foo.cc: In function 'int main()':
foo.cc:10:5: warning: comparison of constant '86400' with boolean expression is always true [-Wbool-compare]
   10 | 1<=s<=86400;
      | ~~~~^~~~~~~
foo.cc:10:2: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   10 | 1<=s<=86400;
      | ~^~~
foo.cc:10:5: warning: statement has no effect [-Wunused-value]
   10 | 1<=s<=86400;
      | ~~~~^~~~~~~

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