Submission #910023

#	Time	Username	Problem	Language	Result	Execution time	Memory
910023		VMaksimoski008	Valley (BOI19_valley)	C++14	0 / 100	61 ms	12880 KiB

valley

#include <bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

int n, s, e, q, timer = 0;
vector<vector<pii> > graph;
vector<int> stores;
vector<int> in, out;

void dfs(int u, int p) {
    in[u] = timer++;

    for(auto &[v, w] : graph[u]) {
        if(v == p) continue;
        dfs(v, u);
    }

    out[u] = timer;
}

bool anc(int u, int v) {
    return (in[u] <= in[v] && out[u] <= out[v]);
}

int32_t main() {
    setIO();

    cin >> n >> s >> q >> e;
    graph.resize(n+1);
    stores.resize(s);
    in.resize(n+1);
    out.resize(n+1);
    vector<pii> edges(n+1);

    for(int i=0; i<n-1; i++) {
        int a, b, w;
        cin >> a >> b >> w;
        graph[a].push_back({ b, w });
        graph[b].push_back({ a, w });
        edges[i+1] = { a, b };
    }

    for(int &x : stores) cin >> x;

    dfs(1, 0);

    while(q--) {
        int edge, city;
        cin >> edge >> city;

        int A = edges[edge].first;
        int B = edges[edge].second;

        if(in[A] < in[B]) swap(A, B);

        if(anc(A, city) == anc(A, e)) {
            cout << "escaped\n";
            continue;
        }

        cout << 0 << '\n';
    }

    return 0;
}

Compilation message (stderr)

valley.cpp: In function 'void dfs(int, int)':
valley.cpp:38:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   38 |     for(auto &[v, w] : graph[u]) {
      |               ^

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