Submission #1067119

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067119		n1k	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	51 ms	1116 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
	
using namespace std;
using ll = long long;
	
const int K = 61;

ll X;
vector<ll> sum(K);
map<ll, ll> mem;
	
ll fast(ll t){
	if(mem.count(t)) return mem[t];
	if(t==1) return 1;
	if(t<=0) return 0;
	ll msb = 63 - __builtin_clzll(t);
	if((1ll<<msb)==t) msb--;
	return mem[t]=fast(1ll<<msb) + fast(min(t, sum[msb]/X+1)-(1ll<<msb));
}
	
long long count_tastiness(long long x, std::vector<long long> a) {
	sum.assign(K+5, 0);
	mem.clear();
	X = x;
	for(int i=0; i<K; i++){
		if(i<a.size()) sum[i]+=(1ll<<i)*a[i];
		sum[i+1]+=sum[i];
	}
	return fast(1ll<<K);
}
	
/*
1
4 1
0 0 0 0
*/

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:27:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |   if(i<a.size()) sum[i]+=(1ll<<i)*a[i];
      |      ~^~~~~~~~~

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