foo.cc: In function 'int main()':
foo.cc:76:13: warning: unused variable 'z' [-Wunused-variable]
   76 |   int e,x,y,z,n,m;
      |             ^
foo.cc: In function 'void build(long long int, long long int, long long int)':
foo.cc:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   34 |   scanf("%lld",&cnt[rt].num);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:77:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   77 |      scanf("%lld%lld",&n,&m);
      |      ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:81:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   81 |       scanf("%lld",&e);
      |       ~~~~~^~~~~~~~~~~
foo.cc:84:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   84 |        scanf("%lld%lld",&x,&y);
      |        ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:92:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   92 |        scanf("%lld%lld",&x,&y);
      |        ~~~~~^~~~~~~~~~~~~~~~~~

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