Formatted question description: https://leetcode.ca/all/1629.html
1629. Slowest Key
Level
Easy
Description
A newly designed keypad was tested, where a tester pressed a sequence of n
keys, one at a time.
You are given a string keysPressed
of length n
, where keysPressed[i]
was the ith
key pressed in the testing sequence, and a sorted list releaseTimes
, where releaseTimes[i]
was the time the ith
key was released. Both arrays are 0indexed. The 0th
key was pressed at the time 0
, and every subsequent key was pressed at the exact time the previous key was released.
The tester wants to know the key of the keypress that had the longest duration. The ith
keypress had a duration of releaseTimes[i]  releaseTimes[i  1]
, and the 0th
keypress had a duration of releaseTimes[0]
.
Note that the same key could have been pressed multiple times during the test, and these multiple presses of the same key may not have had the same duration.
Return the key of the keypress that had the longest duration. If there are multiple such keypresses, return the lexicographically largest key of the keypresses.
Example 1:
Input: releaseTimes = [9,29,49,50], keysPressed = “cbcd”
Output: “c”
Explanation: The keypresses were as follows:
Keypress for ‘c’ had a duration of 9 (pressed at time 0 and released at time 9).
Keypress for ‘b’ had a duration of 29  9 = 20 (pressed at time 9 right after the release of the previous character and released at time 29).
Keypress for ‘c’ had a duration of 49  29 = 20 (pressed at time 29 right after the release of the previous character and released at time 49).
Keypress for ‘d’ had a duration of 50  49 = 1 (pressed at time 49 right after the release of the previous character and released at time 50).
The longest of these was the keypress for ‘b’ and the second keypress for ‘c’, both with duration 20.
‘c’ is lexicographically larger than ‘b’, so the answer is ‘c’.
Example 2:
Input: releaseTimes = [12,23,36,46,62], keysPressed = “spuda”
Output: “a”
Explanation: The keypresses were as follows:
Keypress for ‘s’ had a duration of 12.
Keypress for ‘p’ had a duration of 23  12 = 11.
Keypress for ‘u’ had a duration of 36  23 = 13.
Keypress for ‘d’ had a duration of 46  36 = 10.
Keypress for ‘a’ had a duration of 62  46 = 16.
The longest of these was the keypress for ‘a’ with duration 16.
Constraints:
releaseTimes.length == n
keysPressed.length == n
2 <= n <= 1000
0 <= releaseTimes[i] <= 10^9
releaseTimes[i] < releaseTimes[i+1]
keysPressed
contains only lowercase English letters.
Solution
For each key, calculate the duration using the current release time and the previous release time. Initially, the previous release time is 0. Once a greater release time is met, update the maximum release time and the corresponding key. Finally, return the slowest key.

class Solution { public char slowestKey(int[] releaseTimes, String keysPressed) { char slowestKey = 'a'; int slowestTime = 0; int length = releaseTimes.length; int prev = 0; for (int i = 0; i < length; i++) { int curr = releaseTimes[i]; char key = keysPressed.charAt(i); int time = curr  prev; if (time > slowestTime) { slowestKey = key; slowestTime = time; } else if (time == slowestTime && key > slowestKey) slowestKey = key; prev = curr; } return slowestKey; } }

// OJ: https://leetcode.com/problems/slowestkey/ // Time: O(N) // Space: O(1) class Solution { public: char slowestKey(vector<int>& releaseTimes, string keysPressed) { int N = releaseTimes.size(), prev = 0, ans = 0, maxTime = 0; for (int i = 0; i < N; ++i) { int time = releaseTimes[i]  prev; prev = releaseTimes[i]; if (time > maxTime  (time == maxTime && keysPressed[i]  'a' > ans)) { ans = keysPressed[i]  'a'; maxTime = time; } } return 'a' + ans; } };

# 1629. Slowest Key # https://leetcode.com/problems/slowestkey/ class Solution: def slowestKey(self, rt: List[int], kp: str) > str: m = float('inf') res = "" prev = 0 for i,t in enumerate(rt): v = t  prev if v >= m: m = v res = kp[i] prev = t return res