Submission #1253467

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253467		vuviet	World Map (IOI25_worldmap)	C++20	100 / 100	28 ms	2892 KiB

worldmap

#include <bits/stdc++.h>

using namespace std;

const int N = 50;
typedef vector<int> vi;

vector<vi> world_map;      
vi adj[N], tree[N];     

int vis[N], par[N];
int sz[N], depth[N];
pair<int, int> pos[N];      

void DFS(int node, int prev, int d) 
{
    vis[node] = 1;
    depth[node] = d;
    sz[node] = 1;
    for (int v : adj[node]) 
    {
        if (v == prev || vis[v]) continue;
        par[v] = node;
        tree[node].push_back(v);
        tree[v].push_back(node);
        DFS(v, node, d + 1);
        sz[node] += sz[v];
    }
}

void Build(int node, int prev, int l, int r, int level) 
{
    for (int i = l; i <= r; ++i) {
        world_map[level * 2][i] = node;
    }
    for (int i = l; i <= r; ++i) 
        if ((i - l) % 2 == 1) 
        {
            world_map[level * 2 + 1][i] = node;
            if (level > 0)
                world_map[level * 2 - 1][i] = node;
        }
    pos[node] = {level * 2, l + 1};
    for (int child : tree[node]) 
    {
        if (child == prev) continue;
        ++l;
        Build(child, node, l, l + sz[child] * 2 - 2, level + 1);
        l += sz[child] * 2 - 1;
    }
}

vector<vi> create_map(int n, int m, vi a, vi b) 
{
    world_map.assign(n * 2 - 1, vi(n * 2 - 1, 0));
    for (int i = 1; i <= n; ++i) 
    {
        adj[i].clear();
        tree[i].clear();
        vis[i] = 0;
    }
    for (int i = 0; i < m; ++i) {
        adj[a[i]].push_back(b[i]);
        adj[b[i]].push_back(a[i]);
    }
    DFS(1, 0, 0);
    Build(1, 0, 0, 2 * n - 2, 0);
    for (int i = 1; i <= n; ++i) 
        for (int v : adj[i]) {
            if (depth[v] > depth[i] && par[v] != i) 
            {
                auto &[x, y] = pos[i];
                world_map[x][y] = v;
                y += 2;
            }
        }
    for (int i = 0; i < 2 * n - 1; ++i) 
        for (int j = 0; j < 2 * n - 1; ++j) 
            if (world_map[i][j] == 0) 
            {
                if (i > 0) world_map[i][j] = world_map[i - 1][j];
                else world_map[i][j] = world_map[i][j - 1];
            }
    return world_map;
}

• 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: 56 / 56