foo.cc: In function 'int main()':
foo.cc:7:17: warning: unused variable 'k' [-Wunused-variable]
    7 |     int n,m,i,j,k,o;
      |                 ^
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%d",&o,&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~

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