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-rw-r--r--shortest_subarr_remove_sort.c37
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diff --git a/shortest_subarr_remove_sort.c b/shortest_subarr_remove_sort.c
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+// 1574. Shortest Subarray to be Removed to Make Array Sorted
+#include "leetcode.h"
+
+/*
+ * given an integer array 'arr', remove a subarray (can be empty) from 'arr'
+ * such that the remaining elements in 'arr' are non-decreasing. return the
+ * length of the shortest subarray to remove. a subarray is a contiguous
+ * subsequence of the array.
+ */
+
+int findLengthOfShortestSubarray(int *arr, int arrSize) {
+ int left = 0, right = arrSize - 1;
+ while (left + 1 < arrSize && arr[left] <= arr[left + 1])
+ left++;
+ if (left == arrSize - 1)
+ return 0;
+ while (right > left && arr[right - 1] <= arr[right])
+ right--;
+ int ans = arrSize - left - 1 < right ? arrSize - left - 1 : right;
+ int i = 0, j = right;
+ while (i <= left && j < arrSize) {
+ if (arr[j] >= arr[i]) {
+ ans = ans < j - i - 1 ? ans : j - i - 1;
+ i++;
+ } else
+ j++;
+ }
+ return ans;
+}
+
+int main() {
+ int a1[] = {1, 2, 3, 10, 4, 2, 3, 5}, a2[] = {5, 4, 3, 2, 1},
+ a3[] = {1, 2, 3};
+ printf("%d\n", findLengthOfShortestSubarray(a1, ARRAY_SIZE(a1))); // expect: 3
+ printf("%d\n", findLengthOfShortestSubarray(a2, ARRAY_SIZE(a2))); // expect: 4
+ printf("%d\n", findLengthOfShortestSubarray(a3, ARRAY_SIZE(a3))); // expect: 0
+}