Submission #861255

#	Time	Username	Problem	Language	Result	Execution time	Memory
861255		qwusha	Senior Postmen (BOI14_postmen)	C++17	55 / 100	548 ms	109532 KiB

postmen

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma gcc optimize("Ofast")
using namespace std;
typedef long long ll;
#define fi first
#define se second
typedef long double ld;
const ll inf = 1e9;
const ld eps = 1e-8;
vector<multiset<int>> g;
vector<vector<int>> ans;
vector<bool> used;
vector<int> cur;
set<int> stcur;
vector<int> res;

void dfs(int v) {
    if (stcur.find(v) != stcur.end()) {
        res.clear();
        while(cur.back() != v) {
            stcur.erase(cur.back());
            res.push_back(cur.back());
            cur.pop_back();
        }
        stcur.erase(cur.back());
        res.push_back(cur.back());
        cur.pop_back();
        ans.push_back(res);
    }
    if (v == 4) {
        int x = 1;
    }
    while (!g[v].empty()) {
        cur.push_back(v);
        stcur.insert(v);
        auto t = g[v].begin();
        int u = *t;
        g[v].erase(t);
        g[u].erase(g[u].find(v));
        dfs(u);
    }
}



signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n, m;
    cin >> n >> m;
    used.resize(n);
    g.resize(n);
    for (int i = 0; i < m; i++) {
        int v, u;
        cin >> v >> u;
        g[v - 1].insert(u - 1);
        g[u - 1].insert(v - 1);
    }
    dfs(0);
    for (auto s : ans) {
        for (auto el : s) {
            cout << el + 1 << ' ';
        }
        cout << '\n';
    }
}

Compilation message (stderr)

postmen.cpp:4: warning: ignoring '#pragma gcc optimize' [-Wunknown-pragmas]
    4 | #pragma gcc optimize("Ofast")
      | 
postmen.cpp: In function 'void dfs(int)':
postmen.cpp:33:13: warning: unused variable 'x' [-Wunused-variable]
   33 |         int x = 1;
      |             ^

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