Submission #1057574

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057574		boyliguanhan	Stations (IOI20_stations)	C++17	100 / 100	535 ms	1188 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
vector<int>adj[1010];
int CC;
void dfs(int n,vector<int>&cols,int dep=0,int p=-1){
    if(dep)cols[n]=CC++;
    for(auto i:adj[n])if(i-p)
        dfs(i,cols,!dep,n);
    if(!dep)cols[n]=CC++;
}
vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
    CC=0;
    for(int i=0;i<n;i++)
        adj[i].clear();
    vector<int>res(n);
    for(int i=0;i<n-1;i++)
        adj[u[i]].push_back(v[i]),
        adj[v[i]].push_back(u[i]);
    dfs(0,res);
    return res;
}

int find_next_station(int s, int t, std::vector<int> c) {
    if(s<c[0]){
        if(t<s)
            return c.back();
        for(auto i:c)
            if(t<=i)
                return i;
        return c.back();
    } else {
        if(t>s)
            return c[0];
        reverse(c.begin(),c.end());
        int prv=s;
        for(auto i:c)
            if(t>=i)
                return i;
        return c.back();
    }
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:36:13: warning: unused variable 'prv' [-Wunused-variable]
   36 |         int prv=s;
      |             ^~~

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