Submission #537291

#	Time	Username	Problem	Language	Result	Execution time	Memory
537291		ERH	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	308 KiB

shoes

#include <iostream>
#include <vector>
using namespace std;
int lista[100000][2];
long long count_swaps(vector<int> v){
  long long int total=0;
  for(int i=0; i<v.size(); ++i){
    int a=v[i];
    if(a<0){
      a=-a;
      lista[a][1]=i+1;
      if(lista[a][0]){
        total+=lista[a][1]-lista[a][0];
        lista[a][1]=lista[a][0]=0;
      }
    } else {
      lista[a][0]=i+1;
      if(lista[a][1]){
        total+=lista[a][0]-lista[a][1]-1;
        lista[a][1]=lista[a][0]=0;
      }
    }
  }
  return total;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:7:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |   for(int i=0; i<v.size(); ++i){
      |                ~^~~~~~~~~

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