Submission #432395

#	Time	Username	Problem	Language	Result	Execution time	Memory
432395		idk321	Stations (IOI20_stations)	C++17	74.46 / 100	913 ms	980 KiB

stations

#include "stations.h"
#include <vector>

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

const int M = 1000000000;
const int N = 1000;
int in[N];
int out[N];
vector<int> adj[N];
vector<int> labels;

int n, k;

int timer;

int type[N];


void dfs2(int node, int par)
{
    if (par == -1)
    {
        type[node] = 0;

    } else
    {
        type[node] = !type[par];

    }


    in[node] = timer;
    timer++;

    for (int next : adj[node])
    {
        if (next == par) continue;
        dfs2(next, node);
    }

    out[node] = timer;
    timer++;
}


const int add = 2000;


std::vector<int> label(int n1, int k1, std::vector<int> u, std::vector<int> v) {
    n = n1;
    k = k1;

    labels.assign(n, 0);


    for (int i = 0; i < n; i++) adj[i].clear();
    for (int i = 0; i < u.size(); i++)
    {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }




    timer = 0;
    dfs2(0, -1);



    for (int i = 0; i < n; i++) {
        if (type[i] == 0) labels[i] = in[i];
        else labels[i] = out[i];
    }
    vector<int> numbers;
    for (int i : labels) numbers.push_back(i);
    sort(numbers.begin(), numbers.end());
    map<int, int> turnTo;
    int cur = 0;
    for (int i : numbers)
    {
        turnTo[i] = cur;
        cur++;
    }

    for (int i = 0; i < labels.size(); i++)
    {
        labels[i] = turnTo[labels[i]];
    }
    for (int i = 0;  i< labels.size(); i++)
    {
        if (type[i] == 0) labels[i] += add;
    }

    return labels;
}



int find_next_station(int s, int t, std::vector<int> c) {
    if (t >= add) t -= add;
    if (s >= add)
    {
        s -= add;
        int par = -1;
        if (s != 0)
        {
            for (int next : c)
            {
                if (par < next)
                {
                    par = next;
                }
            }
        }


        if (t < s) return par;

        int take = M;
        for (int next : c)
        {
            if (next == par) continue;
            if (next < take && next >= t)
            {
                take = next;
            }

        }
        if (take == M) return par;
        return take;
    } else
    {
        int par = M;
        for (int& next : c)
        {

            next -= add;
            if (next < par) par = next;
        }


        if (t > s) return par + add;
        vector<int> children;
        for (int next : c)
        {
            if (next == par) continue;
            children.push_back(next);
        }


        if (t <= par) return par + add;

        int take = -1;
        for (int i = 0; i < children.size(); i++)
        {
            if (children[i] > t) break;
            take = i;
        }

        if (take == -1) return par + add;
        return children[take] + add;
    }






    return c[0];
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for (int i = 0; i < u.size(); i++)
      |                     ~~^~~~~~~~~~
stations.cpp:88:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |     for (int i = 0; i < labels.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~
stations.cpp:92:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |     for (int i = 0;  i< labels.size(); i++)
      |                      ~^~~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:157:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  157 |         for (int i = 0; i < children.size(); i++)
      |                         ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 48.4576 / 61