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+// 2016. Maximum Difference Between Increasing Elements
+#include "leetcode.h"
+
+/*
+ * given a 0-indexed integer array 'nums' of size 'n', find the maximum
+ * difference between 'nums[i]' and 'nums[j]' (ie. 'nums[j] - nums[i]') such
+ * that '0 <= i < j < n' and 'nums[i] < nums[j]'. return the maximum difference.
+ * if no such 'i' and 'j' exist, return -1
+ */
+
+int maximumDifference(int *nums, int numsSize) {
+ int min = nums[0], ans = -1;
+ for (int i = 1; i < numsSize; ++i) {
+ ans = fmax(ans, nums[i] - min);
+ min = fmin(min, nums[i]);
+ }
+ return ans;
+}
+
+int main() {
+ int n1[] = {7, 1, 5, 4}, n2[] = {9, 4, 3, 2}, n3[] = {1, 5, 2, 10};
+ printf("%d\n", maximumDifference(n1, ARRAY_SIZE(n1))); // expect: 4
+ printf("%d\n", maximumDifference(n2, ARRAY_SIZE(n2))); // expect: -1
+ printf("%d\n", maximumDifference(n3, ARRAY_SIZE(n3))); // expect: 9
+}