How to Solve Number of Ways to Stay in the Same Place After Some Steps Problem
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Number of Ways to Stay in the Same Place After Some Steps
You have a pointer at index 0 in an array of size arrLen. At each step, you can move 1 position to the left, 1 position to the right in the array, or stay in the same place (The pointer should not be ...
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Problem Statement
You have a pointer at index 0 in an array of size arrLen. At each step, you can move 1 position to the left, 1 position to the right in the array, or stay in the same place (The pointer should not be placed outside the array at any time). Given two integers steps and arrLen, return the number of ways such that your pointer is still at index 0 after exactly steps steps. Since the answer may be too large, return it modulo 109 + 7.
Number of Ways to Stay in the Same Place After Some Steps
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Examples
steps = 3, arrLen = 24There are 4 differents ways to stay at index 0 after 3 steps. Right, Left, Stay Stay, Right, Left Right, Stay, Left Stay, Stay, Stay
steps = 2, arrLen = 42There are 2 differents ways to stay at index 0 after 2 steps Right, Left Stay, Stay
steps = 4, arrLen = 28Constraints
1 <= steps <= 5001 <= arrLen <= 106How Interview Coder Helps with Leetcode Problems
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