Submission #1252614

#	Time	Username	Problem	Language	Result	Execution time	Memory
1252614		SamAnd	World Map (IOI25_worldmap)	C++20	72 / 100	71 ms	9540 KiB

worldmap

#include "worldmap.h"
#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 250;

int n;
vector<int> g[N];

bool c[N];
void dfs(int x, vector<int>& v)
{
    c[x] = true;
    v.push_back(x);
    for (int i = 0; i < g[x].size(); ++i)
    {
        int h = g[x][i];
        if (!c[h])
        {
            dfs(h, v);
            v.push_back(-x);
        }
    }
}

std::vector<std::vector<int> > create_map(int N, int M, std::vector<int> A, std::vector<int> B)
{
    n = N;
    for (int i = 0; i <= n + 1; ++i)
    {
        g[i].clear();
        c[i] = false;
    }
    for (int i = 0; i < M; ++i)
    {
        int x = A[i];
        int y = B[i];
        g[x].push_back(y);
        g[y].push_back(x);
    }

    vector<int> v;
    dfs(1, v);
    for (int x = 1; x <= n; ++x)
        assert(c[x]);
    vector<vector<int> > ans;
    for (int i = 0; i < sz(v); ++i)
    {
        int x = v[i];
        if (x > 0)
        {
            vector<int> t(2 * n, x);
            ans.push_back(t);
            for (int i = 0; i < g[x].size(); ++i)
                t[i * 2] = g[x][i];
            ans.push_back(t);
            t.assign(2 * n, x);
            ans.push_back(t);
        }
        else
        {
            x *= -1;
            vector<int> t(2 * n, x);
            ans.push_back(t);
        }
    }

    for (int i = 0; i < sz(ans); ++i)
        assert(sz(ans[i]) == sz(ans[0]));
    while (sz(ans) < sz(ans[0]))
    {
        ans.push_back(ans.back());
    }
    while (sz(ans[0]) < sz(ans))
    {
        for (int i = 0; i < sz(ans); ++i)
            ans[i].push_back(ans[i].back());
    }
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 7 / 7
• Subtask 4: 8 / 8
• Subtask 5: 14 / 14
• Subtask 6: 28 / 56