Submission #124247

#	Time	Username	Problem	Language	Result	Execution time	Memory
124247		tutis	Mountains (IOI17_mountains)	C++17	70 / 100	1096 ms	219372 KiB

mountains

#pragma GCC optimize ("O3")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
bitset<2000>ok[2000];
unordered_map<bitset<2000>, int>M;
int dp(bitset<2000> x)
{
	int i = x._Find_first();
	if (i >= 2000)
		return 0;
	int &ans = M[x];
	if (ans != 0)
		return ans;
	x[i] = false;
	ans = max(1 + dp(x & ok[i]), dp(x));
	return ans;
}
int maximum_deevs(vector<int> y)
{
	bitset<2000>deevs;
	for (ll i = 0; i < (ll)y.size(); i++)
	{
		ll k = i + 1;
		for (ll j = i + 1; j < (ll)y.size(); j++)
		{
			if ((y[j] - y[i]) * (k - i) >= (y[k] - y[i]) * (j - i))
				k = j;
			if (j != k)
			{
				ok[i][j] = true;
			}
			else
				ok[i][j] = false;
		}
		deevs[i] = true;
	}
	return dp(deevs);
}/*
int main()
{
	cout << maximum_deevs({ 6, 1, 5, 2, 3, 1}) << endl;//3
	cout << maximum_deevs({ 0, 1, 2}) << endl;//1
}/**/

Compilation message (stderr)

mountains.cpp:45:2: warning: "/*" within comment [-Wcomment]
 }/**/

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 0 / 30