Submission #303919

#	Time	Username	Problem	Language	Result	Execution time	Memory
303919		Pajaraja	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	14 ms	896 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
#define MAXN 67
using namespace std;
long long dp[MAXN],dpu[MAXN],p[MAXN];
long long count_tastiness(long long x, std::vector<long long> a)
{
    int k=0;
    while((x<<k)<=3000000000000000000LL)
    {
        k++;
        if(k-1==a.size()) a.push_back(0);
    }
    p[0]=a[0];
    for(long long i=1;i<k;i++) p[i]=p[i-1]+(a[i]<<i);
    for(long long i=0;i<k;i++)
    {
        long long mx=(p[i]-(x<<i))/x;
        dpu[i]=0;
        if(p[i]>=(x<<i))
        {
            if(mx>=(1LL<<i)) dpu[i]=(i!=0)?dp[i-1]:1;
            else
            {
                bool fas=false;
                for(long long j=i-1;j>=0;j--) if((1LL<<j)&mx)
                {
                    dpu[i]+=(j!=0)?dp[j-1]:1;
                    long long nx=(p[j]-(x<<j))/x;
                    if(p[j]<(x<<j)) {fas=true; break;}
                    mx^=(1LL<<j);
                    if(nx<mx) {dpu[i]+=dpu[j]; fas=true; break;}
                }
                if(!fas) dpu[i]++;
            }
        }
        dp[i]=(i!=0)?dp[i-1]:1;
        dp[i]+=dpu[i];
    }
	return dp[k-1];
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:12:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |         if(k-1==a.size()) a.push_back(0);
      |            ~~~^~~~~~~~~~

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