Restore the acute triangle $ABC$ given the vertex $A$, the foot of the altitude drawn from the vertex $B$ and the center of the circle circumscribed around triangle $BHC$ (point $H$ is the orthocenter of triangle $ABC$).
1. **Given Data and Initial Setup:**
   - We are given the vertex \( A \) of the triangle \( ABC \).
   - We are given the foot of the altitude from vertex \( B \) to side \( AC \), let's call this point \( D \).
   - We are given the center \( O \) of the circle circumscribed around triangle \( BHC \), where \( H \) is the orthocenter of triangle \( ABC \).

2. **Understanding the Nine-Point Circle:**
   - The nine-point circle of triangle \( BHC \) passes through the midpoints of the sides of \( BHC \), the feet of the altitudes of \( BHC \), and the midpoints of the segments joining the orthocenter \( H \) to the vertices \( B \) and \( C \).
   - The center of the nine-point circle is the midpoint of the segment joining the orthocenter \( H \) and the circumcenter \( O \) of triangle \( BHC \).

3. **Constructing the Nine-Point Circle:**
   - Let \( N \) be the midpoint of \( AO \). The nine-point circle of \( BHC \) is centered at \( N \) and passes through the foot of the \( C \)-altitude of \( BHC \).

4. **Using Homothety:**
   - Consider a homothety centered at \( A \) with a ratio of 2. This homothety maps the nine-point circle of \( BHC \) to the circumcircle of \( BHC \).

5. **Locating Point \( C \):**
   - The line joining \( A \) and the foot of the \( C \)-altitude of \( BHC \) intersects the circumcircle of \( BHC \) at two points. Since triangle \( ABC \) is acute, the intersection point farther from \( A \) is \( C \).

6. **Locating Point \( B \):**
   - Draw a line perpendicular to \( AC \) at the foot of the perpendicular from \( B \) (point \( D \)). This line intersects the circumcircle of \( BHC \) at two points.
   - One of these points is \( B \) and the other is \( H \). Since \( \angle BAC \) is acute, \( \angle BHC \) is obtuse. Therefore, the point corresponding to the obtuse angle in triangle \( BHC \) is \( H \), and the other point is \( B \).

7. **Conclusion:**
   - By identifying the correct points \( B \) and \( C \) using the properties of the acute triangle and the configuration of the circumcircle and nine-point circle, we can restore the triangle \( ABC \).

The final answer is the restored triangle \( \boxed{ ABC } \).