Valid Mountain Array — LeetCode
Step-by-step algorithm visualization for LeetCode #941 (Valid Mountain Array). The solution uses a two-pointer approach to climb from the left until the peak and descend from the right until the valley, verifying that both pointers meet at the same peak index with strict increases and decreases on each side.
Complexity Analysis:
Time Complexity: O(n) — where n is the length of the array. Each element is traversed at most once by the two pointers.
Space Complexity: O(1) — only constant extra space is used for pointer variables.
Timestamps:
0:00 — Problem Setup & Edge Case Check
0:09 — Climbing the Left Slope
0:22 — Peak Validation
0:23 — Descending the Right Slope
0:37 — Result
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