foo.cc: In function 'int main()':
foo.cc:7:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |         for(int i=1;i<s.size() ;i++)
      |                     ~^~~~~~~~~
foo.cc:21:26: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations]
   21 |                 if(a[1][i]>m)
      |                    ~~~~~~^
foo.cc:19:22: note: within this loop
   19 |         for(int i=0;i<=1000000;i++)
      |                     ~^~~~~~~~~
foo.cc:29:26: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations]
   29 |                 if(a[1][i]==m)
      |                    ~~~~~~^
foo.cc:27:22: note: within this loop
   27 |         for(int i=0;i<=1000000;i++)
      |                     ~^~~~~~~~~

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