Each level of the red-green tower should contain blocks of the same color. Let h be the maximum possible number of levels of red-green tower, that can be built out of r red and ggreen blocks meeting the rules above. The task is to determine how many different red-green towers having...
然后遍历状态的时候用一个 \(vis\) 数组判断一下是不是最后一层(如果这一层扩展不出来任何新的状态,那么这一层的上一层就是最后一层)。 示例代码: #include <bits/stdc++.h> using namespace std; const int maxn = 200020; const long long MOD = 1000000007LL; int r, g; long long f[2][maxn...
CF478D Red-Green Towers 题解 动态规划 题目链接:https://codeforces.com/problemset/problem/478/D 解题思路: 定义f[i][j]f[i][j] 表示第 ii 层并且总使用了 jj 个红色格子的方案总数。 则:f[i][j]=f[i−1][j]+f[i−1][j−h]f[i][j]=f[i−1][j]+f[i−1][j−h](...
constintN=2e5+100;intdp[N];/** */intmain(){// freopen("D://rush.txt","r",stdin);ios::sync_with_stdio(false);intr,g; cin>>r>>g;inth=1;while(h*(h+1)/2<=r+g) h++; h--;intsum=h*(h+1)/2;// cout<<h<<endl;dp[0]=1;for(inti=1;i<=h;i++) {for(intj=r...
Two red-green towers are considered different if there exists some level, that consists of red blocks in the one tower and consists of green blocks in the other tower. You are to write a program that will find the number of different red-green towers of height h modulo 109 +...
To start it has a star-studded cast, Bruce Willis (Die Hard, Pulp Fiction), Morgan Freeman (The Shawshank Redemption, Se7en), John Malkovich (Dangerous Liaisons, Burn After Reading), Helen Mirren (The Queen, Excalibur) and Karl Urban (Star Trek, The Lord of the Rings: The Two Towers)....
On this walk, they saw most of the old city buildings of Beijing, like the Forbidden City and the Bell and Drum Towers.”可知作者提到林姓的北京人是为了引出文章的主题——北京中轴线。故选B。 (2)题详解: 推理判断题。根据“On this walk, they saw most of the old city buildings of ...
根据第一段“The red walls and green tiles set each other off beautifully. It’s so Beijing,”可知,此处描述了红墙绿瓦的美丽景象,这符合北方的地方特色和风情;据此可推断划线部分“It’s so Beijing”意为“这非常有北京特色”。故选B。 (2)题详解: 细节理解题。根据第二段“The Beijing Central ...
On this walk, they saw most of the old city buildings of Beijing, like the Forbidden City and the Bell and Drum towers.”可知沿着中轴线可以看到北京大部分的古城建筑,比如紫禁城和钟鼓楼。故选C。 (2)题详解: 细节理解题。根据“Chinese teacher Lu Zhou said that when he walked around the ...
Each level of the red-green tower should contain blocks of the same color. Let h be the maximum possible number of levels of red-green tower, that can be built out of r red and g green blocks meeting the rules above. The task is to determine how many different red-green towers having...