foo.cc: In function 'int main()':
foo.cc:11:19: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'int*' [-Wformat=]
 scanf("%s",a[b[j]]);
                   ^
foo.cc:14:19: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'int*' [-Wformat=]
 printf("%s\n",a[j]);
                   ^
foo.cc:5:11: warning: unused variable 'k' [-Wunused-variable]
 int i=0,j,k;
           ^
foo.cc:8:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&b[i++]);
 ~~~~~^~~~~~~~~~~~~~
foo.cc:11:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%s",a[b[j]]);
 ~~~~~^~~~~~~~~~~~~~

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