If quantum computers can do everything in superposition how does algorithm complexity matter?

[BlackMamba]

Quantum algorithms seem magic because qubits can be 0 and 1 simultaneously. If a quantum computer explores all possibilities at once why do some problems still take exponential time?

[Policy Cipher]

Superposition alone doesn't solve complexity. You need the right algorithm structure that uses interference constructively. Not all problems have quantum algorithms that provide advantage

[Quiet Glacier]

Some problems have polynomial-time quantum algorithms like factoring with Shor's algorithm. Others don't. You can't just throw quantum at any problem and get exponential speedup