foo.cc:9:25: warning: extra tokens at end of #include directive
 #include <bits/stdc++.h>　
                         ^
foo.cc: In function 'int main()':
foo.cc:39:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0; i<s.size(); i++)
           ~^~~~~~~~~
foo.cc:30:6: warning: unused variable 'cnt' [-Wunused-variable]
  int cnt=0, a[100005];
      ^~~

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