foo.cc: In function 'int main()':
foo.cc:6:13: warning: variable 'max_n' set but not used [-Wunused-but-set-variable]
    6 |         int max_n,min_n;
      |             ^~~~~
foo.cc:6:19: warning: variable 'min_n' set but not used [-Wunused-but-set-variable]
    6 |         int max_n,min_n;
      |                   ^~~~~

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