Submission #536022

#	Time	Username	Problem	Language	Result	Execution time	Memory
536022		akhan42	Uzastopni (COCI15_uzastopni)	C++17	120 / 160	31 ms	3216 KiB

uzastopni

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

#define F first
#define S second
#define forn(i, n) for(int i = 0; i < n; ++i)
#define forbn(i, b, n) for(int i = b; i < n; ++i)
#define sz(v) (int)v.size()
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define min3(a, b, c) min(a, min(b, c))
#define lc v << 1
#define rc (v << 1) + 1

typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef long long ll;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

template <class T> inline void mineq(T &a, T b) { a = min(a, b); }
template <class T> inline void maxeq(T &a, T b) { a = max(a, b); }


const int MX = 10 * 1000 + 10;

vi gr[MX];
int jokes[MX];
bitset<100> gl_gr[100];
vi att;


void dfs2(int node) {
	att[node] = true;

	for(int nb = gl_gr[node]._Find_first(); nb < sz(gl_gr[node]); nb = gl_gr[node]._Find_next(nb)) {
		if(!att[nb])
			dfs2(nb);
	}
}


vii dfs(int node = 0) {
	vii edges;

	for(int nb: gr[node]) {
		vii links = dfs(nb);

		for(ii p: links) {
			if(jokes[node] < jokes[nb])
				edges.eb(p.F - 1, p.S);
			else if(jokes[node] > jokes[nb])
				edges.eb(p.S + 1, p.F);
		}
	}

	att.assign(100, false);
	forn(i, 100)
		gl_gr[i].reset();
	for(ii p: edges)
		gl_gr[p.F][p.S] = 1;

	dfs2(jokes[node]);

	vii links;
	vi left, right;
	forbn(l, 0, jokes[node] + 1) if(att[l]) left.pb(l);
	forbn(r, jokes[node], 100) if(att[r]) right.pb(r);

	for(int l: left)
		for(int r: right)
			links.eb(l, r);

	return links;
}



void solve() {
	int n;
	cin >> n;

	forn(i, n) {
		cin >> jokes[i];
		jokes[i]--;
	}

	forn(_, n - 1) {
		int a, b;
		cin >> a >> b;
		a--; b--;
		gr[a].pb(b);
	}

	vii links = dfs(0);

	cout << sz(links);
}


int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

//	freopen("triangles.in", "r", stdin);
//	freopen("triangles.out", "w", stdout);

	int t = 1;
//	cin >> t;
	while(t--) {
		solve();
	}
}

• Subtask 1: 120 / 160