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* Compute an assignment of columns -> rows (and vice versa) such that every
* column is assigned to at most one row (and vice versa) minimizing the
* overall cost.
* The parameter `cost` is the cost matrix: the cost to assign column j to row
* i is `cost[j + column_count * i].
* The arrays column2row and row2column will be populated with the respective
* assignments (-1 for unassigned, which can happen only if column_count !=
* row_count).
void compute_assignment(int column_count, int row_count, int *cost,
int *column2row, int *row2column);
/* The maximal cost in the cost matrix (to prevent integer overflows). */
#define COST_MAX (1<<16)