Submission #580918

#	Time	Username	Problem	Language	Result	Execution time	Memory
580918		Jomnoi	Stations (IOI20_stations)	C++17	52.32 / 100	1039 ms	832 KiB

stations

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

const int MAX_N = 1005;

int N, timer;
vector <int> graph[MAX_N];
int st[MAX_N], en[MAX_N];

void init(int n) {
	N = n, timer = 0;
	for(int i = 0; i < N; i++) {
		st[i] = en[i] = 0;
		graph[i].clear();
	}
}

void dfs(int u, int p) {
	st[u] = timer++;
	for(auto v : graph[u]) {
		if(v != p) {
			dfs(v, u);
		}
	}
	en[u] = timer - 1;
}

vector <int> label(int n, int k, vector <int> u, vector <int> v) {
	init(n);

	for(int i = 0; i < N - 1; i++) {
		graph[u[i]].push_back(v[i]);
		graph[v[i]].push_back(u[i]);
	}

	dfs(0, -1);

	vector <int> labels(N);
	for(int i = 0; i < N; i++) {
		labels[i] = st[i] * 1000 + en[i];
	}
	return labels;
}

int find_next_station(int s, int t, vector <int> c) {
	int stS = s / 1000, enS = s % 1000;
	int stT = t / 1000, enT = t % 1000;
	for(int i = 1; i < c.size(); i++) {
		int stC = c[i] / 1000, enC = c[i] % 1000;

		if(stC <= stT and enT <= enC) {
			return c[i];
		}
	}
	return c[0];
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:49:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |  for(int i = 1; i < c.size(); i++) {
      |                 ~~^~~~~~~~~~
stations.cpp:47:6: warning: unused variable 'stS' [-Wunused-variable]
   47 |  int stS = s / 1000, enS = s % 1000;
      |      ^~~
stations.cpp:47:22: warning: unused variable 'enS' [-Wunused-variable]
   47 |  int stS = s / 1000, enS = s % 1000;
      |                      ^~~

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