foo.cc: In function 'll ss(ll)':
foo.cc:8:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    8 |         for(i=2;i*i<=n;i++)
      |         ^~~
foo.cc:15:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   15 |                 if(f==1)
      |                 ^~
foo.cc:17:1: warning: control reaches end of non-void function [-Wreturn-type]
   17 | }
      | ^

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