Submission #307382

#	Time	Username	Problem	Language	Result	Execution time	Memory
307382		arthur_nascimento	Stations (IOI20_stations)	C++14	0 / 100	852 ms	1024 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define debug
#define maxn 1010
int ini[maxn];
int fim[maxn];
int h[maxn];
vector<int> L[maxn];

int cur = 0;
void dfs(int x,int p=-1){
	debug("dfs %d\n",x);
	ini[x] = cur++;
	for(int i : L[x])
		if(i != p){
			h[i] = 1 + h[x];
			dfs(i,x);
		}
	//fim[x] = cur++;
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	cur = 0;
	for(int i=0;i<n;i++)
		L[i].clear(), h[i] = ini[i] = fim[i] = 0;
	for(int i=0;i<n-1;i++){
		L[u[i]].pb(v[i]);
		L[v[i]].pb(u[i]);
	}
	for(int i=0;i<n;i++){
		if(L[i].size() == 1){
			dfs(i);
			break;
		}
	}
	
	vector<int> ret;
	for(int i=0;i<n;i++){
		ret.pb(i);
	}
	for(int i : ret)
		debug("%d ",i);
	debug("\n");
	return ret;
}

int find_next_station(int s, int t, std::vector<int> c) {

	if(t < s){
		return (s-1)/2;
	}

	while((t-1)/2 > s) t = (t-1)/2;
	return t;

	if(t > s) return s+1;
	else return s-1;

	debug("qr %d %d ~",s,t); for(int i : c) debug("%d ",i); debug("\n");
	if(c.size() == 1) return c[0];
	sort(c.begin(), c.end());
	if(s < c[0]){
		// S é entrada, c[i] é saida
		int pai = c[c.size()-1];
		if(t < s) return pai;
		if(c.size() >= 2 && t > c[c.size()-2]) return pai;
		for(int i=0;i<c.size();i++){
			if(t <= c[i])
				return c[i];
		}
		
	}
	else {
		// S é saida, c[i] é entrada
		int pai = c[0];
		if(t > s) return pai;
		if(t < c[1]) return pai;
		for(int i=1;i<c.size()-1;i++){
			if(t < c[i+1]) return c[i];
		}
		return c[c.size()-1];
	}
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, int)':
stations.cpp:14:8: warning: left operand of comma operator has no effect [-Wunused-value]
   14 |  debug("dfs %d\n",x);
      |        ^~~~~~~~~~
stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:44:9: warning: left operand of comma operator has no effect [-Wunused-value]
   44 |   debug("%d ",i);
      |         ^~~~~
stations.cpp:45:8: warning: statement has no effect [-Wunused-value]
   45 |  debug("\n");
      |       ~^~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:61:8: warning: left operand of comma operator has no effect [-Wunused-value]
   61 |  debug("qr %d %d ~",s,t); for(int i : c) debug("%d ",i); debug("\n");
      |        ^~~~~~~~~~~~
stations.cpp:61:23: warning: right operand of comma operator has no effect [-Wunused-value]
   61 |  debug("qr %d %d ~",s,t); for(int i : c) debug("%d ",i); debug("\n");
      |                       ^
stations.cpp:61:48: warning: left operand of comma operator has no effect [-Wunused-value]
   61 |  debug("qr %d %d ~",s,t); for(int i : c) debug("%d ",i); debug("\n");
      |                                                ^~~~~
stations.cpp:61:64: warning: statement has no effect [-Wunused-value]
   61 |  debug("qr %d %d ~",s,t); for(int i : c) debug("%d ",i); debug("\n");
      |                                                               ~^~~~~
stations.cpp:69:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |   for(int i=0;i<c.size();i++){
      |               ~^~~~~~~~~
stations.cpp:80:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |   for(int i=1;i<c.size()-1;i++){
      |               ~^~~~~~~~~~~

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