Submission #31483

#	Time	Username	Problem	Language	Result	Execution time	Memory
31483		ngkan146	Senior Postmen (BOI14_postmen)	C++98	0 / 100	12 ms	12160 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
struct edge{
    int v, id;
    edge(int v=0,int id=0):id(id),v(v){}
};
int ctrl[500005];
vector <edge> G[500005];
bool visited[500005];
int n,m;
vector <int> euler;
void dfs(int u){
    for(;ctrl[u]<G[u].size();ctrl[u]++){
        int v = G[u][ctrl[u]].v;
        int id = G[u][ctrl[u]].id;
        if (visited[id]) continue;
        visited[id] = 1;
        dfs(v);
    }
    euler.push_back(u);
}
stack <int> st;
bool used[500005];
int main(){
    iostream::sync_with_stdio(0);
    cin >> n >> m;
    for(int i=1;i<=m;i++){
        int x,y;
        cin >> x >> y;
        G[x].push_back(edge(y,i));
        G[y].push_back(edge(x,i));
    }
    for(int i=1;i<=n;i++)
        dfs(i);
    cout << euler.size() << endl;
    for(int i=0;i<=euler.size()-n;i++){
        if (used[euler[i]]){
            int x;
            cout << euler[i] << ' ';
            do{
                used[st.top()] = 0;
                cout << st.top() << ' ';
                st.pop();
                x = st.top();
            }while(x != euler[i]);
            cout << endl;
        }
        else{
            st.push(euler[i]);
            used[euler[i]] = 1;
        }
    }
       // cout << euler[i] << ' ';
}

Compilation message (stderr)

postmen.cpp: In constructor 'edge::edge(int, int)':
postmen.cpp:4:12: warning: 'edge::id' will be initialized after [-Wreorder]
     int v, id;
            ^~
postmen.cpp:4:9: warning:   'int edge::v' [-Wreorder]
     int v, id;
         ^
postmen.cpp:5:5: warning:   when initialized here [-Wreorder]
     edge(int v=0,int id=0):id(id),v(v){}
     ^~~~
postmen.cpp: In function 'void dfs(int)':
postmen.cpp:13:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(;ctrl[u]<G[u].size();ctrl[u]++){
          ~~~~~~~^~~~~~~~~~~~
postmen.cpp: In function 'int main()':
postmen.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<=euler.size()-n;i++){
                 ~^~~~~~~~~~~~~~~~

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