Submission #295704

#	Time	Username	Problem	Language	Result	Execution time	Memory
295704		fire_cloud	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
#define ll long long int
#define maxn 110000
using namespace std;

bool visited[maxn];
set<ll>izq[maxn]; // siempre van a mantener los indices originales
set<ll>der[maxn]; // siempre van a mantener los indices originales

vector< pair<ll,ll> >segmentos; // siempre va a mantener los indices originales

ll verdadero_indice(ll x){
	ll suma = 0;
	for(ll i = 0;i<segmentos.size();i++){
		if(x>= segmentos[i].first  &&  x<= segmentos[i].second){
			suma++;
		}
	}
	return suma + x;
}

long long count_swaps(std::vector<int> s) {
	
	
	ll n = s.length()/2;

	ll x,y;
	ll swaps = 0;
	
	for(ll i = 0; i < 2*n ; i++){
		if(s[i] < 0){
			izq[s[i]*-1].insert(i);
		}
		else{
			der[s[i]].insert(i);
		}
	}	
	
	
	memset(visited, false,sizeof visited);
	// NUNCA vas a editar las posiciones del verdadero arreglo 
	for(ll i = 0; i < 2*n; ){
		if(visited[i]) {i++; continue;}   // si ya procesaste este numero
		visited[i] = true;
		if(i+1 < 2*n){ // si el programa falla quitar esto
			if(abs(s[i]) == abs(s[i+1]) && s[i] < 0 && s[i] > 0){ // si ya estan ordenados ejemplo -2 2
				i+=2;
				continue;
			}
		} 
		if(s[i] > 0){
			swaps++;
			y = *izq[s[i]].begin();
			visited[y] = true;
			y = verdadero_indice(y);
			x = verdadero_indice(i);
			swaps += (y - x) - 1;
			segmentos.push_back( make_pair (i,*izq[s[i]].begin()) );
			izq[s[i]].erase( izq[s[i]].begin() );  
			der[s[i]].erase( i ); //der[s[i]].erase( der[s[i]].find(i) ); 
		}
		else{
			// s[i] = -2 (negativo)
			y = *der[s[i]*-1].begin();
			visited[y] = true;
			y = verdadero_indice(y);
			x = verdadero_indice(i);
			swaps+=(y - x)-1;
			segmentos.push_back(make_pair( i,*der[s[i]*-1].begin()) );
			izq[s[i]*-1].erase(i);
			der[s[i]*-1].erase(der[s[i]*-1].begin());
		}
		
		i++;	
	}

 return swaps;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int verdadero_indice(long long int)':
shoes.cpp:15:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |  for(ll i = 0;i<segmentos.size();i++){
      |               ~^~~~~~~~~~~~~~~~~
shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:26:11: error: 'class std::vector<int>' has no member named 'length'
   26 |  ll n = s.length()/2;
      |           ^~~~~~