Submission #537305

#	Time	Username	Problem	Language	Result	Execution time	Memory
537305		ERH	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1085 ms	20368 KiB

shoes

#include <iostream>
#include <vector>
using namespace std;
vector<int> lista[100000][2];
int temp[100000];
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;
      if(!lista[a][0].empty()){
        int temp1=i, temp2=lista[a][0].front();
        for(int j=0; j<i; ++j){
          temp1+=temp[j];
        }
        for(int j=0; j<lista[a][0].front(); ++j){
          temp2+=temp[j];
        }
        total+=temp1-temp2;
        temp[lista[a][0].front()]++;
        temp[i]--;
        lista[a][0].erase(lista[a][0].begin());
      } else {
        lista[a][1].push_back(i);
      }
    } else {
      if(!lista[a][1].empty()){
        int temp1=i, temp2=lista[a][1].front();
        for(int j=0; j<i; ++j){
          temp1+=temp[j];
        }
        for(int j=0; j<lista[a][1].front(); ++j){
          temp2+=temp[j];
        }
        total+=temp1-temp2;
        temp[lista[a][1].front()]++;
        total--;
        temp[i]--;
        lista[a][1].erase(lista[a][1].begin());
      } else {
        lista[a][0].push_back(i);
      }
    }
  }
  return total;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:8:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |   for(int i=0; i<v.size(); ++i){
      |                ~^~~~~~~~~

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