From a0030873dabb517594ae0394350d6715071f7fb8 Mon Sep 17 00:00:00 2001 From: Jack Sangdahl Date: Sun, 2 Feb 2025 22:27:19 -0700 Subject: 3105. longest strictly increasing or strictly decreasing subarray --- long_strictly_incr_decr_subarr.c | 26 ++++++++++++++++++++++++++ long_strictly_incr_decr_subarr.py | 29 +++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+) create mode 100644 long_strictly_incr_decr_subarr.c create mode 100644 long_strictly_incr_decr_subarr.py diff --git a/long_strictly_incr_decr_subarr.c b/long_strictly_incr_decr_subarr.c new file mode 100644 index 0000000..9348541 --- /dev/null +++ b/long_strictly_incr_decr_subarr.c @@ -0,0 +1,26 @@ +// 3105. Longest Strictly Increasing or Strictly Decreasing Subarray +#include "leetcode.h" + +/* + * you are given an array of integers 'nums'. return the legnth of the longest + * subarray of 'nums' which is either strictly increasing or strictly + * decreasing. + */ + +int longestMonotonicSubarray(int *nums, int numsSize) { + int ans = 1, inc = 1, dec = 1; + for (int i = 1; i < numsSize; i++) { + bool a = nums[i] > nums[i - 1], b = nums[i] < nums[i - 1]; + inc = a * inc + 1; + dec = b * dec + 1; + ans = fmax(ans, fmax(inc, dec)); + } + return ans; +} + +int main() { + int n1[] = {1, 4, 3, 3, 2}, n2[] = {3, 3, 3, 3}, n3[] = {3, 2, 1}; + printf("%d\n", longestMonotonicSubarray(n1, ARRAY_SIZE(n1))); // expect: 2 + printf("%d\n", longestMonotonicSubarray(n2, ARRAY_SIZE(n2))); // expect: 1 + printf("%d\n", longestMonotonicSubarray(n3, ARRAY_SIZE(n3))); // expect: 3 +} diff --git a/long_strictly_incr_decr_subarr.py b/long_strictly_incr_decr_subarr.py new file mode 100644 index 0000000..108392e --- /dev/null +++ b/long_strictly_incr_decr_subarr.py @@ -0,0 +1,29 @@ +# 3105. Longest Strictly Increasing or Strictly Decreasing Subarray + +""" +you are given an array of integers 'nums'. return the legnth of the longest +subarray of 'nums' which is either strictly increasing or strictly +decreasing. +""" + + +class Solution(object): + def longestMonotonicSubarray(self, nums): + """ + :type nums: List[int] + :rtype: int + """ + n, ans, inc, dec = len(nums), 1, 1, 1 + for i in range(1, n): + a, b = nums[i] > nums[i - 1], nums[i] < nums[i - 1] + inc = a * inc + 1 + dec = b * dec + 1 + ans = max(ans, dec, inc) + return ans + + +if __name__ == "__main__": + obj = Solution() + print(obj.longestMonotonicSubarray(nums=[1, 4, 3, 3, 2])) + print(obj.longestMonotonicSubarray(nums=[3, 3, 3, 3])) + print(obj.longestMonotonicSubarray(nums=[3, 2, 1])) -- cgit v1.2.3