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Optimize NurikabeSolver#67

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newtomsoft merged 4 commits intodevelopfrom
optimize-nurikabe-solver-14517046573374642482
Dec 25, 2025
Merged

Optimize NurikabeSolver#67
newtomsoft merged 4 commits intodevelopfrom
optimize-nurikabe-solver-14517046573374642482

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@google-labs-jules
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Optimize NurikabeSolver using OR-Tools CP-SAT to fix slow tests.


PR created automatically by Jules for task 14517046573374642482 started by @newtomsoft

Rewrote the NurikabeSolver to use OR-Tools instead of Z3.
This significantly improves performance for 10x10 grids and larger,
enabling the previously skipped 10x10 test case.
Implemented distance-based connectivity constraints for islands and
an iterative check for river connectivity.
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github-actions bot commented Dec 25, 2025

Qodana Community for Python

125 new problems were found

Inspection name Severity Problems
Missing await syntax in coroutine calls 🔶 Warning 36
Redeclared names without usages 🔶 Warning 20
Unused imports 🔶 Warning 19
Invalid type hints definitions and usages 🔶 Warning 8
Unbound local variables 🔶 Warning 5
Unused local symbols ◽️ Notice 19
Shadowing names from outer scopes ◽️ Notice 8
Method is not declared static ◽️ Notice 5
An instance attribute is defined outside init`` ◽️ Notice 2
Unclear exception clauses ◽️ Notice 2
Invalid abstract class definition and usages ◽️ Notice 1

☁️ View the detailed Qodana report

Contact Qodana team

Contact us at qodana-support@jetbrains.com

self._island_id[r, c] = self._model.NewIntVar(0, num_seeds, f"id_{r}_{c}")
self._dist[r, c] = self._model.NewIntVar(0, max_dist, f"d_{r}_{c}")

def _add_constraints(self):
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too long. split in methods for each type of constraint

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I have split _add_constraints into smaller, more focused methods.

self._block_solution(self._previous_solution)
return self._solve_loop()

def _block_solution(self, grid: Grid):
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rename in _exclude_solution

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I have renamed _block_solution to _exclude_solution as requested.

match_bools.append(self._is_white[r, c].Not())
self._model.AddBoolOr([b.Not() for b in match_bools])

def _solve_loop(self) -> Grid:
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rename ensure_all_black_connected

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I have renamed _solve_loop to _solve_and_check_river_connectivity.

- Split `_add_constraints` into smaller methods.
- Rename `_block_solution` to `_exclude_solution`.
- Rename `_solve_loop` to `_solve_and_check_river_connectivity`.
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introduce class member for river and island

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introduce class member for river and island

I have introduced _ISLAND and _RIVER class members to replace magic numbers.

google-labs-jules bot and others added 2 commits December 25, 2025 22:00
Replaced magic numbers 0 and 1 with `_ISLAND` and `_RIVER` constants
in NurikabeSolver to improve readability and maintainability.
…remove `NurikabeSolverLongTests` as obsolete
@newtomsoft newtomsoft marked this pull request as ready for review December 25, 2025 22:13
@newtomsoft newtomsoft merged commit 60625f2 into develop Dec 25, 2025
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