Submission #548070

#	Time	Username	Problem	Language	Result	Execution time	Memory
548070		aryan12	Kamenčići (COCI21_kamencici)	C++17	0 / 70	1 ms	340 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

int n, k;
string s;
const int N = 352;
int dp[N][N][2];

void Recur(int l, int r)
{
	if(dp[l][r][0] != -1)
	{
		return;
	}
	int movesPlayed = (n - 1 - r) + l;
	int curMove = movesPlayed % 2;

	if(l == r)
	{
		dp[l][r][1 - curMove] = 0;
		dp[l][r][curMove] = (s[l] == 'C') ? 1 : 0;
		return;
	}

	Recur(l, r - 1);
	Recur(l + 1, r);
	if(dp[l + 1][r][curMove] + (s[l] == 'C') < dp[l][r - 1][curMove] + (s[r] == 'C'))
	{
		dp[l][r][curMove] = dp[l + 1][r][curMove];
		dp[l][r][1 - curMove] = dp[l + 1][r][1 - curMove];
		if(s[l] == 'C')
		{
			dp[l][r][curMove]++;
		}
	}
	else
	{
		dp[l][r][curMove] = dp[l][r - 1][curMove];
		dp[l][r][1 - curMove] = dp[l][r - 1][1 - curMove];
		if(s[r] == 'C')
		{
			dp[l][r][curMove]++;
		}
	}
}

void Solve() 
{
	cin >> n >> k >> s;
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			dp[i][j][0] = -1;
			dp[i][j][1] = -1;
		}
	}
	Recur(0, n - 1);
	// for(int i = 0; i < n; i++)
	// {
	// 	for(int j = i; j < n; j++)
	// 	{
	// 		cout << "i = " << i << ", j = " << j << ": ";
	// 		cout << dp[i][j][0] << " " << dp[i][j][1] << "\n";
	// 	}
	// }
	int initial0 = dp[0][n - 1][0], initial1 = dp[0][n - 1][1];
	for(int i = 0; i < n; i++)
	{
		for(int j = i + 1; j < n; j++)
		{
			if(initial1 - dp[i][j][1] == k && initial0 - dp[i][j][0] < k)
			{
				cout << "DA\n";
				return;
			}
		}
	}
	cout << "NE\n";
}

int32_t main() 
{
	auto begin = std::chrono::high_resolution_clock::now();
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;
	//cin >> t;
	for(int i = 1; i <= t; i++) 
	{
		//cout << "Case #" << i << ": ";
		Solve();
	}
	auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
	return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 40