How to Solve Frog Jump Problem
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Frog Jump
A frog is crossing a river. The river is divided into some number of units, and at each unit, there may or may not exist a stone. The frog can jump on a stone, but it must not jump into the water. Giv...
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Understanding the Frog Jump Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
A frog is crossing a river. The river is divided into some number of units, and at each unit, there may or may not exist a stone. The frog can jump on a stone, but it must not jump into the water. Given a list of stones positions (in units) in sorted ascending order, determine if the frog can cross the river by landing on the last stone. Initially, the frog is on the first stone and assumes the first jump must be 1 unit. If the frog's last jump was k units, its next jump must be either k - 1, k, or k + 1 units. The frog can only jump in the forward direction.
Frog Jump
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Examples
stones = [0,1,3,5,6,8,12,17]trueThe frog can jump to the last stone by jumping 1 unit to the 2nd stone, then 2 units to the 3rd stone, then 2 units to the 4th stone, then 3 units to the 6th stone, 4 units to the 7th stone, and 5 units to the 8th stone.
stones = [0,1,2,3,4,8,9,11]falseThere is no way to jump to the last stone as the gap between the 5th and 6th stone is too large.
Constraints
2 <= stones.length <= 20000 <= stones[i] <= 231 - 1stones[0] == 0stones is sorted in a strictly increasing order.How Interview Coder Helps with Leetcode Problems
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Frequently Asked Questions
Common questions about solving Frog Jump and using Interview Coder during coding interviews.
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