Jubilee

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

#ifdef LOCAL
#define D(x) {x;}
#else
#define D(x)
#endif
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x),end(x)
#define sz(x) (int) (x).size()
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

const ll M = 1e9 + 7;

int main() {
    cin.tie(0) -> sync_with_stdio(0);
    cin.exceptions(cin.failbit);

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

    ll dp = m * (m-1) % M;
    for (int i = 1; i < n; ++i) {
        ll dpn = ((m-1) * (m-1) - (m-2)) % M;
        dp = dp * dpn % M;
    }

    cout << dp << '\n';
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED