Package g1201_1300.s1277_count_square_submatrices_with_all_ones

Class Solution

java.lang.Object
g1201_1300.s1277_count_square_submatrices_with_all_ones.Solution
public class Solution extends java.lang.Object
1277 - Count Square Submatrices with All Ones.

Medium

Given a m * n matrix of ones and zeros, return how many square submatrices have all ones.

Example 1:

Input: matrix = [ [0,1,1,1], [1,1,1,1], [0,1,1,1] ]

Output: 15

Explanation:

There are 10 squares of side 1.

There are 4 squares of side 2.

There is 1 square of side 3.

Total number of squares = 10 + 4 + 1 = 15.

Example 2:

Input: matrix = [ [1,0,1], [1,1,0], [1,1,0] ]

Output: 7

Explanation:

There are 6 squares of side 1.

There is 1 square of side 2.

Total number of squares = 6 + 1 = 7.

Constraints:

  • 1 <= arr.length <= 300
  • 1 <= arr[0].length <= 300
  • 0 <= arr[i][j] <= 1

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    countSquares(int[][] matrix)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • countSquares

      public int countSquares(int[][] matrix)