This will reinforce dependent and manipulative behavior and decrease independent problem-solution. The best reinforcers are a surprise. Start again Learning to problem-solving, and listening to our children to help them, is a process. It can't be done once and then left alone. It must be done over and over again.
Repetition is a fundamental principle of learning.
The more you do something the better you get at it. And now that the child has found a solution to a problem, plan for the next one. Most problems pop up again in life. Brainstorm solutions for the next time. And finally, treat every problem as an experiment where new and clever solutions can be tested.