Submission #783093

#	Time	Username	Problem	Language	Result	Execution time	Memory
783093		Andrey	Cat (info1cup19_cat)	C++14	40 / 100	189 ms	1548 KiB

cat

#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];
            swap(p[a],p[b]);
            swap(p[n-a+1],p[n-b+1]);
            br++;
        }
    }
    for(int i = 1; i <= n/2; i++) {
        if(p[i] == n-i+1) {
            br++;
        }
    }
    cout << br << " " << 0 << "\n";
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int t;
    cin >> t;
    while(t--) {
        solve();
    }
    return 0;
}

• Subtask 1: 6 / 15
• Subtask 2: 4 / 10
• Subtask 3: 10 / 25
• Subtask 4: 6 / 15
• Subtask 5: 14 / 35