Submission #583185

#	Time	Username	Problem	Language	Result	Execution time	Memory
583185		joelau	Packing Biscuits (IOI20_biscuits)	C++14	100 / 100	73 ms	1324 KiB

biscuits

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

long long X;
vector<long long> sum;
map<long long,long long> memo;

long long dp (long long x) {
	if (x < 0) return 0;
	if (x == 0) return 1;
	if (x == 1) return 1 + (sum[0] >= X);
	if (memo.find(x) != memo.end()) return memo[x];
	long long n = 0;
	while ((1ll<<(n+1)) <= x) n++;
	return memo[x] = dp((1ll<<n)-1) + dp(min(x,sum[n]/X)-(1ll<<n));
}

long long count_tastiness(long long x, vector<long long> a) {
	sum.clear(); memo.clear();
	while (a.size() <= 60) a.push_back(0);
	sum.push_back(a[0]);
	for (long long i = 1; i < a.size(); ++i) sum.push_back(sum.back() + a[i] * (1ll<<i));
	X = x;
	return dp(1ll<<60);
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:23:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for (long long i = 1; i < a.size(); ++i) sum.push_back(sum.back() + a[i] * (1ll<<i));
      |                        ~~^~~~~~~~~~

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