Create minimum-levels-to-gain-more-points.py

Author: kamyu104

Python/minimum-levels-to-gain-more-points.py

@@ -0,0 +1,14 @@
+# Time:  O(n)
+# Space: O(n)
+
+# prefix sum
+class Solution(object):
+    def minimumLevels(self, possible):
+        """
+        :type possible: List[int]
+        :rtype: int
+        """
+        prefix = [0]*(len(possible)+1)
+        for i in xrange(len(possible)):
+            prefix[i+1] = prefix[i]+(+1 if possible[i] else -1)
+        return next((i+1 for i in xrange(len(possible)-1) if prefix[i+1] > prefix[-1]-prefix[i+1]), -1)