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POJ 3680 Intervals(经典费用流)
解题思路: 区间K覆盖问题:数轴上有一些带权值的区间,选出权和尽量大的一些区间,使得任意一个点最多被K个区间覆盖。 构图方法为:把每一个数作为一个节点,然后对于权值为W的区间[ u, v ]连一条边,容量为1,费用为-w,再对所有相邻 的点连边i -> i + 1,容量为K,费用为0;最后求最左端到最右端的最小费用最大流即可。如果数值范围太大,需要先进行离散化。 #include #in...
分类:其他好文   时间:2015-02-12 16:21:16    阅读次数:231
leetcode_56_Merge Intervals
欢迎大家阅读参考,如有错误或疑问请留言纠正,谢谢 Merge Intervals Given a collection of intervals, merge all overlapping intervals. For example, Given [1,3],[2,6],[8,10],[15,18], return [1,6],[8,10],[15,18]. ...
分类:其他好文   时间:2015-02-11 18:42:12    阅读次数:129
leetcode[56]Merge Intervals
Given a collection of intervals, merge all overlapping intervals.For example,Given[1,3],[2,6],[8,10],[15,18],return[1,6],[8,10],[15,18]./** * Definiti...
分类:其他好文   时间:2015-02-09 15:44:44    阅读次数:153
leetcode[57]Insert Interval
Given a set ofnon-overlappingintervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initially...
分类:其他好文   时间:2015-02-09 15:29:45    阅读次数:161
hdu 3473 Minimum Sum 再来一波划分树,对划分树累觉不爱。
Problem Description You are given N positive integers, denoted as x0, x1 ... xN-1. Then give you some intervals [l, r]. For each interval, you need to find a number x to make as small as possible! Input The first line is an integer T (T <= 10), indicat...
分类:其他好文   时间:2015-02-07 14:39:36    阅读次数:205
[LeetCode]Insert Interval
Given a non-overlapping interval list which is sorted by start point. Insert a new interval into it, make sure the list is still in order and non-overlapping (merge intervals if necessary). Exam...
分类:其他好文   时间:2015-02-04 18:45:28    阅读次数:152
LeetCode[Sort]: Merge Intervals
Given a collection of intervals, merge all overlapping intervals.  For example,  Given [1,3],[2,6],[8,10],[15,18],  return [1,6],[8,10],[15,18]. 这个题目其实不难,只要理清楚各种情况利用插入排序的方法就可以完成,我的C++代码实现如下: ...
分类:其他好文   时间:2015-02-04 16:38:50    阅读次数:161
[Leetcode] Insert Interval
Given a set ofnon-overlappingintervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initially...
分类:其他好文   时间:2015-02-01 07:05:19    阅读次数:191
LeetCode Insert Interval
Given a set ofnon-overlappingintervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initially...
分类:其他好文   时间:2015-01-31 00:03:18    阅读次数:165
POJ 1201 Intervals
/**POJ 1201 Intervals*差分约束系统*见《图论算法理论、实现及应用》 P205*设s[i] 是集合Z中小于等于i的元素的个数,即s[i] = |{s|s∈Z, s= ci, 得到约束条件(1):* s[a(i-1)] - s[bi] = 0 即 s[i-1] - s[i] #i....
分类:其他好文   时间:2015-01-30 21:01:37    阅读次数:197
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