/in/foo.cc: In function 'int main()':
/in/foo.cc:12:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(f[a[i]]==1)
   ^~
/in/foo.cc:14:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    f[a[i]]=1;
    ^