Create maximalSquare.py

Author: kanglicheng

Kangli/DP/maximalSquare.py

@@ -0,0 +1,13 @@
+class Solution(object):
+    def maximalSquare(self, matrix):
+        if not matrix: 
+            return 0
+        m , n = len(matrix),len(matrix[0])
+        dp = [[0 if matrix[i][j]=='0' else 1 for j in xrange(n)]for i in xrange(m)]
+        for i in range(1, len(matrix)):
+            for j in range(1, len(matrix[0])):
+                if matrix[i][j] == '1':
+                    dp[i][j] = 1 + int(min(dp[i-1][j-1], dp[i-1][j], dp[i][j-1]))
+        maxEdge = max(max(row) for row in dp)
+        return maxEdge**2 
+