Spiraali

#include <iostream>
#include <string>
#include <map>
#include <vector>
#include <algorithm>

#define ll long long

using namespace std;

ll gne(ll n, ll x, ll y) {
    vector<ll> dists;
    dists.push_back(y);
    dists.push_back(n-y-1);
    dists.push_back(x);
    dists.push_back(n-x-1);

    ll m = *min_element(dists.begin(), dists.end());

    return m;
}

ll oddsum(ll n) {
    n = n + 1;
    n = n / 2;
    return n*n;
}


ll getltop(ll n, ll l) {
    //cout << "n: " << n << "\n";

    //cout << oddsum(5) << "\n";

    return 4*(oddsum(n-1)-oddsum(n-1-2*l)) + 1;
}

ll test(ll n, ll x, ll y) {
    ll l = gne(n,x,y);
    ll ltop = getltop(n,l);

    ll llen = n-2*l-1;

    //cout << "l: " << l << "ltop: " << ltop << " llen: " << llen <<"\n";

    if (x == l){
        //cout << "left";
        return ltop + (y - l);
    }

    if ((y-l) == llen) {
        //cout << "bot";
        return ltop + llen + (x-l);
    }

    if ((x-l) == llen) {
        //cout << "right";
        return ltop + 3*llen - (y-l);
    }

    if (y == l) {
        //cout << "top";
        return ltop + 4*llen - (x-l);
    }

    //cout << "FAIL\n";
    return 0;


}

int main() {
    ll n, t;
    cin >> n >> t;

    

    for(ll i=0; i<t; i++){
        ll x, y;
        cin >> y >> x;
        cout << test(n,x-1,y-1) << "\n";
    }

    return 0;

}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED