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\n",ans1); inc(i,1,n)printf("%lld\n",ans2[i]); 30 }
20160811