_1165.java

package com.fishercoder.solutions;

/**
 * 1165. Single-Row Keyboard
 *
 * There is a special keyboard with all keys in a single row.
 * Given a string keyboard of length 26 indicating the layout of the keyboard (indexed from 0 to 25),
 * initially your finger is at index 0.
 * To type a character, you have to move your finger to the index of the desired character. The time taken to move your finger from index i to index j is |i - j|.
 *
 * You want to type a string word. Write a function to calculate how much time it takes to type it with one finger.
 *
 * Example 1:
 * Input: keyboard = "abcdefghijklmnopqrstuvwxyz", word = "cba"
 * Output: 4
 * Explanation: The index moves from 0 to 2 to write 'c' then to 1 to write 'b' then to 0 again to write 'a'.
 * Total time = 2 + 1 + 1 = 4.
 *
 * Example 2:
 * Input: keyboard = "pqrstuvwxyzabcdefghijklmno", word = "leetcode"
 * Output: 73
 *
 * Constraints:
 * keyboard.length == 26
 * keyboard contains each English lowercase letter exactly once in some order.
 * 1 <= word.length <= 10^4
 * word[i] is an English lowercase letter.
 * */
public class _1165 {
    public static class Solution1 {
        public int calculateTime(String keyboard, String word) {
            int time = 0;
            int fromIndex = 0;
            for (char c : word.toCharArray()) {
                int fingerMoves = Math.abs(fromIndex - keyboard.indexOf(c));
                fromIndex = keyboard.indexOf(c);
                time += fingerMoves;
            }
            return time;
        }
    }
}