Getting started with Constraint Programming [closed]

Looking for tips, tutorials, books and other resources to get started with Constraint Programming.

What are constraints in coding problems?

Constraints denote the lower and upper bound of the values of variables . Test cases are number of inputs which your algorithm will be tested against. eg - the max value in the linked problem of A and B will be 10^5 and min value would be 0.

What is meant by constraint programming?

Constraint optimization, or constraint programming (CP), is the name given to identifying feasible solutions out of a very large set of candidates, where the problem can be modeled in terms of arbitrary constraints. CP problems arise in many scientific and engineering disciplines.

There is a lot of excellent material available on the web once you get in the groove, but the links below are (IMO) good starting points (the ones I used).

Programming with Constraints: An Introduction - (Course website)
Programming with Constraints: An Introduction - (Google book)
Online Guide to Constraint Programming