제출 #569212

#제출 시각아이디문제언어결과실행 시간메모리
569212ngpin04자리 배치 (IOI18_seats)C++17
11 / 100
4085 ms102456 KiB
#include "seats.h" #include <bits/stdc++.h> #define fi first #define se second #define mp make_pair #define TASK "" #define bit(x) (1LL << (x)) #define getbit(x, i) (((x) >> (i)) & 1) #define ALL(x) (x).begin(), (x).end() using namespace std; template <typename T1, typename T2> bool mini(T1 &a, T2 b) { if (a > b) {a = b; return true;} return false; } template <typename T1, typename T2> bool maxi(T1 &a, T2 b) { if (a < b) {a = b; return true;} return false; } mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count()); int rand(int l, int r) { return l + rd() % (r - l + 1); } const int N = 1e6 + 5; const int oo = 1e9; const long long ooo = 1e18; const int mod = 1e9 + 7; // 998244353; const long double pi = acos(-1); typedef tuple <int, int, int, int> pir; pir add(pir a, pir b) { auto [minx1, maxx1, miny1, maxy1] = a; auto [minx2, maxx2, miny2, maxy2] = b; return { min(minx1, minx2), max(maxx1, maxx2), min(miny1, miny2), max(maxy1, maxy2) }; } struct segtree { int n; vector <pir> st; segtree(int _n = 0) { n = _n; st.resize(4 * n + 5); } void update(int id, int l, int r, int pos, int x, int y) { if (l > pos || r < pos) return; if (l == r) { st[id] = {x, x, y, y}; return; } int mid = (l + r) >> 1; update(id << 1, l, mid, pos, x, y); update(id << 1 | 1, mid + 1, r, pos, x, y); st[id] = add(st[id << 1], st[id << 1 | 1]); } void update(int pos, int x, int y) { update(1, 0, n - 1, pos, x, y); } pir getval(int id, int l, int r, int u, int v) { if (l > v || r < u) return {oo, -oo, oo, -oo}; if (l >= u && r <= v) return st[id]; int mid = (l + r) >> 1; auto lnode = getval(id << 1, l, mid, u, v); auto rnode = getval(id << 1 | 1, mid + 1, r, u, v); return add(lnode, rnode); } pir getval(int l, int r) { return getval(1, 0, n - 1, l, r); } }; segtree seg; int x[N]; int y[N]; int n,m; void give_initial_chart(int H, int W, vector<int> R, vector<int> C) { n = H; m = W; seg = segtree(n * m); for (int i = 0; i < n * m; i++) { x[i] = R[i], y[i] = C[i]; seg.update(i, x[i], y[i]); } } int brute() { int ans = 0; int minx = oo, miny = oo, maxx = -oo, maxy = -oo; for (int i = 0; i < n * m; i++) { mini(minx, x[i]); maxi(maxx, x[i]); mini(miny, y[i]); maxi(maxy, y[i]); int dx = maxx - minx + 1; int dy = maxy - miny + 1; ans += (dx * dy == i + 1); } return ans; } int sub2() { int res = 1; pair <int, int> rx = {x[0], x[0]}, ry{y[0], y[0]}; int cur = 0; while (cur < n * m - 1) { int dx = rx.se - rx.fi + 1; int dy = ry.se - ry.fi + 1; // cerr << cur << " " << dx << " " << dy << "\n"; int cnt = dx * dy; int t = 0; if (cnt == cur + 1) { int d = min(dx, dy); t = cur + d; res++; } else { t = cnt - 1; } cur = t; auto [l, r, u, v] = seg.getval(0, t); rx = {l, r}; ry = {u, v}; } return res; } int swap_seats(int a, int b) { swap(x[a], x[b]); swap(y[a], y[b]); seg.update(a, x[a], y[a]); seg.update(b, x[b], y[b]); if (n * m <= 10000) return brute(); if (max(n, m) <= 1000) return sub2(); return -1; } //#include "grader.cpp"
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