foo.cc: In function 'int main()':
foo.cc:9:7: 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:11:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for(int i=1,x; i<=n; i++) scanf("%d",&x),s1[i]=s1[i-1]+x;
                             ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
foo.cc:20:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for(int i=1,x,y; i<=n; i++) scanf("%d%d",&x,&y),s1[i]=s1[i-1]+x,s2[i]=s2[i-1]+y;
                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~

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