foo.cc: In function 'int main()':
foo.cc:28:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d" , &n ) ; an = 0 ;
 ~~~~~^~~~~~~~~~~~~
foo.cc:30:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d%d" , S + i , T + i ) ; T[ i ] += S[ i ] ;
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int getp(int)':
foo.cc:21:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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