[HNOI2007]\u7d27\u6025\u758f\u6563evacuate<\/p>\n
Time Limit:10000MS Memory Limit:165536K
Total Submit:57 Accepted:19
Case Time Limit:1000MS<\/p>\n
Description <\/strong><\/p>\n \u53d1\u751f\u4e86\u706b\u8b66\uff0c\u6240\u6709\u4eba\u5458\u9700\u8981\u7d27\u6025\u758f\u6563\uff01\u5047\u8bbe\u6bcf\u4e2a\u623f\u95f4\u662f\u4e00\u4e2aN M\u7684\u77e9\u5f62\u533a\u57df\u3002\u6bcf\u4e2a\u683c\u5b50\u5982\u679c\u662f’.’\uff0c\u90a3\u4e48\u8868\u793a\u8fd9\u662f\u4e00\u5757\u7a7a\u5730\uff1b\u5982\u679c\u662f’X’\uff0c\u90a3\u4e48\u8868\u793a\u8fd9\u662f\u4e00\u9762\u5899\uff0c\u5982\u679c\u662f’D’\uff0c\u90a3\u4e48\u8868\u793a\u8fd9\u662f\u4e00\u6247\u95e8\uff0c\u4eba\u4eec\u53ef\u4ee5\u4ece\u8fd9\u513f\u64a4\u51fa \u623f\u95f4\u3002\u5df2\u77e5\u95e8\u4e00\u5b9a\u5728\u623f\u95f4\u7684\u8fb9\u754c\u4e0a\uff0c\u5e76\u4e14\u8fb9\u754c\u4e0a\u4e0d\u4f1a\u6709\u7a7a\u5730\u3002\u6700\u521d\uff0c\u6bcf\u5757\u7a7a\u5730\u4e0a\u90fd\u6709\u4e00\u4e2a\u4eba\uff0c\u5728\u758f\u6563\u7684\u65f6\u5019\uff0c\u6bcf\u4e00\u79d2\u949f\u6bcf\u4e2a\u4eba\u90fd\u53ef\u4ee5\u5411\u4e0a\u4e0b\u5de6\u53f3\u56db\u4e2a\u65b9\u5411\u79fb\u52a8\u4e00\u683c\uff0c \u5f53\u7136\u4ed6\u4e5f\u53ef\u4ee5\u7ad9\u7740\u4e0d\u52a8\u3002\u758f\u6563\u5f00\u59cb\u540e\uff0c\u6bcf\u5757\u7a7a\u5730\u4e0a\u5c31\u6ca1\u6709\u4eba\u6570\u9650\u5236\u4e86\uff08\u4e5f\u5c31\u662f\u8bf4\u6bcf\u5757\u7a7a\u5730\u53ef\u4ee5\u540c\u65f6\u7ad9\u65e0\u6570\u4e2a\u4eba\uff09\u3002\u4f46\u662f\uff0c\u7531\u4e8e\u95e8\u5f88\u7a84\uff0c\u6bcf\u4e00\u79d2\u949f\u53ea\u80fd\u6709\u4e00\u4e2a\u4eba\u79fb\u52a8\u5230 \u95e8\u7684\u4f4d\u7f6e\uff0c\u4e00\u65e6\u79fb\u52a8\u5230\u95e8\u7684\u4f4d\u7f6e\uff0c\u5c31\u8868\u793a\u4ed6\u5df2\u7ecf\u5b89\u5168\u64a4\u79bb\u4e86\u3002\u73b0\u5728\u7684\u95ee\u9898\u662f\uff1a\u5982\u679c\u5e0c\u671b\u6240\u6709\u7684\u4eba\u5b89\u5168\u64a4\u79bb\uff0c\u6700\u77ed\u9700\u8981\u591a\u5c11\u65f6\u95f4\uff1f\u6216\u8005\u544a\u77e5\u6839\u672c\u4e0d\u53ef\u80fd\u3002 <\/p>\n Input <\/strong><\/p>\n \u8f93\u5165\u6587\u4ef6\u7b2c\u4e00\u884c\u662f\u7531\u7a7a\u683c\u9694\u5f00\u7684\u4e00\u5bf9\u6b63\u6574\u6570N\u4e0eM\uff0c3<=N <=20\uff0c3<=M<=20\uff0c\u4ee5\u4e0bN\u884cM\u5217\u63cf\u8ff0\u4e00\u4e2aN M\u7684\u77e9\u9635\u3002\u5176\u4e2d\u7684\u5143\u7d20\u53ef\u4e3a\u5b57\u7b26’.’\u3001’X’\u548c’D’\uff0c\u4e14\u5b57\u7b26\u95f4\u65e0\u7a7a\u683c\u3002 <\/p>\n Output <\/strong><\/p>\n \u53ea\u6709\u4e00\u4e2a\u6574\u6570K\uff0c\u8868\u793a\u8ba9\u6240\u6709\u4eba\u5b89\u5168\u64a4\u79bb\u7684\u6700\u77ed\u65f6\u95f4\uff0c\u5982\u679c\u4e0d\u53ef\u80fd\u64a4\u79bb\uff0c\u90a3\u4e48\u8f93\u51fa’impossible’\uff08\u4e0d\u5305\u62ec\u5f15\u53f7\uff09\u3002 <\/p>\n Sample Input <\/strong><\/p>\n 5 5 Sample Output <\/strong><\/p>\n 3<\/p>\n Source <\/strong><\/p>\n 61.187.179.132:8080\/JudgeOnline\/showproblem<\/a> [HNOI2007]\u7d27\u6025\u758f\u6563evacuate Time Limit:10000MS Memory Limit:165536KTotal Submit:57 Accepted:19 Case Time Limit:1000MS Description \u53d1\u751f\u4e86\u706b\u8b66\uff0c\u6240\u6709\u4eba\u5458\u9700\u8981\u7d27\u6025\u758f\u6563\uff01\u5047\u8bbe\u6bcf\u4e2a\u623f\u95f4\u662f\u4e00\u4e2aN M\u7684\u77e9\u5f62\u533a\u57df\u3002\u6bcf\u4e2a\u683c\u5b50\u5982\u679c\u662f’.’\uff0c\u90a3\u4e48\u8868\u793a\u8fd9\u662f\u4e00\u5757\u7a7a\u5730\uff1b\u5982\u679c\u662f’X’\uff0c\u90a3\u4e48\u8868\u793a\u8fd9\u662f\u4e00\u9762\u5899\uff0c\u5982\u679c\u662f’D’\uff0c\u90a3\u4e48\u8868\u793a\u8fd9\u662f\u4e00\u6247\u95e8\uff0c\u4eba\u4eec\u53ef\u4ee5\u4ece\u8fd9\u513f\u64a4\u51fa \u623f\u95f4\u3002\u5df2\u77e5\u95e8\u4e00\u5b9a\u5728\u623f\u95f4\u7684\u8fb9\u754c\u4e0a\uff0c\u5e76\u4e14\u8fb9\u754c\u4e0a\u4e0d\u4f1a\u6709\u7a7a\u5730\u3002\u6700\u521d\uff0c\u6bcf\u5757\u7a7a\u5730\u4e0a\u90fd\u6709\u4e00\u4e2a\u4eba\uff0c\u5728\u758f\u6563\u7684\u65f6\u5019\uff0c\u6bcf\u4e00\u79d2\u949f\u6bcf\u4e2a\u4eba\u90fd\u53ef\u4ee5\u5411\u4e0a\u4e0b\u5de6\u53f3\u56db\u4e2a\u65b9\u5411\u79fb\u52a8\u4e00\u683c\uff0c \u5f53\u7136\u4ed6\u4e5f\u53ef\u4ee5\u7ad9\u7740\u4e0d\u52a8\u3002\u758f\u6563\u5f00\u59cb\u540e\uff0c\u6bcf\u5757\u7a7a\u5730\u4e0a\u5c31\u6ca1\u6709\u4eba\u6570\u9650\u5236\u4e86\uff08\u4e5f\u5c31\u662f\u8bf4\u6bcf\u5757\u7a7a\u5730\u53ef\u4ee5\u540c\u65f6\u7ad9\u65e0\u6570\u4e2a\u4eba\uff09\u3002\u4f46\u662f\uff0c\u7531\u4e8e\u95e8\u5f88\u7a84\uff0c\u6bcf\u4e00\u79d2\u949f\u53ea\u80fd\u6709\u4e00\u4e2a\u4eba\u79fb\u52a8\u5230 \u95e8\u7684\u4f4d\u7f6e\uff0c\u4e00\u65e6\u79fb\u52a8\u5230\u95e8\u7684\u4f4d\u7f6e\uff0c\u5c31\u8868\u793a\u4ed6\u5df2\u7ecf\u5b89\u5168\u64a4\u79bb\u4e86\u3002\u73b0\u5728\u7684\u95ee\u9898\u662f\uff1a\u5982\u679c\u5e0c\u671b\u6240\u6709\u7684\u4eba\u5b89\u5168\u64a4\u79bb\uff0c\u6700\u77ed\u9700\u8981\u591a\u5c11\u65f6\u95f4\uff1f\u6216\u8005\u544a\u77e5\u6839\u672c\u4e0d\u53ef\u80fd\u3002 Input \u8f93\u5165\u6587\u4ef6\u7b2c\u4e00\u884c\u662f\u7531\u7a7a\u683c\u9694\u5f00\u7684\u4e00\u5bf9\u6b63\u6574\u6570N\u4e0eM\uff0c3<=N <=20\uff0c3<=M<=20\uff0c\u4ee5\u4e0bN\u884cM\u5217\u63cf\u8ff0\u4e00\u4e2aN M\u7684\u77e9\u9635\u3002\u5176\u4e2d\u7684\u5143\u7d20\u53ef\u4e3a\u5b57\u7b26’.’\u3001’X’\u548c’D’\uff0c\u4e14\u5b57\u7b26\u95f4\u65e0\u7a7a\u683c\u3002 Output \u53ea\u6709\u4e00\u4e2a\u6574\u6570K\uff0c\u8868\u793a\u8ba9\u6240\u6709\u4eba\u5b89\u5168\u64a4\u79bb\u7684\u6700\u77ed\u65f6\u95f4\uff0c\u5982\u679c\u4e0d\u53ef\u80fd\u64a4\u79bb\uff0c\u90a3\u4e48\u8f93\u51fa’impossible’\uff08\u4e0d\u5305\u62ec\u5f15\u53f7\uff09\u3002 Sample Input 5 5 XXXXXX…DXX.XXX..XXXXDXX Sample Output 3 Source 61.187.179.132:8080\/JudgeOnline\/showproblem\u5199\u4e86\u534a\u5929\u7684\u4ee3\u7801\uff0c\u7d2f\u6b7b\u4e86\u3002\u4e0d\u8fc7SAP\u8fd8\u771f\u662f\u5feb\u554a\u3002\u3002\u9996\u5148\u6211\u7684\u7b2c\u4e00\u611f\u89c9\u662f\u6700\u4f18\u6027\u6539\u5224\u5b9a\u6027\uff0c\u90a3\u4e48\u5982\u4f55\u5224\u65ad\u80fd\u5426\u5728\u9650\u5b9a\u65f6\u95f4T\u5185\u5c06\u6240\u6709\u4eba\u8f6c\u79fb\u8d70\u5462\uff1f\u5f88\u663e\u7136\u5148\u7279\u5224\u4e00\u4e0b\u65e0\u89e3\u7684\u60c5\u51b5\uff0c\u9996\u5148\u4ece\u6bcf\u4e2a\u95e8BFS\u51fa\u5b83\u5230\u6bcf\u4e2a\u8282\u70b9\u7684\u6700\u77ed\u8def\uff0c\u90a3\u4e48\u5b83\u6700\u591a\u80fd\u914d\u4e0aT\u4e2a\u70b9\u4e14\u8fd9T\u4e2a\u70b9\u5230\u4ed6\u7684\u6700\u77ed\u8def\u957f\u5ea6\u8981\u5c0f\u4e8eT\u3002\u90a3\u4e48\u5c31\u53ef\u4ee5\u8f6c\u5316\u6210\u7f51\u7edc\u6d41\u95ee\u9898\uff0c\u4ece\u6e90\u5411\u6bcf\u4e2a\u95e8\u8fde\u4e00\u6761\u5bb9\u91cf\u4e3aT\u7684\u8fb9\uff0c\u4ece\u6bcf\u4e2a\u7a7a\u5730\u5411\u6c47\u8fde\u4e00\u6761\u5bb9\u91cf\u4e3a1\u7684\u8fb9\uff0c\u7136\u540e\u4e0d\u65ad\u589e\u52a0T\u5c31\u53ef\u4ee5\u4e86\u3002\u3002\u5c31\u8fd9\u4e48A\u6389\u4e86\u3002\u53ef\u4e3a\u4ec0\u4e48\u8fd9\u6837\u662f\u53ef\u4ee5\u7684\uff1f\u6211\u611f\u89c9\u5982\u679c\u914d\u4e0a\u7684T\u4e2a\u70b9\u79bb\u7684\u6bd4\u8f83\u8fdc\u7684\u8bdd\u5728\u95e8\u4e0a\u4f1a\u5361\u4f4f\u7684\u56e7\uff0c\u4e5f\u5c31\u4e0d\u53ef\u80fd\u5b8c\u5168\u5229\u7528T\u7684\u65f6\u95f4\u4e86\u751a\u81f3\u597d\u50cf\u53ef\u4ee5\u627e\u51fa\u53cd\u4f8b\uff08\u6211\u6ca1\u627e\u51fa\u6765\uff09\u3002\u3002\u4e5f\u8bb8\u662f\u56e0\u4e3a\u4e00\u4e2a\u8ddd\u79bb\u4e3ad\u7684\u70b9\u4e4b\u524d\u5fc5\u7136\u6709\u4e00\u4e2a\u8ddd\u79bb\u4e3ad-1\u7684\u70b9\u4e4b\u7c7b\u7684\u6027\u8d28\uff1f\u8ff7\u832b\u4e86\u3002\u3002Code(\u8d85\u8fc7\u6700\u5927\u957f\u5ea6\u53d1\u4e0d\u4e0a\u6765\u56e7\u3002\u3002):\u653e\u5728ideone\u4e0a\u5427\uff1awww.ideone.com\/OdFo4hbA#<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/172"}],"collection":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=172"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/172\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=172"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=172"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
XXXXX
X…D
XX.XX
X..XX
XXDXX<\/p>\n
\u5199\u4e86\u534a\u5929\u7684\u4ee3\u7801\uff0c\u7d2f\u6b7b\u4e86\u3002\u4e0d\u8fc7SAP\u8fd8\u771f\u662f\u5feb\u554a\u3002\u3002
\u9996\u5148\u6211\u7684\u7b2c\u4e00\u611f\u89c9\u662f\u6700\u4f18\u6027\u6539\u5224\u5b9a\u6027\uff0c\u90a3\u4e48\u5982\u4f55\u5224\u65ad\u80fd\u5426\u5728\u9650\u5b9a\u65f6\u95f4T\u5185\u5c06\u6240\u6709\u4eba\u8f6c\u79fb\u8d70\u5462\uff1f\u5f88\u663e\u7136\u5148\u7279\u5224\u4e00\u4e0b\u65e0\u89e3\u7684\u60c5\u51b5\uff0c\u9996\u5148\u4ece\u6bcf\u4e2a\u95e8BFS\u51fa\u5b83\u5230\u6bcf\u4e2a\u8282\u70b9\u7684\u6700\u77ed\u8def\uff0c\u90a3\u4e48\u5b83\u6700\u591a\u80fd\u914d\u4e0aT\u4e2a\u70b9\u4e14\u8fd9T\u4e2a\u70b9\u5230\u4ed6\u7684\u6700\u77ed\u8def\u957f\u5ea6\u8981\u5c0f\u4e8eT\u3002\u90a3\u4e48\u5c31\u53ef\u4ee5\u8f6c\u5316\u6210\u7f51\u7edc\u6d41\u95ee\u9898\uff0c\u4ece\u6e90\u5411\u6bcf\u4e2a\u95e8\u8fde\u4e00\u6761\u5bb9\u91cf\u4e3aT\u7684\u8fb9\uff0c\u4ece\u6bcf\u4e2a\u7a7a\u5730\u5411\u6c47\u8fde\u4e00\u6761\u5bb9\u91cf\u4e3a1\u7684\u8fb9\uff0c\u7136\u540e\u4e0d\u65ad\u589e\u52a0T\u5c31\u53ef\u4ee5\u4e86\u3002\u3002
\u5c31\u8fd9\u4e48A\u6389\u4e86\u3002\u53ef\u4e3a\u4ec0\u4e48\u8fd9\u6837\u662f\u53ef\u4ee5\u7684\uff1f\u6211\u611f\u89c9\u5982\u679c\u914d\u4e0a\u7684T\u4e2a\u70b9\u79bb\u7684\u6bd4\u8f83\u8fdc\u7684\u8bdd\u5728\u95e8\u4e0a\u4f1a\u5361\u4f4f\u7684\u56e7\uff0c\u4e5f\u5c31\u4e0d\u53ef\u80fd\u5b8c\u5168\u5229\u7528T\u7684\u65f6\u95f4\u4e86\u751a\u81f3\u597d\u50cf\u53ef\u4ee5\u627e\u51fa\u53cd\u4f8b\uff08\u6211\u6ca1\u627e\u51fa\u6765\uff09\u3002\u3002
\u4e5f\u8bb8\u662f\u56e0\u4e3a\u4e00\u4e2a\u8ddd\u79bb\u4e3ad\u7684\u70b9\u4e4b\u524d\u5fc5\u7136\u6709\u4e00\u4e2a\u8ddd\u79bb\u4e3ad-1\u7684\u70b9\u4e4b\u7c7b\u7684\u6027\u8d28\uff1f\u8ff7\u832b\u4e86\u3002\u3002
Code(\u8d85\u8fc7\u6700\u5927\u957f\u5ea6\u53d1\u4e0d\u4e0a\u6765\u56e7\u3002\u3002):
\u653e\u5728ideone\u4e0a\u5427\uff1a
www.ideone.com\/OdFo4hbA#<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"