Spiraali

#include <iostream>
#include <vector>
using namespace std;

int main() 
{
    double n, t;
    vector<int>tests;
    
    cin >> n >> t;

    for (double a = 0; a < t; a++)
    {
        double x, y;
        cin >> y >> x;
        tests.push_back(x);
        tests.push_back(y);
    }
    vector<double>grid(n * n);
    
    int x = 0, y = 0, s = 2, step = n - 1, dir = 0; bool l = false;
    float v = 1;
    while (v <= n * n)
    {
        for (int z = 0; z <= s; z++)
        {
            for (int a = 0; a < step; a++)
            {
                if (v <= n*n)grid[(long int)(y * n + x)] = v;
                v++;
                if (dir == 0)y++;
                if (dir == 1)x++;
                if (dir == 2)y--;
                if (dir == 3)x--;
            }
            dir++;
            if (dir > 3)dir = 0;
        }
        if (step > 1)step--;
        if (!l)l = true, s--;
    }

    for (double a = 0; a < tests.size() / 2; a++)
    {
        float x = tests[a * 2 + 0] - 1;
        float y = tests[a * 2 + 1] - 1;
        cout << grid[y * n + x] << "\n";
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc