usaco-2.3-nocows-passed

呵呵，搞了半天，也没有搞明白，网上参考了一下成功者，下来再仔细研究下。

/*
ID: qq104801
LANG: C++
TASK: nocows
*/

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <cstdio>
#include <algorithm>

using namespace std;
int n,k;
int d[201][101];

void test()
{    
    freopen("nocows.in","r",stdin);
    freopen("nocows.out","w",stdout);
    cin>>n>>k;
    d[1][0]=1;d[1][1]=1;
    int i,j,p,q,res=0;
    for(i=3;i<=n;i+=2)
    {
        int upper=i>>1;
        for(j=1;j<=upper;j+=2)
            for(p=1;p<=d[j][0];++p)
                for(q=1;q<=d[i-1-j][0];++q)
                {
                    if(d[j][p] && d[i-1-j][q])
                    {
                        int height=(p>q?p:q)+1;
                        if(height>d[i][0])
                            d[i][0]=height;
                        res=(d[j][p]*d[i-1-j][q])<<1;
                        if(i-1-j==j)
                            res>>=1;
                        d[i][height]=(d[i][height]+res)%9901;
                    }
                }
    }
    cout<<d[n][k]%9901<<endl; 
}

int main () 
{        
    test();        
    return 0;
}

test data:

USER: cn tom [qq104801]
TASK: nocows
LANG: C++

Compiling...
Compile: OK

Executing...
   Test 1: TEST OK [0.003 secs, 3448 KB]
   Test 2: TEST OK [0.003 secs, 3448 KB]
   Test 3: TEST OK [0.003 secs, 3448 KB]
   Test 4: TEST OK [0.008 secs, 3448 KB]
   Test 5: TEST OK [0.005 secs, 3448 KB]
   Test 6: TEST OK [0.011 secs, 3448 KB]
   Test 7: TEST OK [0.027 secs, 3448 KB]
   Test 8: TEST OK [0.022 secs, 3448 KB]
   Test 9: TEST OK [0.024 secs, 3448 KB]
   Test 10: TEST OK [0.022 secs, 3448 KB]
   Test 11: TEST OK [0.038 secs, 3448 KB]
   Test 12: TEST OK [0.043 secs, 3448 KB]

All tests OK.

YOUR PROGRAM ('nocows') WORKED FIRST TIME! That's fantastic -- and a rare thing. Please accept these special automated congratulations.

Here are the test data inputs:

------- test 1 ----
5 3
------- test 2 ----
9 4
------- test 3 ----
35 7
------- test 4 ----
15 4
------- test 5 ----
75 47
------- test 6 ----
99 15
------- test 7 ----
172 44
------- test 8 ----
165 65
------- test 9 ----
177 57
------- test 10 ----
198 56
------- test 11 ----
199 99
------- test 12 ----
199 77

Keep up the good work!
Thanks for your submission!