View Compilation Error

0_0_31060450_20948.cpp: In function 'void work()':
0_0_31060450_20948.cpp:120:19: error: too few arguments to function 'void ad(int, int, int)'
   ad(tag[u],tag[v]);
                   ^
0_0_31060450_20948.cpp:68:6: note: declared here
 void ad(int x,int v,int w)
      ^
0_0_31060450_20948.cpp:121:19: error: too few arguments to function 'void ad(int, int, int)'
   ad(tag[v],tag[u]);
                   ^
0_0_31060450_20948.cpp:68:6: note: declared here
 void ad(int x,int v,int w)
      ^