add week 4 solution

Author: tedkimdev

find-minimum-in-rotated-sorted-array/tedkimdev.go

@@ -0,0 +1,26 @@
+// TC: O(log n)
+// SC: O(1)
+func findMin(nums []int) int {
+	min := nums[0]
+	l, r := 0, len(nums)-1
+
+	for l <= r {
+			if nums[l] < min {
+				min = nums[l]
+			}
+			break
+		}
+
+		m := l + (r-l)/2
+		if nums[m] < min {
+			min = nums[m]
+		}
+
+		if nums[m] >= nums[l] {
+			l = m + 1
+		} else {
+			r = m - 1
+		}
+	}
+	return min
+}