結果
| 問題 |
No.424 立体迷路
|
| コンテスト | |
| ユーザー |
くれちー
|
| 提出日時 | 2017-07-20 20:45:08 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 23 ms / 2,000 ms |
| コード長 | 4,115 bytes |
| コンパイル時間 | 803 ms |
| コンパイル使用メモリ | 111,744 KB |
| 実行使用メモリ | 19,200 KB |
| 最終ジャッジ日時 | 2024-07-05 07:14:36 |
| 合計ジャッジ時間 | 2,072 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 5 |
| other | AC * 21 |
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc) Copyright (C) Microsoft Corporation. All rights reserved.
ソースコード
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using static System.Console;
using static System.Convert;
using static System.Math;
using static Extentions;
class IO
{
int idx;
string[] input;
public IO(TextReader reader)
{
input = reader.ReadToEnd().Split(new[] { " ", Environment.NewLine },
StringSplitOptions.RemoveEmptyEntries);
}
T Get<T>(Func<string, T> parser) => parser(input[idx++]);
public string S => Get(s => s);
public char C => Get(char.Parse);
public int I => Get(int.Parse);
public long L => Get(long.Parse);
public double F => Get(double.Parse);
public decimal D => Get(decimal.Parse);
public BigInteger B => Get(BigInteger.Parse);
T[] Gets<T>(int n, Func<string, T> parser)
=> input.Skip((idx += n) - n).Take(n).Select(parser).ToArray();
public string[] Ss(int n) => Gets(n, s => s);
public char[] Cs(int n) => Gets(n, char.Parse);
public int[] Is(int n) => Gets(n, int.Parse);
public long[] Ls(int n) => Gets(n, long.Parse);
public double[] Fs(int n) => Gets(n, double.Parse);
public decimal[] Ds(int n) => Gets(n, decimal.Parse);
public BigInteger[] Bs(int n) => Gets(n, BigInteger.Parse);
public void Write<T>(params T[] xs) => WriteLine(string.Join(" ", xs));
public void Write(params object[] xs) => WriteLine(string.Join(" ", xs));
}
class UnionFind
{
int[] tree;
public int CountGroups => tree.Count(x => x < 0);
public UnionFind(int length)
{
tree = Enumerable.Repeat(-1, length).ToArray();
}
public bool Union(int x, int y)
{
x = this.Find(x);
y = this.Find(y);
if (x == y) return false;
if (tree[x] > tree[y]) Swap(ref x, ref y);
tree[x] += tree[y];
tree[y] = x;
return true;
}
public int Find(int x)
{
if (tree[x] < 0) return x;
return tree[x] = this.Find(tree[x]);
}
public bool IsSameGroup(int x, int y) => this.Find(x) == this.Find(y);
}
static class Extentions
{
public static void Swap<T>(ref T x, ref T y)
{
var tmp = x;
x = y;
y = tmp;
}
}
static class Program
{
public static void Main()
{
#if !DEBUG
SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
#endif
Solve(new IO(In));
Out.Flush();
}
static void Solve(IO io)
{
var h = io.I;
var w = io.I;
var sp = Encode(io.I - 1, io.I - 1);
var gp = Encode(io.I - 1, io.I - 1);
var b = new int[h, w];
var uf = new UnionFind(5050);
for (var i = 0; i < h; i++)
{
var s = io.S;
for (var j = 0; j < w; j++) b[i, j] = s[j] - '0';
}
for (var i = 0; i < h; i++)
{
for (var j = 0; j < w; j++)
{
if (j == 0) continue;
var p1 = Encode(i, j - 1);
var p2 = Encode(i, j);
if (CanMove(b[i, j - 1], b[i, j])) uf.Union(p1, p2);
if (j == w - 1) continue;
var p3 = Encode(i, j + 1);
if (CanMove(b[i, j - 1], b[i, j], b[i, j + 1])) uf.Union(p1, p3);
}
}
for (var j = 0; j < w; j++)
{
for (var i = 0; i < h; i++)
{
if (i == 0) continue;
var p1 = Encode(i - 1, j);
var p2 = Encode(i, j);
if (CanMove(b[i - 1, j], b[i, j])) uf.Union(p1, p2);
if (i == h - 1) continue;
var p3 = Encode(i + 1, j);
if (CanMove(b[i - 1, j], b[i, j], b[i + 1, j])) uf.Union(p1, p3);
}
}
if (uf.IsSameGroup(sp, gp)) io.Write("YES");
else io.Write("NO");
}
static int Encode(int x, int y) => x * 100 + y;
static bool CanMove(int h1, int h2) => Abs(h1 - h2) <= 1;
static bool CanMove(int h1, int h2, int h3) => h1 == h3 && h2 <= h1;
}
くれちー