Description
There is a special typewriter with lowercase English letters ‘a’ to ‘z’ arranged in a circle with a pointer. A character can only be typed if the pointer is pointing to that character. The pointer is initially pointing to the character ‘a’.
Each second, you may perform one of the following operations:
- Move the pointer one character counterclockwise or clockwise.
- Type the character the pointer is currently on.
Given a string word, return the minimum number of seconds to type out the characters in word.
Examples
Input: word = "abc"
Output: 5
Explanation:
The characters are printed as follows:
- Type the character 'a' in 1 second since the pointer is initially on 'a'.
- Move the pointer clockwise to 'b' in 1 second.
- Type the character 'b' in 1 second.
- Move the pointer clockwise to 'c' in 1 second.
- Type the character 'c' in 1 second.
Input: word = "zjpc"
Output: 34
Explanation:
The characters are printed as follows:
- Move the pointer counterclockwise to 'z' in 1 second.
- Type the character 'z' in 1 second.
- Move the pointer clockwise to 'j' in 10 seconds.
- Type the character 'j' in 1 second.
- Move the pointer clockwise to 'p' in 6 seconds.
- Type the character 'p' in 1 second.
- Move the pointer counterclockwise to 'c' in 13 seconds.
- Type the character 'c' in 1 second.Solution
计算两个字符之间的移动距离，取最小。
/**
* @param {string} word
* @return {number}
*/
var minTimeToType = function(word) {
let move_num = 0, // 当前字符与目标字符的距离
seconds = 0; // 总使用时间
let current_ch = 'a';
for(let ch of word) {
seconds++;
let tar = ch.charCodeAt(), cur = current_ch.charCodeAt();
move_num = Math.abs(tar - cur);
if(move_num > 13) {
move_num = 26 - move_num;
}
seconds += move_num;
current_ch = ch;
move_num = 0;
}
return seconds;
};Result
Accepted
134/134 cases passed (88 ms)
Your runtime beats 29.85 % of javascript submissions
Your memory usage beats 14.93 % of javascript submissions (40.9 MB)
