[CodeVS 1044]拦截导弹
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第一问很显然是最长不升子序列，直接DP即可。
第二问咋整？暴力？网络流？
其实就是最长不降子序列。具体证明嘛……自己找吧。
代码：
#include <cstdio>
#include <algorithm>
using namespace std;
const int maxn=22;
int d[maxn],f[maxn];
int A[maxn];
int main(){
int n;
register int i,j,ans=0;
for(n=1;;n++)
if(scanf("%d",&A[n])!=1)
break;
n--;
for(i=1;i<=n;i++){
d[i]=1;
for(j=i-1;j>=1;j--)
if(A[j]>=A[i])
d[i]=max(d[i],d[j]+1);
ans=max(ans,d[i]);
}
printf("%d\n",ans);
ans=0;
for(i=1;i<=n;i++){
f[i]=1;
for(j=i-1;j>=1;j--)
if(A[j]<=A[i])
f[i]=max(f[i],f[j]+1);
ans=max(ans,f[i]);
}
printf("%d\n",ans);
return 0;
}
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