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

//
//  main.cpp
//  ABC167E
#include <iostream>
#include <vector>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;
// auto mod int
// https://youtu.be/L8grWxBlIZ4?t=9858
// https://youtu.be/ERZuLAxZffQ?t=4807 : optimize
// https://youtu.be/8uowVvQ_-Mo?t=1329 : division
//const int mod = 1000000007;
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
//istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}

// Combination
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}c(200005); // ←これを追記する
// 使い方
// nCxなら c(n,x) とする
int main(int argc, const char * argv[]) {
    int n,m,k;
    cin >> n >> m >> k;
    mint ans=0;
    mint col=m;
    mint combi=0;
    for(int x=n-1;x>=0;--x){ // xはグループ数
        mint now=col;
        combi=c(n-1,x); // combination
        now *= combi;
        if (x <= k) {
            ans+=now;
        }
        col *= m-1;
    }
    cout<<ans<<endl;
    return 0;
}


Compiler output:
a.cc: In constructor 'combination::combination(int)':
a.cc:52:5: error: 'assert' was not declared in this scope
   52 |     assert(n < mod);
      |     ^~~~~~
a.cc:6:1: note: 'assert' is defined in header '<cassert>'; this is probably fixable by adding '#include <cassert>'
    5 | #include <vector>
  +++ |+#include <cassert>
    6 | #define rep(i,n) for (int i = 0; i < (n); ++i)
Language: C++

//
//  main.cpp
//  ABC167E
#include <iostream>
#include <vector>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;
// auto mod int
// https://youtu.be/L8grWxBlIZ4?t=9858
// https://youtu.be/ERZuLAxZffQ?t=4807 : optimize
// https://youtu.be/8uowVvQ_-Mo?t=1329 : division
//const int mod = 1000000007;
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}

// Combination
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}c(200005); // ←これを追記する
// 使い方
// nCxなら c(n,x) とする
int main(int argc, const char * argv[]) {
    int n,m,k;
    cin >> n >> m >> k;
    mint ans=0;
    mint col=m;
    mint combi=0;
    for(int x=n-1;x>=0;--x){ // xはグループ数
        mint now=col;
        combi=c(n-1,x); // combination
        now *= combi;
        if (x <= k) {
            ans+=now;
        }
        col *= m-1;
    }
    cout<<ans<<endl;
    return 0;
}


Compiler output:
a.cc: In constructor 'combination::combination(int)':
a.cc:52:5: error: 'assert' was not declared in this scope
   52 |     assert(n < mod);
      |     ^~~~~~
a.cc:6:1: note: 'assert' is defined in header '<cassert>'; this is probably fixable by adding '#include <cassert>'
    5 | #include <vector>
  +++ |+#include <cassert>
    6 | #define rep(i,n) for (int i = 0; i < (n); ++i)
Language: C

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


ll nck(ll n, ll k){
    
    ll p=998244353;
    ll p2;
    p2=p-2;
    vector <int> r(35);
    vector <ll> r2(36);

    rep(j,35){
        r[j]=(p2>>j)&1;
    }

    ll ans;
    ans=1;

    if (k!=0){
    rep(i,k-1){   
        r2[0]=i+2;
        rep(j,35){
           
            r2[j+1]=(r2[j]*r2[j])%p;
            if(r[j]==1){
            ans*=r2[j];
            ans=ans%p;
            }
        }
    }
    rep(i,k){
        ans*=n-i;
        ans=ans%p;
    }
    }
    return ans;
}

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

vector <int> bi(35,0),b2(35,0),b0(35,0);

ll ans,x;
ll xb; //xb^(2^0)*xb^(2^1)*..
xb=m;
ll p=998244353;
ll xans=1;
ans=0;

xb=m-1;
rep(i,19){
            b2[i]=xb;
            xb=(xb*xb)%p;
        }

x=n-k-1;
rep(i,19){
            bi[i]=(x>>i)&1;
            if(bi[i]==1){
                xans*=b2[i];
                xans=xans%p;
            }
        }
ll nck2=nck(n-1,k);

ll xans2;
for(int i=k; i>-1 ; --i){
    //cout << i << endl;
    if(i!=k){
        xans*=(m-1);
        nck2=nck2*(i+1);
        while(nck2%(n-i-1)!=0){
            nck2+=p;
    }
    nck2/=n-i-1;
    nck2=nck2%p;
    }
        
        xans=xans%p;
        xans2=xans*nck2;
        //cout << xans << endl;
        xans2=xans2%p;
        ans+=xans2*m;
        ans=ans%p;


}

cout << ans << endl;





    

    return 0;
}

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

#include<iostream>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<algorithm>
#include<cmath>
#include<string>
using namespace std;
#define ms(x,y) memset(x, y, sizeof(x))
#define lowbit(x) ((x)&(-x))
#define sqr(x) ((x)*(x))
typedef long long LL;
typedef pair<int,int> pii;
typedef pair<LL,LL> pll;
#define endl "\n";


const int maxn = 2e5+5;
const int MOD = 998244353;
LL F[maxn], inv[maxn], Finv[maxn];

void init() {
    inv[1] = 1;
    for(int i = 2; i < maxn; ++i) {
        inv[i] = (MOD - MOD / i) * 1LL * inv[MOD % i] % MOD; 
    }
    F[0] = Finv[0] = 1;
    for(int i = 1; i < maxn; i ++){
        F[i] = F[i-1] * 1LL * i % MOD;
        Finv[i] = Finv[i-1] * 1LL * inv[i] % MOD;
    }
}

LL comb(int n, int m){   //comb(n, m) C(n, m) 
    if(m < 0 || m > n) return 0;
    return F[n] * 1LL * Finv[n - m] % MOD * Finv[m] % MOD;
}

LL pow(LL a, LL b) {
    LL ret = 1;
    while(b) {
        if(b&1) ret = 1LL*ret*a%MOD;
        a = 1LL*a*a%MOD;
        b >>= 1;
    }
    return ret;
}

void run_case() {
    int n, m, k;
    cin >> n >> m >> k;
    init();
    LL ans = 0;
    for(int i = 0; i <= k; ++i) {
        LL tmp = 1LL*m*comb(n-1,i)%MOD*pow(m-1, n-1-k)%MOD;
        ans = (ans + tmp) % MOD;
    }
    cout << ans;
}


int main() {
    ios::sync_with_stdio(false), cin.tie(0);
    cout.flags(ios::fixed);cout.precision(9);
    //int t; cin >> t;
    //while(t--)
    run_case();
    cout.flush();
    return 0;
}

Compiler output:
a.cc: In function 'void run_case()':
a.cc:56:55: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'const int' to binary 'operator%'
   56 |         LL tmp = 1LL*m*comb(n-1,i)%MOD*pow(m-1, n-1-k)%MOD;
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
      |                                       |                |
      |                                       |                const int
      |                                       __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<iostream>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<algorithm>
#include<cmath>
#include<string>
using namespace std;
#define ms(x,y) memset(x, y, sizeof(x))
#define lowbit(x) ((x)&(-x))
#define sqr(x) ((x)*(x))
typedef long long LL;
typedef pair<int,int> pii;
typedef pair<LL,LL> pll;
#define endl "\n";
#define int long long

const int maxn = 2e5+5;
const int MOD = 998244353;
int F[maxn], inv[maxn], Finv[maxn];

void init() {
    inv[1] = 1;
    for(int i = 2; i < maxn; ++i) {
        inv[i] = (MOD - MOD / i) * 1ll * inv[MOD % i] % MOD; 
    }
    F[0] = Finv[0] = 1;
    for(int i = 1; i < maxn; i ++){
        F[i] = F[i-1] * 1ll * i % MOD;
        Finv[i] = Finv[i-1] * 1ll * inv[i] % MOD;
    }
}

int comb(int n, int m){   //comb(n, m) C(n, m) 
    if(m < 0 || m > n) return 0;
    return F[n] * 1ll * Finv[n - m] % MOD * Finv[m] % MOD;
}

int pow(int a, int b) {
    int ret = 1;
    while(b) {
        if(b&1) ret = 1LL*ret*a%MOD;
        a = 1LL*a*a%MOD;
        b >>= 1;
    }
    return ret;
}

void run_case() {
    int n, m, k;
    cin >> n >> m >> k;
    init();
    LL ans = 0;
    for(int i = 0; i <= k; ++i) {
        LL tmp = 1LL*m*comb(n-1,i)*pow(m-1, n-1-k);
        ans = (ans + tmp) % MOD;
    }
    cout << ans;
}


int main() {
    ios::sync_with_stdio(false), cin.tie(0);
    cout.flags(ios::fixed);cout.precision(9);
    //int t; cin >> t;
    //while(t--)
    run_case();
    cout.flush();
    return 0;
}

Compiler output:
cc1plus: error: '::main' must return 'int'
Language: C++

#include <bits/stdc++.h>

#define rep(i, N) for (ll i = 0; i < N; i++)
#define rep1(i, N) for (ll i = 1; i <= N; i++)
#define repr(i, N) for (ll i = N-1; i >= 0; i--)
#define repr1(i, N) for (ll i = N; i > 0; i--)

#define MOD 998244353

using ll = long long;
using namespace std;


/*nCk (mod MOD)の計算 BEGIN*/
//faccal -> n!, k!^(MOD-2)の計算(初期化)
//comb -> nCk (mod MOD)の計算
ll mlpow(ll x, ll p) { //x^p(long long)%MOD
    ll tmp = 1;
    if(p == 0) return 1;
    while(p != 0) {
        if(p & 1) tmp = tmp*x % MOD;
        x = x*x % MOD;
        p = p >> 1;
    }
    return tmp;
}

int facnum = 200005;
vl fac(facnum);   //n!
vl facM2(facnum);  //k!^(MOD-2)

void faccal(ll up) {
    fac[0] = 1;
    facM2[0] = 1;
    for(ll i = 0; i<up+1; i++){
        fac[i+1] = fac[i]*(i+1) % MOD; // n!(mod M)
        facM2[i+1] = facM2[i]*mlpow(i+1, MOD-2) % MOD; // k!^{M-2} (mod M) ←累乗にmpowを採用
    }
}

ll comb(ll n, ll k) {
    if(n == 0 && k == 0) return 1;
    if(n < k || n < 0) return 0;
    ll tmp = facM2[n-k]*facM2[k] % MOD;
    return tmp*fac[n] % MOD;  //nCk = n!*(k!)^(M-2)*((n-k)!)^(M-2)
}
/*nCk (mod MOD)の計算 END*/

int main() {
    int N, M, K;
    ll ans = 0;
    cin >> N >> M >> K;

    faccal(N);

    rep(i,K+1){
        ll tmpM1 = mlpow(M-1, N-1-i);
        ll tmpM = M;
        tmpM = tmpM*tmpM1%MOD;
        tmpM = tmpM*comb(N-1, i)%MOD;
        ans = (ans+tmpM)%MOD;

    }

    cout << ans << "\n";
    return 0;
}


Compiler output:
a.cc:29:1: error: 'vl' does not name a type; did you mean 'll'?
   29 | vl fac(facnum);   //n!
      | ^~
      | ll
a.cc:30:1: error: 'vl' does not name a type; did you mean 'll'?
   30 | vl facM2(facnum);  //k!^(MOD-2)
      | ^~
      | ll
a.cc: In function 'void faccal(ll)':
a.cc:33:5: error: 'fac' was not declared in this scope
   33 |     fac[0] = 1;
      |     ^~~
a.cc:34:5: error: 'facM2' was not declared in this scope
   34 |     facM2[0] = 1;
      |     ^~~~~
a.cc: In function 'll comb(ll, ll)':
a.cc:44:14: error: 'facM2' was not declared in this scope
   44 |     ll tmp = facM2[n-k]*facM2[k] % MOD;
      |              ^~~~~
a.cc:45:16: error: 'fac' was not declared in this scope
   45 |     return tmp*fac[n] % MOD;  //nCk = n!*(k!)^(M-2)*((n-k)!)^(M-2)
      |                ^~~
Language: Java

import java.util.*;
public class Main {
  	private static final int MAX = 510000;
	private static long[] fac = new long[MAX];
	private static long[] inv = new long[MAX];
	private static long[] finv = new long[MAX];
	private static final int constant = 998244353;
  
  	public Main() {
    	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 % constant;
			inv[i] = constant - inv[constant%i] * (constant / i) % constant;
			finv[i] = finv[i - 1] * inv[i] % constant;
		}
    }
  
    public static void main(String[] args){
		Scanner s = new Scanner(System.in);
		int N = s.nextInt();
		int M = s.nextInt();
		int K = s.nextInt();

		final LongBinaryOperator pow = (i, j) -> {
			long result = 1;
			while(j > 0) {
				if((j & 1) == 1)
					result = (result * i) % constant;
				i = (i  * i) % constant;
				j >>= 1;
			}
			return result;
		};

		final IntUnaryOperator function = i -> {
			return (int)(M * getNewCom(N - 1, i) % constant * pow.applyAsLong(M-1, N-i-1) % constant);
		};
		
		long result = 0;
		for(int i = 0; i < K + 1; i++) {
			result = (result + function.applyAsInt(i)) % constant;
		}

		System.out.println(result);
    }
  
  	private static long getNewCom(int n, int k) {
		if( n < k) return 0;
		if (n < 0 || k < 0) return 0;
		return fac[n] * (finv[k] * finv[n - k] % constant) % constant;
	}
}

Compiler output:
Main.java:26: error: cannot find symbol
		final LongBinaryOperator pow = (i, j) -> {
		      ^
  symbol:   class LongBinaryOperator
  location: class Main
Main.java:37: error: cannot find symbol
		final IntUnaryOperator function = i -> {
		      ^
  symbol:   class IntUnaryOperator
  location: class Main
2 errors
Language: C++

#include <algorithm>
#include <cstdio>
#include <vector>

using namespace std;
using ll = long long;

const int Mo = 998244353;
vector<ll> fac, ifac;

ll qpow(ll b, ll p) {
  ll res = 1;
  while (p > 0) {
    if (p & 1) res = res * b % Mo;
    b = b * b % Mo;
    p >>= 1;
  }
  return res;
}

ll comb(ll m, ll n) {
  return ((ifac[m] * fac[n]) % Mo * ifac[n - m]) % Mo
}

int main() {
  int n, m, k;
  ll res = 0;
  scanf("%d%d%d", &n, &m, &k);

  fac = vector<ll>(n + 1);
  ifac = vector<ll>(n + 1);
  fac[0] = ifac[0] = 1;
  for (ll i = 1; i <= n; ++i) {
    fac[i] = fac[i - 1] * i % Mo;
    ifac[i] = qpow(fac[i], Mo - 2);
  }

  ll t = qpow(m - 1, n - k - 1) * m % Mo;
  for (int i = 1; i <= k; ++i) {
    res += t * comb(n - 1, 1);
    res %= Mo;
    t = t * (m - 1) % Mo;
  }

  printf("%lld\n", res);
  return 0;
}


Compiler output:
a.cc: In function 'll comb(ll, ll)':
a.cc:22:54: error: expected ';' before '}' token
   22 |   return ((ifac[m] * fac[n]) % Mo * ifac[n - m]) % Mo
      |                                                      ^
      |                                                      ;
   23 | }
      | ~
Language: C++

#include <algorithm>
#include <cstdio>
#include <vector>

const int Mo = 998244353;
vector<ll> fac, ifac;

ll qpow(ll b, ll p) {
  ll res = 1;
  while (p > 0) {
    if (p & 1) res = res * b % Mo;
    b = b * b % Mo;
    p >>= 1;
  }
  return res;
}

ll comb(ll m, ll n) {
  return ((ifac[m] * fac[n]) % Mo * ifac[n - m]) % Mo
}

int main() {
  int n, m, k;
  ll res = 0;
  scanf("%d%d%d", &n, &m, &k);

  fac = vector<ll>(n + 1);
  ifac = vector<ll>(n + 1);
  fac[0] = ifac[0] = 1;
  for (ll i = 1; i <= n; ++i) {
    fac[i] = fac[i - 1] * i % Mo;
    ifac[i] = qpow(fac[i], Mo - 2);
  }

  ll t = qpow(m - 1, n - k - 1) * m % Mo;
  for (int i = 1; i <= k; ++i) {
    res += t * comb(n - 1, 1);
    res %= Mo;
    t = t * (m - 1) % Mo;
  }

  printf("%lld\n", res);
  return 0;
}


Compiler output:
a.cc:6:1: error: 'vector' does not name a type
    6 | vector<ll> fac, ifac;
      | ^~~~~~
a.cc:8:1: error: 'll' does not name a type
    8 | ll qpow(ll b, ll p) {
      | ^~
a.cc:18:1: error: 'll' does not name a type
   18 | ll comb(ll m, ll n) {
      | ^~
a.cc: In function 'int main()':
a.cc:24:3: error: 'll' was not declared in this scope
   24 |   ll res = 0;
      |   ^~
a.cc:27:3: error: 'fac' was not declared in this scope
   27 |   fac = vector<ll>(n + 1);
      |   ^~~
a.cc:27:9: error: 'vector' was not declared in this scope
   27 |   fac = vector<ll>(n + 1);
      |         ^~~~~~
a.cc:27:9: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:28:3: error: 'ifac' was not declared in this scope
   28 |   ifac = vector<ll>(n + 1);
      |   ^~~~
a.cc:30:10: error: expected ';' before 'i'
   30 |   for (ll i = 1; i <= n; ++i) {
      |          ^~
      |          ;
a.cc:30:18: error: 'i' was not declared in this scope
   30 |   for (ll i = 1; i <= n; ++i) {
      |                  ^
a.cc:32:15: error: 'qpow' was not declared in this scope
   32 |     ifac[i] = qpow(fac[i], Mo - 2);
      |               ^~~~
a.cc:35:5: error: expected ';' before 't'
   35 |   ll t = qpow(m - 1, n - k - 1) * m % Mo;
      |     ^~
      |     ;
a.cc:37:5: error: 'res' was not declared in this scope
   37 |     res += t * comb(n - 1, 1);
      |     ^~~
a.cc:37:12: error: 't' was not declared in this scope
   37 |     res += t * comb(n - 1, 1);
      |            ^
a.cc:37:16: error: 'comb' was not declared in this scope; did you mean 'wctomb'?
   37 |     res += t * comb(n - 1, 1);
      |                ^~~~
      |                wctomb
a.cc:42:20: error: 'res' was not declared in this scope
   42 |   printf("%lld\n", res);
      |                    ^~~
Language: C++

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


vector<ll> fac(300001);
vector<ll> ifac(300001);

ll mod_pow(ll n,ll k,ll mod){
    if(k==0) return 1;
    if(k%2==0){
        int mp=mod_pow(n,k/2,mod);
        return (mp*mp)%mod;
    }
    if(k%2==1) return (mod_pow(n,k-1,mod)*(n%mod))%mod;
    return;//ここにはこないはず
}


ll mod_c(ll a,ll b,ll mod){
    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(){
    const ll mod=998244353;
    ll n,m,k;
    ll ans=0;
    cin>>n>>m>>k;

    fac[0]=1;
    ifac[0]=1;

    for (ll i=0;i<300000;i++){
        fac[i+1]=fac[i]*(i+1)%mod;
        ifac[i+1]=ifac[i]*mod_pow(i+1,mod-2,mod)%mod;//(i+1)!^-1 =(i+1)!^(M-2)=(i+1)^(M-2) * (i!)^(M-2) #(mod M)
    }

    for(ll x=0;x<=k;x++){
        ans+=mod_c(n-1,x,mod)*m%mod*mod_pow(m-1,n-x-1,mod)%mod;
    }
    cout<<ans%mod<<endl;
    return 0;
}




Compiler output:
a.cc: In function 'long long int mod_pow(long long int, long long int, long long int)':
a.cc:17:5: error: return-statement with no value, in function returning 'long long int' [-fpermissive]
   17 |     return;//ここにはこないはず
      |     ^~~~~~
Language: C++

#include <iostream>
#include <functional>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <set>
#include <queue>
#include <stack>
#include <map>
#include <iomanip>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;++i)
#define repi(i,n) for(ll i=n-1;i>=0;--i)
#define sll(n) scanf("%lld", &n);
#define slf(n) scanf("%lf", &n);
typedef long long ll;
typedef double lf;
// auto mod int
// https://youtu.be/L8grWxBlIZ4?t=9858
// https://youtu.be/ERZuLAxZffQ?t=4807 : optimize
// https://youtu.be/8uowVvQ_-Mo?t=1329 : division
typedef long long ll;
const int max_n = 200010;
// const int mod = 1000000007;
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// vector<string> Qs(max_n);
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
};

combination comb(max_n);


void Main(){
    // bool is_ok = true;
    // printf("------------- V=%lld---------\n", V);
    ll N, M , K;
    string s;
    cin >> N >> M >> K;
    mint total = 0;
    rep(i,K+1){
        mint this_ = M;
        this_ = this_ * (this_-1).pow(N-i-1);
        this_ *= comb(N-1, i);
        total += this_;
        // cout << "i="<<i<<" " << total << endl;
    }

    cout << total << endl;
    // M * (M-1)^(N-k-1) * nCk

}

int main(){
    Main();

    return 0;

}

Compiler output:
a.cc: In constructor 'combination::combination(int)':
a.cc:63:5: error: 'assert' was not declared in this scope
   63 |     assert(n < mod);
      |     ^~~~~~
a.cc:13:1: note: 'assert' is defined in header '<cassert>'; this is probably fixable by adding '#include <cassert>'
   12 | #include <iomanip>
  +++ |+#include <cassert>
   13 | using namespace std;
Language: C++

#include<iostream>
#include<vector>

const int mod = 998244353;
struct mint {
	long long x;
	mint(long long x = 0) : x((x%mod + mod)%mod) {} 

	mint operator - () const { return mint(-x); } 

	mint& operator += (const mint& a){
		if((x += a.x) >= mod) x -= mod;
		return *this;
	}
	mint& operator -= (const mint& a){
		if ((x += mod-a.x) >= mod) x -= mod;
		return *this;
	}
	mint& operator *= (const mint& a) {
		(x *= a.x) %= mod;
		return *this;
	}

	mint operator + (const mint& a) const { return mint(*this) += a;}
	mint operator - (const mint& a) const { return mint(*this) -= a;}
	mint operator * (const mint& a) const { return mint(*this) *= a;}

	//べき乗
	mint pow(long long t) const{
		if(!t) return 1;
		mint a = pow(t >> 1); 
		a *= a;
		if(t&1) a *= *this;
		return a;
	}

	//逆元を求める
	mint inv() const {
		return pow(mod - 2);
	}
	//割り算
	mint& operator /= (const mint a) { return (*this) *= a.inv(); }
	mint operator / (const mint a) const { return mint(*this) /= a; }
};
//入出力
std::istream& operator >> (std::istream& is, const mint& a) { return is >> a.x; }
std::ostream& operator << (std::ostream& os, const mint& a) { return os << a.x; }

struct combination {
	std::vector<mint> fact, ifact;

	combination(int n) : fact(n+1), ifact(n+1) {
		assert(n < mod);
		fact[0] = 1;
		for(int i=1; i<=n; i++){
			fact[i] = fact[i-1] * i;
		}
		ifact[n] = fact[n].inv();
		for(int i=n; i>=1; i--){
			ifact[i-1] = ifact[i] * i;
		}
	}
	mint operator () (int n, int k){
		if(k < 0 || k > n) return 0;
		return fact[n]*ifact[k]*ifact[n-k];
	}
}c(200005);


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

	mint ans = 0, col = m;
	for(int x=n-1; x>=0; x--){
		mint now = col;
		now *= c(n-1, x);
		if(x <= k){
			ans += now;
		}
		col *= m-1;
	}

	std::cout << ans << std::endl;
	return 0;

}

Compiler output:
a.cc: In constructor 'combination::combination(int)':
a.cc:53:17: error: 'assert' was not declared in this scope
   53 |                 assert(n < mod);
      |                 ^~~~~~
a.cc:3:1: note: 'assert' is defined in header '<cassert>'; this is probably fixable by adding '#include <cassert>'
    2 | #include<vector>
  +++ |+#include <cassert>
    3 |
Language: C++

#include<Bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod=998244353,N=400010;
ll n,m,k,ans,jc[N],in[N],jcin[N];
ll exp(ll b,ll e,ll l){
	if(e==0) return 1;
	ll tmp=exp(b,e>>1,l);
	if(e&1) return tmp*tmp%l*b%l;
	else return tmp*tmp%l;
}
ll c(ll x,ll y){
	return jc[x]*jcin[y]%mod*jcin[x-y]%mod;
}
int main()
{
	scanf("%lld %lld %lld",&n,&m,&k);
	jc[0]=jcin[0]=1;
	jc[1]=in[1]=jcin[1]=1;
	for(ll i=2;i<N;++i){
		jc[i]=jc[i-1]*i%mod;
		in[i]=(mod-mod/i)*in[mod%i]%mod;
		jcin[i]=jcin[i-1]*in[i]%mod;
	}
	for(ll i=0;i<=k;++i){
		ll j=n-i;
		ans+=m*exp(m-1,j-1,mod)%mod*c(i+j-1,j-1)%mod;
		ans%=mod;
		//printf("%lld\n",ans);
	}
	printf("%lld\n",ans);
}

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

  #include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#define rep(i,n) for (long long i=0; i < (n); ++i)
#define rep2(i,n,m) for(long long i=n;i<=m;i++)
using namespace std;
using ll = long long;
using P = pair<int,int>;
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
  return *this;  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// コンビネーション
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}   c(200005);
//モドパウ
ll modpow(ll N, ll P){
ll ans = 1;
    for(ll i=0; i<P; ++i){
    ans *= N;ans %= mod;
    }return ans;
}

int main(){
   int n,m,k ;
   cin >>n>>m>>k ;
  mint ans=0 ; 
  mint gm =modpow(m-1,n-1) ;
  mint mm-=m ;
  rep2(i,0,k){
   ans+= mm*c(n-1,i)*gm ;
   gm/= mm-1 ;
  }
    cout << ans<< endl ;
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:70:10: error: expected initializer before '-=' token
   70 |   mint mm-=m ;
      |          ^~
a.cc:72:10: error: 'mm' was not declared in this scope; did you mean 'gm'?
   72 |    ans+= mm*c(n-1,i)*gm ;
      |          ^~
      |          gm
Language: C++

  #include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#define rep(i,n) for (long long i=0; i < (n); ++i)
#define rep2(i,n,m) for(long long i=n;i<=m;i++)
using namespace std;
using ll = long long;
using P = pair<int,int>;
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
  return *this;  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// コンビネーション
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}   c(200005);
//パウモド
ll modpow(ll N, ll P){
ll ans = 1;
    for(ll i=0; i<P; ++i){
    ans *= N;ans %= mod;
    }return ans;
}

int main(){
   int n,m,k ;
   cin >>n>>m>>k ;
  mint ans=0 ; 
  mint gm =powmod(m-１,n) ;
  rep2(i,0,k){
   ans+= gm*c(n-1,i)*gm ;
   gm/= m-1 ;
  }
    cout << ans<< endl ;
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:69:21: error: '１' was not declared in this scope
   69 |   mint gm =powmod(m-１,n) ;
      |                     ^~
a.cc:69:12: error: 'powmod' was not declared in this scope
   69 |   mint gm =powmod(m-１,n) ;
      |            ^~~~~~
Language: C++

  #include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#define rep(i,n) for (long long i=0; i < (n); ++i)
#define rep2(i,n,m) for(long long i=n;i<=m;i++)
using namespace std;
using ll = long long;
using P = pair<int,int>;
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
  return *this;  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// コンビネーション
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}   c(200005);
//パウモド
ll modpow(ll N, ll P){
ll ans = 1;
    for(ll i=0; i<P; ++i){
    ans *= N;ans %= mod;
    }return ans;
}

int main(){
   int n,m,k ;
   cin >>n>>m>>k ;
  mint ans=0 ; 
  mint gm =powmod(m-i,n) ;
  rep2(i,0,k){
   ans+= gm*c(n-1,i)*gm ;
   gm/= m-1 ;
  }
    cout << ans<< endl ;
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:69:21: error: 'i' was not declared in this scope
   69 |   mint gm =powmod(m-i,n) ;
      |                     ^
a.cc:69:12: error: 'powmod' was not declared in this scope
   69 |   mint gm =powmod(m-i,n) ;
      |            ^~~~~~
Language: C++

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

#define rep(i, a, b) for(int i = (a); i < (b); ++i)
#define all(x) begin(x), end(x)
typedef long long ll;
typedef pair<int, int> pii;
const int inf=1010001000;
const ll  INF=1001000100010001000;
const int mod=998244353;//(int)1e9+7;


vector<long long> fact, fact_inv, inv;   //fact[i]=i!   
void init_nCk(int SIZE) {                //inv[i]=i^(-1)           
    fact.resize(SIZE + 5);               //fact_inv[i]=inv[i]の累積積
    fact_inv.resize(SIZE + 5);
    inv.resize(SIZE + 5);
    fact[0] = fact[1] = 1;                          
    fact_inv[0] = fact_inv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < SIZE + 5; 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;
    }
}
 
/*  nCk :MODでの二項係数を求める(前処理 int_nCk が必要)
    計算量:O(1)
*/
long long nCk(int n, int k) {
    assert(!(n < k));
    assert(!(n < 0 || k < 0));
    return fact[n] * (fact_inv[k] * fact_inv[n - k] % mod) % mod;
}

long long modpow(long long a, long long n, long long mod) {
    long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % mod;
        a = a * a % mod;
        n >>= 1;
    }
    return res;
}

int main(){
    int n,m,k;
    cin>>n>>m>>k;
    vector<ll>v(n),sum(n+1,0);
    init_nCk(n);
  　ll ans=0;
    rep(i,0,n){
        ans+=m*modpow((m-1),n-1-i,mod)%mod*nCk(n-1,i)%mod;
    }
    cout<<ans<<endl;
return 0;
}


Compiler output:
a.cc:52:3: error: extended character 　 is not valid in an identifier
   52 |   　ll ans=0;
      |   ^
a.cc: In function 'int main()':
a.cc:52:3: error: '　ll' was not declared in this scope
   52 |   　ll ans=0;
      |   ^~~~
a.cc:54:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   54 |         ans+=m*modpow((m-1),n-1-i,mod)%mod*nCk(n-1,i)%mod;
      |         ^~~
      |         abs
a.cc:56:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   56 |     cout<<ans<<endl;
      |           ^~~
      |           abs
Language: C++

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

#define mod 998244353
using ll=long long;

ll fact[200002];
ll inv[200002];
ll invfact[200002];

ll modpow(ll n, ll m=mod-2) {
	ll r=1;
	while(m) r=r*((m%2)?n:1)%mod,n=n*n%mod,m>>=1;
	return r;
}

void calc_fact_invfact(){
  if(fact[0]==0){
    fact[0]=inv[1]=invfact[0]=1;
    for(int i=2;i<200002;i++) inv[i]=mod-inv[mod%i]*(mod/i)%mod;
    for(int i=1;i<200002;i++) fact[i] = fact[i-1]*i%mod,invfact[i]=invfact[i-1]*inv[i]%mod;
  }
}
int nCk(int n,int k){
  if(n<k || k<0) return 0;
  else return fact[n]*invfact[k]%mod*invfact[n-k]%mod;
}

int main(){

  ll n,m,k;
  cin >> n >> m >> k;

  ll ans = 0;

  calc_fact_invfact();
  for(int i=0;i<=k;i++)　ans += nCk(n-1,i)*(m%mod)%mod*modpow(m-1,n-1-i)%mod;

  cout << ans%mod << endl;

}

Compiler output:
a.cc:37:24: error: extended character 　 is not valid in an identifier
   37 |   for(int i=0;i<=k;i++)　ans += nCk(n-1,i)*(m%mod)%mod*modpow(m-1,n-1-i)%mod;
      |                        ^
a.cc: In function 'int main()':
a.cc:37:24: error: '\U00003000ans' was not declared in this scope
   37 |   for(int i=0;i<=k;i++)　ans += nCk(n-1,i)*(m%mod)%mod*modpow(m-1,n-1-i)%mod;
      |                        ^~~~~
Language: C++

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

#define mod 998244353
using ll=long long;

ll fact[200002];
ll inv[200002];
ll invfact[200002];

ll modpow(ll n, ll m=mod-2) {
	ll r=1;
	while(m)　r=r*((m%2)?n:1)%mod,n=n*n%mod,m>>=1;
	return r;
}

void calc_fact_invfact(){
  if(fact[0]==0){
    fact[0]=inv[1]=invfact[0]=1;
    for(int i=2;i<200002;i++) inv[i]=mod-inv[mod%i]*(mod/i)%mod;
    for(int i=1;i<200002;i++) fact[i] = fact[i-1]*i%mod,invfact[i]=invfact[i-1]*inv[i]%mod;
  }
}
int nCk(int n,int k){
  if(n<k || k<0) return 0;
  else return fact[n]*invfact[k]%mod*invfact[n-k]%mod;
}

int main(){

  ll n,m,k;
  cin >> n >> m >> k;

  ll ans = 0;

  calc_fact_invfact();
  for(int i=0;i<=k;i++)　ans += nCk(n-1,i)*(m%mod)%mod*modpow(m-1,n-1-i)%mod;

  cout << ans%mod << endl;

}

Compiler output:
a.cc:13:17: error: extended character 　 is not valid in an identifier
   13 |         while(m)　r=r*((m%2)?n:1)%mod,n=n*n%mod,m>>=1;
      |                 ^
a.cc:37:24: error: extended character 　 is not valid in an identifier
   37 |   for(int i=0;i<=k;i++)　ans += nCk(n-1,i)*(m%mod)%mod*modpow(m-1,n-1-i)%mod;
      |                        ^
a.cc: In function 'll modpow(ll, ll)':
a.cc:13:17: error: '\U00003000r' was not declared in this scope
   13 |         while(m)　r=r*((m%2)?n:1)%mod,n=n*n%mod,m>>=1;
      |                 ^~~
a.cc: In function 'int main()':
a.cc:37:24: error: '\U00003000ans' was not declared in this scope
   37 |   for(int i=0;i<=k;i++)　ans += nCk(n-1,i)*(m%mod)%mod*modpow(m-1,n-1-i)%mod;
      |                        ^~~~~
Language: C++

#include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#define rep(i,n) for (long long i=0; i < (n); ++i)
#define rep2(i,n,m) for(long long i=n;i<=m;i++)
using namespace std;
using ll = long long;
using P = pair<int,int>;
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
  return *this;  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// コンビネーション
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}   c(200005);
//パウモド
ll modpow(ll N, ll P, ll M){
ll ans = 1;
    for(ll i=0; i<P; ++i){
    ans *= N;ans %= M;
    }return ans;
}

int main(){
   int n,m,k ;cin >>n>>m>>k ;
  　mint ans=0 ; mint gm =m ;
  rep2(i,1,k){
   ans+= gm*c(n-1,i)*modpow(m-1,n-1-i,mod) ;
  }
    cout << ans<< endl ;
   return 0;
}

Compiler output:
a.cc:67:3: error: extended character 　 is not valid in an identifier
   67 |   　mint ans=0 ; mint gm =m ;
      |   ^
a.cc: In function 'int main()':
a.cc:67:3: error: '　mint' was not declared in this scope; did you mean 'mint'?
   67 |   　mint ans=0 ; mint gm =m ;
      |   ^~~~~~
      |   mint
a.cc:69:4: error: 'ans' was not declared in this scope; did you mean 'abs'?
   69 |    ans+= gm*c(n-1,i)*modpow(m-1,n-1-i,mod) ;
      |    ^~~
      |    abs
a.cc:71:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   71 |     cout << ans<< endl ;
      |             ^~~
      |             abs
Language: C++

#include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#define rep(i,n) for (long long i=0; i < (n); ++i)
#define rep2(i,n,m) for(long long i=n;i<=m;i++)
using namespace std;
using ll = long long;
using P = pair<int,int>;
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
const int mod = 998244353;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
  return *this;  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
// コンビネーション
struct combination {
  vector<mint> fact, ifact;
  combination(int n):fact(n+1),ifact(n+1) {
    assert(n < mod);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
    ifact[n] = fact[n].inv();
    for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
  }
  mint operator()(int n, int k) {
    if (k < 0 || k > n) return 0;
    return fact[n]*ifact[k]*ifact[n-k];
  }
}   c(200005);
//パウモド
ll modpow(ll N, ll P, ll M){
ll ans = 1;
    for(ll i=0; i<P; ++i){
    ans *= N;ans %= M;
    }return ans;
}

int main(){
   int n,m,k ;cin >>n>>m>>k ;
  　mint ans=0 ; mint gm =m ;
  rep2(i,1,k){
   ans+= gm*c(n-1,i)*powmod(m-1,n-1-i,mod) ;
  }
    cout << ans<< endl ;
   return 0;
}

Compiler output:
a.cc:67:3: error: extended character 　 is not valid in an identifier
   67 |   　mint ans=0 ; mint gm =m ;
      |   ^
a.cc: In function 'int main()':
a.cc:67:3: error: '　mint' was not declared in this scope; did you mean 'mint'?
   67 |   　mint ans=0 ; mint gm =m ;
      |   ^~~~~~
      |   mint
a.cc:69:4: error: 'ans' was not declared in this scope; did you mean 'abs'?
   69 |    ans+= gm*c(n-1,i)*powmod(m-1,n-1-i,mod) ;
      |    ^~~
      |    abs
a.cc:69:22: error: 'powmod' was not declared in this scope
   69 |    ans+= gm*c(n-1,i)*powmod(m-1,n-1-i,mod) ;
      |                      ^~~~~~
a.cc:71:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   71 |     cout << ans<< endl ;
      |             ^~~
      |             abs
Language: C++

/*
AUTHOR: Aman Raj
LANG: C++
*/

using namespace std;

typedef   long long  ll;
#include <bits/stdc++.h>


//setbase - cout << setbase (16); cout << 100 << endl; Prints 64
//setfill -   cout << setfill ('x') << setw (5); cout << 77 << endl; prints xxx77
//setprecision - cout << setprecision (14) << f << endl; Prints x.xxxx
//cout.precision(x)  cout<<fixed<<val;  // prints x digits after decimal in val
#define fast  ios_base::sync_with_stdio(false); cin.tie(0);  cout.tie(0);
#define all(a) a.begin(),a.end()
#define mod 998244353
#define inf 1e9
//#define mod 3
#define flush fflush(stdout)

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef cc_hash_table<int, ll, hash<ll> > ht;

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






ll power1(ll a, ll b)//a raised to power b
   {  if(b<=0) return 1; if(b==1) return a;
       ll c=power1(a,b/2);
        c*=c;c=c%mod;if(b%2==1) c*=a;c=c%mod;
        return c;
   }
   ll mi(ll a,ll m)
   { ll c= power1(a,m-2);

     return c;
   }



  int main()
{    fast;
    ll n,m,k;cin>>n>>m>>k;
    if(m==1)
    {
        if(k==n-1)cout<<1<<endl;
        else cout<<0<<endl;continue;
    }
     ll ans=m*power1(m-1,n-1),a=1,b=power1(m-1,n-1);
    // cout<<ans<<endl;
     for(ll i=1;i<=k;i++)
     {
         a=((a*(n-i))%mod)*mi(i,mod);a%=mod;//cout<<a<<endl;
         b=b*mi(m-1,mod);b%=mod;//b=1;
         ans+=(((a*m)%mod)*b)%mod;ans%=mod;
     }
     ans%=mod;
     cout<<ans<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:62:28: error: continue statement not within a loop
   62 |         else cout<<0<<endl;continue;
      |                            ^~~~~~~~
Language: C++

uurskl#include<bits/stdc++.h>
using namespace std ;
#define pb push_back
#define ll long long
#define mod 998244353
const ll N = 200007 ;
ll fact[N] ;
ll BigMod(ll a, ll b)
{
    if(b==0) return 1;
    ll x=BigMod(a, b/2);
    if(b%2==0) return (x*x)%mod;
    x=(x*x)%mod;
    return (x*a)%mod;
}


ll inv (ll x) {
    return BigMod (x , mod-2 ) % mod ;
}

ll c ( ll n , ll r) {
    ll iv = inv( (fact[r] *fact[n-r])%mod ) %mod  ;
    iv+=mod ;
    iv%=mod ;
    return ( fact[n] * iv )%mod ;

}

void fun (  ) {
    fact[0]= fact[1] = 1 ;
    for (ll i = 2 ; i<N ; i++ ) fact[i] = (i*fact[i-1]) %mod ;
}


int main() {
    fun() ;
    ll n , m , k ,i;

    cin>>n  >> m >> k ;

    ll ans = 0 ;
    for (i = 0 ; i<=k ;i++) {
        ans += ( (c(n-1,i) * m)%mod * BigMod(m-1,n-i-1) ) ;
        ans%=mod ;
        ans += mod ;
        ans%=mod ;

    }
    cout << ans << endl ;


}


Compiler output:
a.cc:1:7: error: stray '#' in program
    1 | uurskl#include<bits/stdc++.h>
      |       ^
a.cc:1:1: error: 'uurskl' does not name a type
    1 | uurskl#include<bits/stdc++.h>
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:40:5: error: 'cin' was not declared in this scope
   40 |     cin>>n  >> m >> k ;
      |     ^~~
a.cc:50:5: error: 'cout' was not declared in this scope
   50 |     cout << ans << endl ;
      |     ^~~~
a.cc:50:20: error: 'endl' was not declared in this scope
   50 |     cout << ans << endl ;
      |                    ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
typedef pair<int, int> P;
ll Mod = 998244353;


ll modPow(ll a, ll n, ll p) {
  if (n == 1) return a % p;
  if (n % 2 == 1) return (a * modPow(a, n - 1, p)) % p;
  ll t = modPow(a, n / 2, p);
  return (t * t) % p;
}

ll modinv(ll a, ll m) {
    ll b = m, u = 1, v = 0;
    while (b) {
        ll t = a / b;
        a -= t * b; swap(a, b);
        u -= t * v; swap(u, v);
    }
    u %= m;
    if (u < 0) u += m;
    return u;
}
ll fact[200003];
ll ifact[200003];
ll Combination(ll a,ll b) {
  ll s = (fact[a] * ifact[b]) % Mod;
  return (s * ifact[a-b]) % Mod;
}


int main() {
  fact[0] = 1;
  ifact[0] = 1;
  for (int i = 1; i <= 200003; i++) {
    fact[i] = fact[i-1] * i;
    fact[i] %= Mod;
    ifact[i] = modinv(fact[i],Mod);
  }
  ll N,M,K;
  cin >> N >> M >> K;
  ll ans = 0;
  for (int i = 0; i <= K; i++) {
    ll res = 1;
    res *= M;
    res *= modPow(M-1,N-1-i);
    res %= Mod;
    res *= Combination(N-1,i);
    res %= Mod;
    ans += res;
    ans %= Mod;
  }
  if (ans < 0) {
    ans += Mod;
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:48:18: error: too few arguments to function 'll modPow(ll, ll, ll)'
   48 |     res *= modPow(M-1,N-1-i);
      |            ~~~~~~^~~~~~~~~~~
a.cc:8:4: note: declared here
    8 | ll modPow(ll a, ll n, ll p) {
      |    ^~~~~~