Submission #620563

#	Time	Username	Problem	Language	Result	Execution time	Memory
620563		wiwiho	Stations (IOI20_stations)	C++14	73.36 / 100	1013 ms	776 KiB

stations

#include "stations.h"

#include <bits/stdc++.h>

#define iter(a) a.begin(), a.end()
#define lsort(a) sort(iter(a))
#define gsort(a) sort(iter(a), greater<>())
#define eb emplace_back
#define ef emplace_front
#define pob pop_back()
#define pof pop_front()
#define mp make_pair
#define F first
#define S second
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define printv(a, b) { \
    for(auto pv : a) b << pv << " "; \
    b << "\n"; \
}

using namespace std;

typedef long long ll;
typedef long double ld;

using pii = pair<int, int>;
using pll = pair<ll, ll>;

template<typename A, typename B>
ostream& operator<<(ostream& o, pair<A, B> p){
    return o << '(' << p.F << ',' << p.S << ')';
}

const int N = 2000;

vector<int> label(int n, int k, vector<int> u, vector<int> v) {

    vector<vector<int>> g(n);
    vector<int> ans(n);
    int ts = -1;

    function<void(int, int, int)> dfs = [&](int now, int p, int d){
        int in = ++ts;
        for(int i : g[now]){
            if(i == p) continue;
            dfs(i, now, d + 1);
        }
        int out = ++ts;
        if(d % 2 == 0) ans[now] = in;
        else ans[now] = N + out;
    };

    for(int i = 0; i < n - 1; i++){
        g[u[i]].eb(v[i]);
        g[v[i]].eb(u[i]);
    }
    for(int i = 0; i < n; i++){
        if(g[i].size() > 1) continue;
        dfs(i, i, 0);
        break;
    }

    //cerr << "label ";
    //printv(ans, cerr);

    return ans;
}

int find_next_station(int s, int t, vector<int> c) {
    if(c.size() == 1) return c[0];
    //cerr << "find " << s << " " << t << " : ";
    //printv(c, cerr);

    int tmp = t >= N ? t - N : t;
    //cerr << "tmp " << tmp << "\n";
    if(s < N){
        int in = s;
        for(int i = 0; i < (int)c.size() - 1; i++){
            int a = i == 0 ? in + 1 : c[i - 1] - N + 1;
            int b = c[i] - N;
            //cerr << "test " << i << " " << a << " " << b << "\n";
            if(a <= tmp && tmp <= b) return c[i];
        }
        return c.back();
    }
    else{
        int out = s - N;
        for(int i = 1; i < (int)c.size(); i++){
            int a = c[i];
            int b = i == (int)c.size() - 1 ? out : c[i + 1] - 1;
            //cerr << "test " << i << " " << a << " " << b << "\n";
            if(a <= tmp && tmp <= b) return c[i];
        }
        return c[0];
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 47.3608 / 61