Package g1001_1100.s1074_number_of_submatrices_that_sum_to_target

Class Solution

java.lang.Object

g1001_1100.s1074_number_of_submatrices_that_sum_to_target.Solution

public class Solution
extends Object

1074 - Number of Submatrices That Sum to Target\. Hard Given a `matrix` and a `target`, return the number of non-empty submatrices that sum to target. A submatrix `x1, y1, x2, y2` is the set of all cells `matrix[x][y]` with `x1 <= x <= x2` and `y1 <= y <= y2`. Two submatrices `(x1, y1, x2, y2)` and `(x1', y1', x2', y2')` are different if they have some coordinate that is different: for example, if `x1 != x1'`. **Example 1:**  **Input:** matrix = \[\[0,1,0],[1,1,1],[0,1,0]], target = 0 **Output:** 4 **Explanation:** The four 1x1 submatrices that only contain 0. **Example 2:** **Input:** matrix = \[\[1,-1],[-1,1]], target = 0 **Output:** 5 **Explanation:** The two 1x2 submatrices, plus the two 2x1 submatrices, plus the 2x2 submatrix. **Example 3:** **Input:** matrix = \[\[904]], target = 0 **Output:** 0 **Constraints:** * `1 <= matrix.length <= 100` * `1 <= matrix[0].length <= 100` * `-1000 <= matrix[i] <= 1000` * `-10^8 <= target <= 10^8`

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	numSubmatrixSumTarget(int[][] matrix, int target)

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

numSubmatrixSumTarget

public int numSubmatrixSumTarget(int[][] matrix,
 int target)