Submission #926996

#	Time	Username	Problem	Language	Result	Execution time	Memory
926996		ByeWorld	Stations (IOI20_stations)	C++14	0 / 100	526 ms	1252 KiB

stations

#include "stations.h"
#include <vector>
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;
const int MAXN = 1e3+10;
const int MAX = 1e3;

int n, k;
vector <int> adj[MAXN], dw[MAXN];
vector <int> lab;
int chi[MAXN], val[MAXN], cnt;

void dfs(int nw, int par){ // build val, tergantung dfs
	val[nw] = cnt++;
	for(auto nx : adj[nw]){
		if(nx == par) continue;
		dw[nw].pb(nx);
		dfs(nx, nw);
	}
}
void bd(int nw, int par){
	chi[nw] = val[nw];
	for(auto nx : dw[nw]){
		if(nx == par) continue;
		bd(nx, nw);
		chi[nw] = max(chi[nw], chi[nx]);
	}
}

vector<int> label(int N, int K, vector<int> u, vector<int> v) {
	n = N; k = K;
	lab.clear(); lab.resize(n); cnt = 0;
	for(int i=0; i<=n; i++){
		adj[i].clear(); dw[i].clear();
		chi[i] = 0; val[i] = 0;
	}

	for(int i=0; i<n-1; i++){
		adj[u[i]].pb(v[i]); adj[v[i]].pb(u[i]);
	}

	dfs(0, -1); bd(0, -1);
	for(int i=0; i<n; i++){
		lab[i] = val[i] + chi[i]*MAX;
	}
	//for(int i=0; i<n; i++) cout << i << ' ' << val[i] << ' ' << chi[i] << ' '<< lab[i] << " p\n";
		
	return lab;
}

int find_next_station(int s, int t, vector<int> c) { // c sorted
	int num = c.size();
	vector <pii> val(num);
	for(int i=0; i<num; i++){
		val[i].fi = c[i]%MAX; val[i].se = c[i] / MAX;
		// idx, max idx di subtree
	}
	sort(val.begin(), val.end()); // based on idx
	//for(auto in : val) cout << in.fi << ' '<< in.se << " xx\n";

	int valt = t%MAX, idx = -1;
	if(s%MAX==0){ // s itu root
		for(int i=0; i<val.size(); i++){
			if(val[i].fi <= valt){
				idx = i;
			}
		}
		return (val[idx].fi + val[idx].se*MAX);
	}

	int mx = s/MAX; // kalo nx==0, brati gk ada nx
	for(int i=1; i<val.size(); i++){
		if(val[i].fi <= valt){
			idx = i;
		}
	}

	if(valt < val[1].fi || valt > mx) idx = 0; // parent
	return (val[idx].fi + val[idx].se*MAX);
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:68:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |   for(int i=0; i<val.size(); i++){
      |                ~^~~~~~~~~~~
stations.cpp:77:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |  for(int i=1; i<val.size(); i++){
      |               ~^~~~~~~~~~~

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