/in/foo.c: In function 'main':
/in/foo.c:41:5: error: 'pos' undeclared (first use in this function)
     pos=t;
     ^~~
/in/foo.c:41:5: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:7:21: warning: unused variable 'flag1' [-Wunused-variable]
  int max,i,j,flag=0,flag1=0,t,m;
                     ^~~~~