foo.cpp: In function 'lint inv(lint)':
foo.cpp:53:16: error: 'lint inv(lint)' redeclared as different kind of symbol
 lint inv(lint t){
                ^
foo.cpp:39:6: error: previous declaration of 'lint inv [3000000]'
 lint inv[3000000];
      ^
foo.cpp: In function 'lint C(lint, lint)':
foo.cpp:70:19: error: 'inv' cannot be used as a function
     ans *= inv(div);
                   ^