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authorjack <[email protected]>2024-06-14 13:13:15 -0600
committerjack <[email protected]>2024-06-14 13:13:15 -0600
commitd343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa (patch)
tree96df922dae2a5073d9a50ea70c7aae6aa37e3ebe /height_checker.c
downloadleetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.tar.gz
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+// 1051. Height Checker
+#include "leetcode.h"
+
+/*
+ * a school is trying to take an annual photo of all the students. the students
+ * are asked to stand in a single file line in non decreasing order by height.
+ * let this ordering be represented by the integer array 'expected' where
+ * 'expected[i]' is the expected height of the i'th student in line. you are
+ * given an integer array 'heights' representing the current order that the
+ * students are standing in. each 'heights[i]' is the height of the i'th student
+ * in line. return the number of indices where 'heights[i] != expected[i]'
+ */
+
+int cmp(const void *a, const void *b) {
+ long aa = *(int *)a, bb = *(int *)b;
+ return aa - bb;
+}
+
+int heightChecker(int *heights, int heightsSize) {
+ if (heightsSize < 2)
+ return 0;
+ int *expected = (int *)malloc(sizeof(int) * heightsSize);
+ memcpy(expected, heights, sizeof(int) * heightsSize);
+ qsort(expected, heightsSize, sizeof(int), cmp);
+ int diff = 0;
+ for (int i = 0; i < heightsSize; i++)
+ if (heights[i] != expected[i])
+ diff++;
+ free(expected);
+ return diff;
+}
+
+int main() {
+ int h1[] = {1, 1, 4, 2, 1, 3}, h2[] = {5, 1, 2, 3, 4}, h3[] = {1, 2, 3, 4, 5};
+ printf("%d\n", heightChecker(h1, ARRAY_SIZE(h1))); // expect: 3
+ printf("%d\n", heightChecker(h2, ARRAY_SIZE(h2))); // expect: 5
+ printf("%d\n", heightChecker(h3, ARRAY_SIZE(h3))); // expect: 0
+}