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Submission #52615

# Submission time Handle Problem Language Result Execution time Memory
52615 2018-06-26T09:18:51 Z Alexa2001 Pipes (CEOI15_pipes) C++17
20 / 100
 1285 ms 14048 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int Nmax = 1e5 + 5;

int n, m, i, x, y;
int level[Nmax], low[Nmax];
vector<int> v[Nmax];

struct Forest
{
    int t[Nmax];

    void clear()
    {
        int i;
        for(i=1; i<=n; ++i) t[i] = i;
    }

    int boss(int x)
    {
        if(t[x] == x) return x;
        return t[x] = boss(t[x]);
    }

    void unite(int x, int y)
    {
        x = boss(x), y = boss(y);
        t[x] = y;
    }
} A, B;

void solve(int node, int dad = 0)
{
    level[node] = low[node] = level[dad] + 1;

    for(auto son : v[node])
    {
        if(son == dad) continue;
        if(level[son])
        {
            low[node] = min(low[node], level[son]);
            continue;
        }

        solve(son, node);
        low[node] = min(low[node], low[son]);

        if(low[son] == level[son])
            cout << node << ' ' << son << '\n';
    }
}

int main()
{
 //   freopen("input", "r", stdin);
  //  freopen("output", "w", stdout);
    cin.sync_with_stdio(false);

    cin >> n >> m;
    A.clear(); B.clear();

    while(m--)
    {
        cin >> x >> y;
        if(A.boss(x) != A.boss(y)) A.unite(x, y);
            else if(B.boss(x) != B.boss(y)) B.unite(x, y);
                else continue;
        v[x].push_back(y);
        v[y].push_back(x);
    }

    for(i=1; i<=n; ++i)
        if(!level[i]) solve(i);

    return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2624 KB Output is correct
2 Incorrect 4 ms 2688 KB Wrong number of edges

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 3200 KB Output is correct
2 Incorrect 8 ms 2984 KB Wrong number of edges

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 105 ms 3040 KB Output is correct
2 Incorrect 100 ms 2908 KB Wrong number of edges

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 168 ms 3848 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 303 ms 5436 KB Output is correct
2 Correct 256 ms 4984 KB Output is correct

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 447 ms 10700 KB Output is correct
2 Incorrect 401 ms 7164 KB Wrong number of edges

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 662 ms 11876 KB Output is correct
2 Incorrect 633 ms 9092 KB Wrong number of edges

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 852 ms 13960 KB Output is correct
2 Incorrect 806 ms 9204 KB Wrong number of edges

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1077 ms 14048 KB Output is correct
2 Incorrect 978 ms 9088 KB Wrong number of edges

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1285 ms 13412 KB Output is correct
2 Correct 1167 ms 10728 KB Output is correct