提出 #74713943

---

ソースコード 拡げる

#include <bits/stdc++.h>
#define rep(i, x, y) for (int i = x; i <= y; ++i)
#define drep(i, x, y) for (int i = x; i >= y; --i)
#define ll long long
#define pb emplace_back
#define pii pair<int, int>
#define fi first
#define se second
#define ALL(x) (x).begin(), (x).end()
#define fastio ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)
using namespace std;
const int N = 300005;
const int mod = 998244353;
inline ll qp(ll a, ll b = mod - 2) {
	ll s = 1;
	for(; b; b >>= 1, a = a * a % mod)
		if(b & 1) s = s * a % mod; return s;
}

vector<int> G[N];
int sz[N], n;
ll ans, k;
inline void dfs(int u, int fa) {
    sz[u] = 1;
    for(int v : G[u]) {
        if(v == fa) continue;
        dfs(v, u);
        sz[u] += sz[v];
        ans = (ans + (ll)sz[v] * (n - sz[v])) % mod;
    }
}
inline ll F(int x) { return (ll)(x - 1) * x % mod * (x + 1) % mod; }
inline void solve() {
	cin >> n >> k;
    rep(i, 1, n) G[i].clear();
    rep(i, 2, n) {
        int u, v; cin >> u >> v;
        G[u].pb(v), G[v].pb(u);
    }
	ans = 0, dfs(1, 0);
	ans = ans * F(n + k) % mod * qp(F(n)) % mod;
    cout << ans << '\n';
}
int main() {
	fastio;
    int T; cin >> T;
    while(T--) solve();
    return 0;
}

提出情報

コンパイルエラー

./Main.cpp: In function 'long long int qp(long long int, long long int)':
./Main.cpp:17:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   17 |                 if(b & 1) s = s * a % mod; return s;
      |                 ^~
./Main.cpp:17:44: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   17 |                 if(b & 1) s = s * a % mod; return s;
      |                                            ^~~~~~
./Main.cpp:16:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   16 |         for(; b; b >>= 1, a = a * a % mod)
      |         ^~~
./Main.cpp:17:44: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   17 |                 if(b & 1) s = s * a % mod; return s;
      |                                            ^~~~~~

ジャッジ結果