{"id":327,"date":"2020-09-26T10:26:19","date_gmt":"2020-09-26T02:26:19","guid":{"rendered":"http:\/\/39.96.58.60\/?p=327"},"modified":"2022-10-18T16:39:50","modified_gmt":"2022-10-18T08:39:50","slug":"leetcode-%e5%89%91%e6%8c%87-offer-20-%e8%a1%a8%e7%a4%ba%e6%95%b0%e5%80%bc%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=327","title":{"rendered":"Leetcode \u5251\u6307 Offer 20. \u8868\u793a\u6570\u503c\u7684\u5b57\u7b26\u4e32"},"content":{"rendered":"

\u8bf7\u5b9e\u73b0\u4e00\u4e2a\u51fd\u6570\u7528\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u8868\u793a\u6570\u503c\uff08\u5305\u62ec\u6574\u6570\u548c\u5c0f\u6570\uff09\u3002\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32”+100″\u3001”5e2″\u3001”-123″\u3001”3.1416″\u3001”-1E-16″\u3001”0123″\u90fd\u8868\u793a\u6570\u503c\uff0c\u4f46”12e”\u3001”1a3.14″\u3001”1.2.3″\u3001”+-5″\u53ca”12e+5.4″\u90fd\u4e0d\u662f\u3002<\/p>\n

 <\/p>\n

**\u96be\u5ea6**: Medium<\/p>\n

**\u6807\u7b7e**: \u6570\u5b66\u3001<\/p>\n

\n
\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a48 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8655.80% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.8 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8616.54% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u6709\u9650\u72b6\u6001\u81ea\u52a8\u673a\n\n    \u5b57\u7b26\u53ef\u5206\u4e3a\uff1a\n        1. \"\"             \u7a7a\u683c\n        2. '0123456789'   \u6570\u5b57\n        3. '+-'           \u6b63\u8d1f\u53f7\n        4. '.'            \u5c0f\u6570\u70b9\n        5. 'e,E'          \u6307\u6570\u7b26\u53f7\n    \u72b6\u6001\u53ef\u5206\u4e3a\uff1a\n        1. \u8d77\u59cb\u72b6\u6001\n            \u8d77\u59cb\u72b6\u6001\u9700\u8981\u8003\u8651 \u7a7a\u683c\u95ee\u9898\u3002 \u4e14\u4e0d\u80fd\u76f4\u63a5e\u5f00\u5934\n        2. e\u524d\u6b63\u8d1f\u53f7\n            e\u524d\u540e\u5747\u53ef\u5b58\u5728\u6b63\u8d1f\u6570\u3002\n        3. .\u524d\u6570\u5b57\n            .\u524d\u6570\u5b57\u4e3a\u6574\u6570\uff0c\u5176\u540e\u53ef\u4ee5\u63a5\u5c0f\u6570\u70b9\u6784\u6210\u5c0f\u6570\n        4. .\u540e\u6570\u5b57\n            .\u540e\u6570\u5b57\u5df2\u7ecf\u662f\u5c0f\u6570\uff0c\u4e0d\u53ef\u63a5\u5c0f\u6570\u70b9\n        5. ''.\u540e\u6570\u5b57       \u4f8b\uff1a .6   .13\n            .5 \u662f\u5408\u6cd5\u7684\uff0c \u4f46\u8fd9\u79cd\u5f62\u5f0f\u4e0d\u4ee5\u63a5e\u3002  \u4f8b\uff1a .5e4 \u662f\u4e0d\u5408\u6cd5\u7684, \u5408\u6cd5\u5199\u6cd5\u5e94\u662f5e3\n        6. e\n            e\u540e\u53ef\u4ee5\u63a5\u6570\u5b57\uff0c\u6216\u63a5\u6b63\u8d1f\u53f7\n        7. e\u540e\u7b26\u53f7\n            e\u540e\u7b26\u53f7\uff0c\u53ea\u80fd\u63a5\u6570\u5b57\n        8. e\u540e\u6570\u5b57\n            e\u540e\u6570\u5b57\u53ea\u80fd\u63a5\u6570\u5b57\n        9. \u7a7a\u683c\n            \u5904\u7406\u7ed3\u5c3e\u7a7a\u683c\n    \u5177\u4f53\u5b9e\u73b0\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\n\nclass Solution:\n    def isNumber(self, s: str) -> bool:\n        states = [\n            {'\u7a7a\u683c': 0,       '\u6570\u5b57': 2,        '\u6b63\u8d1f\u53f7': 1,       '\u5c0f\u6570\u70b9': 4,       'e': None}, # \u8d77\u59cb\u3002       \u5ffd\u7565\u8d77\u59cb\u7a7a\u683c\uff0c\u53ef\u7531\u6570\u5b57\u3001\u6b63\u8d1f\u53f7\u3001\u5c0f\u6570\u70b9\u5f00\u5934\n            {'\u7a7a\u683c': None,    '\u6570\u5b57': 2,        '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': 4,       'e': None}, # e\u524d\u6b63\u8d1f\u53f7\u3002   \u6b63\u8d1f\u53f7\u540e\u53ef\u63a5\u6570\u5b57\u6216\u6b63\u8d1f\u53f7\n            {'\u7a7a\u683c': 8,       '\u6570\u5b57': 2,        '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': 3,       'e': 5},    # .\u524d\u6570\u5b57\u3002     .\u524d\u6570\u5b57\u5373\u4e3a\u6574\u6570\uff0c\u53ef\u63a5\u5c0f\u6570\u70b9\u3001\u6570\u5b57\u3001e\n            {'\u7a7a\u683c': 8,       '\u6570\u5b57': 3,        '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': None,    'e': 5},    # .\u540e\u6570\u5b57\u3002     \u5c0f\u6570\u70b9\u540e\u6570\u5b57\u53ef\u63a5e\u3001\u6570\u5b57\u3002 \u4f8b\uff1a 1.23e10\u5408\u6cd5\n            {'\u7a7a\u683c': None,    '\u6570\u5b57': 3,        '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': None,    'e': None}, # ''.\u540e\u6570\u5b57\u3002   \u4f8b\uff1a .4 \u5408\u6cd5\uff0c \u4f46\u540e\u4e0d\u80fd\u63a5e, .4e3\u4e0d\u5408\u6cd5\uff0c\u5408\u6cd5\u5199\u6cd5\u5e94\u662f4e2\u3002\n            {'\u7a7a\u683c': None,    '\u6570\u5b57': 7,        '\u6b63\u8d1f\u53f7': 6,       '\u5c0f\u6570\u70b9': None,    'e': None}, # e\u3002          e\u540e\u53ef\u63a5\u6570\u5b57\u6216 \u6b63\u8d1f\u53f7\u3002\n            {'\u7a7a\u683c': None,    '\u6570\u5b57': 7,        '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': None,    'e': None}, # e\u540e\u6b63\u8d1f\u53f7\u3002   e\u540e\u6b63\u8d1f\u53f7\u540e\u53ea\u53ef\u63a5\u6570\u5b57\n            {'\u7a7a\u683c': 8,       '\u6570\u5b57': 7,        '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': None,    'e': None}, # e\u540e\u6570\u5b57\u3002     e\u540e\u6570\u5b57\u53ea\u53ef\u63a5\u6570\u5b57\n            {'\u7a7a\u683c': 8,       '\u6570\u5b57': None,     '\u6b63\u8d1f\u53f7': None,    '\u5c0f\u6570\u70b9': None,    'e': None}, # \u672b\u5c3e\u7a7a\u683c\u3002\n        ]\n        state = states[0]\n        for c in s:\n            if c == ' ':\n                c = '\u7a7a\u683c'\n            elif c in '0123456789':\n                c = '\u6570\u5b57'\n            elif c in '+-':\n                c = '\u6b63\u8d1f\u53f7'\n            elif c == '.':\n                c = '\u5c0f\u6570\u70b9'\n            elif c in 'eE':\n                c = 'e'\n            else:\n                return False\n\n            id = state[c]\n            if id == None:\n                return False\n\n            state = states[state[c]]\n        return state['\u7a7a\u683c'] in [2,3,7,8]<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u8bf7\u5b9e\u73b0\u4e00\u4e2a\u51fd\u6570\u7528\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u8868\u793a\u6570\u503c\uff08\u5305\u62ec\u6574\u6570\u548c\u5c0f\u6570\uff09\u3002\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32”+100″\u3001…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/327"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=327"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/327\/revisions"}],"predecessor-version":[{"id":328,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/327\/revisions\/328"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=327"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}