[题目链接] http://poj.org/problem?id=2054 [算法] 贪心 [代码] #include <algorithm> #include <bitset> #include <cctype> #include <cerrno> #include <clocale> #include <cmath> #include <complex> #include <cstdio> #include…

Color Description Beads of N colors are connected together into a circular necklace of N beads (N<=1000000000). Your job is to calculate how many different kinds of the necklace can be produced. You should know that the necklace might not use up all…

http://poj.org/problem?id=2154 还是先套上Burnside引理:\[\begin{aligned} ans & =\sum_{i=1}^n n^{(i,n)-1} \\ & = \sum_{d=1}^n [d|n]\sum_{i=1}^n [d|i]\left[\left(\frac id,\frac nd\right)=1\right]n^{d-1} \\ & = \sum_{d=1}^n [d|n]n^{d-1}\sum_{i=1}^{\frac…

Tree Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 11570   Accepted: 3626 Description Give a tree with n vertices,each edge has a length(positive integer less than 1001).  Define dist(u,v)=The min distance between node u and v.  Give a…

[POJ 2777] Count Color(线段树区间更新与查询) Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 40949   Accepted: 12366 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here…

[POJ 2486] Apple Tree(树型dp) Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8981   Accepted: 2990 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each…

[POJ 2750] Potted Flower(线段树套dp) Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4566   Accepted: 1739 Description The little cat takes over the management of a new park. There is a large circular statue in the center of the park, surrou…

2295: [POJ Challenge]我爱你啊 Time Limit: 1 Sec  Memory Limit: 128 MB Description ftiasch是个十分受女生欢迎的同学,所以她总是收到许多情书.虽然她十分有魅力,然而她却是个低调的人.因此她从来不会告诉别人她到底收到了多少情书. ftiasch的好朋友1tthinking想知道她到底收到了多少情书.1tthinking知道,ftiasch每次收到一封情书,就会在日记最后写下一个包含"luvletter"子序列的…

2288: [POJ Challenge]生日礼物 Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 382  Solved: 111[Submit][Status][Discuss] Description ftiasch 18岁生日的时候,lqp18_31给她看了一个神奇的序列 A1, A2, ..., AN. 她被允许选择不超过 M 个连续的部分作为自己的生日礼物. 自然地,ftiasch想要知道选择元素之和的最大值.你能帮助她吗?   Inp…

2288: [POJ Challenge]生日礼物 Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 284  Solved: 82[Submit][Status] Description ftiasch 18岁生日的时候,lqp18_31给她看了一个神奇的序列 A1, A2, ..., AN. 她被允许选择不超过 M 个连续的部分作为自己的生日礼物. 自然地,ftiasch想要知道选择元素之和的最大值.你能帮助她吗? Input 第1行,两个整数…