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inertia.c

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    char *err, *soln, *p;

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    /*

 

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     * Before anything else, deal with the special case in which

 

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     * all the gems are already collected.

 

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     */

 

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    for (i = 0; i < wh; i++)

 

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        if (currstate->grid[i] == GEM)

 

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            break;

 

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    if (i == wh) {

 

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        *error = "Game is already solved";

 

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        return NULL;

 

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    }

 

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    /*

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     * Solving Inertia is a question of first building up the graph

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     * of where you can get to from where, and secondly finding a

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     * tour of the graph which takes in every gem.

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