Submission #547522

#	Time	Username	Problem	Language	Result	Execution time	Memory
547522		LucaDantas	Packing Biscuits (IOI20_biscuits)	C++17	77 / 100	157 ms	3668 KiB

biscuits

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

long long x_leq_10000(long long x, std::vector<long long> a) {
	while(a.size() < 60) a.push_back(0);

	for(int i = 0; i+1 < (int)a.size(); i++) {
		if(a[i] <= x) continue;
		if((a[i]&1)==(x&1)) {
			a[i+1] += (a[i] - x) >> 1;
			a[i] = x;
		} else {
			a[i+1] += (a[i] - x - 1) >> 1; 
			a[i] = x+1;
		}
	}

	long long dp[10010]{}, new_dp[10010]{};

	dp[0] = 1, dp[x] = 1;

	for(int i = (int)(a.size()) - 1; i >= 0; i--) {
		for(int qtd = 0; qtd <= x; qtd++)
			new_dp[qtd] = dp[(a[i] + qtd)/2] + (a[i]+qtd >= x ? dp[(a[i] + qtd - x) / 2] : 0);
		for(int qtd = 0; qtd <= x; qtd++)
			dp[qtd] = new_dp[qtd];
	}

	return dp[0];
}

long long count_tastiness(long long x, std::vector<long long> a) {
	if(x <= 10000) return x_leq_10000(x, a);
	std::vector<long long> val(200000);
	int pos = 1;

	while(a.size() < 60) a.push_back(0);
	for(int i = 1; i < (int)a.size(); i++)
		a[i] = (1ll << i) * a[i] + a[i-1];

	for(int i = 0; i < 60; i++) {
		long long pot = (1ll << i);
		int last = std::upper_bound(val.begin(), val.begin()+pos, a[i] / x - (1ll << i)) - val.begin();
		for(int j = 0; j < last; j++)
			val[pos++] = val[j]|pot;
	}

	return pos;
}

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