View Compilation Error

0_0_28781612_7201.cpp: In function 'void add(int, int, int, int)':
0_0_28781612_7201.cpp:42:20: error: too few arguments to function 'void add(int, int, int, int)'
         add(v,u,val);
                    ^
0_0_28781612_7201.cpp:32:6: note: declared here
 void add(int u,int fa,int val,int flag)
      ^