結果
問題 | No.1887 K Consecutive Ks (Easy) |
ユーザー | anmichi |
提出日時 | 2022-03-25 23:35:00 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 981 ms / 2,000 ms |
コード長 | 6,044 bytes |
コンパイル時間 | 2,238 ms |
コンパイル使用メモリ | 213,176 KB |
実行使用メモリ | 38,528 KB |
最終ジャッジ日時 | 2024-10-14 07:49:22 |
合計ジャッジ時間 | 9,357 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 2 ms
5,248 KB |
testcase_01 | AC | 2 ms
5,248 KB |
testcase_02 | AC | 976 ms
38,528 KB |
testcase_03 | AC | 2 ms
5,248 KB |
testcase_04 | AC | 2 ms
5,248 KB |
testcase_05 | AC | 2 ms
5,248 KB |
testcase_06 | AC | 2 ms
5,248 KB |
testcase_07 | AC | 1 ms
5,248 KB |
testcase_08 | AC | 2 ms
5,248 KB |
testcase_09 | AC | 1 ms
5,248 KB |
testcase_10 | AC | 2 ms
5,248 KB |
testcase_11 | AC | 109 ms
9,856 KB |
testcase_12 | AC | 34 ms
5,504 KB |
testcase_13 | AC | 917 ms
36,864 KB |
testcase_14 | AC | 956 ms
38,272 KB |
testcase_15 | AC | 928 ms
38,144 KB |
testcase_16 | AC | 652 ms
27,392 KB |
testcase_17 | AC | 596 ms
27,392 KB |
testcase_18 | AC | 981 ms
38,528 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; using ll = long long; #define rep(i, n) for (int i = 0; i < n; i++) #define all(v) v.begin(), v.end() template <class T, class U> inline bool chmax(T &a, U b) { if (a < b) { a = b; return true; } return false; } template <class T, class U> inline bool chmin(T &a, U b) { if (a > b) { a = b; return true; } return false; } constexpr int INF = 1000000000; constexpr ll llINF = 3000000000000000000; constexpr int mod = 998244353; const ll half = (mod + 1) / 2; constexpr double eps = 1e-10; vector<int> prime_list(int n) { vector<int> v(n + 1), res; for (int i = n; i >= 2; i--) { for (int j = i; j <= n; j += i) v[j] = i; } for (int i = 2; i <= n; i++) { if (v[i] == i) res.push_back(i); } return res; } vector<int> next_divisor(int n) { vector<int> v(n + 1); for (int i = n; i >= 2; i--) { for (int j = i; j <= n; j += i) v[j] = i; } return v; } ll modpow(ll a, ll b, ll m = mod) { ll res = 1; while (b) { if (b & 1) { res *= a; res %= m; } a *= a; a %= m; b >>= 1; } return res; } vector<ll> inv, fact, factinv; void init_fact(int n) { inv.resize(n + 1); fact.resize(n + 1); factinv.resize(n + 1); inv[0] = 0; inv[1] = 1; fact[0] = 1; factinv[0] = 1; for (ll i = 1; i <= n; i++) { if (i >= 2) inv[i] = mod - ((mod / i) * inv[mod % i] % mod); fact[i] = (fact[i - 1] * i) % mod; factinv[i] = factinv[i - 1] * inv[i] % mod; } } ll modinv(ll a, ll m = mod) { // gcd(a,m) must be 1 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 comb(int a, int b) { if (a < b || a < 0 || b < 0) return 0; return fact[a] * factinv[a - b] % mod * factinv[b] % mod; } /* struct S { long long val; int sz; }; using F = long long; S op(S a, S b) { return S{a.val + b.val, a.sz + b.sz}; } S e() { return S{0, 0}; } S mapping(F f, S x) { return S{x.val + f * x.sz, x.sz}; } F composition(F f, F g) { return f + g; } F id() { return 0; } struct segtree { int sz = 1; vector<S> d; vector<F> lz; segtree(vector<S> a) { int n = a.size(); while (sz < n) sz <<= 1; d.resize(sz * 2 - 1, e()); lz.resize(sz * 2 - 1, id()); for (int i = 0; i < n; i++) d[i + sz - 1] = a[i]; for (int i = sz - 2; i >= 0; i--) d[i] = op(d[i * 2 + 1], d[i * 2 + 2]); } void eval(int k) { d[k] = mapping(lz[k], d[k]); if (k <= sz - 2) { lz[k * 2 + 1] = composition(lz[k], lz[k * 2 + 1]); lz[k * 2 + 2] = composition(lz[k], lz[k * 2 + 2]); } lz[k] = id(); } void update(int a, int b, F f, int k = 0, int l = 0, int r = -1) { eval(k); if (r == -1) r = sz; if (r <= a || b <= l) return; if (a <= l && r <= b) { lz[k] = composition(f, lz[k]); eval(k); return; } int m = (l + r) >> 1; update(a, b, f, k * 2 + 1, l, m); update(a, b, f, k * 2 + 2, m, r); d[k] = op(d[k * 2 + 1], d[k * 2 + 2]); } S prod(int a, int b, int k = 0, int l = 0, int r = -1) { eval(k); if (r == -1) r = sz; if (r <= a || b <= l) return e(); if (a <= l && r <= b) return d[k]; int m = (l + r) >> 1; S vl = prod(a, b, k * 2 + 1, l, m); S vr = prod(a, b, k * 2 + 2, m, r); return op(vl, vr); } };*/ struct HLD { int n; vector<int> in, out, sz, par, top, depth; vector<vector<int>> g; HLD(vector<vector<int>> g) : g(g), n(g.size()), in(n), out(n), sz(n), par(n), top(n), depth(n) { dfs_sz(0); dfs_hld(0); } int t = 0; void dfs_sz(int v, int p = -1) { if (g[v][0] == p && g[v].size() > 1) swap(g[v][0], g[v][1]); sz[v] = 1; for (int &i : g[v]) { if (i == p) continue; dfs_sz(i, v); sz[v] += sz[i]; if (sz[g[v][0]] < sz[i]) swap(i, g[v][0]); } } void dfs_hld(int v, int p = -1) { in[v] = t++; for (int i : g[v]) { if (i == p) continue; if (i == g[v][0]) { // heavy par[i] = par[v]; top[i] = top[v]; depth[i] = depth[v]; } else { par[i] = v; top[i] = i; depth[i] = depth[v] + 1; } dfs_hld(i, v); } out[v] = t; } }; template <class T> struct BIT { // 1-indexed int n; vector<T> bit; BIT(int x) { bit.resize(x + 1, 0); n = x; } T sum(int i) { T res = 0; while (i > 0) { res += bit[i]; if (res >= mod) res -= mod; i -= i & -i; } return res; } void add(int i, T x) { while (i <= n) { bit[i] += x; if (bit[i] >= mod) bit[i] -= mod; i += i & -i; } } }; void solve() { int n, m; cin >> n >> m; vector<BIT<int>> dp(m + 1, BIT<int>(n + 1)); BIT<int> sum(n + 1); dp[1].add(1, 1); sum.add(1, 1); for (int i = 2; i <= n + 1; i++) { for (int k = 2; k <= m; k++) { // length:[1,k) // last:(i-k,i) ll res = 0; res += sum.sum(i - 1) + mod - sum.sum(i - k); res %= mod; res += (mod - dp[k].sum(i - 1) + dp[k].sum(i - k)) % mod; res %= mod; sum.add(i, res); dp[k].add(i, res); } } cout << (modpow(m, n) + mod - sum.sum(n + 1) + sum.sum(n)) % mod << endl; } int main() { cin.tie(0); ios::sync_with_stdio(false); /*int t; cin >> t; while (t--)*/ solve(); }