Submission #783093

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
783093	2023-07-14 15:21:05	Andrey	Cat (info1cup19_cat)	C++14	40 / 100	189 ms	1548 KiB

cat

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#include <bits/stdc++.h>
using namespace std;
void solve() {
    int n,a,br = 0,y,b;
    cin >> n;
    vector<int> p(n+1);
    for(int i = 1; i <= n; i++) {
        cin >> a;
        p[a] = i;
    }
    for(int i = 1; i <= n/2; i++) {
        if(p[i] > p[n-i+1]) {
            br++;
        }
        if(p[i] != n-p[n-i+1]+1) {
            cout << -1 << "\n";
            return;
        }
    }
    if(br%2) {
        cout << -1 << "\n";
        return;
    }
    br = 0;
    for(int i = 1; i <= n; i++) {
        y = i;
        while(p[y] != y && p[y] != n-y+1) {
            a = y;
            b = p[y];
 
 
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• Subtask 1: 6 / 15
• Subtask 2: 4 / 10
• Subtask 3: 10 / 25
• Subtask 4: 6 / 15
• Subtask 5: 14 / 35