Submission #987784

#	Time	Username	Problem	Language	Result	Execution time	Memory
987784		876pol	Bridges (APIO19_bridges)	C++17	13 / 100	3072 ms	18364 KiB

bridges

#include <bits/stdc++.h>

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

using ll = long long;
using int128 = __int128_t;
using pll = pair<ll, ll>;
template <class T>
using vec = vector<T>;
template <class T>
using indexed_set =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define FOR(i, s, e) for (ll i = (ll)s; i < (ll)e; i++)
#define CFOR(i, s, e) for (ll i = (ll)s; i <= (ll)e; i++)
#define TRAV(e, a) for (const auto &e : a)
#define all(x) x.begin(), x.end()
#define dbg(x) cerr << "ln" << __LINE__ << ": " << #x << " = " << x << endl;

template <class T, class = decay_t<decltype(*begin(declval<T>()))>,
          class = enable_if_t<!is_same<T, string>::value>>
ostream &operator<<(ostream &out, const T &obj) {
    out << "[";
    for (auto it = obj.begin(); it != obj.end(); it++) {
        out << &", "[2 * (it == obj.begin())] << *it;
    }
    return out << "]";
}

template <class K, class V>
ostream &operator<<(ostream &out, const pair<K, V> &obj) {
    return out << "(" << obj.first << ", " << obj.second << ")";
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n, m;
    cin >> n >> m;
    vec<vec<pll>> graph(n + 1);
    vec<ll> w(m + 1);
    CFOR(i, 1, m) {
        ll a, b;
        cin >> a >> b >> w[i];
        graph[a].push_back({b, i});
        graph[b].push_back({a, i});
    }
    ll q;
    cin >> q;
    vec<vec<ll>> queries(q, vec<ll>(3));
    FOR(i, 0, q) {
        cin >> queries[i][0] >> queries[i][1] >> queries[i][2];
    }
    
    vec<bool> visited(n + 1);
    FOR(i, 0, q) {
        if (queries[i][0] == 1) {
            w[queries[i][1]] = queries[i][2];
        } else {
            fill(all(visited), 0ll);
            function<void(ll)> dfs = [&](ll curr) {
                visited[curr] = 1;
                TRAV(e, graph[curr]) {
                    if (visited[e.first] || queries[i][2] > w[e.second])
                        continue;
                    dfs(e.first);
                }
            };
            dfs(queries[i][1]);
            cout << accumulate(all(visited), 0ll) << "\n";
        }
    }
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27