D - Fill The Bag（贪心/位运算）

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题目：http://codeforces.com/contest/1303/problem/D 题意：给定数n和m个数 a i a_i ai（都是2的幂次），这m个数可以进行裂分成更小的2的幂次数，问最少需要裂分多少次，才能找到若干数，刚好凑成数n。其中 1 < = n < = 1 e 18 , 1 < = m < = 1 e 5 , 1 < = a i < = 1 e 9 1

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D - Fill The Bag（贪心/位运算）

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