View Compilation Error

0_0_19743521_7782.cpp: In function 'int main()':
0_0_19743521_7782.cpp:22:40: error: expected primary-expression before ')' token
             memset(visited,false,sizeof);
                                        ^
0_0_19743521_7782.cpp:22:40: error: 'memset' was not declared in this scope