Submission #754721

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
754721	2023-06-08 12:46:19	Stickfish	Cat (info1cup19_cat)	C++17	100 / 100	471 ms	21256 KiB

cat

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#include <iostream>
#include <cassert>
#include <vector>
using namespace std;
void solve() {
    int n;
    cin >> n;
    vector<int> p(n);
    for (int i = 0; i < n; ++i)
        cin >> p[i], --p[i];
    for (int i = 0; i < n; ++i) if (p[i] + p[n - i - 1] != n - 1) {
        cout << "-1\n";
        return;
    }
    int e1 = 0;
    for (int i = 0; i < n / 2; ++i)
        e1 += p[i] >= n / 2;
    if (e1 % 2) {
        cout << "-1\n";
        return;
    }
    vector<int> rp(n);
    for (int i = 0; i < n; ++i)
        rp[p[i]] = i;
    vector<int> pcp(n / 2);
    vector<bool> pcp_leap(n / 2);
    for (int  i = 0; i < n / 2; ++i) {
        if (p[i] < n / 2) {
 
 
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• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 15 / 15
• Subtask 5: 35 / 35