Submission #816819

#	Time	Username	Problem	Language	Result	Execution time	Memory
816819		kevinsogo	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	52 ms	860 KiB

biscuits

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

ll count_tastiness(ll x, vector<ll> a) {
	a.resize(62);
	vector<ll> t = {0LL};
	for (int i = 0; i < a.size(); i++) t.push_back(t.back() + (a[i] << i));
	for (int i = 0; i < t.size(); i++) t[i] = min(t[i] / x, (1LL << i) - 1);
	vector<unordered_map<ll,ll>> posm(t.size());
	function<ll(ll,int)> poss = [&](ll s, int k) {
		if ((s = min(s, t[k])) < 0) return 0LL;
		if (k == 0) return 1LL;
		if (auto f = posm[k].find(s); f != posm[k].end()) return f->second;
		return posm[k][s] = poss(s, k - 1) + poss(s - (1LL << k - 1), k - 1);
	};
	return poss(t.back(), t.size() - 1);
}

Compilation message (stderr)

biscuits.cpp: In function 'll count_tastiness(ll, std::vector<long long int>)':
biscuits.cpp:9:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for (int i = 0; i < a.size(); i++) t.push_back(t.back() + (a[i] << i));
      |                  ~~^~~~~~~~~~
biscuits.cpp:10:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for (int i = 0; i < t.size(); i++) t[i] = min(t[i] / x, (1LL << i) - 1);
      |                  ~~^~~~~~~~~~
biscuits.cpp: In lambda function:
biscuits.cpp:16:59: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   16 |   return posm[k][s] = poss(s, k - 1) + poss(s - (1LL << k - 1), k - 1);
      |                                                         ~~^~~

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