View Compilation Error

0_0_33712579_15467.cpp: In function 'void Query(int, int)':
0_0_33712579_15467.cpp:173:50: error: invalid initialization of reference of type 'int&' from expression of type 'std::unordered_map<int, long long int>::mapped_type {aka long long int}'
    int g = __gcd(l[i].fst, r[j].fst), &cnt = mp[g];
                                                  ^