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reified_sample_sat¶

Run in Google Colab

View source on GitHub

First, you must install ortools package in this colab.

In [ ]:

%pip install ortools

Simple model with a reified constraint.

In [ ]:

from ortools.sat.python import cp_model


def reified_sample_sat():
    """Showcase creating a reified constraint."""
    model = cp_model.CpModel()

    x = model.new_bool_var("x")
    y = model.new_bool_var("y")
    b = model.new_bool_var("b")

    # First version using a half-reified bool and.
    model.add_bool_and(x, ~y).only_enforce_if(b)

    # Second version using implications.
    model.add_implication(b, x)
    model.add_implication(b, ~y)

    # Third version using bool or.
    model.add_bool_or(~b, x)
    model.add_bool_or(~b, ~y)


reified_sample_sat()