Submission #433398

#	Time	Username	Problem	Language	Result	Execution time	Memory
433398		Enkognit	Stations (IOI20_stations)	C++14	100 / 100	901 ms	864 KiB

stations

#include <bits/stdc++.h>
#include "stations.h"
#include <vector>
#define ll long long
#define mp make_pair
#define pb push_back
#define fi first
#define se second

using namespace std;

vector<int> c[1005];
vector<int> vv;
ll T;

void dfs(int h,int k, int p)
{
    if (k%2==0) vv[h]=T++;
    for (int i = 0; i < c[h].size(); i++)
        if (c[h][i]!=p)
        {
            dfs(c[h][i], k+1, h);
        }
    if (k%2) vv[h]=T++;
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {

	vector<int> f;

	vv.resize(n, 0);

	T=0;


	vector<pair<ll, ll> > ed;

	for (int i = 0; i < u.size(); i++)
    {
        ed.pb(mp(u[i], v[i]));
        c[u[i]].pb(v[i]);
        c[v[i]].pb(u[i]);
    }


    dfs(0, 0, 0);

    f.resize(n, 0);

    f=vv;

    vv.clear();

    //for (int i = 0; i < n; i++) cout << vv[i] << "\n";

    //for (int i = 0; i < ed.size(); i++)
    //    cout << vv[ed[i].fi] << " " << vv[ed[i].se] << "\n";

    //cout << "---\n";

	for (int i = 0; i < n; i++) c[i].clear();

	return f;
}

int find_next_station(int s, int t, std::vector<int> c)
{

    /*cout << c.size() << " : ";
    for (int i = 0; i < c.size(); i++)
        cout << c[i] << " ";
    cout << "\n";
    cout << s << "\n";*/

    if (s==t) return s;
    if (c.size()==1) return c[0];

    //cout << "\n";
    //assert((int)c.size()==0);

    if (s<c[0])
    {
        if (t<s) return c.back();
        for (int i = 0; i < c.size(); i++)
            if (t<=c[i]) return c[i];
        return c.back();
    }else
    {
        if (t>s) return c[0];
        for (int i = c.size()-1; i > -1; i--)
            if (t>=c[i]) return c[i];
        return c[0];
    }
    assert(0);
    return 1;
}
/*
1
5 10
0 1
1 2
1 3
2 4
2
2 0 2
1 3 3
*/

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, 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 < c[h].size(); i++)
      |                     ~~^~~~~~~~~~~~~
stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:38:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |  for (int i = 0; i < u.size(); i++)
      |                  ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:84:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |         for (int i = 0; i < c.size(); i++)
      |                         ~~^~~~~~~~~~

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