Submission #414588

#	Time	Username	Problem	Language	Result	Execution time	Memory
414588		_fractal	Seats (IOI18_seats)	C++17	70 / 100	4070 ms	142700 KiB

seats

#include "seats.h"
#include <iostream>
#include <climits>
#include <algorithm>
using namespace std;
 
#define pb push_back
#define S second
#define F first
 
typedef pair<int, int> pii;
 
const int N = 1e6 + 200;
const int inf = (1 << 30);

const int dx[] = {0, -1, 0, -1};
const int dy[] = {0, 0, -1, -1};
 
int S, ans = 0;
int H, W;
int cur[4];
int **val, **was;
pii pos[N];

struct tree_line {
	int t[N << 2], p[N << 2];
	int cnt[N << 2];

	inline void push(int v, int tl, int tr) {
		if (p[v] != 0) {
			if (tl != tr) {
				p[v * 2] += p[v];
				p[v * 2 + 1] += p[v];
			}
			t[v] += p[v];
			p[v] = 0;
		}
	}

	void build(int v = 1, int tl = 1, int tr = S) {
		cnt[v] = tr - tl + 1;
		if (tl == tr) return;
		int tm = tl + tr >> 1;
		build(v * 2, tl, tm);
		build(v * 2 + 1, tm + 1, tr);
	}

	void upd(int l, int r, int val, int v = 1, int tl = 1, int tr = S) {
		push(v, tl, tr);
		if (r < tl || tr < l || l > r)
			return;
		if (l <= tl && tr <= r) {
			p[v] += val;
			push(v, tl, tr);
			return;
		}
		int tm = tl + tr >> 1;
		upd(l, r, val, v * 2, tl, tm);
		upd(l, r, val, v * 2 + 1, tm + 1, tr);
		t[v] = min(t[v * 2], t[v * 2 + 1]);
		cnt[v] = 0;
		if (t[v] == t[v * 2])
			cnt[v] += cnt[v * 2];
		if (t[v] == t[v * 2 + 1])
			cnt[v] += cnt[v * 2 + 1];
	}

	int get() {
		return cnt[1];
	}
} t;
 
void del(int _x, int _y) {
	for (int j = 0, x, y; j < 4; ++j) {
		x = _x - dx[j];
		y = _y - dy[j];
		if (was[x][y]) continue;
		was[x][y] = 1;
		for (int i = 0; i < 4; ++i)
			cur[i] = val[x + dx[i]][y + dy[i]];
		if (cur[0] > cur[1]) swap(cur[0], cur[1]);
		if (cur[1] > cur[2]) swap(cur[1], cur[2]);
		if (cur[0] > cur[1]) swap(cur[0], cur[1]);
		if (cur[2] > cur[3]) swap(cur[2], cur[3]);
		if (cur[1] > cur[2]) swap(cur[1], cur[2]);
		if (cur[0] > cur[1]) swap(cur[0], cur[1]);
		t.upd(cur[0], cur[1] - 1, -1);
		t.upd(cur[2], cur[3] - 1, -5);
	}
}

void add(int _x, int _y) {
	for (int j = 0, x, y; j < 4; ++j) {
		x = _x - dx[j];
		y = _y - dy[j];
		if (was[x][y]) continue;
		was[x][y] = 1;
		for (int i = 0; i < 4; ++i)
			cur[i] = val[x + dx[i]][y + dy[i]];
		if (cur[0] > cur[1]) swap(cur[0], cur[1]);
		if (cur[1] > cur[2]) swap(cur[1], cur[2]);
		if (cur[0] > cur[1]) swap(cur[0], cur[1]);
		if (cur[2] > cur[3]) swap(cur[2], cur[3]);
		if (cur[1] > cur[2]) swap(cur[1], cur[2]);
		if (cur[0] > cur[1]) swap(cur[0], cur[1]);
		t.upd(cur[0], cur[1] - 1, +1);
		t.upd(cur[2], cur[3] - 1, +5);
	}
}

void clr(int _x, int _y) {
	for (int j = 0, x, y; j < 4; ++j) {
		x = _x - dx[j];
		y = _y - dy[j];
		was[x][y] = 0;
	}
}

void give_initial_chart(int _H, int _W, vector<int> R, vector<int> C) {
	H = _H, W = _W;
	S = H * W;
	val = new int*[H + 5];
	was = new int*[H + 5];
	for (int i = 0; i <= H + 3; ++i) {
		val[i] = new int[W + 5];
		was[i] = new int[W + 5];
	}
	for (int i = 1; i <= S; ++i) {
		C[i - 1]++, R[i - 1]++;
		pos[i] = {R[i - 1], C[i - 1]};
		val[R[i - 1]][C[i - 1]] = i;
	}
	t.build();
	for (int i = 0; i <= W + 1; ++i)
		val[0][i] = val[H + 1][i] = S + 1;
	for (int i = 0; i <= H + 1; ++i)
		val[i][0] = val[i][W + 1] = S + 1;
	for (int i = 1; i <= H + 1; ++i) {
		for (int j = 1; j <= W + 1; ++j) {
			for (int k = 0; k < 4; ++k)
				cur[k] = val[i + dx[k]][j + dy[k]];
			if (cur[0] > cur[1]) swap(cur[0], cur[1]);
			if (cur[1] > cur[2]) swap(cur[1], cur[2]);
			if (cur[0] > cur[1]) swap(cur[0], cur[1]);
			if (cur[2] > cur[3]) swap(cur[2], cur[3]);
			if (cur[1] > cur[2]) swap(cur[1], cur[2]);
			if (cur[0] > cur[1]) swap(cur[0], cur[1]);
			t.upd(cur[0], cur[1] - 1, +1);
			t.upd(cur[2], cur[3] - 1, +5);
		}
	}
	return;
}
 
int swap_seats(int a, int b) {
	++a, ++b;
	del(pos[a].F, pos[a].S);
	del(pos[b].F, pos[b].S);
	clr(pos[a].F, pos[a].S);
	clr(pos[b].F, pos[b].S);
	swap(pos[a], pos[b]);
	val[pos[a].F][pos[a].S] = a;
	val[pos[b].F][pos[b].S] = b;
	add(pos[a].F, pos[a].S);
	add(pos[b].F, pos[b].S);
	clr(pos[a].F, pos[a].S);
	clr(pos[b].F, pos[b].S);
	return t.get();
}

Compilation message (stderr)

seats.cpp: In member function 'void tree_line::build(int, int, int)':
seats.cpp:43:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   43 |   int tm = tl + tr >> 1;
      |            ~~~^~~~
seats.cpp: In member function 'void tree_line::upd(int, int, int, int, int, int)':
seats.cpp:57:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   57 |   int tm = tl + tr >> 1;
      |            ~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 6 / 6
• Subtask 3: 20 / 20
• Subtask 4: 6 / 6
• Subtask 5: 33 / 33
• Subtask 6: 0 / 30