Video Buffer Continuity

A video player downloads chunks of a video. Each chunk covers a time range [start, end]. The player starts at time 0. It can play continuously as long as the current time is covered by at least one downloaded chunk. Find the furthest timestamp T the player can reach starting from 0 without hitting a gap. Input Format: - Line 1: N (number of chunks). - Line 2: V (total video duration). - Next N lines: start and end of each chunk. Output Format: - The furthest reached timestamp (integer, capped at V). Example: Input: 3 100 0 20 15 40 50 80 Output: 40 (Explanation: Chunks [0,20] and [15,40] merge to [0,40]. Since no chunk covers time 40, the player stops.)