Package g1001_1100.s1036_escape_a_large_maze

Class Solution

java.lang.Object

g1001_1100.s1036_escape_a_large_maze.Solution

public class Solution
extends Object

1036 - Escape a Large Maze.<p>Hard</p> <p>There is a 1 million by 1 million grid on an XY-plane, and the coordinates of each grid square are <code>(x, y)</code>.</p> <p>We start at the <code>source = [s_x, s_y]</code> square and want to reach the <code>target = [t_x, t_y]</code> square. There is also an array of <code>blocked</code> squares, where each <code>blocked[i] = [x_i, y_i]</code> represents a blocked square with coordinates <code>(x_i, y_i)</code>.</p> <p>Each move, we can walk one square north, east, south, or west if the square is <strong>not</strong> in the array of <code>blocked</code> squares. We are also not allowed to walk outside of the grid.</p> <p>Return <code>true</code> <em>if and only if it is possible to reach the</em> <code>target</code> <em>square from the</em> <code>source</code> <em>square through a sequence of valid moves</em>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> blocked = [[0,1],[1,0]], source = [0,0], target = [0,2]</p> <p><strong>Output:</strong> false</p> <p><strong>Explanation:</strong> The target square is inaccessible starting from the source square because we cannot move.</p> <p>We cannot move north or east because those squares are blocked.</p> <p>We cannot move south or west because we cannot go outside of the grid.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> blocked = [], source = [0,0], target = [999999,999999]</p> <p><strong>Output:</strong> true</p> <p><strong>Explanation:</strong> Because there are no blocked cells, it is possible to reach the target square.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>0 <= blocked.length <= 200</code></li> <li><code>blocked[i].length == 2</code></li> <li><code>0 <= x_i, y_i < 10⁶</code></li> <li><code>source.length == target.length == 2</code></li> <li><code>0 <= s_x, s_y, t_x, t_y < 10⁶</code></li> <li><code>source != target</code></li> <li>It is guaranteed that <code>source</code> and <code>target</code> are not blocked.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	isEscapePossible(int[][] blocked, int[] source, int[] target)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

isEscapePossible

public boolean isEscapePossible(int[][] blocked,
 int[] source,
 int[] target)