2021沈阳 D. Journey to Un‘Goro 简简单单打个表

https://codeforces.com/gym/103202/problem/D
1.首先对于ans来说，最大值为全r
容易求得：

ll res = 0;for(ll i = 1;i <= n;i += 2){res += n - i + 1;}

打表发现：


每个答案的前n / 2 + 1都是rr不断向前移动，故n >= 200的情况解决
观察表尾部可以发现
偶数的情况下之后的尾部形式都为：{“bbbbbbbbbbbbbbr”,“bbbbbbbbbbbbbrb”,“bbbbbbbbbbbbbrr”,“bbbbbbbbbbbbrbr”,“bbbbbbbbbbbbrrb”,“bbbbbbbbbbbbrrr”,这样
奇数都为：
{“bbbbbbbbbbbbrb”,“bbbbbbbbbbbrbr”,“bbbbbbbbbbbrrr”,“bbbbbbbbbbrbrb”,“bbbbbbbbbbrrbr”,"bbbbbbbbbbrrr
打表出一些后缀，然后输出
并且可以暴力或者打表输出较小的n的情况

#include <bits/stdc++.h>
using namespace std;
const int Mn = 1e5 +5;
#define ll long long
ll n;
ll res;
string sans[28][100] = {{"r"},
{"br","rb","rr"},
{"brb","rbr","rrr"},
{"bbrb","brbb","brbr","brrr","rbbr","rbrb","rbrr","rrbr","rrrb","rrrr"},
{"bbrbb","brbbr","brbrr","brrrb","rbbrb","rbrbr","rbrrr","rrbrb","rrrbr","rrrrr"},
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void cal(ll n){ll res = 0;for(ll i = 1;i <= n;i += 2){res += n - i + 1;}cout<<res<<'\n';}
string ji[100] = {"bbbbbbbbbbbbrb","bbbbbbbbbbbrbr","bbbbbbbbbbbrrr","bbbbbbbbbbrbrb","bbbbbbbbbbrrbr","bbbbbbbbbbrrrr","bbbbbbbbbrbrbb","bbbbbbbbbrrbbr","bbbbbbbbbrrbrr","bbbbbbbbbrrrrb","bbbbbbbbrbrbbb","bbbbbbbbrrbbbr","bbbbbbbbrrbbrr","bbbbbbbbrrbrrb","bbbbbbbbrrrrbb","bbbbbbbrbrbbbb","bbbbbbbrrbbbbr","bbbbbbbrrbbbrr","bbbbbbbrrbbrrb","bbbbbbbrrbrrbb","bbbbbbbrrrrbbb","bbbbbbrbrbbbbb","bbbbbbrrbbbbbr","bbbbbbrrbbbbrr","bbbbbbrrbbbrrb","bbbbbbrrbbrrbb","bbbbbbrrbrrbbb","bbbbbbrrrrbbbb","bbbbbrbrbbbbbb","bbbbbrrbbbbbbr","bbbbbrrbbbbbrr","bbbbbrrbbbbrrb","bbbbbrrbbbrrbb","bbbbbrrbbrrbbb","bbbbbrrbrrbbbb","bbbbbrrrrbbbbb","bbbbrbrbbbbbbb","bbbbrrbbbbbbbr","bbbbrrbbbbbbrr","bbbbrrbbbbbrrb","bbbbrrbbbbrrbb","bbbbrrbbbrrbbb","bbbbrrbbrrbbbb","bbbbrrbrrbbbbb","bbbbrrrrbbbbbb","bbbrbrbbbbbbbb","bbbrrbbbbbbbbr","bbbrrbbbbbbbrr","bbbrrbbbbbbrrb","bbbrrbbbbbrrbb","bbbrrbbbbrrbbb","bbbrrbbbrrbbbb","bbbrrbbrrbbbbb","bbbrrbrrbbbbbb","bbbrrrrbbbbbbb","bbrbrbbbbbbbbb","bbrrbbbbbbbbbr","bbrrbbbbbbbbrr","bbrrbbbbbbbrrb","bbrrbbbbbbrrbb","bbrrbbbbbrrbbb","bbrrbbbbrrbbbb","bbrrbbbrrbbbbb","bbrrbbrrbbbbbb","bbrrbrrbbbbbbb","bbrrrrbbbbbbbb","brbrbbbbbbbbbb","brrbbbbbbbbbbr","brrbbbbbbbbbrr","brrbbbbbbbbrrb","brrbbbbbbbrrbb","brrbbbbbbrrbbb","brrbbbbbrrbbbb","brrbbbbrrbbbbb","brrbbbrrbbbbbb","brrbbrrbbbbbbb","brrbrrbbbbbbbb","brrrrbbbbbbbbb","rbrbbbbbbbbbbb","rrbbbbbbbbbbbr","rrbbbbbbbbbbrr","rrbbbbbbbbbrrb","rrbbbbbbbbrrbb","rrbbbbbbbrrbbb"};
string ou[100] = {"bbbbbbbbbbbbbbr","bbbbbbbbbbbbbrb","bbbbbbbbbbbbbrr","bbbbbbbbbbbbrbr","bbbbbbbbbbbbrrb","bbbbbbbbbbbbrrr","bbbbbbbbbbbrbrb","bbbbbbbbbbbrrbb","bbbbbbbbbbbrrbr","bbbbbbbbbbbrrrr","bbbbbbbbbbrbrbb","bbbbbbbbbbrrbbb","bbbbbbbbbbrrbbr","bbbbbbbbbbrrbrr","bbbbbbbbbbrrrrb","bbbbbbbbbrbrbbb","bbbbbbbbbrrbbbb","bbbbbbbbbrrbbbr","bbbbbbbbbrrbbrr","bbbbbbbbbrrbrrb","bbbbbbbbbrrrrbb","bbbbbbbbrbrbbbb","bbbbbbbbrrbbbbb","bbbbbbbbrrbbbbr","bbbbbbbbrrbbbrr","bbbbbbbbrrbbrrb","bbbbbbbbrrbrrbb","bbbbbbbbrrrrbbb","bbbbbbbrbrbbbbb","bbbbbbbrrbbbbbb","bbbbbbbrrbbbbbr","bbbbbbbrrbbbbrr","bbbbbbbrrbbbrrb","bbbbbbbrrbbrrbb","bbbbbbbrrbrrbbb","bbbbbbbrrrrbbbb","bbbbbbrbrbbbbbb","bbbbbbrrbbbbbbb","bbbbbbrrbbbbbbr","bbbbbbrrbbbbbrr","bbbbbbrrbbbbrrb","bbbbbbrrbbbrrbb","bbbbbbrrbbrrbbb","bbbbbbrrbrrbbbb","bbbbbbrrrrbbbbb","bbbbbrbrbbbbbbb","bbbbbrrbbbbbbbb","bbbbbrrbbbbbbbr","bbbbbrrbbbbbbrr","bbbbbrrbbbbbrrb","bbbbbrrbbbbrrbb","bbbbbrrbbbrrbbb","bbbbbrrbbrrbbbb","bbbbbrrbrrbbbbb","bbbbbrrrrbbbbbb","bbbbrbrbbbbbbbb","bbbbrrbbbbbbbbb","bbbbrrbbbbbbbbr","bbbbrrbbbbbbbrr","bbbbrrbbbbbbrrb","bbbbrrbbbbbrrbb","bbbbrrbbbbrrbbb","bbbbrrbbbrrbbbb","bbbbrrbbrrbbbbb","bbbbrrbrrbbbbbb","bbbbrrrrbbbbbbb","bbbrbrbbbbbbbbb","bbbrrbbbbbbbbbb","bbbrrbbbbbbbbbr","bbbrrbbbbbbbbrr","bbbrrbbbbbbbrrb","bbbrrbbbbbbrrbb","bbbrrbbbbbrrbbb","bbbrrbbbbrrbbbb","bbbrrbbbrrbbbbb","bbbrrbbrrbbbbbb","bbbrrbrrbbbbbbb","bbbrrrrbbbbbbbb","bbrbrbbbbbbbbbb","bbrrbbbbbbbbbbb","bbrrbbbbbbbbbbr","bbrrbbbbbbbbbrr","bbrrbbbbbbbbrrb"};
int www[28] = {1,3,3,10,10,35,35,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100};
int main()
{//freopen("ans.txt","w",stdout);//scanf("%lld\n",&n);ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);cin>>n;cal(n);if(n <= 28){for(int i = 0;i < www[n - 1];i ++){cout<<sans[n - 1][i]<<'\n';}}else{for(int i = 1;i <= n;i ++){if(i == n / 2 + 1) cout<<'r';else cout<<'b';}cout<<'\n';if(n % 2 == 0){for(int i = 1;i <= n;i ++){if(i == n / 2) cout<<'r';else cout<<'b';}cout<<'\n';}for(int i = 1;i < n;i ++){if(i == n / 2) cout<<'r';else cout<<'b';}cout<<'r';cout<<'\n';int now = n - 1;int wpc = 2;if(n % 2 == 0) wpc ++;while(now != n / 2){wpc ++;for(int i = 1;i <= n;i ++){if(i == n / 2) cout<<'r';else if(i == now){i ++;cout<<"rr";}else cout<<'b';}now --;cout<<'\n';if(wpc == 100) return 0;}int x = 0;while(1){wpc ++;if(n & 1)for(int i = 1;i <= n - 14;i ++){if(i == n / 2 - 1) cout<<'r';else cout<<'b';}elsefor(int i = 1;i <= n - 15;i ++){if(i == n / 2 - 1) cout<<'r';else cout<<'b';}if(n & 1)cout<<ji[x ++]<<'\n';else cout<<ou[x ++]<<'\n';//cout<<wpc<<'\n';if(wpc == 100) return 0;}}return 0;
}