Submission #496561

#	Time	Username	Problem	Language	Result	Execution time	Memory
496561		Nuraly_Serikbay	Valley (BOI19_valley)	C++14	0 / 100	3057 ms	8304 KiB

valley

#include <bits/stdc++.h>
  
#define endl "\n"
#define mp make_pair
#define pb push_back
#define F first
#define S second
#define sz size()
#define rep(i,k,n) for(int i = k ; i <= n ; ++i)
#define per(i,k,n) for(int i = k ; i >= n ; --i)
#define Zymraq() ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define all(x) x.begin(),x.end()
#define fr(x) freopen(x".in","r",stdin),freopen(x".out","w",stdout)
#define toqta return 0
#define PERMUTE next_permutation
#define no cout<<"No"<<endl;
#define yes cout<<"Yes"<<endl;
#define a() a + 1, a + n + 1  
 
  
using namespace std;
   
typedef long long ll;
typedef unsigned long long ull;
typedef string S;
typedef double ld;
typedef long double lld;
   
const int N = 1e6 + 17;
const int modd = 1e9 + 7;
const int INF = 1e9 - 19;
const int P = 37;
const ll NN = 1e7 + 17;
const ld eps = 1e-19;
const double pi = 3.141592653589793238462643383279 ;
   
 
bool sortbysec(const pair<int,int> &a, const pair<int,int> &b){
    return (a.second < b.second);
}
 
void pre (ll a) {
    cout << fixed << setprecision(a);
    return;
}
 
ll n, s, q, e; 
vector <ll> g[100010];
ll l, r;
vector <pair <ll, ll>> reb;
bool ok;
pair <ll, ll> block;

void dfs (ll v, ll pr) {
	if (v == r) ok = 1;
	for (auto to: g[v]) {
		if (pr == to || (block.F == v && block.S == to) || (block.S == v && block.F == to)) continue;
		dfs (to, v);
	}
	return;
}

void solve() {
	cin >> n >> s >> q >> e;
	for (int i = 1; i < n; ++ i) {
		ll x, y, d;
		cin >> x >> y >> d;
		g[x].pb (y);
		g[y].pb (x);
		reb.pb (mp(x, y));		
	}	
	for (int i = 1; i <= s; ++ i) {
		ll x;
		cin >> x;
	}
	while (q --) {
		cin >> l >> r;
		ok = 0;		
		dfs (e, -1);	
		block = reb[l - 1];
		if (ok) cout << "escape\n";
		else cout << 0 << '\n';
	}
	return;
}
 
int main() {
	Zymraq ();	
	solve();
	return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 27
• Subtask 3: 0 / 23
• Subtask 4: 0 / 41