Submission #547277

#	Time	Username	Problem	Language	Result	Execution time	Memory
547277		Jomnoi	Senior Postmen (BOI14_postmen)	C++17	0 / 100	120 ms	262144 KiB

postmen

#include <bits/stdc++.h>
#define DEBUG 0
using namespace std;
 
const int MAX_N = 5e5 + 10;
 
stack <pair <int, int>> graph[MAX_N];
vector <int> order;
bool used[MAX_N], is_print[MAX_N];
int visited[MAX_N];
 
void dfs(int u, int p) {
    while(!graph[u].empty()) {
        auto [v, i] = graph[u].top();
        graph[u].pop();

        if(v != p and used[i] == false) {
            used[i] = true;
            dfs(v, u);
        }
    }
    order.push_back(u);
}
 
int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= m; i++) {
        int u, v;
        cin >> u >> v;
        graph[u].emplace(v, i);
        graph[v].emplace(u, i);
    }

    dfs(1, -1);

    for(auto v : order) {
        cout << v << ' ';
    }
    cout << '\n';
    for(int i = 0; i < order.size(); i++) {
        if(visited[order[i]] != 0) {
            int j = i;
            while(j >= visited[order[i]]) {
                if(is_print[j] == false) {
                    cout << order[j] << ' ';
                    if(order[i] != order[j]) {
                        visited[order[j]] = 0;
                    }
                    is_print[j] = true;
                }
                j--;
            }
            cout << '\n';
        }
        visited[order[i]] = i + 1;
    }
    return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:42:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i = 0; i < order.size(); i++) {
      |                    ~~^~~~~~~~~~~~~~

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