Update k-empty-slots.py

Author: kamyu104

Python/k-empty-slots.py

@@ -1,6 +1,37 @@
 # Time:  O(n)
 # Space: O(n)
 
+# There is a garden with N slots. In each slot, there is a flower.
+# The N flowers will bloom one by one in N days. In each day,
+# there will be exactly one flower blooming and it will be in the status of blooming since then.
+#
+# Given an array flowers consists of number from 1 to N.
+# Each number in the array represents the place where the flower will open in that day.
+#
+# For example, flowers[i] = x means that the unique flower that blooms at day i
+# will be at position x, where i and x will be in the range from 1 to N.
+#
+# Also given an integer k, you need to output in which day there exists two flowers
+# in the status of blooming, and also the number of flowers between them is k and
+# these flowers are not blooming.
+#
+# If there isn't such day, output -1.
+#
+# Example 1:
+# Input: 
+# flowers: [1,3,2]
+# k: 1
+# Output: 2
+# Explanation: In the second day, the first and the third flower have become blooming.
+#
+# Example 2:
+# Input: 
+# flowers: [1,2,3]
+# k: 1
+# Output: -1
+# Note:
+# The given array will be in the range [1, 20000].
+
 class Solution(object):
     def kEmptySlots(self, flowers, k):
         """