文章分类 - 贪心
贪心： 首先去把所有问题都枚举出来
摘要：class Solution { int[] tr; int n; private int lowbit(int x) { return x & -x; } private void add(int x, int v) { for (int i = x; i <= n; i += lowbit(i)
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摘要：class Solution { public String removeKdigits(String num, int k) { k = Math.min(num.length(), k); StringBuilder sb = new StringBuilder(); for (char c:
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