View Compilation Error

0_0_28214158_28419.cpp:70:1: error: expected ';' after class definition
 }
 ^
0_0_28214158_28419.cpp: In function 'int main()':
0_0_28214158_28419.cpp:73:8: error: 'a' was not declared in this scope
        a.build(1,1,n);
        ^