View Compilation Error

0_0_29118150_9486.cpp: In function 'bool twosat(int)':
0_0_29118150_9486.cpp:22:25: error: 'memwset' was not declared in this scope
     memwset(v,0,sizeof v);
                         ^
0_0_29118150_9486.cpp:29:41: error: expected ']' before ';' token
             while(top) v[st[--top]=false;
                                         ^
0_0_29118150_9486.cpp: In function 'int main()':
0_0_29118150_9486.cpp:51:24: error: expected primary-expression before ')' token
         if(twosat(2*n)))
                        ^