제출 #31516

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
31516		ngkan146	어르신 집배원 (BOI14_postmen)	C++11	55 / 100	891 ms	53788 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
struct edge{
    int v=0, id=0;
    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(){
    scanf("%d %d",&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));
    }

    dfs(1);

    for(int i=0;i<euler.size();i++){
        if (used[euler[i]]){
            while(st.top() != euler[i]){
                used[st.top()] = 0;
                printf("%d ",st.top());
                st.pop();
            };
            printf("%d\n",euler[i]);
        }
        else{
            st.push(euler[i]);
            used[euler[i]] = 1;
        }
    }
}

컴파일 시 표준 에러 (stderr) 메시지

postmen.cpp: In constructor 'edge::edge(int, int)':
postmen.cpp:4:17: warning: 'edge::id' will be initialized after [-Wreorder]
     int v=0, id=0;
                 ^
postmen.cpp:4:11: warning:   'int edge::v' [-Wreorder]
     int v=0, id=0;
           ^
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:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<euler.size();i++){
                 ~^~~~~~~~~~~~~
postmen.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~

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