Spiraali

#include <bits/stdc++.h>
using namespace std;
 
unsigned long long getNum(unsigned long long n, unsigned long long x, unsigned long long y) {
	if(x == 1) {
		return y;
	}
	else {
		unsigned long long tcx, tcy;
		tcx = min(n-x, x);
		tcy = min(n-y, y);
		bool p = false;

		if(x <= n-y) { //v
			p = false;
		}
		else {
			p = true;
		}
	
		if(p) {
			if(tcx <= tcy) {
				return ((tcx*2+1)*2*n- (tcx*2+1)*(tcx*2+1) + n - y - (tcx-1/2));
			}
			else {
				return ((tcy*2+1)*(2*n-(tcy*2+1)) - n + (x + (tcy*2+1)/2));
			}
		}
		else {
//((tcx + (n-x < x ? 1 : 0))%2==0 && tcy%2==0) || 
			if(tcx - (((tcx + (n-x < x ? 1 : 0))%2==0 && tcy%2==0) || ((tcx + (n-x < x ? 1 : 0)) == tcy && (tcx + (n-x < x ? 1 : 0))%2==1) ? 1 : 0) < tcy) {
				return ((tcx-1)*2*(2*n-(tcx-1)*2) - ((tcx-1)*2-1)/2 + y - 1);
			}
			else {
				return (tcy*2*(2*n-tcy*2) - x + tcy*2/2 + 1);
			}
		}
	}
}
 
int main () {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	unsigned long long n, t, x, y;
	cin >> n >> t;
	for(unsigned long long i = 0; i < t; i++) {
		cin >> y >> x;
		cout << getNum(n, x, y) << ((i % n == n-1) ? "\n" : " ");
	}
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED