Package g3201_3300.s3271_hash_divided_string

Class Solution

java.lang.Object

g3201_3300.s3271_hash_divided_string.Solution

public class Solution
extends Object

3271 - Hash Divided String.

Medium

You are given a string s of length n and an integer k, where n is a multiple of k. Your task is to hash the string s into a new string called result, which has a length of n / k.

First, divide s into n / k substrings , each with a length of k. Then, initialize result as an empty string.

For each substring in order from the beginning:

• The hash value of a character is the index of that character in the English alphabet (e.g., 'a' \u2192 0, 'b' \u2192 1, …, 'z' \u2192 25).
• Calculate the sum of all the hash values of the characters in the substring.
• Find the remainder of this sum when divided by 26, which is called hashedChar.
• Identify the character in the English lowercase alphabet that corresponds to hashedChar.
• Append that character to the end of result.

Return result.

Example 1:

Input: s = “abcd”, k = 2

Output: “bf”

Explanation:

First substring: "ab", 0 + 1 = 1, 1 % 26 = 1, result[0] = 'b'.

Second substring: "cd", 2 + 3 = 5, 5 % 26 = 5, result[1] = 'f'.

Example 2:

Input: s = “mxz”, k = 3

Output: “i”

Explanation:

The only substring: "mxz", 12 + 23 + 25 = 60, 60 % 26 = 8, result[0] = 'i'.

Constraints:

• 1 <= k <= 100
• k <= s.length <= 1000
• s.length is divisible by k.
• s consists only of lowercase English letters.

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
String	stringHash(String s, int k)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

stringHash

public String stringHash(String s,
 int k)