Did a few technical posts on CodeForces a couple of years back on some competitive programming techniques. Here are the links:
- Tutorial on FFT/NTT — The tough made simple.(Part 1)
- Tutorial on FFT/NTT — The tough made simple.(Part 2)
- Tutorial on Zeta Transform, Mobius Transform and Subset Sum Convolution
Aggregating them here to keep all my posts in one place.