結果
| 問題 |
No.1019 最小格子三角形
|
| ユーザー |
satashun
|
| 提出日時 | 2020-04-05 03:05:49 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,064 ms / 2,000 ms |
| コード長 | 3,082 bytes |
| コンパイル時間 | 2,731 ms |
| コンパイル使用メモリ | 200,212 KB |
| 最終ジャッジ日時 | 2025-01-09 14:12:30 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 24 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
template<class T> using V = vector<T>;
template<class T> using VV = V<V<T>>;
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i,n) rep2(i,0,n)
#define rep2(i,m,n) for(int i=m;i<(n);i++)
#define ALL(c) (c).begin(),(c).end()
#ifdef LOCAL
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define dump(x) true
#endif
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n-1); }
template<class T, class U> void chmin(T& t, const U& u) { if (t > u) t = u; }
template<class T, class U> void chmax(T& t, const U& u) { if (t < u) t = u; }
template<class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
os<<"("<<p.first<<","<<p.second<<")";
return os;
}
template<class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
os<<"{";
rep(i, v.size()) {
if (i) os<<",";
os<<v[i];
}
os<<"}";
return os;
}
template <unsigned int MOD>
struct ModInt {
using uint = unsigned int;
using ull = unsigned long long;
using M = ModInt;
uint v;
ModInt(ll _v = 0) { set_norm(_v % MOD + MOD); }
M& set_norm(uint _v) { //[0, MOD * 2)->[0, MOD)
v = (_v < MOD) ? _v : _v - MOD;
return *this;
}
explicit operator bool() const { return v != 0; }
M operator+(const M& a) const { return M().set_norm(v + a.v); }
M operator-(const M& a) const { return M().set_norm(v + MOD - a.v); }
M operator*(const M& a) const { return M().set_norm(ull(v) * a.v % MOD); }
M operator/(const M& a) const { return *this * a.inv(); }
M& operator+=(const M& a) { return *this = *this + a; }
M& operator-=(const M& a) { return *this = *this - a; }
M& operator*=(const M& a) { return *this = *this * a; }
M& operator/=(const M& a) { return *this = *this / a; }
M operator-() const { return M() - *this; }
M& operator++(int) { return *this = *this + 1; }
M& operator--(int) { return *this = *this - 1; }
M pow(ll n) const {
if (n < 0) return inv().pow(-n);
M x = *this, res = 1;
while (n) {
if (n & 1) res *= x;
x *= x;
n >>= 1;
}
return res;
}
M inv() const {
ll a = v, b = MOD, p = 1, q = 0, t;
while (b != 0) {
t = a / b;
swap(a -= t * b, b);
swap(p -= t * q, q);
}
return M(p);
}
bool operator==(const M& a) const { return v == a.v; }
bool operator!=(const M& a) const { return v != a.v; }
friend ostream& operator<<(ostream& os, const M& a) { return os << a.v; }
static int get_mod() { return MOD; }
};
using Mint = ModInt<998244353>;
//sum of abs(x) + abs(y)
Mint calc_all(ll n) { //do not care about gcd
Mint res;
for (ll x = 1; x * x <= n; ++x) {
ll y = (ll)sqrt(n - x * x) * 2 + 1;
res += (Mint)y * x * 2;
}
return res * 2;
}
map<ll, Mint> dp;
Mint calc(ll n) {
if (dp.count(n)) {
return dp[n];
}
Mint x = calc_all(n);
for (ll d = 2; d * d <= n; ++d) {
x -= calc(n / d / d) * d;
}
return dp[n] = x;
}
int main() {
ll N; cin >> N;
auto ret = calc(N);
cout << ret * 6 - 16 << endl;
return 0;
}
satashun