Submission #1052530

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052530		noyancanturk	Packing Biscuits (IOI20_biscuits)	C++17	44 / 100	10 ms	968 KiB

biscuits

#include "biscuits.h"

#include <bits/stdc++.h>
using namespace std;

using lint=long long;
using llint=__int128_t;

llint inf=1e20;

lint count_tastiness(lint x,vector<lint> a) {
	int n=a.size();
	llint b[n+31]{};
	llint need[n+31];
	need[0]=x;
	for(int i=1;i<n+31;i++){
		need[i]=need[i-1]*2;
	}
	for(int i=0;i<n+31;i++){
		if(i<n)b[i]+=a[i];
		if(x<b[i]){
			b[i+1]=(b[i]-x)/2;
			b[i]=x+((b[i]-x)&1);
		}
		//cerr<<lint(b[i])<<" ";
	}//cerr<<"\n";
	llint dp[n+31]{};
	llint dppref[n+31];
	for(int i=0;i<n+31;i++){
		if(x<=b[i]){
			if(i)dp[i]=dppref[i-1];
			else dp[i]=1;
		}else{
			dp[i]=0;
			llint neednow=x;
			for(int j=i;0<=j;j--){
				neednow-=b[j];
				if(neednow<=0){
					neednow=x+neednow;
					if(neednow<=0){
						dp[i]+=dppref[j];
						break;
					}else if(j)dp[i]+=dppref[j-1];
					else dp[i]++;
				}
				neednow*=2;
				if(inf<neednow)break;
			}
		}
		dppref[i]=dp[i];
		if(i)dppref[i]+=dppref[i-1];
		else dppref[i]++;
	}
	llint ans=1;
	for(int i=0;i<n+31;i++){
		ans+=dp[i];
		//if(i<5)cerr<<lint(dp[i])<<" "<<lint(dppref[i])<<" "<<i<<" dpval\n";
	}
	return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 21
• Subtask 4: 35 / 35
• Subtask 5: 0 / 23