Submission #872371

#	Time	Username	Problem	Language	Result	Execution time	Memory
872371		xjonwang	Burza (COCI16_burza)	C++17	0 / 160	154 ms	29776 KiB

burza

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

#define ll long long
#define ld long double
#define ar array

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;

template <typename T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define vt vector
#define pb push_back
#define all(c) (c).begin(), (c).end()
#define sz(x) (int)(x).size()
#define pll pair<ll, ll>
#define pii pair<int, int>
#define f first
#define s second

#define F_OR(i, a, b, s) for (int i=(a); (s)>0?i<(b):i>(b); i+=(s))
#define F_OR1(e) F_OR(i, 0, e, 1)
#define F_OR2(i, e) F_OR(i, 0, e, 1)
#define F_OR3(i, b, e) F_OR(i, b, e, 1)
#define F_OR4(i, b, e, s) F_OR(i, b, e, s)
#define GET5(a, b, c, d, e, ...) e
#define F_ORC(...) GET5(__VA_ARGS__, F_OR4, F_OR3, F_OR2, F_OR1)
#define FOR(...) F_ORC(__VA_ARGS__)(__VA_ARGS__)
#define EACH(x, a) for (auto& x: a)

template<class T> bool umin(T& a, const T& b) {
	return b<a?a=b, 1:0;
}
template<class T> bool umax(T& a, const T& b) { 
	return a<b?a=b, 1:0;
} 

ll FIRSTTRUE(function<bool(ll)> f, ll lb, ll rb) {
	while(lb<rb) {
		ll mb=(lb+rb)/2;
		f(mb)?rb=mb:lb=mb+1; 
	} 
	return lb;
}
ll LASTTRUE(function<bool(ll)> f, ll lb, ll rb) {
	while(lb<rb) {
		ll mb=(lb+rb+1)/2;
		f(mb)?lb=mb:rb=mb-1; 
	} 
	return lb;
}

template<class A> void read(vt<A>& v);
template<class A, size_t S> void read(ar<A, S>& a);
template<class A, class B> void read(pair<A, B>& x);
template<class T> void read(T& x) {
	cin >> x;
}
void read(double& d) {
	string t;
	read(t);
	d=stod(t);
}
void read(long double& d) {
	string t;
	read(t);
	d=stold(t);
}
template<class H, class... T> void read(H& h, T&... t) {
	read(h);
	read(t...);
}
template<class A> void read(vt<A>& x) {
	EACH(a, x)
		read(a);
}
template<class A, size_t S> void read(array<A, S>& x) {
	EACH(a, x)
		read(a);
}
template<class A, class B> void read(pair<A, B>& x) {
	cin >> x.first >> x.second;
}


string to_string(char c) {
	return string(1, c);
}
string to_string(bool b) {
	return b?"true":"false";
}
string to_string(const char* s) {
	return string(s);
}
string to_string(string s) {
	return s;
}
string to_string(vt<bool> v) {
	string res;
	FOR(sz(v))
		res+=char('0'+v[i]);
	return res;
}

template<size_t S> string to_string(bitset<S> b) {
	string res;
	FOR(S)
		res+=char('0'+b[i]);
	return res;
}
template<class T> string to_string(T v) {
    bool f=1;
    string res;
    EACH(x, v) {
		if(!f)
			res+=' ';
		f=0;
		res+=to_string(x);
	}
    return res;
}
template<class A, class B> string to_string(pair<A, B>& x) {
	return to_string(x.first) + ' ' + to_string(x.second);
}

template<class A> void write(A x) {
	cout << to_string(x);
}
template<class H, class... T> void write(const H& h, const T&... t) { 
	write(h);
	write(t...);
}
void print() {
	write("\n");
}
template<class H, class... T> void print(const H& h, const T&... t) { 
	write(h);
	if(sizeof...(t))
		write(' ');
	print(t...);
}

vt<vt<int>> adj, hi;
vt<vt<bool>> child;
vt<int> height, children;
int n, k;

pair<int, vt<int>> dfs(int v, int p) {
	height[v]=p!=-1 ? height[p]+1 : 0;
	vt<int> ch; ch.pb(v);
	int c=(height[v]==k);
	EACH(u, adj[v]) {
		if (u==p) continue;
		pair<int, vt<int>> d=dfs(u, v);
		c+=d.first;
		EACH(x, d.second) child[v][x]=1, ch.pb(x);
	}
	children[v]=c;
	if (height[v]>0 && height[v]<=k) hi[height[v]-1].pb(v);
	return {c, ch};
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int a, b; read(n, k);
	if (k>20) {
		print("DA");
		return 0;
	}
	k=min(k, 20);
	adj.resize(n), height.resize(n), children.resize(n), child.assign(n, vt<bool>(n, 0)), hi.resize(k);
	FOR(n-1) {
		read(a, b); a--, b--;
		adj[a].pb(b), adj[b].pb(a);
	}
	int e=dfs(0, -1).first;
	vt<pair<int, vt<bool>>> dp(1<<k, {0, vt<bool>(n, 1)});
	FOR(i, 1, 1<<k) {
		int m=0, idx1, idx2;
		FOR(j, k) {
			if (i & (1<<j)) {
				EACH(v, hi[j]) {
					if (dp[i^(1<<j)].second[v]) {
						if (umax(m, dp[i^(1<<j)].first+children[v])) {
							idx1=j, idx2=v;
						}
					}
				}
			}
		}
		if (m==e) {
			print("DA");
			return 0;
		}
		dp[i]={m, dp[1^(1<<idx1)].second};
		FOR(j, n) {
			if (child[idx2][j] || child[j][idx2]) dp[i].second[j]=0;
		}
	}
	assert(false);
	print("NE");
}

Compilation message (stderr)

burza.cpp: In function 'int main()':
burza.cpp:200:18: warning: 'idx2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  200 |    if (child[idx2][j] || child[j][idx2]) dp[i].second[j]=0;
      |                  ^
burza.cpp:198:20: warning: 'idx1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  198 |   dp[i]={m, dp[1^(1<<idx1)].second};
      |                  ~~^~~~~~~

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