Min_Heap

struct nod {
    int x , y, c;
    bool operator < (const nod &A) const {
        return c > A.c;
    }
}xx;

priority_queue < nod > Q;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
struct fcmp {
    bool operator () (int x, int y) {
        return D[x] > D[y];
    }
};

priority_queue < int, vector < int >, fcmp > Q;