bzoj5441: [Ceoi2018]Cloud computing
跟着大佬做题。。
这题也是有够神仙了。观察一下性质,c很小而f是一个限制条件(然而我并不会心态爆炸)
%了一发,就是把电脑和订单一起做背包,订单的c视为负而电脑的v为负,f由大到小排序做背包
#include<cstdio>
#include<iostream>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<cmath>
using namespace std;
typedef long long LL; struct node{int c,f;LL v;}a[];
bool cmp(node n1,node n2){return n1.f==n2.f?n1.c>n2.c:n1.f>n2.f;}
LL f[];
int main()
{
int n,m;
scanf("%d",&n);
for(int i=;i<=n;i++)
{
scanf("%d%d%lld",&a[i].c,&a[i].f,&a[i].v);
a[i].v=-a[i].v;
}
scanf("%d",&m);
for(int i=n+;i<=n+m;i++)
{
scanf("%d%d%lld",&a[i].c,&a[i].f,&a[i].v);
a[i].c=-a[i].c;
}
n+=m;
sort(a+,a+n+,cmp); int maxp=;LL lin;
memset(f,-,sizeof(f));f[]=;
lin=f[];
for(int i=;i<=n;i++)
{
if(a[i].c>)
{
for(int j=maxp;j>=;j--)
if(f[j]!=lin)
{
f[j+a[i].c]=max(f[j+a[i].c],f[j]+a[i].v);
if(j+a[i].c>maxp)maxp=j+a[i].c;
}
}
else
{
for(int j=-a[i].c;j<=maxp;j++)
if(f[j]!=lin)
f[j+a[i].c]=max(f[j+a[i].c],f[j]+a[i].v);
}
} LL ans=;
for(int i=;i<=maxp;i++)ans=max(ans,f[i]);
printf("%lld\n",ans);
return ;
}
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