oj.uz

Submission #412796

# Submission time Handle Problem Language Result Execution time Memory
412796 2021-05-27T14:28:41 Z fvogel499 Senior Postmen (BOI14_postmen) C++14
55 / 100
 500 ms 68580 KB 
/*
File created on 05/27/2021 at 15:50:04.
Link to problem: https://oj.uz/problem/view/BOI14_postmen
Description: Hierholzer's algorithm for eulerian cycle + separation in "mini" cycles
Time complexity: O(N+M)
Space complexity: O(N+M)
Status: TLE
Copyright: Ⓒ 2021 Francois Vogel
*/

#include <iostream>
#include <cmath>
#include <vector>
#include <bitset>
#include <queue>
#include <stack>
#include <cstring>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <algorithm>

using namespace std;

#define pii pair<int, int>
#define pib pair<int, *obj>
#define f first
#define s second

#define pb push_back
#define ins insert

#define int ll
#define ll long long

int encode(int a, int b) { return (min(a, b)*1000000+max(a, b)); }

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

    int n, nbEdges;
    cin >> n >> nbEdges;

    vector<vector<int>> graph(n);
    for (int i = 0; i < nbEdges; i++) {
        int nodeA, nodeB;
        cin >> nodeA >> nodeB;
        nodeA--;
        nodeB--;
        graph[nodeA].pb(nodeB);
        graph[nodeB].pb(nodeA);
    }

    unordered_set<int> usedEdges;
    vector<int> circuit;
    vector<int> path;
    path.pb(0);
    while (!path.empty()) {
        while (!graph[path.back()].empty() and usedEdges.find(encode(path.back(), graph[path.back()].back())) != usedEdges.end()) graph[path.back()].pop_back();
        if (graph[path.back()].empty()) {
            circuit.pb(path.back());
            path.pop_back();
        }
        else {
            int nn = graph[path.back()].back();
            graph[path.back()].pop_back();
            usedEdges.insert(encode(path.back(), nn));
            path.pb(nn);
        }
    }

    bool as [n];
    memset(as, false, n);
    vector<int> st;
    for (int i : circuit) {
        if (as[i]) {
            while (st.back() != i) {
                as[st.back()] = false;
                cout << st.back()+1 << " ";
                st.pop_back();
            }
            st.pop_back();
            cout << i+1 << " " << endl;
        }
        as[i] = true;
        st.pb(i);
    }

    int d = 0;
    d++;
}

Subtask #1
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 4 ms 588 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 3 ms 716 KB Output is correct
7 Correct 10 ms 1740 KB Output is correct
8 Correct 2 ms 460 KB Output is correct
9 Correct 65 ms 9468 KB Output is correct
10 Correct 4 ms 588 KB Output is correct
11 Correct 3 ms 588 KB Output is correct
12 Correct 72 ms 9908 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 4 ms 588 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 3 ms 716 KB Output is correct
7 Correct 10 ms 1740 KB Output is correct
8 Correct 2 ms 460 KB Output is correct
9 Correct 64 ms 9564 KB Output is correct
10 Correct 7 ms 588 KB Output is correct
11 Correct 5 ms 588 KB Output is correct
12 Correct 77 ms 9928 KB Output is correct
13 Correct 76 ms 14232 KB Output is correct
14 Correct 117 ms 12068 KB Output is correct
15 Correct 129 ms 12104 KB Output is correct
16 Correct 88 ms 14304 KB Output is correct
17 Correct 143 ms 10640 KB Output is correct
18 Correct 111 ms 11772 KB Output is correct

Subtask #3
0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 5 ms 672 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 3 ms 716 KB Output is correct
7 Correct 10 ms 1724 KB Output is correct
8 Correct 2 ms 460 KB Output is correct
9 Correct 64 ms 9544 KB Output is correct
10 Correct 4 ms 588 KB Output is correct
11 Correct 5 ms 588 KB Output is correct
12 Correct 78 ms 9924 KB Output is correct
13 Correct 69 ms 14304 KB Output is correct
14 Correct 115 ms 12068 KB Output is correct
15 Correct 122 ms 12068 KB Output is correct
16 Correct 73 ms 14276 KB Output is correct
17 Correct 131 ms 10540 KB Output is correct
18 Correct 114 ms 11760 KB Output is correct
19 Execution timed out 531 ms 68580 KB Time limit exceeded
20 Halted 0 ms 0 KB -