/in/foo.cc: In function 'int turn(int)':
/in/foo.cc:25:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

VJ4Error('ProblemDataNotFoundError', '题目 5915767dd3d8a143b14119fd 的数据未找到。', 'jian_lan_zhong_xue', '5915767dd3d8a143b14119fd')