/in/foo.cc: In function 'int main()':
/in/foo.cc:150:24: error: 'memset' was not declared in this scope
 memset(lt,-1,sizeof(lt));
                        ^
/in/foo.cc:147:15: warning: unused variable 't' [-Wunused-variable]
 int b,i,q,x,y,t=clock();
               ^