Submission #1305666

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305666		ayaz	Arranging Shoes (IOI19_shoes)	C++20	0 / 100	14 ms	2732 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define isz(x) (int)x.size()
long long count_swaps(std::vector<int> s) {
  vector<int> a = s;
  int n = isz(a);
  return (((n >> 1) * ((n >> 1) - 1)) >> 1);
  if (n == 2) {
    return (a[0] > 0);
  }
  int ans = 0;
  for (int i = 0; i < n; i++) {
    if (i % 2 == 0 && a[i] > 0) {
      int d = 1e9;
      for (int j = i + 1; j < n; j++) {
        if (a[j] + a[i] == 0) {
          d = j;
          break;
        }
      }
      ans += (d - i);
      for (int j = d; j > i; j--) swap(a[j], a[j - 1]);
      continue;
    }
    if (i % 2 == 1 && (a[i] < 0 || (a[i - 1] + a[i]) != 0)) {
      int d = 1e9;
      for (int j = i + 1; j < n; j++) {
        if (a[j] + a[i - 1] == 0) {
          d = j;
          break;
        }
      }
      ans += (d - i);
      for (int j = d; j > i; j--) swap(a[j], a[j - 1]);
    }
  }
  for (int i = 0; i < n; i += 2) {
    ans += (a[i] > 0);
  }
  return ans;
}

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