oj.uz

Submission #851492

# Submission time Handle Problem Language Result Execution time Memory
851492 2023-09-20T01:25:59 Z Nhoksocqt1 Pipes (CEOI15_pipes) C++17
80 / 100
 829 ms 65536 KB 
#include<bits/stdc++.h>
using namespace std;

#define inf 0x3f3f3f3f
#define sz(x) int((x).size())
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> ii;

template<class X, class Y>
	inline bool maximize(X &x, const Y &y) {return (x < y ? x = y, 1 : 0);}
template<class X, class Y>
	inline bool minimize(X &x, const Y &y) {return (x > y ? x = y, 1 : 0);}

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Random(int l, int r) {
    return uniform_int_distribution<int>(l, r)(rng);
}

const int MAXN = 100005;

vector<int> adj[MAXN];
int lab[MAXN][2], numNode, numEdge;

int root(int it, int u) {
    return (lab[u][it] == u) ? u : (lab[u][it] = root(it, lab[u][it]));
}

void dfs(int u, int p = -1) {
    lab[u][0] = lab[u][1] = ++lab[0][0];

    bool edgep(1);
    for (int v : adj[u]) {
        if(v == p && edgep) {
            edgep = 0;
            continue;
        }

        if(!lab[v][1]) {
            dfs(v, u);
            lab[u][0] = min(lab[u][0], lab[v][0]);
            if(lab[v][0] >= lab[v][1])
                cout << u << ' ' << v << '\n';
        } else {
            lab[u][0] = min(lab[u][0], lab[v][1]);
        }
    }
}

void process() {
    cin >> numNode >> numEdge;
    for (int i = 1; i <= numNode; ++i)
        lab[i][0] = lab[i][1] = i;

    for (int i = 0; i < numEdge; ++i) {
        int u, v;
        cin >> u >> v;
        if(root(0, u) != root(0, v)) {
            lab[lab[u][0]][0] = lab[v][0];
            adj[u].push_back(v);
            adj[v].push_back(u);
        } else
            if(root(1, u) != root(1, v)) {
                lab[lab[u][1]][1] = lab[v][1];
                adj[u].push_back(v);
                adj[v].push_back(u);
            }
    }

    for (int i = 0; i <= numNode; ++i)
        lab[i][0] = lab[i][1] = 0;

    for (int i = 1; i <= numNode; ++i) {
        if(!lab[i][1])
            dfs(i);
    }
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    process();
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3416 KB Output is correct
2 Correct 2 ms 3420 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 3932 KB Output is correct
2 Correct 4 ms 3420 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 3668 KB Output is correct
2 Correct 63 ms 3572 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 111 ms 4376 KB Output is correct
2 Correct 128 ms 3844 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 198 ms 5972 KB Output is correct
2 Correct 167 ms 5460 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 261 ms 11012 KB Output is correct
2 Correct 211 ms 6908 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 390 ms 12208 KB Output is correct
2 Correct 390 ms 8796 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 512 ms 14236 KB Output is correct
2 Correct 478 ms 8368 KB Output is correct

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 621 ms 14240 KB Output is correct
2 Runtime error 608 ms 61472 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 829 ms 13512 KB Output is correct
2 Runtime error 752 ms 65536 KB Memory limit exceeded
3 Halted 0 ms 0 KB -