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Leetcode Set Matrix Zeroes problem solution

YASH PAL, 31 July 202418 January 2026

In this Leetcode Set Matrix Zeroes problem solution we have given an m x n integer matrix, if an element is 0, set its entire row and column to 0’s, and return the matrix.

Leetcode Set Matrix Zeroes problem solution

Leetcode Set Matrix Zeroes problem solution in Python.

N=len(matrix)
        n=len(matrix[0])
        iarr=set()
        jarr=set()
 
        for i in range(N):
            for j in range(n):
                if matrix[i][j]==0:
                    if i not in iarr:
                        iarr.add(i)
                    if j not in jarr:
                        jarr.add(j)
                    
        for val in iarr:
            for j in range(n):
                matrix[val][j]=0
        for val in jarr:
            for i in range(N):
                matrix[i][val]=0

Set Matrix Zeroes problem solution in Java.

class Solution {
    public void setZeroes(int[][] matrix) {
        int fRow = 1, fCol = 1;
            
        for(int i = 0; i < matrix.length; i++) {
            for(int j = 0; j < matrix[0].length; j++) {
                if(matrix[i][j] == 0) {
                    if (i == 0) {
                        fRow = 0;
                    }
                    if (j == 0) {
                        fCol = 0;
                    }
                    matrix[0][j] = 0;
                    matrix[i][0] = 0;
                }
            }
        }

        for(int i = 1; i < matrix.length; i++) {
            for(int j = 1; j < matrix[0].length; j++) {
                if(matrix[i][0] == 0 || matrix[0][j] == 0) {
                    matrix[i][j] = 0;
                }
            }
        }
        if (fRow == 0) {
            for (int j = 0; j < matrix[0].length; j++) {
                matrix[0][j] = 0;
            }
        }
        if (fCol == 0) {
            for (int i = 0; i < matrix.length; i++) {
                matrix[i][0] = 0;
            }
        }
    }
}

Problem solution in C++.

void setZeroes(vector<vector<int>>& matrix) {
        vector<pair<int,int>>a;
        int m = matrix.size();
        int n = matrix[0].size();
        for(int i=0;i<m;i++)
        {
            for(int j=0;j<n;j++)
            {
                if(matrix[i][j]==0)
                    a.push_back(make_pair(i,j));
            }
        }
        
        for(auto e: a)
        {
            for(int j=0;j<n;j++)
            {
               if(matrix[e.first][j] != 0)
                   matrix[e.first][j]=0;
            }
            for(int i=0;i<m;i++)
            {
                if(matrix[i][e.second] != 0)
                    matrix[i][e.second]=0;
            }
        }
    }

Problem solution in C.

void setZeroes(int** matrix, int matrixSize, int* matrixColSize){

    int auxmat[matrixSize][(*matrixColSize)]; //auxmat is an auxillary matrix
    int i,j,k;
    for(i=0;i<matrixSize;i++)
    {
        for(j=0;j<*(matrixColSize);j++)
        {
            auxmat[i][j]=matrix[i][j];
        }
    }
    for(i=0;i<matrixSize;i++)
    {
        for(j=0;j<(*matrixColSize);j++)
        {
            if(matrix[i][j]==0)
            {
                for(k=0;k<matrixSize;k++)
                {
                    auxmat[k][j]=0;
                }
                
                for(k=0;k<(*matrixColSize);k++)
                {
                    auxmat[i][k]=0;
                }
            }
        }
    }
    for(i=0;i<matrixSize;i++)
    {
        for(j=0;j<(*matrixColSize);j++)
        {
            matrix[i][j]=auxmat[i][j];
        }
    }
}

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