递推 | codekun

CodeForces 660E – Different Subsets For All Tuples [DP]

Link 传送门 Problem For a sequence a of n integers between 1 and m, inclusive, denote f(a) as the number of distinct subsequences of a (including the empty subsequence). You are given two positive integers n and m. Let S be the set of all sequenc...

04月25日, 2016 爆米 1,451 views次 0

CodeForces 660E – Different Subsets For All Tuples [DP]

04月25日, 2016 1,451 views次

Link 传送门 Problem For a sequence a of n integers between 1 and m, inclusive, denote f(a) as the number of distinct subsequences of a (including ...

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动态规划未分类

HDU 5642 – King’s Order [数位DP]

Link 传送门 Problem After the king’s speech , everyone is encouraged. But the war is not over. The king needs to give orders from time to time. But sometimes he can not speak things well. So in his order there are some ones like this: “...

03月13日, 2016 爆米 1,056 views次 0

HDU 5642 – King’s Order [数位DP]

03月13日, 2016 1,056 views次

Link 传送门 Problem After the king’s speech , everyone is encouraged. But the war is not over. The king needs to give orders from time to tim...

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数据结构

UVa 12174 – Shuffle [滑动窗口]

Link 传送门 Problem You are listening to your music collection using the shuffle function to keep the music surprising. You assume that the shuffle algorithm of your music player makes a random permutation of the songs in the playlist and plays th...

02月1日, 2016 爆米 1,728 views次 0

UVa 12174 – Shuffle [滑动窗口]

02月1日, 2016 1,728 views次

Link 传送门 Problem You are listening to your music collection using the shuffle function to keep the music surprising. You assume that the shuffle...

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Java 动态规划数学

ZOJ 2317 – Nice Patterns Strike Back [DP+矩阵+Java大数]

Link 点击打开zoj题目链接 Problem You might have noticed that there is the new fashion among rich people to have their yards tiled with black and white tiles, forming a pattern. The company Broken Tiles is well known as the best tiling company in o...

11月9日, 2015 爆米 1,458 views次 0

ZOJ 2317 – Nice Patterns Strike Back [DP+矩阵+Java大数]

11月9日, 2015 1,458 views次

Link 点击打开zoj题目链接 Problem You might have noticed that there is the new fashion among rich people to have their yards tiled with black and wh...

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基础算法数学

CodeForces 288B – Polo the Penguin and Houses [推公式]

点击打开codeforces题目链接题意有N个店铺，每个店铺门牌上都写着一个数字x，表示某人到此的下一站是x。求满足下列条件的情况数： ① 从1～K的某个店铺出发能够回到1 ② 从1号回到1号时，中间必须经过其他店铺 ③ 从K+1～N号店铺走必须回不到1号店铺. 分析现在想想...

08月30日, 2015 爆米 1,121 views次 0

CodeForces 288B – Polo the Penguin and Houses [推公式]

08月30日, 2015 1,121 views次

点击打开codeforces题目链接题意有N个店铺，每个店铺门牌上都写着一个数字x，表示某人到此的下一站是x。求满足下列条件的情况数： ① 从1～K的某个店铺出发...

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数学

UVa 1646 – Edge Case [规律+大数]

点击打开vjudge题目链接题意：n个节点组成一个圈，求匹配（即没有公共点的边集）个数。分析：找规律，n=3时答案是4，n=4时答案是7，画画图递推一下发现n=5时答案是11，n=6时答案是18…类似于斐波那契数列。因为并没有取模，需要大数，直接上java. import ja...

08月21日, 2015 爆米 1,661 views次 0

UVa 1646 – Edge Case [规律+大数]

08月21日, 2015 1,661 views次

点击打开vjudge题目链接题意：n个节点组成一个圈，求匹配（即没有公共点的边集）个数。分析：找规律，n=3时答案是4，n=4时答案是7，画画图递推一下发现n=5...

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基础算法数学

HDU 1165 – Eddy’s research II [推公式]

vjudge题目连接 Description As is known, Ackermann function plays an important role in the sphere of theoretical computer science. However, in the other hand, the dramatic fast increasing pace of the function caused the value of Ackermann functio...

07月5日, 2015 爆米 944 views次 0

HDU 1165 – Eddy’s research II [推公式]

07月5日, 2015 944 views次

vjudge题目连接 Description As is known, Ackermann function plays an important role in the sphere of theoretical computer science. However, in the...

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基础算法

FZU 2056 – 最大正方形 [二分+递推]

vjudge链接：http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=29392 Description 现在有一个n*m的矩阵A，在A中找一个H*H的正方形，使得其面积最大且该正方形元素的和不大于 limit。 Input 第一行一个整数T，表示有T组数据。每组数据第一...

05月17日, 2015 爆米 1,521 views次 0