3 5 #...# ..#.. #...# 3 5 ##... ..... ....# 3 5 #.### #.#.# ###.# 3 5 #.#.. ..... ....# 0 0
City 1 4 bridges of total length 4 City 2 No bridges are possible. 2 disconnected groups City 3 No bridges are needed. City 4 1 bridge of total length 1 2 disconnected groups