Submission #515605

#	Time	Username	Problem	Language	Result	Execution time	Memory
515605		Theo830	Cat (info1cup19_cat)	C++17	9.75 / 100	738 ms	6272 KiB

cat

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ii,ll>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
template <typename T> struct Bit{
    int N;
    vector<T>bit;
    void build(ll n){
        N = n+5;
        f(i,0,N){
            bit.pb(0);
        }
    }
    void upd(ll k,T x){
        while(k < N){
            bit[k] += x;
            k += k & -k;
        }
    }
    T query(ll k){
        T ans = 0;
        while(k >= 1){
            ans += bit[k];
            k -= k & -k;
        }
        return ans;
    }
};
ll c(vll a){
    ll ans = 0;
    Bit<ll>b;
    b.build(a.size() + 5);
    f(j,0,(ll)a.size()){
        ans += j - b.query(a[j]+1);
        b.upd(a[j]+1,1);
    }
    return ans;
}
int main(void){
    ll t;
    cin>>t;
    while(t--){
        ll n;
        cin>>n;
        ll arr[n];
        vll a[2];
        ll posa = 0;
        vll b;
        f(i,0,n){
            cin>>arr[i];
            if(i < n/2 && arr[i] > n/2){
                posa++;
                b.pb(n + 1 - arr[i]);
            }
            arr[i] = min(arr[i],n + 1 - arr[i]);
            a[i >= n/2].pb(arr[i]);
        }
        reverse(all(a[1]));
        if(a[0] == a[1] && (posa % 2 == 0)){
            cout<<c(a[0])<<" ";
            cout<<"0\n";
        }
        else{
            cout<<"-1\n";
        }
    }
}

• Subtask 1: 2.25 / 15
• Subtask 2: 1.5 / 10
• Subtask 3: 3.75 / 25
• Subtask 4: 2.25 / 15
• Subtask 5: 0 / 35