hdu 1203 I NEED A OFFER!

http://acm.hdu.edu.cn/showproblem.php?pid=1203

 1 #include <cstdio>

 2 #include <cstring>

 3 #include <algorithm>

 4 using namespace std;

 5 

 6 int a[20000];

 7 double b[20000],dp[20000];

 8 int n,m;

 9 

10 int main()

11 {

12     while(scanf("%d%d",&n,&m)!=EOF)

13     {

14         memset(dp,0,sizeof(dp));

15         if(n==0&&m==0) break;

16         for(int i=1; i<=m; i++)

17         {

18             scanf("%d%lf",&a[i],&b[i]);

19             b[i]=1-b[i];

20         }

21         for(int i=0; i<=n; i++)

22         {

23             dp[i]=1;

24         }

25         for(int i=1; i<=m; i++)

26         {

27             for(int j=n; j>=a[i]; j--)

28             {

29                 dp[j]=min(dp[j],dp[j-a[i]]*b[i]);

30             }

31         }

32         printf("%.1lf%%\n",(1-dp[n])*100);

33     }

34     return 0;

35 }

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