Submission #592647

#	Time	Username	Problem	Language	Result	Execution time	Memory
592647		PiejanVDC	Stations (IOI20_stations)	C++17	100 / 100	996 ms	852 KiB

stations

#include <bits/stdc++.h>
#include "stations.h"
using namespace std;
 
vector<int>adj[1005];

vector<int>l;

int curr = 0;

void dfs(int u, bool f, int e = -1) {
    if(f)
        l[u] = curr++;
    
    for(auto z : adj[u]) if(z != e) {
        dfs(z, 1 - f, u);
    }

    if(!f)
        l[u] = curr++;
}

vector<int>label(int n, int k, vector<int>u, vector<int>v) {
    l.resize(n, -1);
    curr = 0;
    for(int i = 0 ; i < n ; i++)
        adj[i].clear();

    for(int i = 0 ; i < (int)u.size() ; i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }

    dfs(0, 1);

    for(auto z : l)
        assert(z != -1);

    return l;
}

int find_next_station(int s, int t, vector<int>c) {
    if(c.size() == 1)
        return c[0];

    if(s == 0) {
        for(int i = 0 ; i < c.size() ; i++) {
            if(t >= s && t <= c[i])
                return c[i];
        }
    }

    if(s < c[0]) {
        
        if(t <= c.back() && t <= s)
            return c.back();
        if(t >= c.back() && t >= s)
            return c.back();
        
        for(int i = 0 ; i < c.size()-1 ; i++) {
            if(t >= s && t <= c[i])
                return c[i];
        }
    } else {

        if(t <= c[0] && t <= s)
            return c[0];
        if(t >= c[0] && t >= s)
            return c[0];
    
        for(int i = c.size()-1 ; i > 0 ; i--) {
            if(t <= s && t >= c[i])
                return c[i];
        }
    }
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:47:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for(int i = 0 ; i < c.size() ; i++) {
      |                         ~~^~~~~~~~~~
stations.cpp:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         for(int i = 0 ; i < c.size()-1 ; i++) {
      |                         ~~^~~~~~~~~~~~
stations.cpp:76:1: warning: control reaches end of non-void function [-Wreturn-type]
   76 | }
      | ^

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