Submission #400933

#	Time	Username	Problem	Language	Result	Execution time	Memory
400933		zoooma13	Stations (IOI20_stations)	C++14	100 / 100	1251 ms	744 KiB

stations

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

#define MAX_N 1003

int lbl[MAX_N] ,nn = 0;
vector <vector<int>> adj;
void dfs(int u ,int p=-1 ,int t=0){
    if(t == 0) lbl[u] = nn++;
    for(int&v : adj[u]) if(v != p)
        dfs(v ,u ,1-t);
    if(t == 1) lbl[u] = nn++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    adj.clear() ,adj.resize(n);
    for(int i = 0; i < u.size(); i++)
        adj[u[i]].push_back(v[i]),
        adj[v[i]].push_back(u[i]);
    nn = 0 ,dfs(0);
	return {lbl ,lbl+n};
}

int find_next_station(int s, int t, vector<int> c) {
	if(count(c.begin() ,c.end() ,t))
        return t;
    if(s < c.front()){
        if(t < s)
            return c.back();
        for(int&i : c) if(t <= i)
            return i;
        return c.back();
    }else{
        if(t > s)
            return c.front();
        reverse(c.begin() ,c.end());
        for(int&i : c) if(i <= t)
            return i;
        return c.back();
    }
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(int i = 0; i < u.size(); i++)
      |                    ~~^~~~~~~~~~

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