Submission #733954

#	Time	Username	Problem	Language	Result	Execution time	Memory
733954		DAleksa	Senior Postmen (BOI14_postmen)	C++17	38 / 100	1086 ms	23872 KiB

postmen

#include <bits/stdc++.h>

using namespace std;

struct edge {
    int v;
    int id;
};

const int N = 5e5 + 10;
vector<edge> g[N];
int n, m;
vector<int> eulerian_cycle;
bool mark[N];
int cnt[N];
int id = 0;

void find_eulerian_cycle(int u) {
    for(edge v : g[u]) {
        if(mark[v.id]) continue;
        mark[v.id] = true;
        find_eulerian_cycle(v.v);
        eulerian_cycle.push_back(v.v);
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        g[u].push_back({v, id});
        g[v].push_back({u, id++});
    }
    find_eulerian_cycle(1);
    eulerian_cycle.push_back(1);
    vector<vector<int>> ans;
    stack<int> stk;
    stk.push(eulerian_cycle[0]);
    for(int i = 1; i <= n; i++) cnt[i] = 0;
    cnt[eulerian_cycle[0]]++;
    assert(eulerian_cycle.size() == m + 1);
    for(int i = 1; i < eulerian_cycle.size(); i++) {
        if(cnt[eulerian_cycle[i]] > 0) {
            ans.push_back({});
            ans[ans.size() - 1].push_back(eulerian_cycle[i]);
            while(stk.top() != eulerian_cycle[i]) {
                ans[ans.size() - 1].push_back(stk.top());
                cnt[stk.top()]--;
                stk.pop();
            }
        } else {
            assert(cnt[eulerian_cycle[i]] == 0);
            cnt[eulerian_cycle[i]]++;
            stk.push(eulerian_cycle[i]);
        }
    }
    for(int i = 0; i < ans.size(); i++) {
        for(int j = 0; j < ans[i].size(); j++) cout << ans[i][j] << " ";
        cout << "\n";
    }
    return 0;
}

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from postmen.cpp:1:
postmen.cpp: In function 'int main()':
postmen.cpp:44:34: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |     assert(eulerian_cycle.size() == m + 1);
      |            ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
postmen.cpp:45:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for(int i = 1; i < eulerian_cycle.size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~~~~~~~
postmen.cpp:60:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |     for(int i = 0; i < ans.size(); i++) {
      |                    ~~^~~~~~~~~~~~
postmen.cpp:61:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         for(int j = 0; j < ans[i].size(); j++) cout << ans[i][j] << " ";
      |                        ~~^~~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 0 / 17
• Subtask 3: 0 / 45