Submission #333312

#	Time	Username	Problem	Language	Result	Execution time	Memory
333312		katearima	Packing Biscuits (IOI20_biscuits)	C++14	100 / 100	487 ms	1516 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int k=61;
int i;
int nearest(ll u){
	vector<int> v;
	while(u>0){
		v.push_back(u%2);
		u/=2;
	}
	for(int i=v.size()-1; i>=0; i--){
		if(v[i]==1) return i; 
	}
	return -1;
}
long long count_tastiness(long long x, vector<long long> a) {
	vector<ll> s(k+1),ans(k+1), s1(k+1);
	int n=a.size();
	for(i=0; i<n; i++){
		ll p=pow(2,i);
		//s[i]=(long long)((double)a[i]/x*pow(2,i));
		s[i]=a[i]*p/x;
		s1[i]=((a[i]%x)*((ll)pow(2,i)%x))%x;
	}

	for(i=1; i<k; i++){
		s[i]+=s[i-1];
		s1[i]+=s1[i-1];
		s[i]+=s1[i]/x;
		s1[i]%=x;
	}
    ans[0]=1;
    for(i=1; i<k; i++){
    	ans[i]+=ans[i-1];
    	int j=i-1;
    	ll c=1; ll p;
    	int t=0;
		while(c>0){
   			p=pow(2,j);
   			
			if(t==0) c=min(s[j],2*p-1)-p; 
			else c=min(s[j], c)-p;
    		if(c==0){
				ans[i]++;
				break;
			}
			if(c<0) break;
			//if(i==58) cout<<c<<endl;
			j=nearest(c);
    		ans[i]+=ans[j];
    		t++;
    	}
    	//cout<<i<<" "<<ans[i]<<endl;
	}
	return ans[k-1];
	return 0;
}

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