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g2301_2400.s2381_shifting_letters_ii.readme.md Maven / Gradle / Ivy

2381\. Shifting Letters II

Medium

You are given a string `s` of lowercase English letters and a 2D integer array `shifts` where shifts[i] = [starti, endi, directioni]. For every `i`, **shift** the characters in `s` from the index starti to the index endi (**inclusive**) forward if directioni = 1, or shift the characters backward if directioni = 0.

Shifting a character **forward** means replacing it with the **next** letter in the alphabet (wrapping around so that `'z'` becomes `'a'`). Similarly, shifting a character **backward** means replacing it with the **previous** letter in the alphabet (wrapping around so that `'a'` becomes `'z'`).

Return _the final string after all such shifts to_ `s` _are applied_.

**Example 1:**

**Input:** s = "abc", shifts = [[0,1,0],[1,2,1],[0,2,1]]

**Output:** "ace"

**Explanation:** Firstly, shift the characters from index 0 to index 1 backward. Now s = "zac".

Secondly, shift the characters from index 1 to index 2 forward. Now s = "zbd".

Finally, shift the characters from index 0 to index 2 forward. Now s = "ace".

**Example 2:**

**Input:** s = "dztz", shifts = [[0,0,0],[1,1,1]]

**Output:** "catz"

**Explanation:** Firstly, shift the characters from index 0 to index 0 backward. Now s = "cztz".

Finally, shift the characters from index 1 to index 1 forward. Now s = "catz".

**Constraints:**

*   1 <= s.length, shifts.length <= 5 * 104
*   `shifts[i].length == 3`
*   0 <= starti <= endi < s.length
*   0 <= directioni <= 1
*   `s` consists of lowercase English letters.