*(n-1)*(n-2)...(n-k+1)
        q = q * k-- % mod; // q = k*(k-1)*(k-2)...1
    }
    // 1/q = q^(p-2) (mod p)
    return p * modpow(q, mod - 2) % mod;
}

int main(){
	int N, M, K;
	cin >> N >> M >> K;
    long long x = 0, y = 0;
    for (int d = 1; d < N; ++d){
        x += d * (N-d) % mod;
    }
    x = x * M % mod * M % mod;
    for (int d = 1; d < M; ++d){
        y += d * (M-d) % mod;
    }
    y = y * N % mod * N % mod
    cout << (x + y) % mod * modcomb(N * M - 2, K - 2) % mod << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:38:30: error: expected ';' before 'cout'
   38 |     y = y * N % mod * N % mod
      |                              ^
      |                              ;
   39 |     cout << (x + y) % mod * modcomb(N * M - 2, K - 2) % mod << endl;
      |     ~~~~
Language: C

#include <iostream>
#include <vector>
 
using namespace std;
 
using ll = long long;
 
vector<ll> fact;
vector<ll> ifact;
const int mod = 1e9 + 7;
 
ll mod_pow(ll x, ll n, ll mod) {
  if (n == 0) return 1;
  ll ret = (n & 1) ? x : 1;
  ll half = mod_pow(x, n / 2, mod);
  ret *= half * half % mod;
  return ret % mod;
}
 
void init() {
  const int f_max = 200000;
  fact.resize(f_max + 1);
  ifact.resize(f_max + 1);
  fact[0] = 1;
  for(int i = 1; i <= f_max; i++) {
    fact[i] = (fact[i - 1] * i) % mod;
  }
  ifact[f_max] = mod_pow(fact[f_max], mod - 2, mod);
  for(int i = f_max - 1; i >= 0; i--) {
  	ifact[i] = (ifact[i + 1] * (i + 1)) % mod;
  }
}

ll comb(ll n, ll k) {
  return fact[n] * ifact[n - k] % mod * ifact[k] % mod;
}
 
 
int main() {
  init();
  ll N, M, K;
  cin >> N >> M >> K;
  ll sum = 0;
  for(ll d = 1; d <= N; d++) {
    sum += (d * (N - d)) % mod * M % mod * M % mod;
    sum %= mod;
  }
  for(ll d = 1; d <= M; d++) {
    sum += (d * (M - d)) % mod * N % mod * N % mod;
    sum %= mod;
  }
  cout << sum * comb(N * M - 2, K - 2) % mod << endl;
}

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

#include <iostream>
#include <vector>

using namespace std;

using ll = long long;

vector<ll> fact;
vector<ll> ifact;
const int mod = 1e9 + 7;

ll mod_pow(ll x, ll n, ll mod) {
  if (n == 0) return 1;
  ll ret = (n & 1) ? x : 1;
  ll half = mod_pow(x, n / 2, mod);
  ret *= half * half % mod;
  return ret % mod;
}

void init() {
  fact.resize(200001);
  ifacr.resize(200001);
  fact[0] = 1, ifact[0] = 1;
  for(int i = 1; i <= 200000; i++) {
    fact[i] = (fact[i - 1] * i) % mod;
    ifact[i] = mod_pow(fact[i], mod - 2, mod);
  }
}

ll comb(ll n, ll k) {
  return fact[n] * ifact[n - k] % mod * ifact[k] % mod;
}

int main() {
  init();
  ll N, M, K;
  cin >> N >> M >> K;
  ll sum = 0;
  for(ll d = 1; d <= N; d++) {
    sum += (d * (N - d)) % mod * M % mod * M % mod;
    sum %= mod;
  }
  for(ll d = 1; d <= M; d++) {
    sum += (d * (M - d)) % mod * N % mod * N % mod;
    sum %= mod;
  }
  cout << sum * comb(N * M - 2, K - 2) % mod << endl;
}

Compiler output:
a.cc: In function 'void init()':
a.cc:22:3: error: 'ifacr' was not declared in this scope; did you mean 'ifact'?
   22 |   ifacr.resize(200001);
      |   ^~~~~
      |   ifact
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> V;
const long long MOD=1000000007LL;
const long long INFL=1LL << 60;
const int INF=1<<29;

const int MAX = 210000;

long long fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

// 二項係数計算
long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}


int main(){
    COMinit();
    int N,M,K;
    cin >>N>>M>>K;
    ll ans=0; 
    for(ll i=1;i<N;i++){
        ans+=i*M%MOD*M%MOD*(N-i)%MOD;
        ans%=MOD
    }
    for(ll j=1;j<M;j++){
        ans+=j*N%MOD*N%MOD*(M-j)%MOD;
        ans%=MOD;
    }
    ans=ans*COM(N*M-2,K-2)%MOD;
    cout<<ans<<endl;



    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:17: error: expected ';' before '}' token
   41 |         ans%=MOD
      |                 ^
      |                 ;
   42 |     }
      |     ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for (int(i) = 0; (i) < (n); (i)++)
#define rrep(i, n) for (int(i) = (n)-1; (i) >= 0; (i)--)
 
int mod=1e9+7;

struct modCalc{
	int mod;
	int n;
	bool ok;
	vector<int> fact,invfact;

	modCalc(){};
	modCalc(int _mod,int _n){
		mod=_mod,n=_n;
		fact.resize(n+1,1);
		invfact.resize(n+1,1);
		for(int i=0;i<n;i++)fact[i+1]=fact[i]*(i+1)%mod;
		invfact[n]=modinv(fact[n]);
		for(int i=n;i>1;i--)invfact[i-1]=invfact[i]*i%mod;

	int modpow(int x,int n){
		int ret=1;
		while(n>0){
			if(n&1)(ret*=x)%=mod;
			(x*=x)%=mod;
			n>>=1;
		}
		return ret;
	}

	int modinv(int x){
		return modpow(x,mod-2);
	}

	int nCm(int x,int y){
		if(!ok)init();
		if(y==0)return 1;
		else return fact[x]*invfact[y]%mod*invfact[x-y]%mod;
	}
	int nPm(int x,int y=-1){
		if(y==-1)y=x;
		if(!ok)init();
		return fact[x]*invfact[x-y]%mod;
	}
};

signed main() {
	int n,m,k;cin>>n>>m>>k;

	modCalc md(mod,n*m);
	int combNum=md.nCm(n*m-2,k-2);
	int ret=0;
	for(int i=1;i<n;i++)(ret+=i*(n-i)*m*m)%=mod;
	for(int i=1;i<m;i++)(ret+=i*(m-i)*n*n)%=mod;
	cout<<ret*combNum%mod<<endl;

}

Compiler output:
a.cc:60:2: error: expected '}' at end of input
   60 | }
      |  ^
a.cc:9:15: note: to match this '{'
    9 | struct modCalc{
      |               ^
a.cc: In constructor 'modCalc::modCalc(long long int, long long int)':
a.cc:21:28: error: 'modinv' was not declared in this scope
   21 |                 invfact[n]=modinv(fact[n]);
      |                            ^~~~~~
a.cc:24:32: error: a function-definition is not allowed here before '{' token
   24 |         int modpow(int x,int n){
      |                                ^
a.cc:34:26: error: a function-definition is not allowed here before '{' token
   34 |         int modinv(int x){
      |                          ^
a.cc:38:29: error: a function-definition is not allowed here before '{' token
   38 |         int nCm(int x,int y){
      |                             ^
a.cc:43:32: error: a function-definition is not allowed here before '{' token
   43 |         int nPm(int x,int y=-1){
      |                                ^
a.cc: In member function 'int modCalc::main()':
a.cc:54:24: error: 'struct modCalc' has no member named 'nCm'
   54 |         int combNum=md.nCm(n*m-2,k-2);
      |                        ^~~
a.cc:60:1: warning: no return statement in function returning non-void [-Wreturn-type]
   60 | }
      | ^
a.cc: At global scope:
a.cc:60:2: error: expected unqualified-id at end of input
   60 | }
      |  ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for (int(i) = 0; (i) < (n); (i)++)
#define rrep(i, n) for (int(i) = (n)-1; (i) >= 0; (i)--)
 
int mod=1e9+7;

struct modCalc{
	static int mod;
	int n;
	bool ok;
	vector<int> fact,invfact;
	modCalc(){};
	modCalc(int _mod,int _n){
		mod=_mod,n=_n;
		ok=false;
	};
	void init(){
		fact.resize(n+1,1);
		for(int i=0;i<n;i++)fact[i+1]=fact[i]*(i+1)%mod;
		invfact.resize(n+1,1);
		invfact[n]=modinv(n);
		for(int i=n;i>1;i--)invfact[i-1]=invfact[i]*i%mod;
		ok=true;
	}

	int modpow(int x,int n,int m=-1){
		if(m==-1)m=mod;
		int ret=1;
		while(n>0){
			if(n&1)(ret*=x)%=m;
			(x*=x)%=m;
			n>>=1;
		}
		return ret;
	}

	int modinv(int x,int m=-1){
		if(m==-1)m=mod;
		return modpow(x,m-2,m);
	}

	int nCm(int x,int y){
		if(!ok)init();
		if(y==0)return 1;
		else return fact[x]*invfact[y]%mod*invfact[x-y]%mod;
	}
	int nPm(int x,int y=-1){
		if(y==-1)y=x;
		if(!ok)init();
		return fact[x]*invfact[x-y]%mod;
	}
};



signed main() {
	int n,m,k;cin>>n>>m>>k;

	modCalc md(mod,n*m);
	int combNum=md.nCm(n*m-2,k-2);
	int ret=0;
	for(int i=1;i<n;i++)ret+=i*2*(n-i)*m*m;
	for(int i=1;i<m;i++)ret+=i*2*(m-i)*n*n;
	cout<<ret*combNum<<endl;

}

Compiler output:
/usr/bin/ld: /tmp/ccIujtwC.o: warning: relocation against `_ZN7modCalc3modE' in read-only section `.text._ZN7modCalc3nCmExx[_ZN7modCalc3nCmExx]'
/usr/bin/ld: /tmp/ccIujtwC.o: in function `modCalc::modCalc(long long, long long)':
a.cc:(.text._ZN7modCalcC2Exx[_ZN7modCalcC5Exx]+0x3b): undefined reference to `modCalc::mod'
/usr/bin/ld: /tmp/ccIujtwC.o: in function `modCalc::init()':
a.cc:(.text._ZN7modCalc4initEv[_ZN7modCalc4initEv]+0x6d): undefined reference to `modCalc::mod'
/usr/bin/ld: a.cc:(.text._ZN7modCalc4initEv[_ZN7modCalc4initEv]+0x145): undefined reference to `modCalc::mod'
/usr/bin/ld: /tmp/ccIujtwC.o: in function `modCalc::modpow(long long, long long, long long)':
a.cc:(.text._ZN7modCalc6modpowExxx[_ZN7modCalc6modpowExxx]+0x1e): undefined reference to `modCalc::mod'
/usr/bin/ld: /tmp/ccIujtwC.o: in function `modCalc::modinv(long long, long long)':
a.cc:(.text._ZN7modCalc6modinvExx[_ZN7modCalc6modinvExx]+0x1e): undefined reference to `modCalc::mod'
/usr/bin/ld: /tmp/ccIujtwC.o:a.cc:(.text._ZN7modCalc3nCmExx[_ZN7modCalc3nCmExx]+0x79): more undefined references to `modCalc::mod' follow
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for (int(i) = 0; (i) < (n); (i)++)
#define rrep(i, n) for (int(i) = (n)-1; (i) >= 0; (i)--)
 
int mod=1e9+7;

struct modCalc{
	static int mod;
	int n;
	bool ok;
	vector<int> fact,invfact;
	modCalc(){};
	modCalc(int _mod,int _n){
		mod=_mod,n=_n;
		ok=false;
	};
	void init(){
		fact.resize(n+1,1);
		for(int i=0;i<n;i++)fact[i+1]=fact[i]*(i+1)%mod;
		invfact.resize(n+1,1);
		invfact[n]=modinv(n);
		for(int i=n;i>1;i--)invfact[i-1]=invfact[i]*i%mod;
		ok=true;
	}

	int modpow(int x,int n,int m=-1){
		if(m==-1)m=mod;
		int ret=1;
		while(n>0){
			if(n&1)(ret*=x)%=m;
			(x*=x)%=m;
			n>>=1;
		}
		return ret;
	}

	int modinv(int x,int m=-1){
		if(m==-1)m=mod;
		return modpow(x,m-2,m);
	}

	int nCm(int x,int y){
		if(!ok)init();
		if(y==0)return 1;
		else return fact[x]*invfact[y]%mod*invfact[x-y]%mod;
	}
	int nPm(int x,int y=-1){
		if(y==-1)y=x;
		if(!ok)init();
		return fact[x]*invfact[x-y]%mod;
	}
};



signed main() {
	int n,m,k;cin>>n>>m>>k;

	modCalc md(mod,n*m);
	int combNum=md.nCm(n*m-2,k-2);
	int ret=0;
	for(int i=1;i<n;i++)ret+=i*2*(n-i)*h*h;
	for(int i=1;i<m;i++)ret+=i*2*(m-i)*n*n;
	cout<<ret*combNum<<endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:64:44: error: 'h' was not declared in this scope
   64 |         for(int i=1;i<n;i++)ret+=i*2*(n-i)*h*h;
      |                                            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for (int(i) = 0; (i) < (n); (i)++)
#define rrep(i, n) for (int(i) = (n)-1; (i) >= 0; (i)--)
 
int mod=1e9+7;

struct modCalc{
	int mod,n;
	bool ok;
	vector<int> fact,invfact;
	modCalc(){};
	modCalc(int _mod,int _n){
		mod=_mod,n=_n;
		ok=false;
	};
	void init(){
		fact.resize(n+1,1);
		for(int i=0;i<n;i++)fact[i+1]=fact[i]*(i+1)%mod;
		invfact.resize(n+1,1);
		invfact[n]=modinv(n);
		for(int i=n;i>1;i--)invfact[i-1]=invfact[i]*i%mod;
		ok=true;
	}

	int modpow(int x,int n,int m=mod){
		int ret=1;
		while(n>0){
			if(n&1)(ret*=x)%=m;
			(x*=x)%=m;
			n>>=1;
		}
		return ret;
	}

	int modinv(int x,int m=mod){
		return modpow(x,m-2,m);
	}

	int nCm(int x,int y){
		if(!ok)init();
		if(y==0)return 1;
		else return fact[x]*invfact[y]%mod*invfact[x-y]%mod;
	}
	int nPm(int x,int y=x){
		if(!ok)init();
		return fact[x]*invfact[x-y]%mod;
	}
};



signed main() {
	int n,m,k;cin>>n>>m>>k;

	modcalc md(mod,n*m);
	int combNum=md.nCm(n*m-2,k-2);
	int ret=0;
	for(int i=1;i<n;i++)ret+=i*2*(n-i)*h*h;
	for(int i=1;i<m;i++)ret+=i*2*(m-i)*n*n;
	cout<<ret*combNum<<endl;

}

Compiler output:
a.cc:27:38: error: invalid use of non-static data member 'modCalc::mod'
   27 |         int modpow(int x,int n,int m=mod){
      |                                      ^~~
a.cc:10:13: note: declared here
   10 |         int mod,n;
      |             ^~~
a.cc:37:32: error: invalid use of non-static data member 'modCalc::mod'
   37 |         int modinv(int x,int m=mod){
      |                                ^~~
a.cc:10:13: note: declared here
   10 |         int mod,n;
      |             ^~~
a.cc:46:29: error: parameter 'x' may not appear in this context
   46 |         int nPm(int x,int y=x){
      |                             ^
a.cc: In function 'int main()':
a.cc:57:9: error: 'modcalc' was not declared in this scope; did you mean 'modCalc'?
   57 |         modcalc md(mod,n*m);
      |         ^~~~~~~
      |         modCalc
a.cc:58:21: error: 'md' was not declared in this scope; did you mean 'm'?
   58 |         int combNum=md.nCm(n*m-2,k-2);
      |                     ^~
      |                     m
a.cc:60:44: error: 'h' was not declared in this scope
   60 |         for(int i=1;i<n;i++)ret+=i*2*(n-i)*h*h;
      |                                            ^
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<iomanip>
#include<math.h>
#include<complex>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#include<set>
#include<bitset>
#include<functional>
#include<assert.h>
#include<numeric>
using namespace std;
#define REP(i,m,n) for(int i=(int)(m) ; i < (int) (n) ; ++i )
#define rep(i,n) REP(i,0,n)
using ll = long long;
const int inf=1e9+7;
const ll longinf=1LL<<60 ;
const ll mod=1e9+7 ;


vector<ll> inv,fact,invfact;
void mod_build(int n=101010){
	fact.resize(n+1);
	inv.resize(n+1);
	invfact.resize(n+1);
	fact[0]=inv[0]=invfact[0]=1;
	inv[1]=1;
	rep(i,n){
		fact[i+1]=fact[i]*(i+1)%mod;
		if(i>0)inv[i+1]=mod-inv[mod%(i+1)]*(mod/(i+1))%mod;
		invfact[i+1]=invfact[i]*inv[i+1]%mod;
	}
}
ll perm(int n,int k){
	if(n<0||k<0||k>n)return 0;
	return fact[n]*invfact[n-k]%mod;
}
ll comb(int n,int k){
	if(n<0||k<0||k>n)return 0;
	return (fact[n]*invfact[n-k]%mod)*invfact[k]%mod;
}
ll powmod(ll n,ll k){
	k%=mod-1;
	if(k<0)k+=mod-1;
	ll ret=1;
	while(k){
		if(k&1)ret=ret*n%mod;
		n=n*n%mod;
		k>>=1;
	}
	return ret;
}

// Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
int main(){
    mod_build(202020);
    int n,m,k;
	cin >> n >> m >> k;
	ll pattern = comb(n*m-2, k-2)%mod;
	ll m_sum = 0;
	ll n_sum = 0;
	REP(i,1,m) {
		m_sum += (i * (m - i))%mod;
	}
	REP(i,1,n) {
		n_sum += (i * (n - i))%mod;
	}
	ll ans = pattern * ((((n*n)%mod) *m_sum)%mod + ((m*m)%mod)*n_sum)%mod);
	// cout << "debug" << endl;
	// cout << "pattern" << pattern << endl;
	// cout << "msum" << m_sum << endl;
	// cout << "nsum" << n_sum << endl;
	cout << ans%mod << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:73:78: error: expected ',' or ';' before ')' token
   73 |         ll ans = pattern * ((((n*n)%mod) *m_sum)%mod + ((m*m)%mod)*n_sum)%mod);
      |                                                                              ^
Language: C

// timeout

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

int my_combination(int n, int m, int *listK){
    // nマスのうちmマスを選択する
    int i, j, k;
    if(listK[m] == 0){
        for(i = 0; i < m; i++) listK[i] = i+1;
        listK[m]++;
        return 0;
    }else{
        for(i = m-1; (i >= 0 && i < m); i--){
            listK[i]++;
            if(listK[i] == n+1 - (m-i-1)){
                continue;
            }else{
                if(i == m-1) listK[m]++;
                if(i != m-1) listK[i+1] = listK[i];
                i+=2;
            }
        }
        if(i==m) return 0;

    }
    
    return -1;
}

int compare(const void *a, const void *b) {
  return *(int *)b - *(int *)a;
}

int main(){
    int i, j, k, l, m, n;
    int N, M, K;
    int NM;
    int *listK;
    int *xi, *yi;
    long long int cost_sum = 0;
    long long int cost = 0;
    
    scanf("%d", &N);
    scanf("%d", &M);
    scanf("%d", &K);
    
    NM = N*M;
    
    listK = (int*)malloc(sizeof(int) * (K+1));
    
    xi = (int *)malloc(sizeof(int) * NM);
    yi = (int *)malloc(sizeof(int) * NM);
    for(i = 0; i < N; i++){
        for(j = 0; j < M; j++){
            xi[i*M+j] = j+1;
            yi[i*M+j] = i+1;
        }
    }
    
    while(my_combination(NM, K, listK) != -1){
        // for(i = 0; i < K; i++) printf("%d ", listK[i]);
        cost = 0;
        for(i = 0; i < K-1; i++){
        for(j = i+1; j < K; j++){
            cost =
            abs(xi[listK[i]-1] - xi[listK[j]-1]) +
            abs(yi[listK[i]-1] - yi[listK[j]-1]);
            cost_sum += cost;
            cost_sum = cost_sum % 1000000007lld;
        }
        }
        
    }
    
    printf("%lld\n", cost_sum);

    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:70:35: error: invalid suffix "lld" on integer constant
   70 |             cost_sum = cost_sum % 1000000007lld;
      |                                   ^~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define mod 1000000007
#define fi first
#define se second
#define pb push_back
#define IOS ios_base::sync_with_stdio(false);cout.tie(NULL);cin.tie(NULL);

using namespace std;

ll power(ll a, ll n)
{
    ll ans=1;
    while(n)
    {
        if(n%2) ans=(ans*a)%mod;
        a=(a*a)%mod;
        n>>=1;
    }
    return ans;
}

int main()
{
    IOS;
    ll n,m,k;
    cin>>n>>m>>k;
    ll ans=0;
    ll fac[300001];
    fac[0]=1;
    for(int i=1;i<300001;i++)
    {
        fac[i]=(fac[i-1]*i)%mod;
    }
    ll num=fac[n*m-2];
    ll den=(fac[n*m-k]*fac[k-2])%mod;
    ll val=(num*power(den,mod-2))%mod;
    //cout<<num<<" "<<den<<" "<<val<<endl;
    for(int i=1;i<n;i++)
    {
        ans=(ans+((i*(n-i))%mod*(m*m)%mod)%mod)
    }
    for(int i=1;i<m;i++)
    {
        ans=(ans+((i*(m-i))%mod*(n*n)%mod)%mod);
    }
    ans=(ans*val)%mod;
    cout<<ans<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:42:48: error: expected ';' before '}' token
   42 |         ans=(ans+((i*(n-i))%mod*(m*m)%mod)%mod)
      |                                                ^
      |                                                ;
   43 |     }
      |     ~
Language: C++

from collections import deque
from heapq import heappush,heappop
import re

def int_raw():
    return int(input())

def ss_raw():
    return input().split()

def ints_raw():
    return list(map(int, ss_raw()))

INF = 1<<29

DIV = 10**9+7

def mod_inv(a,mod = DIV):
    return pow(a,mod-2,mod)

def ncr(n,r, mod =DIV):
	r = min(r,n-r)
	ret = 1
	for i in range(1,r+1):
		ret = ret * (n-i+1) % mod
		ret = ret * pow(i, mod-2, mod) % mod
	return ret


def main():
    N, M,K = ints_raw()
    ans = 0
    for d in range(1,N):
        ans =(ans+d*(N-d)*M*M)%DIV
    for d in range(1,M):
        ans =(ans+d*(M-d)*N*N)%DIV
    return (ans*ncr(N*M-2,K-2))%DIV
print(main())


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

#include<algorithm>
#include<string>
#include<cctype>
#include<iomanip>
#include<vector>
#include<queue>
#include<tuple>
#include<stdio.h>
#include<set>
 
using namespace std;
#define REP(i,b,e) for(ll i=(ll)b;i<(ll)e;i++)
#define rep0(i,n) REP(i,0ll,n)
#define rep1(i,n) REP(i,1ll,n+1)
 
#define shosu setprecision(10)
typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<P,ll> Q;
typedef pair<Q,ll> R;
ll longinf=1ll<<60;
int inf=1<<29;
//mleしなければぜんぶllでかく。
//↑はあんまり気にしなくていい。
const ll MOD = 1e9+7;
const int index = 2*1e5+1;
 
ll add(ll a,ll b){
      return ((a%MOD)+(b%MOD))%MOD;
}
 
ll mul(ll a,ll b){
      return ((a%MOD)*(b%MOD))%MOD;
}
 
ll power(ll a,ll b){
      if(b==0) return 1;
      else if(b%2==0){
            ll ret=power(a,b/2);
            return ((ret%MOD)*(ret%MOD))%MOD;
      }
      else return ((power(a,b-1)%MOD)*(a%MOD))%MOD;
}
ll dive(ll a,ll b){
      return ((a%MOD)*(power(b,MOD-2)%MOD))%MOD;
}
 
ll frac[index+1];
void calc(){ //main関数内にcalc();を入れること
      frac[0]=1;
      rep0(i,index){
            frac[i+1]=mul(frac[i],i+1);
      }
}
 
int main(){
      int n,m,k;
      cin>>n>>m>>k;
      ll ans=0;
      calc();
      rep0(i,n){
            ans+=mul( mul(mul(m,m),mul(i,n-i)) , dive( frac[m*n-2] , mul(frac[m*n-k],frac[k-2]) ) );
            ans%=MOD;
      }
     // swap(n,m);
      rep0(i,m){
            ans+=mul( mul(mul(m,m),mul(i,n-i)) , dive( frac[m*n-2] , mul(frac[m*n-k],frac[k-2]) ) );
            ans%=MOD;
      }
      cout<<ans<<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:58:7: error: 'cin' was not declared in this scope
   58 |       cin>>n>>m>>k;
      |       ^~~
a.cc:10:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    9 | #include<set>
  +++ |+#include <iostream>
   10 | 
a.cc:70:7: error: 'cout' was not declared in this scope
   70 |       cout<<ans<<endl;
      |       ^~~~
a.cc:70:7: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include<algorithm>
#include<string>
#include<cctype>
#include<iomanip>
#include<vector>
#include<queue>
#include<tuple>
#include<stdio.h>
#include<set>
 
using namespace std;
#define REP(i,b,e) for(ll i=(ll)b;i<(ll)e;i++)
#define rep0(i,n) REP(i,0ll,n)
#define rep1(i,n) REP(i,1ll,n+1)
 
#define shosu setprecision(10)
typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<P,ll> Q;
typedef pair<Q,ll> R;
ll longinf=1ll<<60;
int inf=1<<29;
//mleしなければぜんぶllでかく。
//↑はあんまり気にしなくていい。
const ll MOD = 1e9+7;
const int index = 2*1e5+1;
 
ll add(ll a,ll b){
      return ((a%MOD)+(b%MOD))%MOD;
}
 
ll mul(ll a,ll b){
      return ((a%MOD)*(b%MOD))%MOD;
}
 
ll power(ll a,ll b){
      if(b==0) return 1;
      else if(b%2==0){
            ll ret=power(a,b/2);
            return ((ret%MOD)*(ret%MOD))%MOD;
      }
      else return ((power(a,b-1)%MOD)*(a%MOD))%MOD;
}
ll dive(ll a,ll b){
      return ((a%MOD)*(power(b,MOD-2)%MOD))%MOD;
}
 
ll frac[index+1];
void calc(){ //main関数内にcalc();を入れること
      frac[0]=1;
      rep0(i,index){
            frac[i+1]=mul(frac[i],i+1);
      }
}
 
int main(){
      int n,m,k;
      cin>>n>>m>>k;
      ll ans=0;
      calc();
      rep0(i,n){
            ans+=mul( mul(mul(m,m),mul(i,n-i)) , dive( frac[m*n-2] , mul(frac[m*n-k],frac[k-2]) ) );
            ans%=MOD;
      }
      //swap(n,m);
      rep0(i,m){
            ans+=mul( mul(mul(m,m),mul(i,n-i)) , dive( frac[m*n-2] , mul(frac[m*n-k],frac[k-2]) ) );
            ans%=MOD;
      }
      cout<<ans<<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:58:7: error: 'cin' was not declared in this scope
   58 |       cin>>n>>m>>k;
      |       ^~~
a.cc:10:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    9 | #include<set>
  +++ |+#include <iostream>
   10 | 
a.cc:70:7: error: 'cout' was not declared in this scope
   70 |       cout<<ans<<endl;
      |       ^~~~
a.cc:70:7: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(ll i = 0; i < (ll)n; i++)
#define FOR(i, a, b) for(ll i = (a); i < (ll)b; i++)
#define ALL(obj) (obj).begin(), (obj).end()
#define INF 1000000000000000
using namespace std;
typedef long long ll;
typedef double db;
typedef string str;
typedef pair<ll, ll> p;
constexpr int MOD = 1000000007;
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;
}

void print(const std::vector<int> &v) {
    std::for_each(v.begin(), v.end(), [](int x) { std::cout << x << " "; });
    std::cout << std::endl;
}

ll modpow(ll a, ll p) {
    if(p == 0)
        return 1;
    if(p % 2 == 0) {
        ll halfp = p / 2;
        ll half = modpow(a, halfp);
        return half * half % MOD;
    } else {
        return a * modpow(a, p - 1) % MOD;
    }
}

ll calcComb(ll a, ll b) {
    if(b > a - b) {
        return calcComb(a, a - b);
    }
    ll ansMul = 1;
    ll ansDiv = 1;
    REP(i, b) {
        ansMul *= (a - i);
        ansDiv *= (i + 1);
        ansMul %= MOD;
        ansDiv %= MOD;
    }
    ll ans = ansMul * modpow(ansDiv, MOD - 2);
    ans %= MOD;
    return ans;
}

int N, M, K;
long long ans = 0;
vector<pair<int, int>> v;
int main() {
    cin >> N >> M >> K;
    ll ans = 0;
    REP(i, N) {
        REP(j, K) {
            for(int k = i; k < N; k++) {
                if(k == i) {
                    for(int l = j + 1; l < K; l++) {
                        ans += abs(k - i);
                        ans += abs(l - j);
                        ans %= MOD;
                    }

                } else {
                    REP(k, K) {
                        ans += abs(k - i);
                        ans += abs(l - j);
                        ans %= MOD;
                    }
                }
            }
        }
    }
    ans *= calcComb(N * M - 2, K - 2);
    ans %= MOD;
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:80:36: error: 'l' was not declared in this scope
   80 |                         ans += abs(l - j);
      |                                    ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pi;

typedef int ll;

const ll INF = 1LL << 60;
const ll MOD = 1e9 + 7;

#define pb push_back
#define mp make_pair
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define REP2(i, b, e) for (int i = (b); i <= (int)(e); i++)
#define DEBUG(x) cout << #x << ": " << (x) << endl
#define DEBUGA(a) cout << #a << ": "; for (const auto& v: (a)) cout << v << endl

// 階乗, 逆元テーブル(mod)
const int nMax = 200005;
ll fact[nMax], fact_inv[nMax], inv[nMax];
ll calc_fact() {
    fact[0] = fact[1] = 1;
    fact_inv[0] = fact_inv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < nMax; i++) {
        fact[i] = fact[i-1] * i % MOD;
        inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
        fact_inv[i] = fact_inv[i - 1] * inv[i] % MOD;
    }
}

// 組合せ, 二項係数
ll mod_comb(ll n, ll r) {
    if (r < 0 || n < r) return 0;
    return ((fact[n] * fact_inv[r]) % MOD) * fact_inv[n - r] % MOD;
}

int main() {
    int N, M, K;
    cin >> N >> M >> K;

    calc_fact();

    ll sumx = 0, sumy = 0;
    ll comb = mod_comb(N * M - 2, K - 2);

    REP(i, N) sumx = (sumx + i * (N - i) % MOD) % MOD;
    sumx = sumx * M * M % MOD;
    REP(j, M) sumy = (sumy + j * (M - j) % MOD) % MOD;
    sumy = sumy * N * N % MOD;

    ll ans = comb * (sumx + sumy) % MOD;
    cout << ans << endl;

    return 0;
}


Compiler output:
a.cc:7:13: error: conflicting declaration 'typedef int ll'
    7 | typedef int ll;
      |             ^~
a.cc:3:19: note: previous declaration as 'typedef long long int ll'
    3 | typedef long long ll;
      |                   ^~
a.cc: In function 'll calc_fact()':
a.cc:31:1: warning: no return statement in function returning non-void [-Wreturn-type]
   31 | }
      | ^
Language: C++

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

using ll = long long;
const ll MOD = ll(1e9)+7;

ll modinv(ll a, ll m) {
  return a == 1 ? 1 : m - modinv(m % a, a) * m / a;
}

ll choose(ll n, ll r) {
  r = min(r, n - r);
  if (r < 0) return 0;
  ll num = 1, den = 1;
  for (int i = 0; i < r; i++) {
    num *= (n - i), num %= mod;
    den *= i+1, den %= mod;
  }
  return num * modinv(den, mod) % mod;
}

int main() {
  ll N, M, K; cin >> N >> M >> K;
  ll res = (M + N) % mod * M % mod * N % mod * ((M * N - 1) % mod) % mod;
  res *= modinv(6, mod), res %= mod;
  res *= choose(N * M - 2, K), res %= mod;
  cout << res << '\n';
}

Compiler output:
a.cc: In function 'll choose(ll, ll)':
a.cc:16:28: error: 'mod' was not declared in this scope; did you mean 'modf'?
   16 |     num *= (n - i), num %= mod;
      |                            ^~~
      |                            modf
a.cc:19:28: error: 'mod' was not declared in this scope; did you mean 'modf'?
   19 |   return num * modinv(den, mod) % mod;
      |                            ^~~
      |                            modf
a.cc: In function 'int main()':
a.cc:24:22: error: 'mod' was not declared in this scope; did you mean 'modf'?
   24 |   ll res = (M + N) % mod * M % mod * N % mod * ((M * N - 1) % mod) % mod;
      |                      ^~~
      |                      modf
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
#define	N	1000000007
 
int main()
{
	long long n, m, k,cost=0,t=1;
	cin >> n >> m >> k;
	for (long long i = 0; i < n; i++) cost = (cost + (1 + i) * i / 2 * m % MOD * m % MOD) % MOD;
	for (long long i = 0; i < m; i++) cost = (cost + (1 + i) * i / 2 * n % MOD * n % MOD) % MOD;
	for (long long i = 2; i <= n * m - 2; i++) cost = cost * i % N;
	for (long long i = 2; i <= k - 2; i++) t = t * i % N;
	for (long long i = 2; i <= (n * m - k); i++) t = t * i % N;
	for (long long x = N - 2; x > 0; t = t * t % N, x >>= 1)
		if (x & 1) cost = cost * t % N;
	cout << cost << endl;
 
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:80: error: 'MOD' was not declared in this scope
   11 |         for (long long i = 0; i < n; i++) cost = (cost + (1 + i) * i / 2 * m % MOD * m % MOD) % MOD;
      |                                                                                ^~~
a.cc:12:80: error: 'MOD' was not declared in this scope
   12 |         for (long long i = 0; i < m; i++) cost = (cost + (1 + i) * i / 2 * n % MOD * n % MOD) % MOD;
      |                                                                                ^~~
Language: C++

#include <iostream>
using namespace std;

typedef long long ll;

ll inf = 1e9+7;
int N,M,K;
ll X[200010],Y[200010];

int main(){
    cin >> N >> M >> K;
    ll ans = 0;
    for(ll i=1;i<=N-1;i++){
        ll num = N-i;
        (ans += num*i%inf*M%inf*M%inf)%=inf;
    }
    for(ll i=1;i<=M-1;i++){
        ll num = M-i;
        (ans += num*i%inf*N%inf*N%inf)%=inf;
    }
    for(ll i=1;i<=K-2;i++){
        (ans *= (M*N-2)-(i-1))%=inf;
        (ans *= mult(i,inf-2))%=inf;
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:17: error: 'mult' was not declared in this scope
   23 |         (ans *= mult(i,inf-2))%=inf;
      |                 ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> V;
const long long MOD=1000000007LL;
const long long INFL=1LL << 60;
const int INF=1<<29;

const int MAX = 210000;

long long fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

// 二項係数計算
long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}


int main(){
    COMinit();
    int N,M,K;
    cin >>N>>M>>K;
    ll ans=0; 
    for(int i=1;i<N;i++){
        ans+=i*M%MOD*M*%MOD*(N-i)%MOD;
    }
    for(int j=1;j<M;j++){
        ans+=j*N%MOD*N*%MOD*(M-j)%MOD;
    }
    ans=ans*COM(N*M-2,K-2)%MOD;
    cout<<ans<<endl;



    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:40:24: error: expected primary-expression before '%' token
   40 |         ans+=i*M%MOD*M*%MOD*(N-i)%MOD;
      |                        ^
a.cc:43:24: error: expected primary-expression before '%' token
   43 |         ans+=j*N%MOD*N*%MOD*(M-j)%MOD;
      |                        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> V;
const long long MOD=1000000007LL;
const long long INFL=1LL << 60;
const int INF=1<<29;

const int MAX = 210000;

long long fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

// 二項係数計算
long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}


int main(){
    COMinit();
    int N,M,K;
    cin >>N>>M>>K;
    ll ans=0; 
    for(int i=1;i<N;i++){
        ans+=i*M%MOD*M*%MOD(N-i)%MOD;
    }
    for(int j=1;j<M;j++){
        ans+=j*N%MOD*N*%MOD(M-j)%MOD;
    }
    ans=ans*COM(N*M-2,K-2)%MOD;
    cout<<ans<<endl;



    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:40:24: error: expected primary-expression before '%' token
   40 |         ans+=i*M%MOD*M*%MOD(N-i)%MOD;
      |                        ^
a.cc:40:28: error: 'MOD' cannot be used as a function
   40 |         ans+=i*M%MOD*M*%MOD(N-i)%MOD;
      |                         ~~~^~~~~
a.cc:43:24: error: expected primary-expression before '%' token
   43 |         ans+=j*N%MOD*N*%MOD(M-j)%MOD;
      |                        ^
a.cc:43:28: error: 'MOD' cannot be used as a function
   43 |         ans+=j*N%MOD*N*%MOD(M-j)%MOD;
      |                         ~~~^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod = 1000000007;
long long N,M,K;

vector<ll> fac(300001),ifac(300001); //n!(mod M),k!^{M-2} (mod M)
//a,bの範囲的にこれだけ配列を用意していけば十分

ll mpow(ll x, ll n){ //x^n(mod M) ←普通にpow(x,n)では溢れてしまうため，随時mod計算
    ll ans = 1;
    while(n != 0){
        if(n&1) ans = ans*x % mod;
        x = x*x % mod;   n = n >> 1;
    }
    return ans;
}

ll comb(ll a, ll b){ //aCbをmod計算
    if(a == 0 && b == 0)return 1;
    if(a < b || a < 0)return 0;
    ll tmp = ifac[a-b]* ifac[b] % mod;
    return tmp * fac[a] % mod;
}

int main()
{
    cin >> N >> M >> K;
    //大した量ではないので，先にfax[i]とifax[i]を全て計算しておく
    fac[0] = 1; ifac[0] = 1;
    for(ll i = 0; i<300000; i++){
        fac[i+1] = fac[i]*(i+1) % mod; // n!(mod M)
        ifac[i+1] = ifac[i]*mpow(i+1, mod-2) % mod;//k!^{M-2} (mod M) ←累乗にmpowを採用
    }
    ll co=comb(N*M,K)%mod;
    //cout << co << endl;
  cout << co*K*(K-1)/2%mod*((N-1+M-1)+2*K)/(K+1)%mod << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:37:62: error: expected '}' at end of input
   37 |   cout << co*K*(K-1)/2%mod*((N-1+M-1)+2*K)/(K+1)%mod << endl;
      |                                                              ^
a.cc:27:1: note: to match this '{'
   27 | {
      | ^
Language: Java

import java.util.Scanner;
import java.lang.Math;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long N,M,K,i,j;
    long s = 0;
    N = sc.nextLong();
    M = sc.nextLong();
    K = sc.nextLong();
    long[][] a = new long[N][M];
    for(i=1;i<=K-1;i++){
      for(j=i+1;j<=K;j++){
        s+=Math.abs(a[i][i]-a[j][j]);
      }
    }
    System.out.println(s);
  }
}

Compiler output:
Main.java:11: error: incompatible types: possible lossy conversion from long to int
    long[][] a = new long[N][M];
                          ^
Main.java:11: error: incompatible types: possible lossy conversion from long to int
    long[][] a = new long[N][M];
                             ^
Main.java:14: error: incompatible types: possible lossy conversion from long to int
        s+=Math.abs(a[i][i]-a[j][j]);
                      ^
Main.java:14: error: incompatible types: possible lossy conversion from long to int
        s+=Math.abs(a[i][i]-a[j][j]);
                         ^
Main.java:14: error: incompatible types: possible lossy conversion from long to int
        s+=Math.abs(a[i][i]-a[j][j]);
                              ^
Main.java:14: error: incompatible types: possible lossy conversion from long to int
        s+=Math.abs(a[i][i]-a[j][j]);
                                 ^
6 errors
Language: C++

#include<iostream>

int main()
{
   long i,j,n,m,k,r=0;
  cin>>n>m>>k;
   int a[n][m];
  
   for(i=0;i<n;i++)
   {
      for(j=0;j<m;j++)
      {
         r+=(i-j)+(i+1-j+1);
      }
   }
  cout<<r;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>n>m>>k;
      |   ^~~
      |   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:16:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |   cout<<r;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~