foo.cc: In function 'bool bfs()':
foo.cc:44:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 | for( register int i = 0 ; i < linker[ now ].size() ; i++ )
      |                           ~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int dinic(int, int)':
foo.cc:54:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 | 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]
   79 | while( bfs() ) while( temp = dinic( s , inf ) ) ans -= temp;
      |                       ~~~~~^~~~~~~~~~~~~~~~~~

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