Search a 2D Matrix II

// 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 vote186 views1 answer
How to add a command to a button java
Java
1 vote189 views1 answer
How to check if location is enabled android
Java
0 vote175 views1 answer
Java hashmap remove by condition
Java
1 vote176 views1 answer
Java calculate delta time from thread
Java
0 vote198 views1 answer
Java forcing user to input int
Java
0 vote205 views1 answer
Java kommazahl abschneiden
Java
0 vote187 views1 answer
Jsoup remove element
Java
0 vote199 views1 answer
In java write a code that suppose the following input is supplied to the program: 9 Then, the output should be: 12096 (99+999+9999+999)
Java
0 vote185 views1 answer
Textfield border radiuis in javafx
Java
0 vote175 views1 answer
Determining what type of data the ArrayList will contain in java.
Java