Submission #565167

#	Time	Username	Problem	Language	Result	Execution time	Memory
565167		Ronin13	Stations (IOI20_stations)	C++14	100 / 100	855 ms	828 KiB

stations

#include "stations.h"
#include <vector>
#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
#define ull unsigned ll
using namespace std;


const int inf = 1e9 + 1;
const ll linf = 1e18 + 1;
const int NMAX = 1001;

vector <vector <int> > g (NMAX);
vector <int> col(NMAX);
int timer = 0;
vector <int> t_in(NMAX);
vector <int> t_out(NMAX);
void dfs(int v,  int e = -1){
    t_in[v] = timer++;
    for(int to : g[v]){
        if(to == e) continue;
        col[to] = 1 ^ col[v];
        dfs(to, v);
    }
    t_out[v] = timer++;
}



std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
    for(int v = 0; v < n; v++){
        t_in[v] = t_out[v] = col[v] = 0;
        g[v].clear();
        timer = 0;
    }
	std::vector<int> labels(n);
	for(int i = 0; i < n - 1; i++){
        int uu = u[i], vv = v[i];
        g[uu].pb(vv);
        g[vv].pb(uu);
	}
	dfs(0);
	vector <pii> vec;
    for(int i = 0; i < n; i++){
        if(col[i] == 0) vec.pb({t_in[i], i});
        else vec.pb({t_out[i], i});
    }
    sort(vec.begin(), vec.end());
    int ind = 0;
    for(auto to : vec){
        int x = to.f, y = to.s;
        labels[y] = ind++;
    }
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
	bool bl = false;
    if(c[0] > s) bl = true;
    if(bl){
        sort(c.begin(), c.end());
        if(t >= c.back()) return c.back();
        //if(c[0] >= t ) return c.back();
        if(t < s) return c.back();
        for(int i = c.size() - 1 ; i >= 0; i--){
            if(c[i] < t) return c[i + 1];
        }
        return c[0];
    }
    else{
        sort(c.begin(), c.end());
        /*for(int to : c){
            cout << to << " ";
        }*/
        if(t > s) return c[0];
        if(t <= c[0]) return c[0];
        //if(c.back() <= t) return c[0];
        for(int i = 0; i < c.size(); i++){
            if(c[i] > t) return c[i - 1];
        }
        return c.back();
    }
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:57:13: warning: unused variable 'x' [-Wunused-variable]
   57 |         int x = to.f, y = to.s;
      |             ^
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:84:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |         for(int i = 0; i < c.size(); i++){
      |                        ~~^~~~~~~~~~

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