foo.cc:11:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning(disable:4996)
 
foo.cc: In function 'int main()':
foo.cc:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < s.length(); i++)
                   ~~^~~~~~~~~~~~
foo.cc:81:9: warning: unused variable 'u' [-Wunused-variable]
  ks:int u = 1;
         ^

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