There are three types of piece shown as below. Today Alice wants to cover a $100 \times 101$ board with these pieces without gaps and overlaps. Determine the minimum number of $1\times 1$ pieces should be used to cover the whole board and not exceed the board. (There are an infinite number of these three types of pieces.)
[asy]
size(9cm,0);
defaultpen(fontsize(12pt));
draw((9,10) -- (59,10) -- (59,60) -- (9,60) -- cycle);
draw((59,10) -- (109,10) -- (109,60) -- (59,60) -- cycle);
draw((9,60) -- (59,60) -- (59,110) -- (9,110) -- cycle);
draw((9,110) -- (59,110) -- (59,160) -- (9,160) -- cycle);
draw((109,10) -- (159,10) -- (159,60) -- (109,60) -- cycle);
draw((180,11) -- (230,11) -- (230,61) -- (180,61) -- cycle);
draw((180,61) -- (230,61) -- (230,111) -- (180,111) -- cycle);
draw((230,11) -- (280,11) -- (280,61) -- (230,61) -- cycle);
draw((230,61) -- (280,61) -- (280,111) -- (230,111) -- cycle);
draw((280,11) -- (330,11) -- (330,61) -- (280,61) -- cycle);
draw((280,61) -- (330,61) -- (330,111) -- (280,111) -- cycle);
draw((330,11) -- (380,11) -- (380,61) -- (330,61) -- cycle);
draw((330,61) -- (380,61) -- (380,111) -- (330,111) -- cycle);
draw((401,11) -- (451,11) -- (451,61) -- (401,61) -- cycle);
[/asy]
[i]Proposed by amano_hina[/i]
1. **Assume we can cover the board without using any $1 \times 1$ pieces.**

   Consider a coloring of the $100 \times 101$ board where the first row is black, the second row is white, and so on, alternating colors. This results in the first and last rows being black.

2. **Count the number of black and white cells:**

   - There are $100$ rows and $101$ columns.
   - Each row has $101$ cells.
   - Since the rows alternate in color, half of the rows (50 rows) will start with black and end with black, and the other half (50 rows) will start with white and end with white.
   - Therefore, the number of black cells in each row is $51$ for the rows starting with black and $50$ for the rows starting with white.
   - Total number of black cells: $50 \times 51 + 50 \times 50 = 2550 + 2500 = 5050$.
   - Total number of white cells: $50 \times 50 + 50 \times 51 = 2500 + 2550 = 5050$.

3. **Analyze the pieces:**

   - Type I pieces cover $5$ cells, with $4$ cells of one color and $1$ cell of the other color.
   - Type II pieces cover $5$ cells, with $3$ cells of one color and $2$ cells of the other color.
   - Type III pieces cover $5$ cells, with $3$ cells of one color and $2$ cells of the other color.

   Each piece of type I, II, or III will always cover an odd number of cells of one color and an even number of cells of the other color. This means the difference between the number of black and white cells covered by these pieces is always a multiple of $3$.

4. **Check the condition for covering the board:**

   - The total number of cells is $100 \times 101 = 10100$.
   - Since the board is evenly colored, the difference between the number of black and white cells is $0$.
   - If we use only type I, II, or III pieces, the difference between the number of black and white cells covered will be a multiple of $3$.
   - However, $5050 - 5050 = 0$ is not a multiple of $3$.

   Therefore, it is impossible to cover the board without using any $1 \times 1$ pieces.

5. **Consider using one $1 \times 1$ piece:**

   - If we use one $1 \times 1$ piece, it will cover either a black or a white cell.
   - This will change the difference between the number of black and white cells by $\pm 1$.
   - The difference will then be $\pm 1$, which is still not a multiple of $3$.

   Therefore, it is impossible to cover the board using only one $1 \times 1$ piece.

6. **Consider using two $1 \times 1$ pieces:**

   - If we use two $1 \times 1$ pieces, they can cover one black and one white cell.
   - This will not change the difference between the number of black and white cells, which remains $0$.
   - The remaining cells can be covered using type I, II, or III pieces, as the difference between the number of black and white cells covered by these pieces is a multiple of $3$.

   Therefore, it is possible to cover the board using two $1 \times 1$ pieces.

The final answer is $\boxed{2}$.