View Compilation Error

0_0_14817433_2270.cpp: In function 'int calc()':
0_0_14817433_2270.cpp:53:20: error: expected ')' before numeric constant
         add(sum,res.1ll * v[i] * i % mod);
                    ^
0_0_14817433_2270.cpp:53:41: error: invalid initialization of reference of type 'const int&' from expression of type 'Node'
         add(sum,res.1ll * v[i] * i % mod);
                                         ^
0_0_14817433_2270.cpp:19:6: note: in passing argument 2 of 'void add(int&, const int&)'
 void add(int &x,const int &y){
      ^