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This problem can be found in Leetcode: leetcode.com/problems/valid-mounta...

My approach with test case:

class Solution: def validMountainArray(self, arr: List[int]) -> bool: peak_found = False for i in range(1, len(arr)): if arr[i] == arr[i-1]: return False if arr[i] < arr[i-1]: if peak_found == False: if i == 1: return False else: peak_found = True else: if peak_found == True: return False return peak_found if __name__ == "__main__": solution = Solution() test_case = [0, 2, 3, 4, 5, 2, 1, 0] accepted_result = True result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [0, 2, 3, 3, 5, 2, 1, 0] accepted_result = False result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [0, 1, 2, 3, 2, 1] accepted_result = True result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [0, 2, 3, 4, 5, 2, 1, 5, 4, 1] accepted_result = False result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [0, 2, 3, 4, 5, 2, 1, 3, 2, 1] accepted_result = False result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [0, 2, 1] accepted_result = True result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [0, 2, 3] accepted_result = False result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result) test_case = [5, 2, 1] accepted_result = False result = solution.validMountainArray(test_case) assert result == accepted_result, (test_case, accepted_result, result)

Aren't the last two test cases wrong? The expected answer on leetcode returns false and not true. I am trying to solve this now!

@gabriel , yes you are right. I did not notice about the leetcode problem. I have updated the old answer.

Thank you for finding the bug.

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This problem can be found in Leetcode: leetcode.com/problems/valid-mounta...

My approach with test case:

Aren't the last two test cases wrong? The expected answer on leetcode returns false and not true. I am trying to solve this now!

@gabriel , yes you are right. I did not notice about the leetcode problem. I have updated the old answer.

Thank you for finding the bug.