Submission #806862

#	Time	Username	Problem	Language	Result	Execution time	Memory
806862		borisAngelov	Stations (IOI20_stations)	C++17	52.32 / 100	772 ms	764 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>

using namespace std;

const int maxn = 1005;

vector<int> g[maxn];

int tim = 0;

vector<int> hashed;

void dfs(int node, int par)
{
    hashed[node] = tim * 1000;
    ++tim;

    for (int i = 0; i < g[node].size(); ++i)
    {
        if (g[node][i] != par)
        {
            dfs(g[node][i], node);
        }
    }

    hashed[node] += (tim - 1);
}

vector<int> label(int n, int k, vector<int> u, vector<int> v)
{
    for (int i = 0; i < n; ++i)
    {
        g[i].clear();
    }

    for (int i = 0; i < u.size(); ++i)
    {
        int x = u[i];
        int y = v[i];

        g[x].push_back(y);
        g[y].push_back(x);
    }

    hashed.clear();
    hashed.resize(n);

    tim = 0;

    dfs(0, -1);

    return hashed;
}

int find_next_station(int s, int t, vector<int> c)
{
    int in_s = s / 1000;
    int out_s = s % 1000;

    int in_t = t / 1000;
    int out_t = t % 1000;

    if (in_s <= in_t && out_t <= out_s)
    {
        int from = (in_s == 0 ? 0 : 1);

        for (int i = from; i < c.size(); ++i)
        {
            int in_i = c[i] / 1000;
            int out_i = c[i] % 1000;

            if (in_i <= in_t && out_t <= out_i)
            {
                return c[i];
            }
        }
    }

    return c[0];
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, int)':
stations.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i = 0; i < g[node].size(); ++i)
      |                     ~~^~~~~~~~~~~~~~~~
stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for (int i = 0; i < u.size(); ++i)
      |                     ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:68:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         for (int i = from; i < c.size(); ++i)
      |                            ~~^~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3205 / 61