20201221

20201221/main.go

@@ -0,0 +1,25 @@
+package main
+
+func main() {
+
+}
+
+func isMountain(nums []int) bool {
+	hasUp := false
+	hasDown := false
+	c := nums[0]
+	for i := 0; i < len(nums); i++ {
+		n := nums[i]
+		if !hasUp && !hasDown && n > c {
+			hasUp = true
+		}
+		if c > n {
+			hasDown = true
+		}
+		if n > c && hasDown {
+			return false
+		}
+		c = n
+	}
+	return hasDown && hasUp
+}