operations_research::KnapsackMIPSolver Class Reference

--— KnapsackMIPSolver --— More...

Inheritance diagram for operations_research::KnapsackMIPSolver:

Public Member Functions
	KnapsackMIPSolver (MPSolver::OptimizationProblemType problem_type, absl::string_view solver_name)
void	Init (const std::vector< int64_t > &profits, const std::vector< std::vector< int64_t > > &weights, const std::vector< int64_t > &capacities) override
	Initializes the solver and enters the problem to be solved.
int64_t	Solve (TimeLimit *time_limit, double time_limit_in_second, bool *is_solution_optimal) override
	Solves the problem and returns the profit of the optimal solution.
bool	best_solution (int item_id) const override
	Returns true if the item 'item_id' is packed in the optimal knapsack.
Public Member Functions inherited from operations_research::BaseKnapsackSolver
	BaseKnapsackSolver (absl::string_view solver_name)
virtual	~BaseKnapsackSolver ()=default
virtual void	GetLowerAndUpperBoundWhenItem (int item_id, bool is_item_in, int64_t *lower_bound, int64_t *upper_bound)
	--— BaseKnapsackSolver --—
virtual std::string	GetName () const

Detailed Description

--— KnapsackMIPSolver --—

Definition at line 1184 of file knapsack_solver.cc.

Constructor & Destructor Documentation

KnapsackMIPSolver()

operations_research::KnapsackMIPSolver::KnapsackMIPSolver	(	MPSolver::OptimizationProblemType	problem_type,
		absl::string_view	solver_name )

Definition at line 1211 of file knapsack_solver.cc.

Member Function Documentation

best_solution()

bool operations_research::KnapsackMIPSolver::best_solution ( int item_id ) const

inlineoverridevirtual

Returns true if the item 'item_id' is packed in the optimal knapsack.

Implements operations_research::BaseKnapsackSolver.

Definition at line 1199 of file knapsack_solver.cc.

Init()

void operations_research::KnapsackMIPSolver::Init ( const std::vector< int64_t > & profits, const std::vector< std::vector< int64_t > > & weights, const std::vector< int64_t > & capacities )

overridevirtual

Initializes the solver and enters the problem to be solved.

Implements operations_research::BaseKnapsackSolver.

Definition at line 1221 of file knapsack_solver.cc.

Solve()

int64_t operations_research::KnapsackMIPSolver::Solve ( TimeLimit * time_limit, double time_limit_in_second, bool * is_solution_optimal )

overridevirtual

Solves the problem and returns the profit of the optimal solution.

Add constraints.

Define objective to minimize. Minimization is used instead of maximization because of an issue with CBC solver which does not always find the optimal solution on maximization problems.

Store best solution.

Implements operations_research::BaseKnapsackSolver.

Definition at line 1229 of file knapsack_solver.cc.

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The documentation for this class was generated from the following file:

• ortools/algorithms/knapsack_solver.cc