Candy

Author: gavinfish

135 Candy.py

@@ -0,0 +1,29 @@
+'''
+There are N children standing in a line. Each child is assigned a rating value.
+
+You are giving candies to these children subjected to the following requirements:
+
+Each child must have at least one candy.
+Children with a higher rating get more candies than their neighbors.
+What is the minimum candies you must give?
+'''
+
+class Solution(object):
+    def candy(self, ratings):
+        """
+        :type ratings: List[int]
+        :rtype: int
+        """
+        n = len(ratings)
+        candy = [1] * n
+        for i in range(1, n):
+            if ratings[i] > ratings[i - 1]:
+                candy[i] = candy[i - 1] + 1
+        for i in range(n - 2, -1, -1):
+            if ratings[i] > ratings[i + 1]:
+                candy[i] = max(candy[i], candy[i + 1] + 1)
+        return sum(candy)
+
+
+if __name__ == "__main__":
+    assert Solution().candy([1, 2, 3, 7, 4, 3, 2, 1]) == 21