In my solution I read values like this:

        scanf("%d %d", &px[i], &py[i]);
        px[i] += 1000;
        py[i] += 1000;
        board[px[i]][py[i]] = 1;

and get access violation on test #4; however, if I add right before accessing the array:

        if (px[i] < 0 || py [i] < 0 || px[i] > 2000 || py[i] > 2000) {
            while (1);
        }

I get TLE on the same test.

Are all the values of test #4 within the bounds -1000 <= x,y <= 1000 ?!

Statement is fixed. Now -2000 <= x,y <= 2000 (as it was actually in tests). Thank you.