Submission #1028818

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028818		hmm789	Packing Biscuits (IOI20_biscuits)	C++14	100 / 100	21 ms	1376 KiB

biscuits

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

long long s[60], x;
unordered_map<long long, long long> memo;

long long dp(long long n) {
    if(n == 1) return 1;
    if(n <= 0) return 0;
    if(memo.count(n)) return memo[n];
    int bt = 63-__builtin_clzll(n-1);
    long long pw = 1LL<<bt;
    return memo[n] = dp(pw) + dp(min(n, 1+s[bt]/x)-pw);
}

long long count_tastiness(long long X, std::vector<long long> a) {
    x = X;
    while(a.size() < 60) a.push_back(0);
    s[0] = a[0];
    for(int i = 1; i < 60; i++) s[i] = s[i-1] + a[i]*(1LL<<i);
    memo.clear();
    return dp(s[59]+1);
}

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