Let $m$ and $n$ be positive integers. Let $S$ be the set of all points $(x, y)$ with integer
coordinates such that $1 \leq x,y \leq m+n-1$ and $m+1 \leq x +y \leq 2m+n-1.$ Let $L$ be the
set of the $3m+3n-3$ lines parallel to one of $x = 0, y = 0,$ or $x + y = 0$ and passing through
at least one point in $S$. For which pairs $(m, n)$ does there exist a subset $T$ of $S$ such that
every line in $L$ intersects an odd number of elements of $T$?
1. **Eliminating Other Values**

   To prove the given condition, assume a set \( T \) satisfies the constraint. For any integer \( i \), let \( x_i \) represent the number of \( k \) for which \( (i, k) \in T \), let \( y_i \) represent the number of \( k \) for which \( (k, i) \in T \), and let \( d_i \) represent the number of \( k \) for which \( (k, i-k) \in T \).

   Note that:
   \[
   \sum_{(x, y) \in T} (x+y) = \sum_{(x, y) \in T} x + \sum_{(x, y) \in T} y = \sum_{i=1}^{m + n -1} ix_i + \sum_{i=1}^{m+n-1} iy_i
   \]
   However, at the same time:
   \[
   \sum_{(x, y) \in T} (x+y) = \sum_{i = m+1}^{2m + n - 1}id_i
   \]
   Thus:
   \[
   \sum_{i=1}^{m + n -1} ix_i + \sum_{i=1}^{m+n-1} iy_i = \sum_{i = m+1}^{2m + n - 1}id_i
   \]
   Now, we also have that \( d_i, x_i, y_i \) are odd for all \( i \). Thus:
   \[
   2 \sum_{i = 1}^{m+n-1} i \equiv  \sum_{i = m+1}^{2m + n - 1}id_i \pmod 2 
   \]
   Simplifying further:
   \[
   \frac{(3m+n)(m + n -1)}{2} \equiv 0 \pmod 2 
   \]
   This implies:
   \[
   4|(n - m)(m + n -1)
   \]
   Now, \( n-m \) and \( n+ m-1 \) are of opposite parity. Thus, this means that we must have either \( n - m \equiv 0 \pmod 4 \) or \( n + m = 1 \pmod 4 \).

2. **Construction**

   Without loss of generality, assume that \( m \le n \) (otherwise, reflect the set across the line \( x + y = m + n \)).

   We first prove that if \( n = 1 \) and \( n \equiv 0, 1 \pmod 4 \), then the constraint is satisfied. If \( n = 0, 1 \), then just consider the empty set and the single vertex \( (1, 1) \) respectively. Henceforth assume \( n \ge 4 \).

   Indeed, if \( n \equiv 1 \pmod 4 \), then consider the set:
   \[
   T = \{(1, 1), (1, 2), \ldots, (1, n)\} \cup \{(1, (n+1)/2), (2, (n+1)/2 - 1), \ldots, ((n+1)/2, 1)\} \cup \{((n+3)/2, (n-1)/2), ((n+5)/2, (n-3)/2), \ldots, (n, 1)\}
   \]
   Clearly, any vertical line other than \( x = 0 \) intersects \( T \) at only 1 point. On the other hand, \( x = 0 \) intersects \( T \) at \( n \) points.

   Also, if \( 1 \le i \le (n-1)/2 \), then \( y = i \) intersects \( T \) at 3 points, while if \( (m+1)/2 \le i \le n \), then \( y=i \) intersects \( T \) at 1 point.

   Furthermore, if \( 1 \le i \le n+1 \) and \( i \ne (n+3)/2, (n+1) \), then \( x + y = i \) intersects \( T \) at only one point. If \( i \in \{(n+3)/2, n+1\} \), then \( x+ y = i \) intersects \( T \) at \( (n+1)/2 \) points (which is clearly an odd number).

   On the other hand, if \( n \equiv 0 \pmod 4 \), then consider the set:
   \[
   S = \{(1, 1), (1, 2), (1, 4), \ldots, (1, n)\} \cup \{(2, n-1), (4, n-3), \ldots, (n, 1)\} \cup \{(n-1, 1), (n-3, 1), \ldots, (1, 1)\}
   \]
   Clearly, \( x = 1 \) intersects with \( n/2 + 1 \) elements of \( T \), while all other vertical lines intersect with 1 element of \( T \).

   Meanwhile, \( y = 1 \) intersects with \( n/2 + 1 \) elements of \( T \), while all other horizontal lines intersect with 1 element of \( T \).

   Finally, \( x + y = i \) intersects with 1 element of \( T \) for all \( i < n + 1 \). Meanwhile, \( x + y = n+1 \) intersects with \( n/2 + 1 \) elements of \( T \).

   Since \( n/2 + 1 \) is odd, \( T \) satisfies the condition.

   Now, we tackle the main problem. Let \( S_{m, n} \) denote the set \( S \) for a given value of \( m, n \). We claim that we can always find a working \( T \) if \( (m, n) = (0, 0), (1, 1), (2, 2), (3, 3), (0, 1), (1, 0), (2, 3), (3, 2) \pmod 4 \). This is equivalent to the condition \( m- n \equiv 0 \pmod 4 \) or \( m+ n \equiv 1 \pmod 4 \).

   - **Case 1: \( m \) is even (i.e., \( (m, n) = (0, 1), (0, 0), (2, 2), (2, 3) \pmod 4 \))**

     Consider the set \( S' \) of points in \( S_{m, n} \) that satisfy: \( m \le x, m \le y, x + y \le  m+n - 1 \). Note that this set is \( S_{1, n - m} \) translated up by \( n - m -1 \). Let \( T' \) be a subset of this set such that each of the lines parallel to either \( x = 0, y = 0, \) or \( x+y = 0 \) that intersects \( S' \) at an odd number of points (which exists since in all these cases, \( n - m \equiv 0, 1 \pmod 4 \)).

     Now, consider the set 
     \[
     T = T' \cup \{(1, m+n-1), (2, m+n-2), \ldots, (m, n)\} \cup \{ (m,1), (m, 2), \ldots, (m , m-1)\} \cup \{(n, m), (n + 1, m), \ldots, (n + m - 1, m)\}
     \]

     Conceptually, \( T \) is the union of \( T' \), the left "half" of the lowest vertical line that intersects \( T' \), the bottom "half" of the leftmost horizontal line that intersects \( T' \), and the top "half" of the lowest diagonal that lies strictly above \( T' \) (by "halves" here, we mean closed rays created by the intersection of the lines with the set \( m \le x, m \le y, x + y \le m+n \), which is \( S \) with an extra diagonal).

     For \( 1 \le i < m \), the line \( x= i \) intersects \( T \) at one point \( (i, m+n - i) \). The line \( x = m \) intersects \( T' \) at an odd number of points, while passing through an additional \( 1 + m-1 = m \) points of \( T \). For \( m < i <n \), the line \( x = i \) intersects \( T \) at an odd number of points. Finally, for \( n \le i \le m+n-1 \), the line \( x = i \) intersects \( T \) only at \( (i, m) \). Thus, every vertical line that intersects \( S \) also intersects \( T \) at an odd number of points.

     For \( 1 \le i < m \), the line \( y = i \) intersects \( T \) at one point \( (m, i) \). The line \( y = m \) intersects \( T' \) at an odd number of points, while passing through an additional \( m-1 \) points of \( T \). For \( m < i < n \), the line \( y = i \) intersects \( T \) at an odd number of points. Finally, for \( n \le i \le m+n-1 \), the line \( y = i \) intersects \( T \) only at \( (m + n - i , i) \). Thus, every horizontal line that intersects \( S \) also intersects \( T \) at an odd number of points.

     For \( m+1 \le i \le 2m-1 \), the line \( x + y = i \) intersects \( T \) at one point \( (m, i -m) \). For \( 2m \le i \le m + n-1 \), \( x + y = i \) intersects \( T \) at an odd number of points by the assumption on \( T' \). For \( i = m+n \), \( x + y = i \) intersects \( T \) at \( m +1 \) points. Finally, for \( m+n \le i \le 2m + n -1 \), \( x+ y = i \) intersects \( T \) only at \( (i - m, m) \). As a result, every diagonal line intersects \( T \) at an odd number of points.

   - **Case 2: \( m \) is odd (i.e., \( (m, n) = (1, 1), (3, 3), (3, 2), (1, 0) \pmod 4 \))**

     Consider the set \( S' \) of points in \( S_{m, n} \) that satisfy: \( m \le x, m \le y, x + y \le m+n \). Note that this set is a translated copy of \( S_{1, n - m+1} \). Let \( T' \) be a subset of this set such that each of the lines parallel to either \( x = 0, y = 0, \) or \( x+y = 0 \) that intersects \( S' \) at an odd number of points (which exists since in all these cases, \( n - m + 1 \equiv 0, 1 \pmod 4 \)).

     Now, consider the set 
     \[
     T = T' \cup \{(1, m+n-1), (2, m+n-2), \ldots, (m-1, n)\} \cup \{ (m,1), (m, 2), \ldots, (m , m-1)\} \cup \{(n+1, m), (n + 1, m), \ldots, (n + m - 1, m)\}
     \]

     Conceptually, \( T \) is the union of \( T' \), the left "half" of the lowest vertical line that intersects \( T' \), the bottom "half" of the leftmost horizontal line that intersects \( T' \), and the top "half" of the highest diagonal that intersects \( T' \) (by "halves" here, we mean open rays created by the intersection of the lines with \( S \)).

     For \( 1 \le i < m \), the line \( x= i \) intersects \( T \) at one point \( (i, m+n - i) \). The line \( x = m \) intersects \( T' \) at an odd number of points, while passing through an additional \( m-1 \) points of \( T \). For \( m < i \le n \), the line \( x = i \) intersects \( T \) at an odd number of points. Finally, for \( i > n \), the line \( x = i \) intersects \( T \) only at \( (i, m) \). Thus, every vertical line that intersects \( S \) also intersects \( T \) at an odd number of points.

     For \( 1 \le i < m \), the line \( y = i \) intersects \( T \) at one point \( (m, i) \). The line \( y = m \) intersects \( T' \) at an odd number of points, while passing through an additional \( m-1 \) points of \( T \). For \( m < i \le n \), the line \( y = i \) intersects \( T \) at an odd number of points. Finally, for \( i > n \), the line \( y = i \) intersects \( T \) only at \( (m + n - i, i) \). Thus, every horizontal line that intersects \( S \) also intersects \( T \) at an odd number of points.

     For \( m+1 \le i \le 2m-1 \), the line \( x + y = i \) intersects \( T \) at one point \( (m, i -m) \). For \( 2m \le i \le m + n-1 \), \( x + y = i \) intersects \( T \) at an odd number of points by the assumption on \( T' \). For \( i = m+n \), \( x + y = i \) intersects \( T' \) at an odd number of points while also intersecting \( T \) at an additional \( m-1 \) points (which is, in total, an odd number of intersections). Finally, for \( m+n \le i \le 2m + n -1 \), \( x+ y = i \) intersects \( T \) only at \( (i - m, m) \). As a result, every diagonal line intersects \( T \) at an odd number of points.

This finishes our construction. Thus, the answer is \( \boxed{n + m \equiv 1 \pmod 4 \text{ OR } n - m \equiv 0 \pmod 4} \) as desired.