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-rw-r--r--type_of_triangle.c36
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+// 3024. Type of Triangle
+#include "leetcode.h"
+
+/*
+ * you are given a 0-indexed integer array 'nums' of size 3 which can form the
+ * sides of a triangle. return a string representing the type of triangle that
+ * can be formed, or none if it cannot form a triangle.
+ */
+
+inline void swap(int *x, int *y) {
+ int tmp = *x;
+ *x = *y;
+ *y = tmp;
+}
+
+char *triangleType(int *nums, int numsSize) {
+ for (int i = 0; i < 2; i++) {
+ if (nums[2] < nums[i])
+ swap(&nums[i], &nums[2]);
+ else if (nums[1] < nums[i])
+ swap(&nums[i], &nums[1]);
+ }
+ if (nums[2] >= nums[0] + nums[1])
+ return "none";
+ if (nums[0] == nums[2])
+ return "equilateral";
+ if (nums[0] == nums[1] || nums[1] == nums[2])
+ return "isosceles";
+ return "scalene";
+}
+
+int main() {
+ int n1[] = {3, 3, 3}, n2[] = {3, 4, 5};
+ printf("%s\n", triangleType(n1, ARRAY_SIZE(n1))); // expect: equilateral
+ printf("%s\n", triangleType(n2, ARRAY_SIZE(n2))); // expect: scalene
+}