51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
#!/usr/bin/env python3
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# Copyright 2010-2024 Google LLC
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Code sample to demonstrates how to build an optional interval."""
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from ortools.sat.python import cp_model
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def optional_interval_sample_sat():
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"""Showcases how to build optional interval variables."""
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model = cp_model.CpModel()
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horizon = 100
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# An interval can be created from three affine expressions.
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start_var = model.new_int_var(0, horizon, "start")
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duration = 10 # Python cp/sat code accept integer variables or constants.
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end_var = model.new_int_var(0, horizon, "end")
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presence_var = model.new_bool_var("presence")
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interval_var = model.new_optional_interval_var(
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start_var, duration, end_var + 2, presence_var, "interval"
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)
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print(f"interval = {repr(interval_var)}")
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# If the size is fixed, a simpler version uses the start expression and the
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# size.
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fixed_size_interval_var = model.new_optional_fixed_size_interval_var(
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start_var, 10, presence_var, "fixed_size_interval_var"
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)
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print(f"fixed_size_interval_var = {repr(fixed_size_interval_var)}")
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# A fixed interval can be created using the same API.
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fixed_interval = model.new_optional_fixed_size_interval_var(
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5, 10, presence_var, "fixed_interval"
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)
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print(f"fixed_interval = {repr(fixed_interval)}")
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optional_interval_sample_sat()
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