This is the seventieth fourth part of the ILP series. For your convenience you can find other parts in the table of contents in Part 1 – Boolean algebra We know how to calculate absolute value and how to compare real numbers. The original formula uses comparisons:     where should be an absolute value … Continue reading ILP Part 74 — Absolute value for real numbers

This is the seventieth third part of the ILP series. For your convenience you can find other parts in the table of contents in Part 1 – Boolean algebra Today we’re going to solve a matchstick puzzle. Move one stick to make the equality hold: which is 6 + 2 = 9. Solution is rather … Continue reading ILP Part 73 — Matchstick puzzle

This is the seventieth second part of the ILP series. For your convenience you can find other parts in the table of contents in Part 1 – Boolean algebra Today we’re going to solve self-descriptive numbers described in Delta article. Self-descriptive number is a number which “describes” itself: first digit denotes how many zeroes there … Continue reading ILP Part 72 — Self-descriptive numbers

This is the seventieth first part of the ILP series. For your convenience you can find other parts in the table of contents in Part 1 – Boolean algebra Let’s solve the Literówka problem. It’s almost a regular riddle with digits hidden behind letters but this time one letter in the final sum is incorrect. … Continue reading ILP Part 71 — Typo

This is the seventieth part of the ILP series. For your convenience you can find other parts in the table of contents in Part 1 – Boolean algebra Today we are solving the following problem: we have a set of elements with ranks (higher rank is better) and want to reorder them to maximize the … Continue reading ILP Part 70 — Elements reordering