/in/foo.cc: In function 'int main()':
/in/foo.cc:10:9: warning: comparison of constant '1000' with boolean expression is always true [-Wbool-compare]
  1 <= n <= 1000 & 2 <= k <= 100;
  ~~~~~~~^~~~~~~
/in/foo.cc:10:4: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  1 <= n <= 1000 & 2 <= k <= 100;
  ~~^~~~
/in/foo.cc:10:26: warning: comparison of constant '100' with boolean expression is always true [-Wbool-compare]
  1 <= n <= 1000 & 2 <= k <= 100;
                   ~~~~~~~^~~~~~
/in/foo.cc:10:21: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  1 <= n <= 1000 & 2 <= k <= 100;
                   ~~^~~~
/in/foo.cc:10:9: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  1 <= n <= 1000 & 2 <= k <= 100;
  ~~~~~~~^~~~~~~
/in/foo.cc:10:17: warning: statement has no effect [-Wunused-value]
  1 <= n <= 1000 & 2 <= k <= 100;
  ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~