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  • bzoj2016[Usaco2010]Chocolate Eating*

    bzoj2016[Usaco2010]Chocolate Eating

    题意:

    n块巧克力,每次吃可以增加ai点快乐,每天早晨睡觉起来快乐值会减半,求如何使d天睡觉前的最小快乐值最大。n,d≤50000

    题解:

    二分快乐值,每天不够就吃。注意如果最后一天有剩余巧克力,必须将其全部吃完。

    代码:

     1 #include <cstdio>
     2 #include <cstring>
     3 #include <algorithm>
     4 #define ll long long
     5 #define inc(i,j,k) for(int i=j;i<=k;i++)
     6 #define maxn 100010
     7 using namespace std;
     8 
     9 inline ll read(){
    10     char ch=getchar(); ll f=1,x=0;
    11     while(ch<'0'||ch>'9'){if(ch=='-')f=-1; ch=getchar();}
    12     while(ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
    13     return f*x;
    14 }
    15 int n,d,bel[maxn]; ll h[maxn],ans1,ans2[maxn];
    16 bool check(ll x){
    17     ll hap=0; int p=1;
    18     inc(i,1,d){
    19         while(hap<x&&p<=n)hap+=h[p],bel[p]=i,p++; if(hap<x)return 0; hap>>=1;
    20     }
    21     while(p<=n)bel[p]=d,p++; inc(i,1,n)ans2[i]=bel[i]; ans1=x; return 1;
    22 }
    23 int main(){
    24     n=read(); d=read(); inc(i,1,n)h[i]=read();
    25     ll l=1,r=50000000000LL;
    26     while(l<=r){
    27         ll mid=(l+r)>>1; if(check(mid))l=mid+1;else r=mid-1;
    28     }
    29     printf("%lld
    ",ans1); inc(i,1,n)printf("%lld
    ",ans2[i]);
    30 }

    20160811

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  • 原文地址:https://www.cnblogs.com/YuanZiming/p/5771570.html
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