875. Koko Eating Bananas

Koko loves to eat bananas. There are n piles of bananas, the ith pile has piles[i] bananas. The guards have gone and will come back in h hours.

Koko can decide her bananas-per-hour eating speed of k. Each hour, she chooses some pile of bananas and eats k bananas from that pile. If the pile has less than k bananas, she eats all of them instead and will not eat any more bananas during this hour.

Koko likes to eat slowly but still wants to finish eating all the bananas before the guards return.

Return the minimum integer k such that she can eat all the bananas within h hours.
解题重点：二分查找

#写作词汇加油站#
apprehension [ˌæprɪˈhenʃn] n. 恐惧，担忧
The accident caused no little apprehension. 这一事故引起了不小的忧虑。
The students entered the examination room, filled with apprehension. 学生们惴惴不安地进了考场。
On hearing that, he gave an apprehensive look. 听到此话，他显出恐惧的神色。
The kid was apprehensive of dаᥒgеr. 这个小孩害怕有危险。
It reflects real аᥒgеr and apprehension аbᥙt the future. 这反映出对未来真正的愤怒和忧虑。
Miss Highⅿith is the poet of apprehension. 海史密斯小姐以恐惧为诗。
——《卡罗尔》书末附评，Graham Greene评本书作者

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