/in/foo.cc: In function 'bool bfs()':
/in/foo.cc:84:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for( register int i = 0 ; i < linker[ now ].size() ; i++ )
                           ~~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int dinic(int, int)':
/in/foo.cc:93:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for( register int i = cur[ now ] ; i < linker[ now ].size() ; i++ )
                                    ~~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void topo()':
/in/foo.cc:119:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for( register int i = 0 ; i < linker[ now ].size() ; i++ )
                           ~~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:146:45: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 while( bfs() ) while( temp = dinic( s , inf ) ) ans -= temp;
                                             ^