結果

問題 No.2511 Mountain Sequence
ユーザー yuusaan
提出日時 2024-11-02 12:19:30
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 57 ms / 2,000 ms
コード長 5,890 bytes
コンパイル時間 5,854 ms
コンパイル使用メモリ 323,376 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-11-02 12:19:39
合計ジャッジ時間 8,564 ms
ジャッジサーバーID
(参考情報)
judge5 / judge1
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 32
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <iostream>
#include <string>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <tuple>
#include <map>
#include<set>
#include<queue>
#include<stack>
#include <unordered_set>
#include<thread>
#include<bits/stdc++.h>
#include <numbers>
#include <atcoder/all>
#include <cstdio>
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
//if(a < 0 || h <= a || b < 0 || w <= b)return;
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using mint = modint998244353;
using mint1 = modint1000000007;
//using VL = vector<ll>;
template<typename T> using pq = priority_queue<T>;//?()
template<typename T> using pqg = priority_queue<T, vector<T>, greater<T>>;//?()
template<typename T> using vector2 = vector<vector<T>>;
template<typename T> using vector3 = vector<vector<vector<T>>>;
template<typename T> using vector4 = vector<vector<vector<vector<T>>>>;
template<typename T> using vector5 = vector<vector<vector<vector<vector<T>>>>>;
template<typename T> using vector6 = vector<vector<vector<vector<vector<vector<T>>>>>>;
template<typename T> using pairs = pair<T,T>;
#define rep(i, n) for (ll i = 0; i < ll(n); i++)
#define rep1(i,n) for(int i = 1;i <= int(n);i++)
#define repm(i, m, n) for (int i = (m); (i) < int(n);(i)++)
#define repmr(i, m, n) for (int i = (m) - 1; (i) >= int(n);(i)--)
#define rep0(i,n) for(int i = n - 1;i >= 0;i--)
#define rep01(i,n) for(int i = n;i >= 1;i--)
// NKN < 2^64, K <= 64
uint64_t kth_root(uint64_t N, uint64_t K) {
assert(K >= 1);
if (N <= 1 || K == 1) return N;
if (K >= 64) return 1;
if (N == uint64_t(-1)) --N;
auto mul = [&](uint64_t x, uint64_t y) -> uint64_t {
if (x < UINT_MAX && y < UINT_MAX) return x * y;
if (x == uint64_t(-1) || y == uint64_t(-1)) return uint64_t(-1);
return (x <= uint64_t(-1) / y ? x * y : uint64_t(-1));
};
auto power = [&](uint64_t x, uint64_t k) -> uint64_t {
if (k == 0) return 1ULL;
uint64_t res = 1ULL;
while (k) {
if (k & 1) res = mul(res, x);
x = mul(x, x);
k >>= 1;
}
return res;
};
uint64_t res;
if (K == 2) res = sqrtl(N) - 1;
else if (K == 3) res = cbrt(N) - 1;
else res = pow(N, nextafter(1 / double(K), 0));
while (power(res + 1, K) <= N) ++res;
return res;
}
//
ll GCD(ll a,ll b){
if(b == 0)return a;
return GCD(b, a % b);
}
//(ax + by = GCD(a,b))x,y
pair<long long, long long> extgcd(long long a, long long b) {
if (b == 0) return make_pair(1, 0);
long long x, y;
tie(y, x) = extgcd(b, a % b);
y -= a / b * x;
return make_pair(x, y);
}
struct UnionFind {
vector<int> par; // par[i]:i () par[3] = 2 : 32
UnionFind(int N) : par(N) { //
for(int i = 0; i < N; i++) par[i] = i;
}
int root(int x) { // xroot(x) = {x}
if (par[x] == x) return x;
return par[x] = root(par[x]);
}
void unite(int x, int y) { // xy
int rx = root(x); //xrx
int ry = root(y); //yry
if (rx == ry) return; //xy(=)
par[rx] = ry; //xy(=)xrxyry
}
bool same(int x, int y) { // 2x, ytrue
int rx = root(x);
int ry = root(y);
return rx == ry;
}
};
ll n;
//
vector<ll> Ccomp(vector<ll> a){
vector<ll> b = a;
sort(b.begin(),b.end());
b.erase(unique(b.begin(),b.end()),b.end());//
vector<ll> rtn;
rep(j,a.size()){
ll pb = lower_bound(b.begin(),b.end(),a[j]) - b.begin();
rtn.push_back(pb);
}
return rtn;
}
/// ////////////////////////////////////////////
using F = pairs<ll>;
using S = pairs<ll>;
string s;
ll modPow(ll a, ll n, ll mod) { if(mod==1) return 0;ll ret = 1; ll p = a % mod; while (n) { if (n & 1) ret = ret * p % mod; p = p * p % mod; n >>= 1;
    } return ret; }
void cincout(){
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
cout<< fixed << setprecision(15);
}
//seg,seg-----
S op(S a,S b){
return a;
}//()
S e(){return {1,n};}
S mapping (F a,S b){
if(a.second == 0)return b;
else return a;
}//
F composition (F a,F b){
if(a.second == 0)return b;
return a;
}//
F id(){return {0,0};}//
vector<int> Op(vector<int> a,vector<int> b){a.insert(a.end(),b.begin(),b.end()); return a;}
vector<int> E(){return vector<int> (0);}
//seg
string abc = "abcdefghijklmnopqrstuvwxyz";
string Labc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
ll mod = ll(1e9) + 7;
ll INF =ll(2e18);
vector<ll> movey = {-1,0,1,0},movex = {0,1,0,-1};
bool outc(ll nowy,ll nowx,ll h,ll w){
if(nowy < 0 || nowy >= h || nowx < 0 || nowx >= w){
return 0;
}
return 1;
}
int main() {
cincout();
ll n,m;
cin >> n >> m;
vector<mint> fact(2*m+10,1);
for(ll j = 2;j <= 2*m;j++){
fact[j] = fact[j-1] * j;
}
if(2*m-1<n){
cout << 0 << endl;
return 0;
}
mint ans = 0;
for(int j = 1;j <= m;j++){
if(2 * j - 1 < n)continue;
ans += fact[2*(j-1)] / fact[n-1] / fact[2*(j-1)-(n-1)];
}
cout << ans.val() << endl;
return 0;
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0