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Leetcode 731: My Calendar II
You are implementing a calendar system where you can add events. Each event is represented by a start time and an end time, defined as a half-open interval [startTime, endTime). You need to ensure that no more than two events overlap at any given time, or else return false. Your task is to implement a class, MyCalendarTwo, that will book events while preventing triple bookings.
Leetcode 744: Find Smallest Letter Greater Than Target
You are given a sorted array letters containing lowercase English letters and a character target. Return the smallest character in letters that is lexicographically greater than target. If no such character exists, return the first character in letters.
Leetcode 754: Reach a Number
You are standing at position 0 on an infinite number line. There is a destination at position target. You can make some number of moves where, on the i-th move, you take exactly i steps either left or right. The goal is to determine the minimum number of moves required to reach the target.
Leetcode 786: K-th Smallest Prime Fraction
You are given a sorted array of prime numbers and the number 1. You need to find the k-th smallest fraction formed by considering all possible fractions arr[i] / arr[j] where i < j. Return the k-th smallest fraction as an array of two integers, where arr[i] is the numerator and arr[j] is the denominator.
Leetcode 792: Number of Matching Subsequences
You are given a string s and an array of strings words. Your task is to determine how many words from the array are subsequences of the string s. A subsequence of a string is derived by deleting some or no characters from the original string without altering the order of the remaining characters.
Leetcode 825: Friends Of Appropriate Ages
You are given an integer array ages, where each element represents the age of a person on a social media platform. A person will not send a friend request to another person if any of the following conditions are true:
- The recipient’s age is less than or equal to half of the sender’s age plus 7.
- The recipient’s age is greater than the sender’s age.
- The recipient’s age is greater than 100 and the sender’s age is less than 100.
Otherwise, the sender can send a friend request. Return the total number of friend requests made between people.