Submission #304361

#	Time	Username	Problem	Language	Result	Execution time	Memory
304361		QAQAutoMaton	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	14 ms	896 KiB

biscuits

#include "biscuits.h"
#include <algorithm>
#include <vector>
typedef long long ll;
std::vector<long long> a;
ll x;
ll s[105],f[105];
bool chkmin(ll &a,ll b){return a>b?a=b,1:0;}
ll dfs(int x,ll y){
	chkmin(y,s[x]);
	if(!x){return std::min(y,s[x])+1;}
	if(y<s[x-1])return dfs(x-1,y);
	if(s[x-1]+(1ll<<x)<=y)return f[x-1]<<1;
	if(y>=(1ll<<x))return f[x-1]+dfs(x-1,y-(1ll<<x));
	return f[x-1];
}
long long count_tastiness(long long X, std::vector<long long> A) {
	while(A.size()<60)A.emplace_back(0);
	x=X;a=A;
	int k=a.size();
	ll cur=0;
	for(int i=0;i<k;++i){
		s[i]=std::min((cur+=a[i]<<i)/x,(1ll<<(i+1))-1);
	}
	f[0]=s[0]+1;
	for(int i=1;i<k;++i){
		f[i]=dfs(i,(1ll<<(i+1))-1);
	}
	return f[k-1];
}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 21 / 21
• Subtask 4: 35 / 35
• Subtask 5: 23 / 23