給定買的順序，即按順序必須是一路買過去，當選定買的東西物品序列後，付出錢後，貨主是不會找零錢的。現但願買完所須要的東西后，留下的錢越多越好，若是不能完成購買任務，輸出-1this
#include<cstdio>
#include<cstring>
#include<cctype>
#include<algorithm>
using namespace std;
#define rep(i,s,t) for(int i=s;i<=t;i++)
#define dwn(i,s,t) for(int i=s;i>=t;i--)
#define clr(x,c) memset(x,c,sizeof(x))
int read(){
int x=0;char c=getchar();
while(!isdigit(c)) c=getchar();
while(isdigit(c)) x=x*10+c-'0',c=getchar();
return x;
}
const int nmax=20;
const int maxn=1e5+5;
const int inf=0x7f7f7f7f;
int a[nmax],b[maxn],dp[maxn],n,m,sm;
int find(int x,int eo){
if(x==m) return 0;
int l=x,r=m,ans=0,mid;
while(l<=r){
mid=(l+r)>>1;
if(b[mid]-b[x]<=eo) ans=mid,l=mid+1;
else r=mid-1;
}
return ans-x;
}
int main(){
n=read(),m=read(),sm=0;
rep(i,1,n) a[i]=read(),sm+=a[i];
rep(i,1,m) b[i]=read()+b[i-1];
int se=(1<<n)-1,tm=0,ans=-1;
rep(i,1,se){
tm=0;
rep(j,1,n) if(i&(1<<(j-1))) dp[i]=max(dp[i],dp[i-(1<<(j-1))]+find(dp[i-(1<<j-1)],a[j])),tm+=a[j];
if(dp[i]==m) ans=max(ans,sm-tm);
//printf("%d:%d\n",i,dp[i]);
}
printf("%d\n",ans);return 0;
}
Farmer John is at the market to purchase supplies for his farm. He has in his pocket K coins (1 <= K <= 16), each with value in the range 1..100,000,000. FJ would like to make a sequence of N purchases (1 <= N <= 100,000), where the ith purchase costs c(i) units of money (1 <= c(i) <= 10,000). As he makes this sequence of purchases, he can periodically stop and pay, with a single coin, for all the purchases made since his last payment (of course, the single coin he uses must be large enough to pay for all of these). Unfortunately, the vendors at the market are completely out of change, so whenever FJ uses a coin that is larger than the amount of money he owes, he sadly receives no changes in return! Please compute the maximum amount of money FJ can end up with after making his N purchases in sequence. Output -1 if it is impossible for FJ to make all of his purchases.blog
K個硬幣，要買N個物品。ip
給定買的順序，即按順序必須是一路買過去，當選定買的東西物品序列後，付出錢後，貨主是不會找零錢的。現但願買完所須要的東西后，留下的錢越多越好，若是不能完成購買任務，輸出-1rem
Line 1: Two integers, K and N.get
* Lines 2..1+K: Each line contains the amount of money of one of FJ's coins.string
* Lines 2+K..1+N+K: These N lines contain the costs of FJ's intended purchases. it
* Line 1: The maximum amount of money FJ can end up with, or -1 if FJ cannot complete all of his purchases.