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Feat: adds Pablo Limon-Paredes Java and TS lesson 13 Permutation Difference with a hashmap #444

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Original file line number Diff line number Diff line change
@@ -1,12 +1,23 @@
package com.codedifferently.lesson13;

import java.util.HashMap;

public class Lesson13 {

/**
* Provide the solution to LeetCode 3146 here:
* https://leetcode.com/problems/permutation-difference-between-two-strings
*/
public int findPermutationDifference(String s, String t) {
return 0;
var sIndexByChar = new HashMap<Character, Integer>();
int permDiff = 0;
for (int i = 0; i < s.length(); i++) {
sIndexByChar.put(s.charAt(i), i);
}
for (char key : sIndexByChar.keySet()) {
int indexInT = t.indexOf(Character.toString(key));
permDiff += Math.abs(s.indexOf(key) - indexInT);
}
return permDiff;
}
}
11 changes: 10 additions & 1 deletion lesson_13/maps_ts/src/lesson13.ts
Original file line number Diff line number Diff line change
Expand Up @@ -3,5 +3,14 @@
* https://leetcode.com/problems/permutation-difference-between-two-strings
*/
export function findPermutationDifference(s: string, t: string): number {
return 0;
const sIndexByChar = new Map<string, number>();
let permDiff = 0;
for (let i = 0; i < s.length; i++) {
sIndexByChar.set(s.charAt(i), i);
}
for (const key of sIndexByChar.keys()) {
const indexInT = t.indexOf(key);
permDiff += Math.abs(s.indexOf(key) - indexInT);
}
return permDiff;
}