tyvj P1209 - 拦截导弹 平面图最小割&&模型转化

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
#define MAXN 1000
#define INF 0x3f3f3f3f
//AC
int num[MAXN];
int f[MAXN];
int main()
{
        freopen("input.txt","r",stdin);
        int i,j,k,x,y,z,n,m;
        n=1;
        while (scanf("%d,",&num[++n])>0);
        n--;
        int ans=0;
        num[0]=INF;
        for (i=1;i<=n;i++)
        {
                for (j=0;j<i;j++)
                {
                        if (num[j]>=num[i])
                                f[i]=max(f[i],f[j]+1);
                        ans=max(ans,f[i]);
                }
        }
        printf("%d,",ans);
        memset(f,0,sizeof(f));
        f[0]=0;
        ans=0;
        for (i=1;i<=n;i++)
        {
                for (j=0;j<i;j++)
                {
                        if (num[j]<num[i])
                                f[i]=max(f[i],f[j]+1);
                        ans=max(ans,f[i]);
                }
        }
        printf("%d\n",ans-1);
        return 0;
}