【CF553E】Kyoya and Train 题意:有一张$n$个点到$m$条边的有向图,经过第i条边要花$c_i$元钱,经过第i条边有$p_{i,k}$的概率要耗时k分钟。你想从1走到n,但是如果整个过程耗时超过了$t$,则需要额外花费$f$元。求从1走到n的期望最小花费。 $n\le 50,m ...
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其他好文 时间:
2018-04-01 10:38:14
阅读次数:
140
75. Sort Colors 题目 Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors ...
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其他好文 时间:
2018-03-31 16:39:31
阅读次数:
137
题目传送门 题目大意:给你若干根木棍,每根木棍有前后两种颜色,连接两根木棍需要前后颜色相同,求能否将所有木棍连接在一起。 Solution: 不要将木棍看成点,将颜色看成点。 其实就是求是否存在欧拉路径。 有欧拉路径要满足两个条件: 图是连通图。 没有或只有两个入度为奇数的点。 判断连通性用并查集。 ...
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其他好文 时间:
2018-03-14 12:46:45
阅读次数:
169
Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a st ...
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其他好文 时间:
2018-03-03 14:06:56
阅读次数:
167
Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, ...
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编程语言 时间:
2018-03-03 11:02:41
阅读次数:
258
Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, ...
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其他好文 时间:
2018-02-20 23:34:41
阅读次数:
210
Colored Sticks Time Limit: 5000MS Memory Limit: 128000K Total Submissions: 38355 Accepted: 10044 Description You are given a bunch of wooden sticks. E ...
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其他好文 时间:
2018-02-13 12:32:20
阅读次数:
187
题链: http://codeforces.com/problemset/problem/623/E 题解: FFT,DP 题意: 一个有向图,给出每条边的起点u,终点v,费用c,以及花费每种时间的概率P[e][j](表示走第e条边花费时间为j的概率) 现在需要从1号点走到n号点,如果不能在T个单位 ...
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其他好文 时间:
2018-01-24 15:35:33
阅读次数:
149
Painting some colored segments on a line, some previously painted segments may be covered by some the subsequent ones. Your task is counting the segme ...
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其他好文 时间:
2018-01-19 18:52:57
阅读次数:
186
题目: Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order r ...
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编程语言 时间:
2017-12-21 11:50:59
阅读次数:
202