Submission #824066

#	Time	Username	Problem	Language	Result	Execution time	Memory
824066		TB_	Senior Postmen (BOI14_postmen)	C++17	100 / 100	413 ms	118080 KiB

postmen

#include <bits/stdc++.h>
using namespace std;

// #undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
// #pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
// #pragma GCC optimize ("unroll-loops")

// #pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
// #pragma GCC target("movbe")                                      // byte swap
// #pragma GCC target("aes,pclmul,rdrnd")                           // encryption
// #pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

// #include <bits/extc++.h>
// using namespace __gnu_pbds;
// template<class T>using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// template<class T>using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long
#define INF (ll)1e9+7
#define fo(i, n) for(ll i=0;i<((ll)n);i++)
#define deb(x) cout << #x << " = " << x << endl;
#define deb2(x, y) cout << #x << " = " << x << ", " << #y << " = " << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define LSOne(S) ((S) & (-S))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
inline int readint(){ int v = 0; char c; while((c = getchar()) != EOF && c != ' ' && c != '\n'){ v *= 10; v += c - '0'; } return v; }
inline int readintsigned() { int v = 0; int sign = 1; char c = getchar(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } return v * sign; }
inline string readstring() { string s; char c; while ((c = getchar()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } return s; }
template <class result_t=std::chrono::milliseconds,class clock_t=std::chrono::steady_clock,class duration_t = std::chrono::milliseconds>
auto since(std::chrono::time_point<clock_t, duration_t> const& start){return std::chrono::duration_cast<result_t>(clock_t::now() - start);}
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vpii> vvpii;
typedef vector<vpl> vvpl;


vvi adj2(500001), adj(500001);
int visiting[500001];
vvl ans;

int dfs(ll u, int last = -1){
    if(visiting[u]) {
        ans.pb({});
        return u;
    }
    for(int i = adj[u].size()-1; i>=0; i--){
        ll v = adj[u][i];
        adj[u].pop_back();
        if(!adj[v].size() || adj[v][adj[v].size()-1] < u) continue;

        visiting[u] = 1;
        int res = dfs(v, u);
        visiting[u] = 0;
        
        ans[ans.size()-1].pb(u);
        if(res != u) return res;
    }
    return -1;
}

int main() {
    // cout << fixed << setprecision(20);
    // auto start = std::chrono::steady_clock::now(); // since(start).count()
    cin.tie(0)->sync_with_stdio(0);


    int n, m, from, to;
    cin >> n >> m;
    fo(i, m){
        cin >> from >> to;
        adj2[--from].pb(--to);
        adj2[to].pb(from);
    }
    fo(i, n){
        for(auto v : adj2[i]){
            adj[v].pb(i);
        }
    }
    memset(visiting, 0, sizeof(visiting));

    fo(i, n) dfs(i);
    fo(i, ans.size()){
        fo(j, ans[i].size()) cout << ans[i][j]+1 << " ";
        cout << "\n";
    }

    exit(0);
}

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