View Compilation Error

0_0_30481754_4680.cpp: In function 'void dfs(int, int, int)':
0_0_30481754_4680.cpp:49:38: error: too few arguments to function 'void dfs(int, int, int)'
                  dfs(b, l + sz[b] - 1);
                                      ^
0_0_30481754_4680.cpp:29:6: note: declared here
 void dfs(int rt, int l, int r) {
      ^