View Compilation Error

0_0_13632906_28219.cpp: In function 'int find_root(int)':
0_0_13632906_28219.cpp:31:8: error: 'node' was not declared in this scope
     if(node[c].root!=  c)
        ^
0_0_13632906_28219.cpp:33:12: error: 'node' was not declared in this scope
     return node[c].root;
            ^