Codeforces Gym 100187 E. Two Labyrinths (双图BFS找共同最短路)
E.TwoLabyrinthstimelimitpertest2secondsmemorylimitpertest256megabytesinputstandardinputoutputstandardoutputAlabyrinthistherectangulargrid,eachofthecellsofwhichiseitherfreeorwall,andit'spossibletomoveo