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PR Summary
<풀이 시간>
1 시간
<문제 회고>
예전에 LeetCode로 LCA 문제를 풀었었고, 이번 문제도 예전에 푼 적이 있어 상대적으로 빨리 해결했다.
처음엔 N이 10만이라서 search하는데 O(N)으로 구현했다가 M도 10만이라서 O(MlogN)으로 풀었다.
log N으로 해결하는 방법이 생각이 안 나 오래 걸렸다.