Search in 2D matrix

// Search a 2D Matrix II
// https://leetcode.com/problems/search-a-2d-matrix-ii
class Solution {
    public boolean searchMatrix(int[][] matrix, int target) {
        int row = 0;
        int col = matrix[0].length-1;
        
        while (row < matrix.length && col >= 0){
            if (matrix[row][col] == target) return true;
            if (matrix[row][col] < target) row++;
            else if (matrix[row][col] > target) col--;
        }
       return false;
    }
}

Search a 2D Matrix

class Solution {
    public boolean searchMatrix(int[][] matrix, int target) {
        if(matrix.length == 0) return false;
        int rows = matrix.length;
        int cols = matrix[0].length;
        
        int left = 0;
        int right = rows*cols-1;
        
        while(left <= right){
            int mid = left + (right-left)/2; // calculates the mid point of 1D array.
            int midElement = matrix[mid/cols][mid%cols]; // converting midpoint of 1D array to 2D array
            if(midElement == target) return true;
            if(midElement < target) left = mid+1;
            else right = mid-1;
        }
        return false;
    }
}

Similar codes

0 vote385 views1 answer
Java spring boot json deserialize date inaccurate
Java Spring
4 votes357 views2 answers
Update alternatives java
Java
0 vote322 views1 answer
Crud repository count number of items in a list
Java
8 votes366 views10 answers
Hi
Java
1 vote312 views1 answer
Java convert a set to array
Java
1 vote404 views1 answer
Android recyclerview show hide item with animation with default animation
Java
2 votes349 views2 answers
How to convert date to dd-mon-yyyy format in java
Java
0 vote358 views1 answer
Pythagoras method in java
Java
0 vote333 views1 answer
Android paint drawtext multiline
Java
0 vote338 views1 answer
Lombok boolean is prefix
Java