Submission #432574

#	Time	Username	Problem	Language	Result	Execution time	Memory
432574		milleniumEeee	Stations (IOI20_stations)	C++17	36.23 / 100	1162 ms	784 KiB

stations

#ifndef EVAL
#include "stub.cpp"
#endif
#include "stations.h"
 
#include <bits/stdc++.h>
#define fr first
#define sc second
#define pii pair<int, int>
#define pb push_back
#define szof(s) (int)s.size()
#define all(s) s.begin(), s.end()
 
using namespace std;
 
const int MAXN = 1005;

vector <int> g[MAXN];
int tin[MAXN], tout[MAXN], tiktak = 0;
int pr[MAXN];

void clean() {
	for (int i = 0; i < MAXN; i++) {
		g[i].clear();
		tin[i] = 0;
		tout[i] = 0;
		pr[i] = 0;
	}
	tiktak = 0;
}


void precalc(int v, int par) {
	tin[v] = ++tiktak;
	pr[v] = par;
	for (int to : g[v]) {
		if (to != par) {
			precalc(to, v);
		}
	}
	tout[v] = tiktak;
}

void up(int v, vector <int> &vec) {
	vec.pb(v);
	if (pr[v] != -1) {
		up(pr[v], vec);
	}
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	clean(); // на всякий случай
	for (int i = 0; i <= n - 2; i++) {
		int x = u[i];
		int y = v[i];
		g[x].pb(y);
		g[y].pb(x);
	}
	precalc(0, -1);
	vector <int> labels(n);
	for (int i = 0; i < n; i++) {
		// 10 битов для tin
		// 10 битов для tout
		labels[i] = tin[i] + (tout[i] << 10);
	}
	return labels;
}

bool father(int a, int b) {
	int tin_a = 0;
	int tout_a = 0;
	int tin_b = 0;
	int tout_b = 0;
	for (int i = 0; i < 30; i++) {
		if (a & (1 << i)) {
			if (i <= 9) {
				tin_a += (1 << i);
			} else {
				tout_a += (1 << (i - 10));
			}
		}
		if (b & (1 << i)) {
			if (i <= 9) {
				tin_b += (1 << i);
			} else {
				tout_b += (1 << (i - 10));
			}
		}
	}
	return tin_a <= tin_b && tout_b <= tout_a;
}

int find_next_station(int s, int t, vector<int> c) {
	if (father(s, t)) {
		for (int el : c) {
			if (father(s, el) && father(el, t)) {
				return el;
			}
		}
	}
	for (int el : c) {
		if (father(el, s)) {
			return el;
		}
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:106:1: warning: control reaches end of non-void function [-Wreturn-type]
  106 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.2265 / 61