結果
| 問題 |
No.2902 ZERO!!
|
| コンテスト | |
| ユーザー |
bortik
|
| 提出日時 | 2024-10-02 03:04:21 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,999 ms / 2,000 ms |
| コード長 | 3,904 bytes |
| コンパイル時間 | 4,705 ms |
| コンパイル使用メモリ | 303,156 KB |
| 実行使用メモリ | 14,240 KB |
| 最終ジャッジ日時 | 2024-10-02 03:04:54 |
| 合計ジャッジ時間 | 28,758 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 41 |
ソースコード
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using u32 = unsigned int;
using u64 = unsigned long long;
#if __cplusplus >= 202002L
using i128 = __int128;
using u128 = unsigned __int128;
using f128 = __float128;
#endif
template<typename T>
bool chmax(T& a, const T& b) {
bool res = a < b;
a = max(a, b);
return res;
}
template<typename T>
bool chmin(T& a, const T& b){
bool res = a > b;
a = min(a, b);
return res;
}
typedef vector<long long> vl;
typedef pair<ll,ll> pll;
typedef vector<pair<ll, ll>> vll;
typedef vector<int> vi;
typedef vector<pair<int,int>> vii;
typedef pair<int,int> pii;
const int inf = 1000000009;
const ll linf = 4000000000000000009;
// https://trap.jp/post/1224/
template<class... T>
void input(T&... a){
(cin >> ... >> a);
}
void print(){
cout << '\n';
}
template<class T, class... Ts>
void print(const T& a, const Ts&... b){
cout << a;
(cout << ... << (cout << ' ', b));
cout << '\n';
}
template <typename T>
T floor(T a, T b) {
return a / b - (a % b && (a ^ b) < 0);
}
template <typename T>
T ceil(T x, T y) {
return floor(x + y - 1, y);
}
int popcnt(int x) { return __builtin_popcount(x); }
int popcnt(u32 x) { return __builtin_popcount(x); }
int popcnt(ll x) { return __builtin_popcountll(x); }
int popcnt(u64 x) { return __builtin_popcountll(x); }
int popcnt_mod_2(int x) { return __builtin_parity(x); }
int popcnt_mod_2(u32 x) { return __builtin_parity(x); }
int popcnt_mod_2(ll x) { return __builtin_parityll(x); }
int popcnt_mod_2(u64 x) { return __builtin_parityll(x); }
// (0, 1, 2, 3, 4) -> (-1, 0, 1, 1, 2)
int topbit(int x) { return (x == 0 ? -1 : 31 - __builtin_clz(x)); }
int topbit(u32 x) { return (x == 0 ? -1 : 31 - __builtin_clz(x)); }
int topbit(ll x) { return (x == 0 ? -1 : 63 - __builtin_clzll(x)); }
int topbit(u64 x) { return (x == 0 ? -1 : 63 - __builtin_clzll(x)); }
// (0, 1, 2, 3, 4) -> (-1, 0, 1, 0, 2)
int lowbit(int x) { return (x == 0 ? -1 : __builtin_ctz(x)); }
int lowbit(u32 x) { return (x == 0 ? -1 : __builtin_ctz(x)); }
int lowbit(ll x) { return (x == 0 ? -1 : __builtin_ctzll(x)); }
int lowbit(u64 x) { return (x == 0 ? -1 : __builtin_ctzll(x)); }
template<typename T, typename U>
T SUM(const vector<U> &A){
T ret = 0;
for (auto &&a: A) ret += a;
return ret;
}
#define rep1(a) for(int i = 0; i < a; i++)
#define rep2(i, a) for(int i = 0; i < a; i++)
#define rep3(i, a, b) for(int i = a; i < b; i++)
#define rep4(i, a, b, c) for(int i = a; i < b; i += c)
#define overload4(a, b, c, d, e, ...) e
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define eb emplace_back
#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
#define all(v) v.begin(), v.end()
//---------------------------------
const ll MOD = 998244353;
vector<pll> factorize(ll n) {
vector<pll> res;
for(int i = 2; i*i <= n; i++){
if(n%i == 0){
ll cnt = 0;
while(n%i==0){
cnt++;
n /= i;
}
res.push_back(mp(i, cnt));
}
}
if(n > 1) res.push_back(mp(n, 1));
return res;
}
void solve(){
ll N; cin >> N;
ll ans = 0;
unordered_map<ll, ll> cnt;
rep(i, 2, N+1) {
auto facts = factorize(i);
for(auto [f, num]: facts) cnt[f] += num;
}
vl states(N+1, 1);
for(auto [f, num]: cnt){
for(int i = 1; num / i > 0; i++){
states[i] *= num / i + 1;
states[i] %= MOD;
}
}
rep(i, N+1){
ans += states[i] - 1;
ans %= MOD;
}
print(ans);
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int t = 1;
//cin >> t;
rep(i,0,t) solve();
}
bortik