Let $n$ be positive integer and $S$= {$0,1,…,n$}, Define set of point in the plane. $$A = \{(x,y) \in S \times S \mid -1 \leq x-y \leq 1 \} $$, We want to place a electricity post on a point in $A$ such that each electricity post can shine in radius 1.01 unit. Define minimum number of electricity post such that every point in $A$ is in shine area
To solve this problem, we need to determine the minimum number of electricity posts required to cover all points in the set \( A \) such that each post can shine in a radius of 1.01 units. We will use induction to prove that the minimum number of posts required is \( n+1 \).

1. **Base Case:**
   For \( n = 1 \), the set \( S = \{0, 1\} \). The set \( A \) is:
   \[
   A = \{(x, y) \in S \times S \mid -1 \leq x - y \leq 1\}
   \]
   This gives us the points \( (0,0), (0,1), (1,0), (1,1) \). We can cover all these points with 2 posts, one at \( (0,0) \) and one at \( (1,1) \). Thus, the base case holds as \( n+1 = 2 \).

2. **Inductive Step:**
   Assume that for \( n = k \), the minimum number of posts required to cover all points in \( A_k \) is \( k+1 \). We need to show that for \( n = k+1 \), the minimum number of posts required is \( (k+1) + 1 = k+2 \).

   Consider the set \( A_{k+1} \). We can place a post at \( (k+1, k+1) \). This post will cover the points:
   \[
   (k+1, k+1), (k+1, k), (k, k+1)
   \]
   However, the points in \( A_k \) (i.e., the points in the set when \( n = k \)) are not fully covered by this single post. By the induction hypothesis, we need \( k+1 \) posts to cover all points in \( A_k \).

   Therefore, to cover all points in \( A_{k+1} \), we need \( k+1 \) posts to cover \( A_k \) plus one additional post to cover the new points introduced by increasing \( n \) to \( k+1 \). This gives us a total of \( (k+1) + 1 = k+2 \) posts.

3. **Conclusion:**
   By induction, we have shown that for any positive integer \( n \), the minimum number of electricity posts required to cover all points in \( A \) is \( n+1 \).

\(\blacksquare\)

The final answer is \( \boxed{ n+1 } \).