結果
| 問題 |
No.2173 Nightcord
|
| コンテスト | |
| ユーザー |
Kude
|
| 提出日時 | 2022-12-25 09:37:36 |
| 言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
| 結果 |
MLE
|
| 実行時間 | - |
| コード長 | 6,840 bytes |
| コンパイル時間 | 11,088 ms |
| コンパイル使用メモリ | 310,096 KB |
| 最終ジャッジ日時 | 2025-02-09 20:45:33 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 28 WA * 10 TLE * 15 MLE * 1 |
ソースコード
#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
struct Vec {
using etype = int; // type of elements
using ptype = long long; // type of product results
etype x = 0, y = 0;
constexpr Vec operator-() const { return {-x, -y}; }
friend constexpr Vec operator+(const Vec& a, const Vec& b) { return {a.x + b.x, a.y + b.y}; }
friend constexpr Vec operator-(const Vec& a, const Vec& b) { return {a.x - b.x, a.y - b.y}; }
friend constexpr etype operator*(const Vec& a, const Vec& b) { return a.x * b.y - a.y * b.x; }
template <class T, enable_if_t<is_integral_v<T>>* = nullptr>
friend constexpr Vec operator*(T c, const Vec& a) { return {c * a.x, c * a.y}; }
template <class T, enable_if_t<is_integral_v<T>>* = nullptr>
friend constexpr Vec operator*(const Vec& a, T c) { return c * a; }
template <class T, enable_if_t<is_integral_v<T>>* = nullptr>
friend constexpr Vec operator/(const Vec& a, T c) { return {a.x / c, a.y / c}; }
Vec& operator+=(const Vec& a) { x += a.x; y += a.y; return *this; }
Vec& operator-=(const Vec& a) { x -= a.x; y -= a.y; return *this; }
template <class T, enable_if_t<is_integral_v<T>>* = nullptr>
Vec& operator*=(T c) { x *= c; y *= c; return *this; }
friend constexpr bool operator==(const Vec& a, const Vec& b) { return a.x == b.x && a.y == b.y; }
friend constexpr bool operator!=(const Vec& a, const Vec& b) { return !(a == b); }
constexpr int quadrant() const { return y > 0 ? (x > 0 ? 0 : 1) : y < 0 ? (x < 0 ? 2 : 3) : (x > 0 ? 0 : x < 0 ? 2 : -1); }
friend constexpr bool operator<(const Vec& a, const Vec& b) {
int qa = a.quadrant(), qb = b.quadrant();
if (qa != qb) return qa < qb;
ptype p1 = (ptype)a.x * b.y, p2 = (ptype)a.y * b.x;
return p1 > p2 || (p1 == p2 && (a.x != 0 ? abs(a.x) < abs(b.x) : abs(a.y) < abs(b.y)));
}
friend constexpr bool operator>(const Vec& a, const Vec& b) { return b < a; }
friend constexpr bool operator<=(const Vec& a, const Vec& b) { return !(b < a); }
friend constexpr bool operator>=(const Vec& a, const Vec& b) { return !(a < b); }
constexpr int ccw(const Vec& u, const Vec& v) const { ptype p = (u - *this) * (v - *this); return p > 0 ? 1 : p < 0 ? -1 : 0; }
static constexpr bool intersects(const Vec& a, const Vec& b, const Vec& c, const Vec& d) { return a.ccw(b, c) * a.ccw(b, d) <= 0 && c.ccw(d, a) * c.ccw(d, b) <= 0; }
constexpr bool parallel_to(const Vec& a) const { return (ptype)x * a.y == (ptype)y * a.x; }
constexpr ptype dot(const Vec& a) const { return (ptype)x * a.x + (ptype)y * a.y; }
constexpr ptype norm2() const { return (ptype)x * x + (ptype)y * y; }
constexpr bool is_zero() const { return x == 0 && y == 0; }
constexpr Vec normalize() const {
if (y == 0) return Vec{x == 0 ? 0 : 1, 0};
etype g = gcd(x, y);
return *this / (y > 0 ? g : -g);
}
constexpr Vec rot90() const { return {-y, x}; }
// exclusive
constexpr bool in_between(const Vec& a, const Vec& b) const {
Vec x = a - *this, y = b - *this;
return x.parallel_to(y) && x.dot(y) < 0;
}
friend std::ostream& operator<< (std::ostream& os, const Vec& t) { return os << t.x << ' ' << t.y; }
friend std::istream& operator>> (std::istream& os, Vec& t) { return os >> t.x >> t.y; }
};
vector<int> convex_hull(const vector<Vec>& ps) {
const int n = ps.size();
if (n <= 1) {
if (n == 0) return {};
else return {0};
}
vector<int> ord(n);
iota(ord.begin(), ord.end(), 0);
sort(ord.begin(), ord.end(), [&](int i, int j) {
return ps[i].y < ps[j].y || (ps[i].y == ps[j].y && ps[i].x < ps[j].x);
});
vector<int> st1, st2;
for(int i: ord) {
int sz = st1.size();
while(sz >= 2 && (ps[st1[sz - 1]] - ps[st1[sz - 2]]) * (ps[i] - ps[st1[sz - 1]]) <= 0) {
st1.pop_back();
sz--;
}
st1.push_back(i);
}
for(int i: ord) {
int sz = st2.size();
while(sz >= 2 && (ps[st2[sz - 1]] - ps[st2[sz - 2]]) * (ps[i] - ps[st2[sz - 1]]) >= 0) {
st2.pop_back();
sz--;
}
st2.push_back(i);
}
assert(st1.front() == st2.front() && st1.back() == st2.back());
st1.insert(st1.end(), st2.rbegin() + 1, st2.rend() - 1);
return st1;
}
} int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n, k;
cin >> n >> k;
vector<Vec> p1, p2, p(n);
VI c(n);
rep(i, n) {
cin >> p[i] >> c[i];
(c[i] == 1 ? p1 : p2).emplace_back(p[i]);
}
if (p1.empty() || p2.empty()) {
cout << "No\n";
return 0;
}
bool ok = false;
{
vector<pair<pair<Vec, ll>, int>> d;
rep(i, n) rep(j, i) {
Vec v = (p[i] - p[j]).normalize();
ll h = v.rot90().dot(p[i]);
d.emplace_back(pair(v, h), i);
d.emplace_back(pair(v, h), j);
}
sort(all(d));
int sz = d.size();
VI idx;
for(int l = 0; l < sz;) {
int r = l + 1;
while(r < sz && d[r].first == d[l].first) r++;
idx.clear();
for(int i = l; i < r; i++) idx.emplace_back(d[i].second);
Vec v = d[l].first.first;
sort(all(idx), [&](int i, int j) {
return v * p[i] < v * p[j];
});
int cnt = 0;
int last = -1;
for(int i: idx) if (c[i] != last) {
cnt++;
last = c[i];
}
if (cnt >= 3) {
ok = true;
break;
}
l = r;
}
}
if (!ok && k >= 4) {
VI ch1 = convex_hull(p1), ch2 = convex_hull(p2);
rep(_, 2) {
if (int sz = ch1.size(); sz >= 2) {
ch1.emplace_back(ch1[0]);
for(Vec v: p2) {
int cnt = 0;
rep(i, sz) cnt += Vec::intersects(v, Vec{v.x + 1, 1001001001}, p1[ch1[i]], p1[ch1[i + 1]]);
if (cnt % 2 == 1) {
ok = true;
break;
}
}
}
if (ok) break;
swap(p1, p2);
swap(ch1, ch2);
}
if (!ok) {
int sz1 = ch1.size(), sz2 = ch2.size();
if (sz1 >= 2 && sz2 >= 2) {
sz1--, sz2--;
rep(i, sz1) {
rep(j, sz2) {
if (Vec::intersects(p1[ch1[i]], p1[ch1[i + 1]], p2[ch2[j]], p2[ch2[j + 1]])) {
ok = true;
break;
}
}
if (ok) break;
}
}
}
}
cout << (ok ? "Yes\n" : "No\n");
}
Kude