foo.cc: In function 'int main()':
foo.cc:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:9:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |      scanf("%d%d%d",&t,&k,&l);
      |      ~~~~~^~~~~~~~~~~~~~~~~~~

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