Submission #1045663

#	Time	Username	Problem	Language	Result	Execution time	Memory
1045663		Tsovak	Toy (CEOI24_toy)	C++17	0 / 100	36 ms	63076 KiB

Main

// -------------------- Includes -------------------- //
#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <stdio.h>
#include <cstdlib>
#include <stdlib.h>
#include <array>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <math.h>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <tuple>
#include <utility>
#include <cassert>
#include <assert.h>
#include <climits>
#include <limits.h>
#include <ctime>
#include <time.h>
#include <random>
#include <chrono>
#include <fstream>
using namespace std;

// -------------------- Typedefs -------------------- //

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;

// -------------------- Defines -------------------- //

#define pr pair
#define mpr make_pair
#define ff first
#define ss second

#define mset multiset
#define mmap multimap
#define uset unordered_set
#define umap unordered_map
#define umset unordered_multiset
#define ummap unordered_multimap
#define pqueue priority_queue

#define sz(x) (int((x).size()))
#define len(x) (int((x).length()))
#define all(x) (x).begin(), (x).end()
#define clr(x) (x).clear()

#define ft front
#define bk back
#define pf push_front
#define pb push_back
#define popf pop_front
#define popb pop_back

#define lb lower_bound
#define ub upper_bound
#define bs binary_search

// -------------------- Constants -------------------- //

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18 + 5);
const ll MOD = ll(1e9 + 7);
const ll MOD2 = ll(998244353);

// -------------------- Functions -------------------- //

void fastio()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	return;
}

void precision(int x)
{
	cout << fixed << setprecision(x);
	return;
}

ll gcd0(ll a, ll b)
{
	while (b) {
		a %= b;
		swap(a, b);
	}
	return a;
}

ll lcm0(ll a, ll b)
{
	return a / gcd0(a, b) * b;
}

bool is_prime(ll a)
{
	if (a == 1) return false;
	for (ll i = 2; i * i <= a; i++) if (a % i == 0) return false;
	return true;
}

bool is_square(ll a)
{
	ll b = ll(sqrtl(ld(a)));
	return (b * b == a);
}

bool is_cube(ll a)
{
	ll b = ll(cbrtl(ld(a)));
	return (b * b * b == a);
}

int digit_sum(ll a)
{
	int sum = 0;
	while (a) {
		sum += int(a % 10);
		a /= 10;
	}
	return sum;
}

ll binpow(ll a, int b)
{
	ll ans = 1;
	while (b) {
		if (b & 1) ans *= a;
		b >>= 1;
		a *= a;
	}
	return ans;
}

ll binpow_mod(ll a, ll b, ll mod)
{
	ll ans = 1;
	while (b) {
		if (b & 1) ans = (ans * a) % mod;
		b >>= 1;
		a = (a * a) % mod;
	}
	return ans;
}

ll factorial(int a)
{
	ll ans = 1;
	for (int i = 2; i <= a; i++) ans *= ll(i);
	return ans;
}

ll factorial_mod(int a, ll mod)
{
	ll ans = 1;
	for (int i = 2; i <= a; i++) ans = (ans * ll(i)) % mod;
	return ans;
}

// -------------------- Solution -------------------- //

const int N = 1505, M = 1505;
char a[N][M];
int px[N], py[M];
vector<pr<int, int>> g[N][M];
int n, m, k, l;
int xh, yh, xv, yv, tx, ty;

vector<int> vx[N], vy[M];

bool used[N][M];

void dfs(int x, int y)
{
	if (a[x][y] == 'X') return;

	used[x][y] = true;

	for (int i = 0; i < sz(g[x][y]); i++) {
		if (!used[g[x][y][i].ff][g[x][y][i].ss]) dfs(g[x][y][i].ff, g[x][y][i].ss);
	}

	return;
}

void solve()
{
	int i, j;

	cin >> m >> n >> k >> l;
	cin >> yh >> xh >> yv >> xv;

	for (i = 1; i <= n; i++) {
		for (j = 1; j <= m; j++) {
			cin >> a[i][j];

			if (a[i][j] == '*') {
				tx = i;
				ty = j;
			}
			else if (a[i][j] == 'X') {
				vx[i].pb(j);
				vy[j].pb(i);
			}
		}
	}

	for (j = 1; j <= m; j++) sort(all(vy[j]));

	int h, cnt;
	int lx, rx, ly, ry;

	for (i = 1; i <= n; i++) {
		for (j = 1; j <= m; j++) {
			if (a[i][j] == 'X') continue;

			h = ub(all(vy[j]), i) - vy[j].begin();

			if (h == sz(vy[j])) rx = n;
			else rx = vy[j][h];
			rx = min(rx, i + l - 1);

			h--;
			if (h < 0) lx = 1;
			else lx = vy[j][h];
			lx = max(lx, i - l + 1);


			h = ub(all(vx[i]), j) - vx[i].begin();

			if (h == sz(vx[i])) ry = m;
			else ry = vx[i][h];
			ry = min(ry, j + k - 1);

			h--;
			if (h < 0) ly = 1;
			else ly = vx[i][h];
			ly = max(ly, j - k + 1);


			if (l > rx - lx + 1 || k > ry - ly + 1) continue;

			if (i < n && rx >= i + 1 && a[i + 1][j] != 'X') {
				cnt = 0;

				for (h = ly; h <= ry; h++) {
					if (a[i + 1][h] == 'X') cnt = 0;
					else cnt++;

					if (cnt >= k) {
						g[i][j].pb(mpr(i + 1, j));
						g[i + 1][j].pb(mpr(i, j));

						break;
					}
				}
			}

			if (j < m && ry >= j + 1 && a[i][j + 1] != 'X') {
				cnt = 0;

				for (h = lx; h <= rx; h++) {
					if (a[h][j + 1] == 'X') cnt = 0;
					else cnt++;

					if (cnt >= l) {
						g[i][j].pb(mpr(i, j + 1));
						g[i][j + 1].pb(mpr(i, j));

						break;
					}
				}
			}
		}
	}

	dfs(xh + 1, yv + 1);

	if (used[tx][ty]) cout << "YES\n";
	else cout << "NO\n";

	return;
}

void precalc()
{
	return;
}

int main()
{
	fastio();

	precalc();

	int tests = 1, tc;
	//cin >> tests;
	for (tc = 1; tc <= tests; tc++) {
		solve();
	}

	return 0;
}

/*
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*/

• Subtask 0: 0 / 0
• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 9
• Subtask 4: 0 / 29
• Subtask 5: 0 / 27