View Compilation Error

0_0_24626893_10958.cpp: In member function 'int TreeHash::getBarycentre()':
0_0_24626893_10958.cpp:75:41: error: 'v' was not declared in this scope
 maxSubtree[u] = max(maxSubtree[u], size[v]);
                                         ^
0_0_24626893_10958.cpp: At global scope:
0_0_24626893_10958.cpp:207:1: error: declaration of 'operator<' as non-function
 }
 ^
0_0_24626893_10958.cpp:207:1: error: expected ';' at end of member declaration
0_0_24626893_10958.cpp:207:1: error: expected '}' at end of input
0_0_24626893_10958.cpp:128:1: error: expected unqualified-id at end of input
 }
 ^