Submission #1256780

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256780		rhm_gan	Split the Attractions (IOI19_split)	C++20	0 / 100	39 ms	11720 KiB

split

#include <bits/stdc++.h>
#include "split.h"
using namespace std;

const int N = 1e5 + 1;

vector<int> g[N];
vector<int> res;
bool vis[N];

int A, B, C;
vector<int> path;

void dfs(int u, int c) {
    int mx = N;
    if (c == 1) mx = A;
    if (c == 2) mx = B;
    if (c == 3) mx = C;
    if (path.size() == mx) {
        return;
    }
    vis[u] = true;
    path.push_back(u);
    for (auto v : g[u]) {
        if (!vis[v]) {
            dfs(v, c);
        }
    }
}

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
    if (a > c) swap(a, c);
    if (a > b) swap(a, b);
    if (b > c) swap(b, c);
    A = a; B = b; C = c;
    int m = p.size();
    res.resize(n, -1);
    for (int i = 0; i < m; i++) {
        g[p[i]].push_back(q[i]);
        g[q[i]].push_back(p[i]);
    }
    int u = 0;
    for (int i = 0; i < n; i++) {
        if (g[i].size() == 1) {
            u = i;
            break;
        }
    }
    dfs(u, 1);
    for (auto u : path) {
        res[u] = 1;
    }
    for (int i = 0; i < n; i++) {
        if (!vis[i]) {
            path.clear();
            dfs(i, 2);
            if (path.size() == b) {
                for (auto u : path) {
                    res[u] = 2;
                }
                for (int i = 0; i < n; i++) {
                    if (res[i] == -1) {
                        res[i] = 3;
                    }
                }
                return res;
            }
        }
    }
    return {};
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 24
• Subtask 5: 0 / 36