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Grokking the Coding Interview Patterns in C#

Solution: Swim in Rising Water

Explore a matrix-based solution for the Swim in Rising Water problem, where you learn to apply a greedy, Dijkstra-inspired algorithm. Understand how to use a min heap to navigate elevations and find the earliest time to swim from the top-left to the bottom-right of a grid as water rises.

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Statement

Given an n×nn \times n grid (2D matrix) where each cell grid[i][j] represents the elevation at position (i, j).

Once it starts to rain, the water level rises over time. At any given time t, the water depth across the grid equals t. A swimmer can move from one cell to an adjacent cell (up, down, left, or right) if both cells have elevations less than or equal to the current water level t.

If the elevation condition ...