usaco-3.4-rockers-passed

又是一个背包问题，动态规划求解：

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

#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>
#include <queue>
#include <stack>
#include <algorithm>
using namespace std;

#define nmax 27

int n,t,m;
int d[nmax][nmax];

void test()
{    
    freopen("rockers.in","r",stdin);
    freopen("rockers.out","w",stdout);  
    cin>>n>>t>>m;
    int x;
    for(int i=1;i<=n;++i)
    {
        cin>>x;
        for(int j=m;j>0;--j)
            for(int k=t;k>=x;--k)
            {
                int& ans=d[j][k];
                if(ans<d[j-1][t]+1)ans=d[j-1][t]+1;
                if(ans<d[j][k-x]+1)ans=d[j][k-x]+1;
            }
    }
    cout<<d[m][t]<<endl;
}

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

test data:

USACO Training
Grader Results     
18 users online
CHN/7 GEO/3 IND/2 IRN/1 MAC/1 MKD/1 MYS/1 USA/2

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

Compiling...
Compile: OK

Executing...
   Test 1: TEST OK [0.003 secs, 3372 KB]
   Test 2: TEST OK [0.008 secs, 3372 KB]
   Test 3: TEST OK [0.008 secs, 3372 KB]
   Test 4: TEST OK [0.008 secs, 3372 KB]
   Test 5: TEST OK [0.008 secs, 3372 KB]
   Test 6: TEST OK [0.008 secs, 3372 KB]
   Test 7: TEST OK [0.005 secs, 3372 KB]
   Test 8: TEST OK [0.008 secs, 3372 KB]
   Test 9: TEST OK [0.011 secs, 3372 KB]
   Test 10: TEST OK [0.005 secs, 3372 KB]
   Test 11: TEST OK [0.005 secs, 3372 KB]
   Test 12: TEST OK [0.008 secs, 3372 KB]

All tests OK.

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

Here are the test data inputs:

------- test 1 ----
4 5 2
4 2 4 3
------- test 2 ----
1 1 5
6
------- test 3 ----
10 5 5
5 3 5 3 5 3 5 3 5 2
------- test 4 ----
10 10 9
9 7 8 6 10 9 8 6 5 9
------- test 5 ----
9 15 4
15 7 8 6 9 5 10 4 11
------- test 6 ----
15 10 1
3 6 7 9 6 8 6 7 5 8 10 7 6 3 4
------- test 7 ----
20 20 2
10 15 19 18 11 15 14 16 12 14 15 10 10 16 14 16 14 15 16 10
------- test 8 ----
20 20 10
18 15 16 10 2 20 14 17 3 7 16 15 18 16 20 16 13 9 4 16
------- test 9 ----
18 10 6
4 9 6 3 9 7 6 9 4 1 10 9 5 8 5 4 7 6
------- test 10 ----
10 10 20
8 3 6 4 10 8 2 9 5 10
------- test 11 ----
20 20 5
4 9 2 19 5 3 10 15 18 4 3 9 14 17 1 20 15 19 12 6
------- test 12 ----
20 20 10
19 15 1 5 6 19 15 18 13 19 18 5 3 6 2 6 19 13 15 16

Keep up the good work!
Thanks for your submission!