g1201_1300.s1253_reconstruct_a_2_row_binary_matrix

Class Solution

java.lang.Object

g1201_1300.s1253_reconstruct_a_2_row_binary_matrix.Solution

public class Solution
extends Object

1253 - Reconstruct a 2-Row Binary Matrix.

Medium

Given the following details of a matrix with n columns and 2 rows :

• The matrix is a binary matrix, which means each element in the matrix can be 0 or 1.
• The sum of elements of the 0-th(upper) row is given as upper.
• The sum of elements of the 1-st(lower) row is given as lower.
• The sum of elements in the i-th column(0-indexed) is colsum[i], where colsum is given as an integer array with length n.

Your task is to reconstruct the matrix with upper, lower and colsum.

Return it as a 2-D integer array.

If there are more than one valid solution, any of them will be accepted.

If no valid solution exists, return an empty 2-D array.

Example 1:

Input: upper = 2, lower = 1, colsum = [1,1,1]

Output: 1,1,0],[0,0,1

Explanation: 1,0,1],[0,1,0, and 0,1,1],[1,0,0 are also correct answers.

Example 2:

Input: upper = 2, lower = 3, colsum = [2,2,1,1]

Output: []

Example 3:

Input: upper = 5, lower = 5, colsum = [2,1,2,0,1,0,1,2,0,1]

Output: 1,1,1,0,1,0,0,1,0,0],[1,0,1,0,0,0,1,1,0,1

Constraints:

• 1 <= colsum.length <= 10^5
• 0 <= upper, lower <= colsum.length
• 0 <= colsum[i] <= 2

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
List<List<Integer>>	reconstructMatrix(int upper, int lower, int[] colsum)

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

reconstructMatrix

public List<List<Integer>> reconstructMatrix(int upper,
                                             int lower,
                                             int[] colsum)