POJ-2533 Longest Ordered Subsequence LIS

  题目链接:http://poj.org/problem?id=2533

  基本DP:f[i]=max{f[j]}+1。

 1 //STATUS:C++_AC_32MS_184KB

 2 #include<stdio.h>

 3 #include<stdlib.h>

 4 #include<string.h>

 5 #include<math.h>

 6 #include<iostream>

 7 #include<string>

 8 #include<algorithm>

 9 #include<vector>

10 #include<queue>

11 #include<stack>

12 using namespace std;

13 #define LL __int64

14 #define pii pair<int,int>

15 #define Max(a,b) ((a)>(b)?(a):(b))

16 #define Min(a,b) ((a)<(b)?(a):(b))

17 #define mem(a,b) memset(a,b,sizeof(a))

18 #define lson l,mid,rt<<1

19 #define rson mid+1,r,rt<<1|1

20 const int N=1010,INF=0x3f3f3f3f,MOD=1999997;

21 const LL LLNF=0x3f3f3f3f3f3f3f3fLL;

22 

23 int num[N],w[N],f[N];

24 int n;

25 

26 int main()

27 {

28  //   freopen("in.txt","r",stdin);

29     int i,j,ans;

30     while(~scanf("%d",&n))

31     {

32         ans=f[0]=1;

33         for(i=0;i<n;i++)

34             scanf("%d",&num[i]);

35         for(i=1;i<n;i++){

36             f[i]=1;

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

38                 if(num[j]<num[i])

39                     f[i]=Max(f[i],f[j]+1);

40             if(f[i]>ans)ans=f[i];

41         }

42 

43         printf("%d\n",ans);

44     }

45     return 0;

46 }

 

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