foo.cc: In function 'int main()':
foo.cc:9:10: 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:11:47: 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:21:70: 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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