Submission #1090649

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090649		onlk97	Stations (IOI20_stations)	C++14	100 / 100	636 ms	1300 KiB

stations

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

vector <int> g[1010];
int in[1010],out[1010],dep[1010],tme;
void dfs(int cur,int prv){
    if (prv==-1) dep[cur]=0;
    else dep[cur]=dep[prv]+1;
    in[cur]=++tme;
    for (int i:g[cur]){
        if (i==prv) continue;
        dfs(i,cur);
    }
    out[cur]=++tme;
}
vector <int> label(int n,int k,vector <int> u,vector <int> v){
    for (int i=0; i<n; i++) g[i].clear();
    tme=-1;
    for (int i=0; i<n-1; i++){
        g[u[i]].push_back(v[i]);
        g[v[i]].push_back(u[i]);
    }
    dfs(0,-1);
    vector <int> ret(n);
    for (int i=0; i<n; i++){
        if (dep[i]%2==0) ret[i]=in[i];
        else ret[i]=out[i];
    }
    vector <int> cpy=ret;
    sort(cpy.begin(),cpy.end());
    for (int i=0; i<n; i++) ret[i]=lower_bound(cpy.begin(),cpy.end(),ret[i])-cpy.begin();
    return ret;
}

int find_next_station(int s,int t,vector <int> c){
    if (c.size()==1) return c[0];
    if (binary_search(c.begin(),c.end(),t)) return t;
    if (s>*max_element(c.begin(),c.end())){
        for (int i=1; i+1<c.size(); i++){
            if (c[i]<=t&&t<c[i+1]) return c[i];
        }
        if (t>s||t<c[1]) return c.front();
        return c.back();
    }
    if (!s){
        for (int i=0; i<c.size(); i++){
            if (t<=c[i]) return c[i];
        }
    }
    for (int i=1; i+1<c.size(); i++){
        if (c[i-1]<t&&t<=c[i]) return c[i];
    }
    if (t<s||t>c[c.size()-2]) return c.back();
    return c.front();
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:41:26: 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=1; i+1<c.size(); i++){
      |                       ~~~^~~~~~~~~
stations.cpp:48:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         for (int i=0; i<c.size(); i++){
      |                       ~^~~~~~~~~
stations.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     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