Tech Jargon - Decoded

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23/02/24

// Program to check wheather a string is palindrome or not
class Palindrome{
    public static void main(String args[])
    {
        String str="mam";
        System.out.println(isPalindrome(str));
    }
    public static boolean isPalindrome(String str){
        int left=0;
        int right=str.length()-1;
        while(left<right){
            if(str.charAt(left)!=str.charAt(right)){
                return false;
            }
            left++;
            right--;
        }
        return true;
    }
}

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17/02/24 Leetcode 31. Next Permutation https://leetcode.com/problems/next-permutation/

uploaading

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17/02/24 Leetcode 881. Boats to Save People https://leetcode.com/problems/boats-to-save-people/

class Solution {
    public int numRescueBoats(int[] people, int limit) {
        int left=0;
        int right=people.length-1;
        int boatCount=0;
        Arrays.sort(people);
        while(left<=right)
        {
            if(people[left]+people[right]<=limit){
                left++;
            }
            right--;
            boatCount++;
        }
        return boatCount;
    }
}

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Given an array consisting of only 0s, 1s, . The task is to sort the given array. The solution should put all 0s first, then all 1s at last

uploading

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15/02/24 Leetcode 167. Two Sum II - Input Array Is Sorted https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/ Brute force approach

class Solution {
    public int[] twoSum(int[] numbers, int target) {
        int[] index=new int[2];
         for (int i = 0; i < numbers.length; i++) {
            for (int j = i + 1; j < numbers.length; j++) {
                if (numbers[i] + numbers[j] == target) {
                  index[0]=i+1;
                  index[1]=j+1;
                }
            }
        }
                return index;
    }
}

Efficient approach

uploading

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14/02/24 Leetcode 26. Remove Duplicates from Sorted Array https://leetcode.com/problems/remove-duplicates-from-sorted-array/

class Solution {
    public int removeDuplicates(int[] nums) {
        int uniqueIndex=0;
        for(int i=1;i<nums.length;i++)
        {
            if(nums[i-1]!=nums[i])
            {
                uniqueIndex++;
                nums[uniqueIndex]=nums[i];
            }
        }
        return uniqueIndex+1;
    }
}

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14/02/24 Leetcode 54. Spiral Matrix https://leetcode.com/problems/spiral-matrix/

uploading

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13/02/24 Leetcode 48. Rotate Image https://leetcode.com/problems/rotate-image/

uploading

if anyone solved send solution to this username👇

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//Program to rotate a 2D array clockwise

class RotateMatrix {
    public static void main(String args[]) {
        int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };
        
        rotate(matrix);
        
        
    }

    public static void rotate(int[][] matrix) {
        int n = matrix.length;
        int[][] rotatedMatrix = new int[n][n];
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                rotatedMatrix[j][n - 1 - i] = matrix[i][j];
            }
        }
        // Copy rotatedMatrix back to matrix
        // Print the rotated matrix
        for (int[] row : rotatedMatrix) {
            for (int element : row) {
                System.out.print(element + " ");
            }
            System.out.println();
        }
    }
}

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12/02/24 Leetcode 73-Set Matrix Zeroes https://leetcode.com/problems/set-matrix-zeroes/

Code will be uploaded within evening

If anyone have solved send the program to this username👇

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Leetcode 857 -Transpose of a matrix

class Solution {
    public int[][] transpose(int[][] matrix) {
        int rows=matrix.length;
        int cols=matrix[0].length;
        int[][] transpose=new int[cols][rows];
        for(int i=0;i<rows;i++){
            for(int j=0;j<cols;j++){
                transpose[j][i]=matrix[i][j];
            }
        }
        return transpose;
    }
}

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// Program for multiplication of two matrices
class MatrixMultiplication{
    public static void main(String args[]){
        int[][] arr1={
            {1,2,3},
            {4,5,6},
            {7,8,9}
        };
        int[][] arr2={
            {7,8,9},
            {4,5,6},
            {1,2,3}
        };
        int rows1=arr1.length;
        int cols1=arr1[0].length;
        int rows2=arr2.length;
        int cols2=arr2[0].length;
        if(cols1 != rows2){
            System.out.println("Matrix cannot be multiplied");
        }
        else{
            int[][] res=new int[rows1][cols2];
            for(int i=0;i<rows1;i++){
                for(int j=0;j<cols2;j++){
                    int sum=0;
                    for(int k=0;k<cols1;k++){
                        sum=sum+arr1[i][k]*arr2[k][j];
                    }
                    res[i][j]=sum;
                 }
            }
            System.out.println("Resultant matrix is:");
            for(int i=0;i<rows1;i++){
                for(int j=0;j<cols2;j++){
                    System.out.print(res[i][j]+" ");
                }
                System.out.println();
            }
        }
    }
}