View Compilation Error

0_0_30274509_12429.cpp: In function 'void dfs(long long int, long long int, long long int)':
0_0_30274509_12429.cpp:23:19: error: invalid initialization of reference of type 'long long int&' from expression of type 'int'
   long long& to=i.first,le=i.second; 
                   ^