USACO Section 3.3 Shopping Offers - 多重背包
2011-12-31 23:35
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看题目所给的数据范围...最多5种物品..每个物品最多拿5个..那么实际上总状态数最多也就6^5=7776种..并且每种状态可以表示成一个5位的6进制数..每种优惠方案也可以表示成一个5位的6进制数...想到了这里题目就简单了..由于优惠方案是可以多次使用的...所以做一次多重背包可以搞定...我为了方便..就把每个状态都转化成了十进制数...这样感觉更加直观和方便...
/* ID: zzyzzy12 LANG: C++ TASK: shopping */ #include<iostream> #include<istream> #include<stdio.h> #include<string.h> #include<math.h> #include<stack> #include<algorithm> #include<queue> #define oo 1000000000 #define ll long long using namespace std; struct node { int num,a[6][6],p; }s[105]; struct node1 { int p,k; }products[5]; int n,m,dp[80000],t[1005],goal,_6jie[6]; void make_dp() { int h[5],i,j,y,x,temp; memset(dp,0x7f,sizeof(dp)); if (!m) { dp[goal]=0; return; } for (i=1;i<=goal;i++) { y=0; x=i; for (j=0;j<5;j++) { temp=x%6; if (temp>products[j].k) goto A; y+=temp*products[j].p; x/=6; } dp[i]=y; A: ; } for (i=1;i<=n;i++) { temp=0; for (j=1;j<=s[i].num;j++) temp+=_6jie[t[s[i].a[j][0]]]*s[i].a[j][1]; if (dp[temp]>s[i].p) dp[temp]=s[i].p; for (j=1;j<=goal-temp;j++) if (dp[j+temp]-dp[j]>s[i].p) dp[j+temp]=dp[j]+s[i].p; } } int main() { freopen("shopping.in","r",stdin); freopen("shopping.out","w",stdout); memset(products,0,sizeof(products)); scanf("%d",&n); int i,j; for (i=1;i<=n;i++) { scanf("%d",&s[i].num); for (j=1;j<=s[i].num;j++) scanf("%d%d",&s[i].a[j][0],&s[i].a[j][1]); scanf("%d",&s[i].p); } _6jie[0]=1; for (i=1;i<6;i++) _6jie[i]=6*_6jie[i-1]; goal=0; scanf("%d",&m); for (i=0;i<m;i++) { scanf("%d",&j); t[j]=i; scanf("%d%d",&products[i].k,&products[i].p); goal+=_6jie[i]*products[i].k; } make_dp(); printf("%d\n",dp[goal]); return 0; }
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