Submission #346599

#	Time	Username	Problem	Language	Result	Execution time	Memory
346599		Pety	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	364 KiB

shoes

#include <bits/stdc++.h>
#include "shoes.h"

using namespace std;

long long count_swaps (vector<int>v) {
  map<int, int>mp[2];
  set<pair<int, int>> s;
  long long ans = 0;
  for (int i = 0; i < v.size(); i++) {
    int x = v[i];
    auto it = s.lower_bound({-x, 0});
    if ((*it).first == -x) {
      if (x > 0)
        ans += i - (*it).second - 1;
      else
        ans += i - (*it).second;
      s.erase(it);
    }
    else
      s.insert({x, i});
  }
  return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:10:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |   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