View Compilation Error

0_0_25463380_23196.cpp: In function 'int main()':
0_0_25463380_23196.cpp:54:13: error: expected ';' before ':' token
         RAND:
             ^
0_0_25463380_23196.cpp:55:36: error: 'n' was not declared in this scope
         int n,a[100010] = {0};cin>>n;
                                    ^
0_0_25463380_23196.cpp:58:25: error: 'a' was not declared in this scope
             scanf("%X",&a[i]);
                         ^
0_0_25463380_23196.cpp:66:21: error: 'a' was not declared in this scope
             int x = a[A]^a[B];
                     ^