Submission #534324

#	Time	Username	Problem	Language	Result	Execution time	Memory
534324		benson1029	Packing Biscuits (IOI20_biscuits)	C++14	100 / 100	39 ms	1320 KiB

biscuits

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

int k;
long long X;
vector<long long> pref;
long long ans[65];

int logb2(long long x) {
	int cnt = 0;
	while(x>1) {
		cnt++;
		x/=2;
	}
	return cnt;
}

long long findans(long long x) {
	if(x<=0) {
		return 0;
	}
	if(x==1) {
		return 1;
	}
	int LOG = logb2(x-1);
	int LOG1 = logb2(x);
	if(LOG != LOG1 && ans[LOG1]!=-1) {
		return ans[LOG1];
	}
	long long v = findans(1LL<<LOG) + findans(min(x, 1+pref[LOG]/X) - (1LL<<LOG));
	if(LOG != LOG1) {
		ans[LOG1] = v;
	}
	return v;
}

long long count_tastiness(long long x, std::vector<long long> a) {
	k = a.size(); X = x;
	pref.resize(61); a.resize(61);
	for(int i=0; i<=61; i++) ans[i] = -1;
	for(int i=k; i<61; i++) {
		a[i] = 0;
	}
	for(int i=0; i<61; i++) {
		pref[i] = (1LL<<i) * a[i];
		if(i) pref[i] += pref[i-1];
	}
	return findans(1LL<<61);
}

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