foo.cc: In function 'int main()':
foo.cc:5:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |     scanf("%d %d",&m,&n);
      |     ~~~~~^~~~~~~~~~~~~~~
foo.cc:6:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |     for(i=1;i<=n;i++)scanf("%d",w+i);
      |                      ~~~~~^~~~~~~~~~

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