What problem is worth time of Your life ?

A problem P can be defined as a situation or scenario where a particular system, device, or process is not performing as desired, leading to suboptimal or undesired outcomes. In a design & engineering context, P is typically framed in terms of:

Vector of Parameters: This is a set of variables or conditions that characterize the system or scenario. They can be input conditions, system states, or any other relevant metrics that describe the system. 

Objective Function: This is a mathematical function that quantifies how far the current system's performance is from the desired performance. The goal is usually to minimize or maximize this function. 

Constraints: These are the bounds or limitations within which the system operates. In engineering problems, constraints can arise from physical limitations, safety requirements, budgetary restrictions, etc. The solution must satisfy these constraints.