Submission #696999

#	Time	Username	Problem	Language	Result	Execution time	Memory
696999		Markomafko972	Burza (COCI16_burza)	C++14	0 / 160	146 ms	4788 KiB

burza

#include <bits/stdc++.h>
#define X first
#define Y second
#define pb push_back
#define pii pair<int, int>
typedef long long ll;
using namespace std;

const int MOD = 1e9 + 7;
const ll INF = 1e18;
const int OFF = (1 << 20);
const int MAXN = (1 << 20);

int n, k, a, b;
vector<int> v[405];
vector<int> e[30][30];
vector<int> br[30];
bool dp[2][MAXN];

void dfs(int x, int d, int p) {
	if (d > k) return;
	br[d].push_back(x);
	
	for (int i = 0; i < v[x].size(); i++) {
		if (v[x][i] != p) {
			e[d][(int)br[d].size()-1].push_back((int)br[d+1].size());
			dfs(v[x][i], d+1, x);
		}
	}
}

int main () {

	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	cin >> n >> k;
	if (k > 20) {
		cout << "DA";
		return 0;
	}
	for (int i = 0; i < n-1; i++) {
		cin >> a >> b;
		v[a].push_back(b);
		v[b].push_back(a);
	}
	
	dfs(1, 0, 0);
	
	dp[0][0] = 1;
	for (int i = 0; i < k; i++) {
		for (int mask = 0; mask < (1 << ((int)br[i].size())); mask++) {
			if (dp[0][mask] == 0) continue;
			int nova = 0;
			for (int j = 0; j < br[i].size(); j++) {
				if ((mask&(1 << j)) == 0) continue;
				for (int slj = 0; slj < e[i][j].size(); slj++) nova |= (1 << e[i][j][slj]);
			}
			
			for (int j = 0; j < br[i+1].size(); j++) {
				dp[1][(nova|(1 << j))] = 1;
			}
		}
		
		for (int mask = 0; mask < (1 << ((int)br[i+1].size())); mask++) {
			dp[0][mask] = dp[1][mask];
			dp[1][mask] = 0;
		}
	}
	
	if (dp[0][(1 << ((int)br[k].size()))-1] == 1) cout << "DA";
	else cout << "NE";

	return 0;
}

Compilation message (stderr)

burza.cpp: In function 'void dfs(int, int, int)':
burza.cpp:24:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |  for (int i = 0; i < v[x].size(); i++) {
      |                  ~~^~~~~~~~~~~~~
burza.cpp: In function 'int main()':
burza.cpp:55:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |    for (int j = 0; j < br[i].size(); j++) {
      |                    ~~^~~~~~~~~~~~~~
burza.cpp:57:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for (int slj = 0; slj < e[i][j].size(); slj++) nova |= (1 << e[i][j][slj]);
      |                       ~~~~^~~~~~~~~~~~~~~~
burza.cpp:60:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |    for (int j = 0; j < br[i+1].size(); j++) {
      |                    ~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 16
• Subtask 3: 0 / 16
• Subtask 4: 0 / 16
• Subtask 5: 0 / 16
• Subtask 6: 0 / 16
• Subtask 7: 0 / 16
• Subtask 8: 0 / 16
• Subtask 9: 0 / 16
• Subtask 10: 0 / 16