/in/foo.cc: In function 'int main()':
/in/foo.cc:8:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    8 |         if(e<M<N)
      |            ~^~
/in/foo.cc:10:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   10 |         if(e<N<M)
      |            ~^~
/in/foo.cc:12:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   12 |         if(M<N<e)
      |            ~^~
/in/foo.cc:14:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   14 |         if(M<e<N)
      |            ~^~
/in/foo.cc:16:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   16 |         if(N<M<e)
      |            ~^~
/in/foo.cc:18:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   18 |         if(N<e<M)
      |            ~^~