View Compilation Error

0_0_33591454_9004.cpp: In function 'int main()':
0_0_33591454_9004.cpp:73:44: error: 'update' was not declared in this scope
             update(root[i][j],1,n2,va[i][j]);
                                            ^
0_0_33591454_9004.cpp:83:44: error: 'update' was not declared in this scope
             update(head[i][j],1,n2,va[i][j]);
                                            ^