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Submission #706513

# Submission time Handle Problem Language Result Execution time Memory
706513 2023-03-06T20:37:46 Z tamyte Monthly railway pass (LMIO18_menesinis_bilietas) C++14
100 / 100
 385 ms 30988 KB 
#include <bits/stdc++.h>


using namespace std;

struct DSU {
    vector<int> e;
    DSU(int n) {
        e = vector<int>(n, -1);
    }
    int get(int x) {
        return e[x] < 0 ? x : e[x] = get(e[x]);
    }
    bool same(int x, int y) {
        return get(x) == get(y);
    }
    int size(int x) {
        return -e[get(x)];
    }
    bool unite(int x, int y) {
//        cout << x << " " << y << " -> ";
        x = get(x), y = get(y);
//        cout << x << " " << y << "\n";
        if (x == y) return false;
        if (e[x] > e[y]) swap(x, y);
        e[x] += e[y];
        e[y] = x;
//        cout << x << " " << y << "\n";
        return true;
    }

};

vector<int> adj[(int)5e5 + 1];


int main() {
    int n, m;
    cin >> n >> m;
    DSU dsu(n);
    if (!m) {
        cout << 0;
        return 0;
    }
    vector<pair<int, int>> bus;
    for (int i = 0; i < m; ++i) {
        int a, b;
        char c;
        cin >> a >> b >> c;
        --a; --b;
        if (c == 'T') {
//            cout << "a";
            dsu.unite(a, b);
        } else {
            bus.push_back({a, b});
        }
    }
//    for (auto u : dsu.e) {
//        cout << u << " ";
//    }
//    cout << "\n";
    bool free = true;
    for (auto u : bus) {
        int x = dsu.get(u.first);
        int y = dsu.get(u.second);
        if (x == y) continue;
        free = false;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    // cout << free << "\n";
    if (free) {
        bool connected = true;
        // cerr << "a";
        // cout << "a";
        for (int i = 0; i < n; ++i) {
            if (dsu.get(i) != dsu.get(0)) {
                connected = false;
                break;
            }
        } 
        if (connected) cout << n;
        else cout << 0;
        return 0;
    }
    // cerr << "a";
    int cnt = 0;
    for (int i = 0; i < n; ++i) {
        auto& curr = adj[i];
        if (curr.size()) {
            sort(curr.begin(), curr.end());
            auto it = unique(curr.begin(), curr.end());
            curr.erase(it, curr.end());
            int sum = (dsu.e[i] < 0 ? -dsu.e[i] : 1);
            for (auto& u : curr) {
                sum += -dsu.e[u];
            }
            cnt += (sum == n) * (dsu.e[i] < 0 ? -dsu.e[i] : 1);
        }
    }
    cout << cnt;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 308 ms 13140 KB Output is correct
2 Correct 6 ms 11988 KB Output is correct
3 Correct 7 ms 11984 KB Output is correct
4 Correct 7 ms 13780 KB Output is correct
5 Correct 7 ms 11988 KB Output is correct
6 Correct 109 ms 14352 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 13780 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 7 ms 11988 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 10 ms 12232 KB Output is correct
6 Correct 229 ms 19036 KB Output is correct
7 Correct 385 ms 30988 KB Output is correct
8 Correct 16 ms 12756 KB Output is correct
9 Correct 24 ms 12880 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 7 ms 11984 KB Output is correct
3 Correct 7 ms 11988 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 10 ms 12232 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 5 ms 11988 KB Output is correct
8 Correct 7 ms 12116 KB Output is correct
9 Correct 10 ms 12184 KB Output is correct
10 Correct 11 ms 12312 KB Output is correct
11 Correct 11 ms 12184 KB Output is correct
12 Correct 6 ms 11992 KB Output is correct
13 Correct 6 ms 12012 KB Output is correct
14 Correct 12 ms 12300 KB Output is correct
15 Correct 6 ms 11984 KB Output is correct
16 Correct 7 ms 12056 KB Output is correct
17 Correct 6 ms 11988 KB Output is correct
18 Correct 8 ms 12052 KB Output is correct
19 Correct 7 ms 12052 KB Output is correct
20 Correct 8 ms 12056 KB Output is correct

Subtask #4
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 5 ms 11988 KB Output is correct
3 Correct 7 ms 12116 KB Output is correct
4 Correct 10 ms 12184 KB Output is correct
5 Correct 11 ms 12312 KB Output is correct
6 Correct 11 ms 12184 KB Output is correct
7 Correct 6 ms 11992 KB Output is correct
8 Correct 6 ms 12012 KB Output is correct
9 Correct 12 ms 12300 KB Output is correct
10 Correct 6 ms 11984 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 6 ms 11988 KB Output is correct
13 Correct 8 ms 12052 KB Output is correct
14 Correct 7 ms 12052 KB Output is correct
15 Correct 8 ms 12056 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 7 ms 11984 KB Output is correct
18 Correct 7 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 10 ms 12232 KB Output is correct
21 Correct 7 ms 11988 KB Output is correct
22 Correct 16 ms 12756 KB Output is correct
23 Correct 24 ms 12880 KB Output is correct
24 Correct 109 ms 14352 KB Output is correct
25 Correct 23 ms 12880 KB Output is correct
26 Correct 236 ms 23304 KB Output is correct
27 Correct 89 ms 16592 KB Output is correct
28 Correct 118 ms 18132 KB Output is correct
29 Correct 69 ms 15556 KB Output is correct
30 Correct 123 ms 16872 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 5 ms 11988 KB Output is correct
3 Correct 7 ms 12116 KB Output is correct
4 Correct 10 ms 12184 KB Output is correct
5 Correct 11 ms 12312 KB Output is correct
6 Correct 11 ms 12184 KB Output is correct
7 Correct 6 ms 11992 KB Output is correct
8 Correct 6 ms 12012 KB Output is correct
9 Correct 12 ms 12300 KB Output is correct
10 Correct 6 ms 11984 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 6 ms 11988 KB Output is correct
13 Correct 8 ms 12052 KB Output is correct
14 Correct 7 ms 12052 KB Output is correct
15 Correct 8 ms 12056 KB Output is correct
16 Correct 23 ms 12880 KB Output is correct
17 Correct 236 ms 23304 KB Output is correct
18 Correct 89 ms 16592 KB Output is correct
19 Correct 118 ms 18132 KB Output is correct
20 Correct 69 ms 15556 KB Output is correct
21 Correct 123 ms 16872 KB Output is correct
22 Correct 308 ms 13140 KB Output is correct
23 Correct 6 ms 11988 KB Output is correct
24 Correct 7 ms 11984 KB Output is correct
25 Correct 7 ms 13780 KB Output is correct
26 Correct 7 ms 11988 KB Output is correct
27 Correct 6 ms 11988 KB Output is correct
28 Correct 10 ms 12232 KB Output is correct
29 Correct 7 ms 11988 KB Output is correct
30 Correct 229 ms 19036 KB Output is correct
31 Correct 385 ms 30988 KB Output is correct
32 Correct 16 ms 12756 KB Output is correct
33 Correct 24 ms 12880 KB Output is correct
34 Correct 109 ms 14352 KB Output is correct
35 Correct 49 ms 13708 KB Output is correct
36 Correct 292 ms 24964 KB Output is correct
37 Correct 132 ms 15776 KB Output is correct