foo.cc: In function 'int main()':
foo.cc:33:10: warning: 'w' may be used uninitialized [-Wmaybe-uninitialized]
   33 |     for(i=w-1;i>0;i--)
      |         ~^~~~
foo.cc:15:15: note: 'w' was declared here
   15 |     int n,b,i,w,now,sum=0;
      |               ^

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