oj.uz

답안 #994386

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
994386 2024-06-07T14:18:16 Z gmroh06 우호 조약 체결 (JOI14_friends) C++14
100 / 100
 79 ms 11932 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

inline void fastio() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
}

ll n, m, ans;
ll parent[101010], cnt[101010];
bool vst[101010];
vector<ll> gr[101010];
queue<ll> q;

ll Find(ll x) {
    if (x == parent[x]) {
        return x;
    } else {
        return parent[x] = Find(parent[x]);
    }
}

void Union(ll x, ll y) {
    parent[Find(y)] = Find(x);
}

int main() {
    fastio();

    cin >> n >> m;

    for (ll i = 0, a, b; i < m; i++) {
        cin >> a >> b;

        gr[a].emplace_back(b);
    }

    for (ll i = 1; i <= n; i++) {
        parent[i] = i;
    }

    for (ll i = 1; i <= n; i++) {
        if (vst[i] or gr[i].size() < 2) continue;

        vector<ll> p;
        q.emplace(i);

        while (!q.empty()) {
            ll loc = q.front();
            q.pop();

            if (vst[loc]) continue;

            vst[loc] = true;

            for (auto& x : gr[loc]) {
                p.emplace_back(x);
                q.emplace(x);
            }
        }

        for (ll j = 0; j < p.size() - 1; j++) {
            Union(p[j], p[j + 1]);
        }

        vst[i] = false;
    }

    for (ll i = 1; i <= n; i++) {
        cnt[Find(i)]++;
    }

    for (ll i = 1; i <= n; i++) {
        ans += cnt[i] * (cnt[i] - 1);
    }

    for (ll i = 1; i <= n; i++) {
        for (auto& x : gr[i]) {
            ans += Find(x) != Find(i);
        }
    }

    cout << ans;

    return 0;
}

Compilation message

friends.cpp: In function 'int main()':
friends.cpp:65:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for (ll j = 0; j < p.size() - 1; j++) {
      |                        ~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2652 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2908 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 1 ms 2908 KB Output is correct
12 Correct 1 ms 2648 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2908 KB Output is correct
2 Correct 1 ms 2908 KB Output is correct
3 Correct 5 ms 3620 KB Output is correct
4 Correct 21 ms 8936 KB Output is correct
5 Correct 15 ms 6996 KB Output is correct
6 Correct 31 ms 10388 KB Output is correct
7 Correct 1 ms 2904 KB Output is correct
8 Correct 2 ms 3164 KB Output is correct
9 Correct 5 ms 3832 KB Output is correct
10 Correct 11 ms 4824 KB Output is correct
11 Correct 27 ms 10620 KB Output is correct
12 Correct 4 ms 3420 KB Output is correct
13 Correct 2 ms 2908 KB Output is correct
14 Correct 2 ms 3160 KB Output is correct
15 Correct 2 ms 3164 KB Output is correct
16 Correct 5 ms 3912 KB Output is correct
17 Correct 30 ms 10244 KB Output is correct
18 Correct 2 ms 2908 KB Output is correct
19 Correct 1 ms 3164 KB Output is correct
20 Correct 29 ms 10604 KB Output is correct
21 Correct 2 ms 2904 KB Output is correct
22 Correct 2 ms 2908 KB Output is correct
23 Correct 2 ms 3108 KB Output is correct
24 Correct 2 ms 2908 KB Output is correct
25 Correct 1 ms 2908 KB Output is correct
26 Correct 2 ms 2908 KB Output is correct
27 Correct 1 ms 2908 KB Output is correct
28 Correct 2 ms 2908 KB Output is correct

Subtask #3
65.0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 7900 KB Output is correct
2 Correct 42 ms 9424 KB Output is correct
3 Correct 41 ms 11720 KB Output is correct
4 Correct 25 ms 7684 KB Output is correct
5 Correct 14 ms 6624 KB Output is correct
6 Correct 37 ms 11088 KB Output is correct
7 Correct 38 ms 10404 KB Output is correct
8 Correct 41 ms 10320 KB Output is correct
9 Correct 33 ms 8020 KB Output is correct
10 Correct 33 ms 9132 KB Output is correct
11 Correct 79 ms 11792 KB Output is correct
12 Correct 71 ms 11464 KB Output is correct
13 Correct 34 ms 8528 KB Output is correct
14 Correct 31 ms 10540 KB Output is correct
15 Correct 12 ms 6236 KB Output is correct
16 Correct 4 ms 4440 KB Output is correct
17 Correct 1 ms 4188 KB Output is correct
18 Correct 44 ms 11544 KB Output is correct
19 Correct 47 ms 11504 KB Output is correct
20 Correct 26 ms 7344 KB Output is correct
21 Correct 15 ms 6200 KB Output is correct
22 Correct 2 ms 4444 KB Output is correct
23 Correct 15 ms 6612 KB Output is correct
24 Correct 30 ms 7652 KB Output is correct
25 Correct 20 ms 8452 KB Output is correct
26 Correct 22 ms 9092 KB Output is correct
27 Correct 42 ms 11932 KB Output is correct
28 Correct 24 ms 8168 KB Output is correct
29 Correct 24 ms 8020 KB Output is correct
30 Correct 51 ms 11768 KB Output is correct
31 Correct 24 ms 7748 KB Output is correct
32 Correct 18 ms 8540 KB Output is correct
33 Correct 18 ms 8692 KB Output is correct
34 Correct 27 ms 7764 KB Output is correct
35 Correct 17 ms 8536 KB Output is correct
36 Correct 31 ms 8912 KB Output is correct
37 Correct 28 ms 8020 KB Output is correct