View Compilation Error

0_0_33146987_671.cpp: In function 'int main()':
0_0_33146987_671.cpp:73:29: error: 'build' was not declared in this scope
         build(T[0], 1, n + 1);
                             ^
0_0_33146987_671.cpp:77:50: error: 'update' was not declared in this scope
             update(T[i], 1, n + 1, T[i - 1], a[i]);
                                                  ^
0_0_33146987_671.cpp:79:47: error: 'update' was not declared in this scope
         update(T[n + 1], 1, n + 1, T[n], n + 1);
                                               ^
0_0_33146987_671.cpp:99:54: error: 'query' was not declared in this scope
                     query(T[x], T[n + 1], 1, n + 1, y);
                                                      ^
0_0_33146987_671.cpp:105:54: error: 'query' was not declared in this scope
                     query(T[x], T[n + 1], 1, n + 1, y);
                                                      ^