Submission #146070

#	Time	Username	Problem	Language	Result	Execution time	Memory
146070		DanerZein	Arranging Shoes (IOI19_shoes)	C++14	65 / 100	1087 ms	2040 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
int c,i,j,id;
long long count_swaps(std::vector<int> s) {
  bool sw=0;
  int j=s.size()/2;
  for(int i=0;i<s.size()/2;i++){
    if(s[i]*(-1)!=s[j]){
      sw=1;
      break;
    }
    if(s[i]>=0){sw=1; break;}
    if(s[j]<0){ sw=1; break;
    }
    j++;
  }
  // cout<<sw<<endl;
  if(sw==0){
    long long acum=0;
    for(int i=1;i<s.size()/2;i++){
      acum+=i;
    } 
    return acum;
  }
  else{
  c=0;
  for(int i=0;i<s.size();i+=2){
    /* for(int j=0;j<s.size();j++){
      cout<<s[j]<<" ";
    }
    cout<<endl;*/
    if(s[i]>0){
      int shoes=s[i],id;
      for(int j=i+1;j<s.size();j++){
	if(s[j]==shoes*(-1)){
	  id=j;
	  break;
	}
      }
      for(int j=id;j>i;j--){
	swap(s[j],s[j-1]);
	c++;
      }
    }
    else{
      if(s[i+1]!=s[i]*(-1)){
	int id,shoes=s[i]*(-1);
	for(int j=i+1;j<s.size();j++){
	  if(s[j]==shoes){
	    id=j;
	    break;
	  }
	}
	for(int j=id;j>i+1;j--){
	  swap(s[j],s[j-1]);
	  c++;
	}
      }
    }
   
  }
  return c;}
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:8:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<s.size()/2;i++){
               ~^~~~~~~~~~~
shoes.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=1;i<s.size()/2;i++){
                 ~^~~~~~~~~~~
shoes.cpp:28:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<s.size();i+=2){
               ~^~~~~~~~~
shoes.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int j=i+1;j<s.size();j++){
                     ~^~~~~~~~~
shoes.cpp:49:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=i+1;j<s.size();j++){
                ~^~~~~~~~~
shoes.cpp:48:6: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int id,shoes=s[i]*(-1);
      ^~
shoes.cpp:34:22: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
       int shoes=s[i],id;
                      ^~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15