Submission #88743

#	Time	Username	Problem	Language	Result	Execution time	Memory
88743		popovicirobert	Senior Postmen (BOI14_postmen)	C++14	55 / 100	525 ms	51368 KiB

postmen

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
// 217
// 44

using namespace std;

const int MAXN = (int) 5e5;

vector < pair <int, int> > g[MAXN + 1];
bool vis[MAXN + 1];
vector <int> ord;

void dfs(int nod) {
    while(g[nod].size()) {
        auto it = g[nod].back();
        g[nod].pop_back();
        if(vis[it.second] == 0) {
            vis[it.second] = 1;
            dfs(it.first);
        }
    }
    ord.push_back(nod);
}

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, n, m;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin >> n >> m;
    for(i = 1; i <= m; i++) {
        int x, y;
        cin >> x >> y;
        g[x].push_back({y, i});
        g[y].push_back({x, i});
    }
    dfs(1);
    memset(vis, 0, sizeof(vis));
    stack <int> stk;
    for(i = 0; i < ord.size(); i++) {
        //cerr << ord[i] << "\n";
        if(vis[ord[i]] == 0) {
            vis[ord[i]] = 1;
            stk.push(ord[i]);
        }
        else {
            while(stk.top() != ord[i]) {
                cout << stk.top() << " ";
                vis[stk.top()] = 0;
                stk.pop();
            }
            cout << ord[i] << "\n";
        }
    }
    //cout << ans;
    //cin.close();
    //cout.close();
    return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i = 0; i < ord.size(); i++) {
                ~~^~~~~~~~~~~~

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