foo.cc: In function 'int main()':
foo.cc:7:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,o;
        ^
foo.cc:7:10: warning: unused variable 'o' [-Wunused-variable]
  int i,j,o;
          ^
foo.cc:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&k);
  ~~~~~^~~~~~~~~~~~~~

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