foo.c: In function 'main':
foo.c:11:14: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
   scanf("%d %d",&b[i],c[i]);
              ^
foo.c:11:14: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
foo.c:24:7: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
    ans=ans+1;
    ~~~^~~~~~