Submission #1055551

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055551		Trent	Packing Biscuits (IOI20_biscuits)	C++17	0 / 100	1098 ms	1051184 KiB

biscuits

#include "biscuits.h"
#include "bits/stdc++.h"
using namespace std;
#define forR(i, x) for(int i = 0; i < (x); ++i)
#define REP(i, a, b) for(int i = (a); i < (b); ++i)
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef vector<ll> vll;

ll INF = 1e18;
// a - b*c >= 0 when a <= 1e18
ll gte0(ll a, ll b, ll c) {
	if(b > INF / c) return true;
	return a - b*c > 0;
}
long long count_tastiness(long long x, std::vector<long long> a) {
	a.insert(a.begin(), (ll) 0);
	int k = 60;
	while(a.size() < k) a.push_back(0);
	vll sm(k);

	sm[0] = a[0];
	REP(i, 1, k) sm[i] = sm[i-1] + (1LL << (i-1)) * a[i];

	vll vals = {sm[k-1]};
	for(int i = k - 1; i > 0; --i) {
		vll nex;
		for(ll j : vals) {
			j = min(j, sm[i]);
			nex.push_back(j);
			if(gte0(j, 1LL << (i-1), x) >= 0) nex.push_back(j - (1LL << (i-1)) * x);
		}
		vals.swap(nex);
	}
	return vals.size();
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:19:17: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   19 |  while(a.size() < k) a.push_back(0);
      |        ~~~~~~~~~^~~

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