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extern void change_signal(int crossroad_id, int signal);
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static const int MAXN = 1000;
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static const int MAXM = 1000;
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struct Vehicle
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{
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    int x, y, dir, dest_y, dest_x;
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};
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void init(int N, int map[][MAXM], int crossroad_id[][MAXM], Vehicle vehicles[MAXN]) 
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{
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    // Implement this function
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}
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bool process()
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{
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    // Implement this function
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    return false;
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}