Submission #1135005

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135005		steveonalex	Senior Postmen (BOI14_postmen)	C++20	100 / 100	205 ms	80660 KiB

postmen

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()

ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}

ll gcd(ll a, ll b){return __gcd(a, b);}
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ll mask){return __builtin_ctzll(mask);}
int logOf(ll mask){return __lg(mask);}

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

template <class T>
    void printArr(T& container, string separator = " ", string finish = "\n"){
        for(auto item: container) cout << item << separator;
        cout << finish;
    }


template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int N = 5e5 + 69;
int n, m;
vector<int> graph[N];
int xor_edge[N];
bool banned[N];

vector<int> euler_tour;

void go(int u){
    while(graph[u].size()){
        int e = graph[u].back(); graph[u].pop_back();
        if (banned[e]) continue;
        banned[e] = true;
        int v = xor_edge[e] ^ u;
        go(v);

        euler_tour.push_back(u);
    }
}

void solve(){
    cin >> n >> m;
    for(int i = 0; i < m; ++i){
        int u, v; cin >> u >> v;
        xor_edge[i] = u ^ v;

        graph[u].push_back(i);
        graph[v].push_back(i);
    }

    for(int i = 1; i <= n; ++i) if (graph[i].size()){
        euler_tour.push_back(i);
        go(i);
    }

    vector<bool> visited(n+1);
    vector<vector<int>> ans;
    vector<int> st;
    for(int i: euler_tour){
        if (!visited[i]) {
            visited[i] = true;
            st.push_back(i);
        }
        else{
            vector<int> cur = {i};
            while(st.back() != i){
                visited[st.back()] = 0;
                cur.push_back(st.back());
                st.pop_back();
            }
            ans.push_back(cur);
        }
    }
    for(auto i: ans){
        printArr(i);
    }
}

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    clock_t start = clock();

    solve();

    cerr << "Time elapsed: " << clock() - start << "ms!\n";
    return 0;
}

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