Submission #1305569

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305569		ayaz	Arranging Shoes (IOI19_shoes)	C++20	10 / 100	1 ms	344 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);
  if (n == 2) {
    return (a[0] > 0);
  }
  int ans = 0;
  for (int i = 0; i < n; i++) {
    int d = 1e9;
    for (int j = i + 1; j >= 0; j--) {
      if (a[i] + a[j] == 0 && abs(d - i) >= abs(j - i)) {
        d = j;
      }
    }
    if (d == i + 1 || d == i - 1) continue;
    int v = a[d];
    a.erase(a.begin() + d);
    a.insert(a.begin() + 1 + i, v);
    ans += (d > i ? d - (i + 1) : (i - 1) - d);
  }
  for (int i = 0; i < n; i += 2) {
    ans += (a[i] > 0);
  }
  return ans;
}

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