foo.cc: In function 'int main()':
foo.cc:6:12: warning: variable 'w1' set but not used [-Wunused-but-set-variable]
    6 |  int n,k=1,w1[1000],w2[1000];
      |            ^~
foo.cc:6:21: warning: variable 'w2' set but not used [-Wunused-but-set-variable]
    6 |  int n,k=1,w1[1000],w2[1000];
      |                     ^~

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