Submission #226331

#	Time	Username	Problem	Language	Result	Execution time	Memory
226331		AaronNaidu	Split the Attractions (IOI19_split)	C++14	0 / 100	8 ms	2816 KiB

split

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

vector<int> graph[100001];
int n, a, b, c, num;
bool visited[100001];
vector<int> toRet;
int parent[100001];
int subSize[100001];
int num1 = 0;
int num2 = 0;

int dfs(int node, int par) {
    visited[node] = true;
    parent[node] = par;
    int subsize = 1;
    for (auto i : graph[node])
    {
        if (!visited[i])
        {
            subsize += dfs(i, node);
        }
    }
    subSize[node] = subsize;
    return subsize;
}

void dfs1(int node) {
    num1++;
    if (num1 > a)
    {
        return;
    }
    toRet[node] = 1;
    for (auto i : graph[node])
    {
        if (i != parent[node])
        {
            if(num1 > a) {
                return;
            }
            dfs1(i);
        }
        
    }
    
}

void dfs2(int node) {
    num2++;
    if (num2 > b)
    {
        return;
    }
    toRet[node] = 2;
    for (auto i : graph[node])
    {
        if (i != parent[node] and toRet[node] == 3)
        {
            if(num1 > a) {
                return;
            }
            dfs2(i);
        }
        
    }
    
}

vector<int> find_split(int ln, int la, int lb, int lc, vector<int> p, vector<int> q) {
    n = ln;
    a = la;
    b = lb;
    c = lc;
    vector<int> v = {a, b, c};
    sort(v.begin(), v.end());
    a = v[0];
    b = v[1];
    c = v[2];
    
    for (int i = 0; i < p.size(); i++)
    {
        graph[p[i]].push_back(q[i]);
        graph[q[i]].push_back(p[i]);
    }
    for (int i = 0; i < n; i++)
    {
        toRet.push_back(3);
    }
    num = 0;
    dfs(0, -1);
    int best = n+1;
    int bestVertex = -1;
    for (int i = 0; i < n; i++)
    {
        if (subSize[i] >= a)
        {
            if (best > subSize[i])
            {
                best = subSize[i];
                bestVertex = i;
            }
        }
    }
    
    //cout << "Best is " << best << " at vertex " << bestVertex << "\n";
    if (n - best < b)
    {
        for (int i = 0; i < n; i++)
        {
            toRet[i] = 0;
            
        }
        return toRet;
    }
    dfs1(bestVertex);
    dfs2(0);
    return toRet;
}

Compilation message (stderr)

split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < p.size(); i++)
                     ~~^~~~~~~~~~

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