foo.cc: In function 'int main()':
foo.cc:56:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&m,&k);
  ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:58:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  REP(i,n) scanf("%d",&val[i]);
           ~~~~~^~~~~~~~~~~~~~
foo.cc:59:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  REP(i,m) scanf("%d%d%d",&a[i].Y.X,&a[i].Y.Y,&a[i].X);
           ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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