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  • CF580D Kefa and Dishes 题解2021-12-26 16:36:24

    Description Luogu传送门 Solution 好水的状压 \(dp\)…… 非常套路的状态,设 \(dp_{i, s}\) 表示吃了状态为 \(s\) 的菜,且最后一个吃的是 \(i\) 的最大满意度。 那么如何转移呢? 枚举状态 \(s\),枚举最后一个吃的 \(i\),再枚举倒数第二个吃的菜 \(j\ (i, j \in s)\)。 转移方程: \[dp_

  • C. Kefa and Park2021-08-12 14:02:10

    题意:Kefa想去餐厅,要穿过公园。公园由一棵树组成,有n个节点,叶子节点上是餐厅,每节点上可能有猫,Kefa害怕猫,当有连续m只猫出现时,就不能继续往下走了。我们需要找出Kefa能去多少家餐厅。 题解:dfs深搜,设置跳出条件:连续猫得数量超过m;或者已经走到了叶子节点(度为0的节点)。搜索所在点连接的

  • 2021-7-29 Kefa and Park2021-07-29 22:02:20

    难度 1500 题目 Codeforces: C. Kefa and Park time limit per test 2 seconds memory limit per test 256 megabytes   Kefa decided to celebrate his first big salary by going to the restaurant.   He lives by an unusual park. The park is a rooted tree consis

  • CF 580E Kefa and Watch2021-05-29 18:34:45

        #include<bits/stdc++.h> #define ull unsigned long long using namespace std; const int N=1000011; const ull St=233,M1=1000000007,M2=1000000009; int n,m,k; ull jc[N][2],jcs[N][2]; char s[N]; struct Node { int l,r; ull data[2],tag[2];

  • CF580C Kefa and Park2021-04-28 21:32:41

    本来以为是一个很简单的剪枝,谁知道一直过不去。 本来想通过判断入度等于一的点来判断是否为叶子节点,但这样是不正确的,因为可以构造出两点一边的数据,使得根节点的入度也为1,于是终于过了。 #include<iostream> #include<vector> using namespace std; int n, m, a[500000], vis[500

  • [CodeForces 580A] Kefa and First Steps2019-05-30 22:45:56

    题目链接:http://codeforces.com/problemset/problem/580/A AC代码: #include <iostream> #include <cstdio> using namespace std; const int maxn = 100005; int arr[maxn]; int n; int main() { while(scanf("%d",&n) != EOF) { int m

  • D - Kefa and Dishes CodeForces - 580D (状压dp)2019-04-14 13:48:24

    D - Kefa and Dishes  CodeForces - 580D  When Kefa came to the restaurant and sat at a table, the waiter immediately brought him the menu. There were n dishes. Kefa knows that he needs exactly m dishes. But at that, he doesn't want to order the same

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