Submission #479878

#	Time	Username	Problem	Language	Result	Execution time	Memory
479878		SamAnd	Senior Postmen (BOI14_postmen)	C++17	100 / 100	387 ms	79492 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
const int N = 500005;

int n, m;
int z;
bool c[N];
int s[N];
pair<int, int> a[N];
vector<int> b[N];

int vn;
int v[N];
void dfs(int x)
{
    while (s[x] != -1)
    {
        int h = a[b[x][s[x]]].first;
        if (h == x)
            h = a[b[x][s[x]]].second;
        if (c[b[x][s[x]]])
        {
            --s[x];
            continue;
        }
        c[b[x][s[x]]] = true;
        --s[x];
        dfs(h);
    }
    v[vn++] = x;
}

int ka()
{
    int x = 0;
    while (1)
    {
        char t = getchar();
        if (t == ' ' || t == '\n')
            return x;
        x *= 10;
        x += (t - '0');
    }
}

char t[10];
void tp(int x)
{
    int tn = 0;
    while (x)
    {
        t[tn++] = (x % 10) + '0';
        x /= 10;
    }
    for (int i = tn - 1; i >= 0; --i)
        putchar(t[i]);
    putchar(' ');
}

int main()
{
    n = ka();
    m = ka();
    for (int i = 0; i < m; ++i)
    {
        int x, y;
        x = ka();
        y = ka();
        ++z;
        a[z] = m_p(x, y);
        b[x].push_back(z);
        b[y].push_back(z);
    }
    for (int i = 1; i <= n; ++i)
        s[i] = b[i].size() - 1;
    dfs(1);
    memset(c, false, sizeof c);
    vector<int> s;
    for (int i = 0; i < vn; ++i)
    {
        if (c[v[i]])
        {
            tp(v[i]);
            while (s.back() != v[i])
            {
                tp(s.back());
                c[s.back()] = false;
                s.pop_back();
            }
            putchar('\n');
        }
        else
        {
            s.push_back(v[i]);
            c[v[i]] = true;
        }
    }
    return 0;
}

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