Submission #143790

#	Time	Username	Problem	Language	Result	Execution time	Memory
143790		jwvg0425	Split the Attractions (IOI19_split)	C++17	40 / 100	159 ms	14912 KiB

split

#include "split.h"
#include <stdio.h>
#include <vector>
#include <queue>
#include <algorithm>
#include <iostream>
#include <string>
#include <bitset>
#include <map>
#include <set>
#include <tuple>
#include <string.h>
#include <math.h>
#include <random>
#include <functional>
#include <assert.h>
#include <math.h>
#define all(x) (x).begin(), (x).end()
#define xx first
#define yy second

using namespace std;

using i64 = long long int;
using ii = pair<int, int>;
using ii64 = pair<i64, i64>;

vector<int> edge[100005];
int sub[100005];
int parent[100005];
int check[100005];

void dfs(int root)
{
    sub[root] = 1;
    for (auto&e : edge[root])
    {
        if (e == parent[root])
            continue;

        parent[e] = root;
        dfs(e);
        sub[root] += sub[e];
    }
}

void mark(int root, vector<int>& num, int& a, int& b)
{
    for (auto& e : edge[root])
    {
        if (e == parent[root])
            continue;

        if (check[e] == 0)
            check[e] = check[root];
    }

    if (check[root] == 1 && a > 0)
    {
        num[root] = 1;
        a--;
    }

    if (check[root] == 2 && b > 0)
    {
        num[root] = 2;
        b--;
    }

    for (auto& e : edge[root])
    {
        if (e == parent[root])
            continue;

        mark(e, num, a, b);
    }
}

void solve(vector<int>& num, int now, int k, int& count)
{
    if (count == 0)
        return;

    num[now] = k;
    count--;

    for (auto& e : edge[now])
    {
        if (num[e] != -1)
            continue;

        solve(num, e, k, count);
    }
}

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q)
{
    memset(parent, -1, sizeof(parent));
    for (int i = 0; i < p.size(); i++)
    {
        edge[p[i]].push_back(q[i]);
        edge[q[i]].push_back(p[i]);
    }

    if (p.size() == n - 1)
    {
        vector<int> num(n, 0);

        dfs(0);

        for (int i = 1; i < n; i++)
        {
            int ai = sub[i];
            int bi = n - sub[i];

            if (min(ai, bi) < min(a, b) || max(ai, bi) < max(a, b))
                continue;

            if (ai >= a && bi >= b)
            {
                check[i] = 1;
                check[0] = 2;
            }
            else
            {
                check[0] = 1;
                check[i] = 2;
            }

            mark(0, num, a, b);

            for (int j = 0; j < n; j++)
            {
                if (num[j] == 0)
                    num[j] = 3;
            }

            break;
        }

        return num;
    }
    else
    {
        vector<int> num(n, -1);
        solve(num, 0, 1, a);

        for (int i = 0; i < n; i++)
        {
            if (num[i] != -1)
                continue;

            int deg = 0;

            for (auto& e : edge[i])
            {
                if (num[e] == -1)
                    deg++;
            }

            if (deg == 2)
                continue;

            solve(num, i, 2, b);
        }

        for (int i = 0; i < n; i++)
        {
            if (num[i] == -1)
                num[i] = 3;
        }

        return num;
    }
}

Compilation message (stderr)

split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:99:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < p.size(); i++)
                     ~~^~~~~~~~~~
split.cpp:105:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (p.size() == n - 1)
         ~~~~~~~~~^~~~~~~~

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