Submission #514926

#	Time	Username	Problem	Language	Result	Execution time	Memory
514926		cadmiumsky	Cat (info1cup19_cat)	C++14	15 / 100	732 ms	16268 KiB

cat

#include <bits/stdc++.h>

using namespace std;

static void testcase() {
  int n;
  cin >> n;
  vector<int> v(n + 5, 0);
  for(int i = 0; i < n; i++) {
    cin >> v[i];
  }
  int inv = 0;
  for(int i = 0; i < n / 2; i++) {
    if((v[i] <= (n / 2)) == (v[n - i - 1] <= (n / 2))) {
      cout << "-1\n";
      return;
    }
    if(v[i] + v[n - i - 1] != n + 1) {
      cout << "-1\n";
      return;
    }
    inv += (v[i] > (n / 2));
  }
  if(inv % 2 == 1) {
    cout << "-1\n";
    return;
  }
  cout << "1 1\n1 2\n";
}

int main() {
  int t;
  cin >> t;
  while(t--)
    testcase();
}

• Subtask 1: 2.25 / 15
• Subtask 2: 1.5 / 10
• Subtask 3: 3.75 / 25
• Subtask 4: 2.25 / 15
• Subtask 5: 5.25 / 35