제출 #547534

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
547534		LucaDantas	Packing Biscuits (IOI20_biscuits)	C++17	0 / 100	6 ms	340 KiB

biscuits

#include "biscuits.h"
#include <cassert>
#include <algorithm>
#include <cstdio>
#include <map>

long long x;
std::vector<long long> s;

std::map<long long, long long> mp;

long long g(long long n, int i) {
	if(n <= 0) return 0;
	if(n == 1) return 1;
	if(mp.count(n)) return mp[n];
	// retorno quantos caras menores que n são validos
	
	// opção 1: não usar o i-ésimo bit
	long long ans = g(1ll<<i, i-1);
	
	// opção 2: usar o i-ésimo bit, porém tenho que garantir que a soma do valor é suficiente
	// aka as: s[i] >= y*x ==(estou usando o i-ésimo bit)=> s[i]/x > (y + 1<<i) - 1 ==> s[i]/x + 1 - (1<<i) > y
	ans += g(std::min(n, s[i]/x + 1) - (1ll << i), i-1);

	mp[n] = ans;

	return ans;
}

long long count_tastiness(long long X, std::vector<long long> a) {
	mp.clear();
	x = X;
	s = a;
	while(s.size() < 61) s.push_back(0);
	for(int i = 1; i < s.size(); i++)
		s[i] = (1ll << i) * s[i] + s[i-1];
	return g(1ll<<61, 60);
}

컴파일 시 표준 에러 (stderr) 메시지

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:35:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |  for(int i = 1; i < s.size(); i++)
      |                 ~~^~~~~~~~~~

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