/in/foo.c: In function 'main':
/in/foo.c:8:4: error: 'new' undeclared (first use in this function)
  a=new int[n];
    ^~~
/in/foo.c:8:4: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:8:8: error: expected ';' before 'int'
  a=new int[n];
        ^~~
/in/foo.c:9:10: warning: unused variable 'j' [-Wunused-variable]
  int i=0,j=0,t=0;
          ^