Submission #604715

#	Time	Username	Problem	Language	Result	Execution time	Memory
604715		Tigryonochekk	Stations (IOI20_stations)	C++17	36.31 / 100	918 ms	800 KiB

stations

#include <iostream>
#include "stations.h"
#include <vector>
#define ll long long
using namespace std;
const int N = 1002;

vector<int> g[N];
vector<int> labels;
int tin[N], tout[N];
int timer = 0;

void dfs(int v, int p) {
	tin[v] = timer++;
	for (int to : g[v]) {
		if (p == to) continue;
		dfs(to, v);
	}
	tout[v] = timer;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	labels.clear();
	for (int i = 0; i < n; i++) {
		g[i].clear();
	}
	timer = 0;
	for (int i = 0; i < n - 1; i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	dfs(0, -1);
	for (int i = 0; i < n; i++) {
		labels.push_back(tin[i] * N + tout[i]);
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	if (c.size() == 1) 
		return c[0];
	int n = c.size();
	int si = s / N, so = s % N;
	int ti = t / N, to = t % N;
	vector<int> ci, co;
	for (int i = 0; i < n; i++) {
		ci.push_back(c[i] / N);
		co.push_back(c[i] % N);
	} 
	// kam c0-n s-i parentn a, kam el che. erku depqum el ete muys gagatnerov gnal, u vochmeki erexen chlini t-n, apa c0-n a.
	for (int i = 1; i < ci.size(); i++) {
		if (ci[i] <= ti && co[i] >= to) {
			return c[i];
		}
	}
	return c[0];
}
/*
1 
5 1000000000
4 2 
3 1 
0 2 
0 3 
5 
4 0 2 
2 4 4 
3 4 0 
0 1 3 
0 3 3 

1 
7 1000000000 
0 1 
0 2 
1 3 
1 4 
2 5 
2 6 
4 
0 4 1 
1 4 4 
1 5 0 
3 5 1 

1 
7 1000000000
0 3 
1 4 
2 5 
3 6 
4 6 
5 6 
4 
6 0 3 
3 0 0 
3 6 6 
3 1 6 

*/

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:51:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  for (int i = 1; i < ci.size(); i++) {
      |                  ~~^~~~~~~~~~~
stations.cpp:43:6: warning: unused variable 'si' [-Wunused-variable]
   43 |  int si = s / N, so = s % N;
      |      ^~
stations.cpp:43:18: warning: unused variable 'so' [-Wunused-variable]
   43 |  int si = s / N, so = s % N;
      |                  ^~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3129 / 61