Submission #496429

#	Time	Username	Problem	Language	Result	Execution time	Memory
496429		Nuraly_Serikbay	Valley (BOI19_valley)	C++14	0 / 100	8 ms	716 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, dst[200];
vector <pair <ll, ll>> reb;
vector <ll> g[200];
ll dist[200][200];
bool sp[200];
ll broke[200][200];
bool ok;

void dfs (ll v, ll pr) {
	if (v == e) ok = 1;
	if (ok) return;
	for (auto to: g[v]) {
		if (!broke[v][to] && pr != to) {
			dst[to] = dst[v] + dist[v][to];
			dfs (to, v);
		}
	}
	return;
}

inline void Solution () {
	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);
		dist[x][y] = d;
		dist[y][x] = d;
		reb.pb (mp(x, y));
	}
	for (int i = 1; i <= s; ++ i) {
		ll x;
		cin >> x;
		sp[x] = 1;
	}
	while (q --) {
		ll l, r, ans = INF;
		cin >> l >> r;
		broke[reb[l - 1].F][reb[l - 1].S] = 1;
		broke[reb[l - 1].S][reb[l - 1].F] = 1;
 		ok = 0;
		for (int i = 1; i <= n; ++ i) dst[i] = 0;
		if (sp[r]) ans = 0;
		dfs (r, -1);
		broke[reb[l - 1].F][reb[l - 1].S] = 0;
		broke[reb[l - 1].S][reb[l - 1].F] = 0;
		if (ok) {
			cout << "escaped\n";
			continue;
		}
		for (int i = 1; i <= n; ++ i) {
			if (sp[i] && dst[i] != 0) ans = min (ans, dst[i]);
		}
		if (ans == INF) {
			cout << "oo\n";
			continue;
		}
		cout << ans << '\n';
	}
	return;
}    


int main () {
	Zymraq();
	Solution ();
	exit (0);
}/*

*/

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