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 1. You are given a string str. 2. You are required to calculate and print the count of subsequences of the nature a+b+c+. For abbc -> there are 3 subsequences. abc, abc, abbc For abcabc -> there are 7 subsequences. abc, abc, abbc, aabc, abcc, abc, abc. Input Format A string str Output Format count of subsequences of the nature a+b+c+ Constraints 0 < str.length <= 10 Sample Input abcabc Sample Output 7 Solution: import java.io.*; import java.util.*; public class Main {     public static void main(String[] args) throws Exception {         Scanner sc = new Scanner(System.in);         String str = sc.nextLine();         int counta = 0, countb = 0, countc = 0;         for(int i=0;i<str.length();i++){             char ch = str.charAt(i);             if(ch == 'a')                 ++coun...

1. You are given a number n, which represents the length of a road. The road has n plots on it's each side. 2. The road is to be so planned that there should not be consecutive buildings on either side of the road. 3. You are required to find and print the number of ways in which the buildings can be built on both side of roads. Input Format A number n Output Format A number representing the number of ways in which the buildings can be built on both side of roads. Constraints 0 < n <= 45 Sample Input 6 Sample Output 441 Solution: import java.io.*; import java.util.*; public class Main{ public static void main(String[] args) throws Exception {     // write your code here     Scanner scn = new Scanner(System.in);     long n = scn.nextInt();     long ob = 1;     long os = 1;     for (int i = 2; i <= n; i++) {       long nb = os;       long ns = os + ob;       ob = nb;   ...

1. You are given a number n, representing the count of items. 2. You are given n numbers, representing the values of n items. 3. You are given n numbers, representing the weights of n items. 3. You are given a number "cap", which is the capacity of a bag you've. 4. You are required to calculate and print the maximum value that can be created in the bag without overflowing it's capacity. Note1: Items can be added to the bag even partially. But you are not allowed to put same items again and again to the bag. Input Format A number n v1 v2 .. n number of elements w1 w2 .. n number of elements A number cap Output Format A decimal number representing the maximum value that can be created in the bag without overflowing it's capacity 1. You are given a number n, representing the count of items. 2. You are given n numbers, representing the values of n items. 3. You are given n numbers, representing the weights of n items. 3. You are given a number "cap", which i...

1. You are given a number n, representing the count of items. 2. You are given n numbers, representing the values of n items. 3. You are given n numbers, representing the weights of n items. 3. You are given a number "cap", which is the capacity of a bag you've. 4. You are required to calculate and print the maximum value that can be created in the bag without      overflowing it's capacity. Note: Each item can be taken any number of times. You are allowed to put the same item again                    and again. Input Format A number n v1 v2 .. n number of elements w1 w2 .. n number of elements A number cap Output Format A number representing the maximum value that can be created in the bag without overflowing it's capacity Constraints 1 <= n <= 20 0 <= v1, v2, .. n elements <= 50 0 < w1, w2, .. n elements <= 10 0 < cap <= 10 Sample Input 5 15 14 10 45 30 2 5 1 3 4 7 Sample Output 100 Solution: im...

 1. You are given a number n, representing the count of coins. 2. You are given n numbers, representing the denominations of n coins. 3. You are given a number "amt". 4. You are required to calculate and print the number of permutations of the n coins using which the       amount "amt" can be paid. Note 1: You have an infinite supply of each coin denomination i.e. same coin denomination can be                    used for many installments in payment of "amt" Note 2: You are required to find the count of permutations and not combinations i.e.                   2 + 2 + 3 = 7 and 2 + 3 + 2 = 7 and 3 + 2 + 2 = 7 are different permutations of same                    combination. You should treat them as 3 and not 1. Input Format A number n n1 n2 .. n number of elements A number amt Output Format A number representing the cou...

1. You are given a number n, representing the count of coins. 2. You are given n numbers, representing the denominations of n coins. 3. You are given a number "amt". 4. You are required to calculate and print the number of combinations of the n coins using which the       amount "amt" can be paid. Note 1: You have an infinite supply of each coin denomination i.e. same coin denomination can be                    used for many installments in payment of "amt" Note 2: You are required to find the count of combinations and not permutations i.e.                   2 + 2 + 3 = 7 and 2 + 3 + 2 = 7 and 3 + 2 + 2 = 7 are different permutations of same                    combination. You should treat them as 1 and not 3. Input Format A number n n1 n2 .. n number of elements A number amt Output Format A number representing the count of ...

1. You are given a number n, representing the number of stairs in a staircase. 2. You are on the 0th step and are required to climb to the top. 3. You are given n numbers, where ith element's value represents - till how far from the step you       could jump to in a single move.  You can of-course fewer number of steps in the move. 4. You are required to print the number of minimum moves in which you can reach the top of       staircase. Note -> If there is no path through the staircase print null. Input Format A number n .. n more elements Output Format A number representing the number of ways to climb the stairs from 0 to top. Constraints 0 <= n <= 20 0 <= n1, n2, .. <= 20 Sample Input 10 3 3 0 2 1 2 4 2 0 0 Sample Output 4 Solution: import java.io.*; import java.util.*; public class Main {     public static void main(String[] args) throws Exception {         // write your code here    ...

 1. You are given a number n, representing the number of stairs in a staircase. 2. You are on the 0th step and are required to climb to the top. 3. You are given n numbers, where ith element's value represents - till how far from the step you       could jump to in a single move.        You can of course jump fewer number of steps in the move. 4. You are required to print the number of different paths via which you can climb to the top. Input Format A number n .. n more elements Output Format A number representing the number of ways to climb the stairs from 0 to top. Constraints 0 <= n <= 20 0 <= n1, n2, .. <= 20 Sample Input 10 3 3 0 2 1 2 4 2 0 0 Sample Output 5 Solution: import java.io.*; import java.util.*; public class Main {     public static void main(String[] args) throws Exception {         // write your code here         Scanner sc = new Scanner(System.in);   ...

 1. You are given an array(arr) of integers. 2. You have to sort the given array in increasing order using selection sort. Input Format An Integer n  arr1 arr2.. n integers Output Format Check the sample ouput and question video. Constraints 1 <= N <= 10000 -10^9 <= arr[i] <= 10^9 Sample Input 5 7  -2  4  1  3 Sample Output Comparing -2 and 7 Comparing 4 and -2 Comparing 1 and -2 Comparing 3 and -2 Swapping 7 and -2 Comparing 4 and 7 Comparing 1 and 4 Comparing 3 and 1 Swapping 7 and 1 Comparing 7 and 4 Comparing 3 and 4 Swapping 4 and 3 Comparing 4 and 7 Swapping 7 and 4 -2 1 3 4 7 Solution: import java.io.*; import java.util.*; public class Main {   public static void selectionSort(int[] arr) {     //write your code here     for(int i=0;i<arr.length-1;i++){         int idx = i;         for(int j=i+1;j<arr.length;j++)             if(isSmaller(ar...