Create Maximal Square

Author: HarryWangATX

Maximal Square

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+class Solution {
+    public int maximalSquare(char[][] matrix) {
+        if(matrix == null ||matrix.length == 0 ) return 0;
+        int m = matrix.length;
+        int n = matrix[0].length;
+
+        int[][] dp = new int[m+1][n+1];
+        int maxLen = 0;
+        int prev =0;
+        for(int i=1; i <= m ; i++){
+            for(int j =1 ; j <=n ; j++){
+                if(matrix[i-1][j-1] == '1'){
+                    dp[i][j] = Math.min(dp[i-1][j], Math.min(dp[i][j-1], dp[i-1][j-1])) +1;
+                    maxLen = Math.max(maxLen, dp[i][j]);
+                }else{
+                    dp[i][j] = 0; 
+                }
+            }
+        }
+        //System.out.println(Arrays.deepToString(dp));
+        return maxLen * maxLen;
+    }
+}