foo.cc: In function 'bool bfs()':
foo.cc:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for( register int i = 0 ; i < linker[ now ].size() ; i++ )
                           ~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int dinic(int, int)':
foo.cc:54:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for( register int i = cur[ now ] ; i < linker[ now ].size() ; i++ )
                                    ~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:79:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 while( bfs() ) while( temp = dinic( s , inf ) ) ans -= temp;
                       ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:70:61: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 for( register int i = 1 ; i <= n ; i++ ) scanf( "%d" , &a ) , addedge( i , t , a );
                                          ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:73:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d %d %d" , &a , &b , &c );
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。