foo.cc:1:24: warning: extra tokens at end of #include directive
    1 | #include<bits/stdc++.h>#include<bits/stdc++.h>
      |                        ^
foo.cc: In function 'int main()':
foo.cc:8:20: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
    8 |                 y=y*10+x%10;
      |                   ~^~~

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