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Link for the Problem – Set Matrix Zeroes– LeetCode Problem
Set Matrix Zeroes – LeetCode Problem
Problem:
Given an m x n
integer matrix matrix
, if an element is 0
, set its entire row and column to 0
‘s, and return the matrix.
You must do it in place.
Example 1:
![Set Matrix Zeroes LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct] 2 mat1](https://assets.leetcode.com/uploads/2020/08/17/mat1.jpg)
Input: matrix = [[1,1,1],[1,0,1],[1,1,1]] Output: [[1,0,1],[0,0,0],[1,0,1]]
Example 2:
![Set Matrix Zeroes LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct] 3 mat2](https://assets.leetcode.com/uploads/2020/08/17/mat2.jpg)
Input: matrix = [[0,1,2,0],[3,4,5,2],[1,3,1,5]] Output: [[0,0,0,0],[0,4,5,0],[0,3,1,0]]
Constraints:
m == matrix.length
n == matrix[0].length
1 <= m, n <= 200
-231 <= matrix[i][j] <= 231 - 1
Set Matrix Zeroes– LeetCode Solutions
Set Matrix Zeroes in C++:
class Solution { public: void setZeroes(vector<vector<int>>& matrix) { const int m = matrix.size(); const int n = matrix[0].size(); bool shouldFillFirstRow = false; bool shouldFillFirstCol = false; for (int j = 0; j < n; ++j) if (matrix[0][j] == 0) { shouldFillFirstRow = true; break; } for (int i = 0; i < m; ++i) if (matrix[i][0] == 0) { shouldFillFirstCol = true; break; } // store the information in the 1st row/col for (int i = 1; i < m; ++i) for (int j = 1; j < n; ++j) if (matrix[i][j] == 0) { matrix[i][0] = 0; matrix[0][j] = 0; } // fill 0s for the matrix except the 1st row/col for (int i = 1; i < m; ++i) for (int j = 1; j < n; ++j) if (matrix[i][0] == 0 || matrix[0][j] == 0) matrix[i][j] = 0; // fill 0s for the 1st row if needed if (shouldFillFirstRow) for (int j = 0; j < n; ++j) matrix[0][j] = 0; // fill 0s for the 1st col if needed if (shouldFillFirstCol) for (int i = 0; i < m; ++i) matrix[i][0] = 0; } };
Set Matrix Zeroes in Java:
class Solution { public void setZeroes(int[][] matrix) { final int m = matrix.length; final int n = matrix[0].length; boolean shouldFillFirstRow = false; boolean shouldFillFirstCol = false; for (int j = 0; j < n; ++j) if (matrix[0][j] == 0) { shouldFillFirstRow = true; break; } for (int i = 0; i < m; ++i) if (matrix[i][0] == 0) { shouldFillFirstCol = true; break; } // store the information in the 1st row/col for (int i = 1; i < m; ++i) for (int j = 1; j < n; ++j) if (matrix[i][j] == 0) { matrix[i][0] = 0; matrix[0][j] = 0; } // fill 0s for the matrix except the 1st row/col for (int i = 1; i < m; ++i) for (int j = 1; j < n; ++j) if (matrix[i][0] == 0 || matrix[0][j] == 0) matrix[i][j] = 0; // fill 0s for the 1st row if needed if (shouldFillFirstRow) for (int j = 0; j < n; ++j) matrix[0][j] = 0; // fill 0s for the 1st col if needed if (shouldFillFirstCol) for (int i = 0; i < m; ++i) matrix[i][0] = 0; } }
Set Matrix Zeroes in Python:
class Solution: def setZeroes(self, matrix: List[List[int]]) -> None: m = len(matrix) n = len(matrix[0]) shouldFillFirstRow = 0 in matrix[0] shouldFillFirstCol = 0 in list(zip(*matrix))[0] # store the information in the 1st row/col for i in range(1, m): for j in range(1, n): if matrix[i][j] == 0: matrix[i][0] = 0 matrix[0][j] = 0 # fill 0s for the matrix except the 1st row/col for i in range(1, m): for j in range(1, n): if matrix[i][0] == 0 or matrix[0][j] == 0: matrix[i][j] = 0 # fill 0s for the 1st row if needed if shouldFillFirstRow: matrix[0] = [0] * n # fill 0s for the 1st col if needed if shouldFillFirstCol: for row in matrix: row[0] = 0
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