src/misc/espresso/solution.c

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/*
 * Revision Control Information
 *
 * $Source$
 * $Author$
 * $Revision$
 * $Date$
 *
 */
#include "mincov_int.h"


solution_t *
solution_alloc()
{
    solution_t *sol;

    sol = ALLOC(solution_t, 1);
    sol->cost = 0;
    sol->row = sm_row_alloc();
    return sol;
}


void
solution_free(sol)
solution_t *sol;
{
    sm_row_free(sol->row);
    FREE(sol);
}


solution_t *
solution_dup(sol)
solution_t *sol;
{
    solution_t *new_sol;

    new_sol = ALLOC(solution_t, 1);
    new_sol->cost = sol->cost;
    new_sol->row = sm_row_dup(sol->row);
    return new_sol;
}


void 
solution_add(sol, weight, col)
solution_t *sol;
int *weight;
int col;
{
    (void) sm_row_insert(sol->row, col);
    sol->cost += WEIGHT(weight, col);
}


void 
solution_accept(sol, A, weight, col)
solution_t *sol;
sm_matrix *A;
int *weight;
int col;
{
    register sm_element *p, *pnext;
    sm_col *pcol;

    solution_add(sol, weight, col);

    /* delete rows covered by this column */
    pcol = sm_get_col(A, col);
    for(p = pcol->first_row; p != 0; p = pnext) {
        pnext = p->next_row;            /* grab it before it disappears */
        sm_delrow(A, p->row_num);
    }
}


/* ARGSUSED */
void 
solution_reject(sol, A, weight, col)
solution_t *sol;
sm_matrix *A;
int *weight;
int col;
{
    sm_delcol(A, col);
}


solution_t *
solution_choose_best(best1, best2)
solution_t *best1, *best2;
{
    if (best1 != NIL(solution_t)) {
        if (best2 != NIL(solution_t)) {
            if (best1->cost <= best2->cost) {
                solution_free(best2);
                return best1;
            } else {
                solution_free(best1);
                return best2;
            }
        } else {
            return best1;
        }
    } else {
        if (best2 != NIL(solution_t)) {
            return best2;
        } else {
            return NIL(solution_t);
        }
    }
}

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