Submission #303535

#	Time	Username	Problem	Language	Result	Execution time	Memory
303535		user202729	Packing Biscuits (IOI20_biscuits)	C++17	9 / 100	1135 ms	1051336 KiB

biscuits

// moreflags=grader.cpp
// naive solution (penultimate subtask)

#include "biscuits.h"
#include<cstdint>
#include<vector>
#include<cmath>
#include<iostream>

long long count_tastiness(long long x, std::vector<long long> a) {
	std::vector<int64_t> all{a[0]};
	int64_t s=0;
	for(int i=0;; ++i){
		/*
		for(auto y: all) std::cout<<((y-s)>>std::min(i, 62))<<' ';
		std::cout<<"  << \n";
		*/

		// optional subtract x
		if(all[0]-x*std::round(std::pow(2., i))>=s){
			// ^ check to avoid x<<i overflows int64_t (which is actually what happened to me in the contest)
			for(int n=(int)all.size(), index=0; index<n;++index)
				if(
						all[index]-(x<<i)
						>=s
				  )
					all.push_back(all[index]-(x<<i));
				else break;
		}

		if(i+1<(int)a.size())
			s-=a[i+1]<<(i+1);

		if(i==a.size()+62){ // +62 is actually a good idea, to avoid handling some special cases
			// the total complexity remains about small+2e5 for that subtask
			return (int)all.size();
		}
	}
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:34:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   if(i==a.size()+62){ // +62 is actually a good idea, to avoid handling some special cases
      |      ~^~~~~~~~~~~~~

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