hdu1087Super Jumping! Jumping! Jumping!(dp)

http://acm.hdu.edu.cn/showproblem.php?pid=1087

7A。。。。简单的递推 没考虑负数的情况 一直乱改。。

View Code

 1 #include <iostream>

 2 #include<cstdio>

 3 #include<string.h>

 4 #define INF 0xfffffff

 5 using namespace std;

 6 long long dp[1011],a[1011];

 7 int main()

 8 {

 9     int i,j,k,n,m;

10     while(scanf("%d",&n)&&n)

11     {

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

13         for(i = 1; i <= n ; i++)

14         scanf("%lld",&a[i]);

15         dp[0] = 0;

16         long long max = 0;

17         for(i = 1; i <= n; i++)

18         {

19             long long tmax = 0;

20             if(a[i]<=0)

21             {

22                 dp[i] = 0;

23                 continue;

24             }

25             for(j = 0; j <i ; j++)

26             {

27                 if(a[i]>a[j]&&a[j]>=0&&dp[j]+a[i]>tmax)

28                     tmax = dp[j]+a[i];

29             }

30             dp[i] = tmax;

31             if(tmax>max)

32             max = tmax;

33         }

34         printf("%lld\n",max);

35     }

36     return 0;

37 }