Submission #555364

#	Time	Username	Problem	Language	Result	Execution time	Memory
555364		ITO	Stations (IOI20_stations)	C++17	100 / 100	775 ms	768 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> e[1000], lab;
int co;
void df(int no, int pa, bool pr) {
	if (pr) lab[no] = co++;
	for (int ed : e[no]) {
		if (ed != pa) df(ed, no, !pr);
	}
	if (!pr) lab[no] = co++;
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	co = 0;
	lab.resize(n);
	for (int i = 0; i < n; i++) e[i].clear();
	for (int i = 0; i < n - 1; i++) {
		e[u[i]].push_back(v[i]);
		e[v[i]].push_back(u[i]);
	}
	df(0, 0, 1);
	return lab;
}

int find_next_station(int s, int t, std::vector<int> c) {
	if (c[0] < s) {
		if (t < c[0] || t > s) return c[0];
		for (int i = c.size() - 1; i >= 0; i--) if (c[i] <= t) return c[i];
	} else {
		if (t > c.back() || t < s) return c.back();
		for (int i = 0; i < c.size(); i++) if (c[i] >= t) return c[i];
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:31:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |   for (int i = 0; i < c.size(); i++) if (c[i] >= t) return c[i];
      |                   ~~^~~~~~~~~~
stations.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type]
   33 | }
      | ^

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