Submission #849359

#	Time	Username	Problem	Language	Result	Execution time	Memory
849359		IBory	Stations (IOI20_stations)	C++17	100 / 100	554 ms	1588 KiB

stations

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

const int MAX = 1004;
vector<int> G[MAX], ans;
int in[MAX], out[MAX], dn;

void DFS(int cur, int prev, int H) {
	in[cur] = dn++;
	for (int next : G[cur]) {
		if (next == prev) continue;
		DFS(next, cur, H + 1);
	}
	out[cur] = dn++;
	ans[cur] = ((H & 1) ? out[cur] : in[cur]);
}

vector<int> label(int N, int K, vector<int> U, vector<int> V) {
	for (int i = 0; i < N - 1; ++i) {
		G[U[i]].push_back(V[i]);
		G[V[i]].push_back(U[i]);
	}
	ans.resize(N);
	DFS(0, -1, 0);
	vector<int> T;
	for (int n : ans) T.push_back(n);
	sort(T.begin(), T.end());
	for (int& n : ans) n = lower_bound(T.begin(), T.end(), n) - T.begin();
	for (int i = 0; i < N; ++i) G[i].clear();
	dn = 0;
	return ans;
}

int find_next_station(int S, int T, vector<int> C) {
	sort(C.begin(), C.end());

	// S is in, C is out
	if (S < C[0]) {
		int pv = S;
		for (int i = 0; i + 1 < C.size(); ++i) {
			if (pv < T && T <= C[i]) return C[i];
			pv = C[i];
		}
		return C.back();
	}
	// S is out, C is in
	else {
		C.push_back(S);
		for (int i = 1; i + 1 < C.size(); ++i) {
			if (C[i] <= T && T < C[i + 1]) return C[i];
		}
		return C[0];
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:41:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for (int i = 0; i + 1 < C.size(); ++i) {
      |                   ~~~~~~^~~~~~~~~~
stations.cpp:50:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |   for (int i = 1; i + 1 < C.size(); ++i) {
      |                   ~~~~~~^~~~~~~~~~

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