제출 #1119691

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1119691		sasde	어르신 집배원 (BOI14_postmen)	C++17	55 / 100	505 ms	66936 KiB

postmen

#include <bits/stdc++.h>
#define fi first
#define se second
using namespace std;
const int maxn = 5e5 + 5;
int n, m;
vector<pair<int, int>> g[maxn];
vector<int> path;
bool seen[maxn];
int vs[maxn];
void dfs(int node) {
	while (!g[node].empty()) {
	    int son = g[node].back().fi, idx = g[node].back().se;
//		auto [son, idx] = g[node].back();
		g[node].pop_back();
		if (seen[idx]) { continue; }
		seen[idx] = true;
		dfs(son);
	}
	path.push_back(node);
}

int main() {

	cin >> n >> m;


	for (int i = 0; i < m; i++) {
		int x, y;
		cin >> x >> y;
		g[x].push_back({y, i});
		g[y].push_back({x, i});

	}

    dfs(1);
    // cout<<"2 3 4 5 8 10 9"<<'\n'<<"7 8 4"<<'\n'<<"1 5 7 6 3";
    // for (int x : path) cout << x << " ";
    // cout << endl;
    stack<int> st;
    for (int i = 0; i < path.size(); i++) {
        if (vs[path[i]]) {
            while(!st.empty() && st.top() != path[i]) {
            	cout << st.top() << " ";
            	vs[st.top()] = 0;
                st.pop();
            } 
            cout << st.top() << " ";
            st.pop();
            cout << '\n';
        }
        st.push(path[i]);
        vs[path[i]] = 1;
    }
}

컴파일 시 표준 에러 (stderr) 메시지

postmen.cpp: In function 'int main()':
postmen.cpp:42:23: 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 < path.size(); i++) {
      |                     ~~^~~~~~~~~~~~~

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