View Compilation Error

0_0_25470588_2002.cpp: In function 'int main()':
0_0_25470588_2002.cpp:50:16: error: invalid initialization of reference of type 'int&' from expression of type 'long long int'
   msort(ans,1,n);
                ^
0_0_25470588_2002.cpp:5:6: note: in passing argument 1 of 'void msort(int&, int, int)'
 void msort(int &ans,int l,int r)
      ^