Weighted Uniform Strings in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

• It is easy to understand.
• Algorithm is a step-wise representation of a solution to a given problem.
• In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the Problem – Weighted Uniform Strings– Hacker Rank Solution

Weighted Uniform Strings – Hacker Rank Solution

Problem:

A weighted string is a string of lowercase English letters where each letter has a weight. Character weights are  to  from  to  as shown below:

• The weight of a string is the sum of the weights of its characters. For example:
• A uniform string consists of a single character repeated zero or more times. For example, ccc and a are uniform strings, but bcb and cd are not.

Given a string, , let  be the set of weights for all possible uniform contiguous substrings of string . There will be  queries to answer where each query consists of a single integer. Create a return array where for each query, the value is Yes if . Otherwise, append No.

Note: The  symbol denotes that  is an element of set .

Example

.

Working from left to right, weights that exist are:

string  weight
a       1
b       2
bb      4
c       3
cc      6
ccc     9
d       4
dd      8
ddd     12
dddd    16

Now for each value in , see if it exists in the possible string weights. The return array is ['Yes', 'No', 'No', 'Yes', 'No'].

Function Description

Complete the weightedUniformStrings function in the editor below.

weightedUniformStrings has the following parameter(s):
– string s: a string
– int queries[n]: an array of integers

Returns
– string[n]: an array of strings that answer the queries

Input Format

The first line contains a string , the original string.
The second line contains an integer , the number of queries.
Each of the next  lines contains an integer , the weight of a uniform subtring of  that may or may not exist.

Constraints

•  will only contain lowercase English letters, ascii[a-z].

Sample Input 0

abccddde
6
1
3
12
5
9
10

Sample Output 0

Yes
Yes
Yes
Yes
No
No

Explanation 0

The weights of every possible uniform substring in the string abccddde are shown below:

We print Yes on the first four lines because the first four queries match weights of uniform substrings of . We print No for the last two queries because there are no uniform substrings in  that have those weights.

Note that while de is a substring of  that would have a weight of , it is not a uniform substring.

Note that we are only dealing with contiguous substrings. So ccc is not a substring of the string ccxxc.

Sample Input 1

aaabbbbcccddd
5
9
7
8
12
5

Sample Output 1

Yes
No
Yes
Yes
No

Weighted Uniform Strings – Hacker Rank Solution

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        int len =  s.length();
        int n = in.nextInt();
        Set<Integer> set = new HashSet<Integer>();
        int i=0;
        while(i<len){
             int j=i;
             int sum =0;
             while( j<len && s.charAt(i)==s.charAt(j) ){
                 sum += (s.charAt(i)-'a') +1;
                 set.add(sum);
                 j++;
             }
            i = j;
        }
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            if (set.contains(x)){
                System.out.println("Yes");
            }
            else{
                System.out.println("No");
            }
        }
    }
}