foo.cc: In function 'int main()':
foo.cc:119:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d%d" , &n , &len ) ;
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:123:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d" , &type ) ;
 ~~~~~^~~~~~~~~~~~~~~~
foo.cc:126:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d%d%d%d%d" , &t , &c , &l , &r , &d ) ; modify( t , c , l , r , d ) ;
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:129:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d%d%d" , &t , &l , &r ) ; printf( "%d\n" , query( t , l , r ) ) ;
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:132:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d%d" , &t , &c ) ; Delete( c ) ;
 ~~~~~^~~~~~~~~~~~~~~~~~~~

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