Submission #441794

#	Time	Username	Problem	Language	Result	Execution time	Memory
441794		baluteshih	Keys (IOI21_keys)	C++17	37 / 100	3060 ms	33188 KiB

keys

#include <vector>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define X first
#define Y second
#define pb push_back
#define ALL(v) v.begin(), v.end()
#define SZ(a) ((int)a.size())

vector<int> G[300005];
vector<pii> road[300005];
int conn[300005], vis[300005];
vector<int> stk;

void dfs(int u, vector<int> &r) {
    if (!vis[r[u]])
        stk.pb(r[u]), vis[r[u]] = 1;
    conn[u] = 1;
    for (int i : G[u])
        if (!conn[i])
            dfs(i, r);
}

vector<int> find_reachable(vector<int> r, vector<int> u, vector<int> v, vector<int> c) {
    int n = SZ(r), m = SZ(u);
    vector<int> ans(n, 0);
    vector<int> arr(n, 0);
    for (int i = 0; i < m; ++i)
        road[c[i]].pb(pii(u[i], v[i]));
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j)
            vis[j] = conn[j] = 0, G[j].clear();
        dfs(i, r);
        while (!stk.empty()) {
            int clr = stk.back();
            stk.pop_back();
            for (pii e : road[clr]) {
                if (conn[e.X] && conn[e.Y])
                    continue;
                if (conn[e.X] || conn[e.Y]) {
                    if (!conn[e.X])
                        dfs(e.X, r);
                    if (!conn[e.Y])
                        dfs(e.Y, r);
                    continue;
                }
                G[e.X].pb(e.Y);
                G[e.Y].pb(e.X);
            }
        }
        for (int j = 0; j < n; ++j)
            arr[i] += conn[j];
    }
    int mi = *min_element(ALL(arr));
    for (int i = 0; i < n; ++i)
        if (arr[i] == mi)
            ans[i] = 1;
    return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33