foo.cc: In function 'int main()':
foo.cc:7:17: warning: unused variable 'j' [-Wunused-variable]
    7 |     int n,m,l,i,j,tot,top;
      |                 ^
foo.cc:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
foo.cc:9:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |     for(i=1;i<=n;i++)scanf("%d",&a[i]);
      |                      ~~~~~^~~~~~~~~~~~

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