View Compilation Error

0_0_20911216_18395.cpp: In function 'int main()':
0_0_20911216_18395.cpp:71:16: error: 'MS' was not declared in this scope
         MS(f, 0);  
                ^
0_0_20911216_18395.cpp:89:55: error: 'gmax' was not declared in this scope
                     gmax(ans, dep[LCA(a[i], b[j - 1])]);  
                                                       ^
0_0_20911216_18395.cpp:91:47: error: 'gmax' was not declared in this scope
                 gmax(ans, dep[LCA(a[i], b[j])]);  
                                               ^