{"id":2484,"date":"2018-04-14T20:15:39","date_gmt":"2018-04-15T03:15:39","guid":{"rendered":"http:\/\/zxi.mytechroad.com\/blog\/?p=2484"},"modified":"2018-04-15T01:04:16","modified_gmt":"2018-04-15T08:04:16","slug":"leetcode-816-ambiguous-coordinates","status":"publish","type":"post","link":"https:\/\/zxi.mytechroad.com\/blog\/string\/leetcode-816-ambiguous-coordinates\/","title":{"rendered":"\u82b1\u82b1\u9171 LeetCode 816. Ambiguous Coordinates"},"content":{"rendered":"

Problem<\/strong><\/h1>\n

\u9898\u76ee\u5927\u610f\uff1a\u628a\u4e00\u4e32\u6570\u5b57\u5206\u6210\u4e24\u6bb5\uff0c\u8f93\u51fa\u6240\u6709\u5408\u6cd5\u7684\u5206\u6cd5\uff08\u53ef\u4ee5\u52a0\u5c0f\u6570\u70b9\uff09\u3002<\/p>\n

https:\/\/leetcode.com\/problems\/ambiguous-coordinates\/description\/<\/a><\/p>\n

We had some 2-dimensional coordinates, like\u00a0\"(1, 3)\"<\/code>\u00a0or\u00a0\"(2, 0.5)\"<\/code>.\u00a0 Then, we removed\u00a0all commas, decimal points, and spaces, and ended up with the string\u00a0S<\/code>.\u00a0 Return a list of strings representing\u00a0all possibilities for what our original coordinates could have been.<\/p>\n

Our original representation never had extraneous zeroes, so we never started with numbers like “00”, “0.0”, “0.00”, “1.0”, “001”, “00.01”, or any other number that can be represented with\u00a0less digits.\u00a0 Also, a decimal point within a number never occurs without at least one digit occuring before it, so we never started with numbers like “.1”.<\/p>\n

The final answer list can be returned in any order.\u00a0 Also note that all coordinates in the final answer\u00a0have exactly one space between them (occurring after the comma.)<\/p>\n

Example 1:<\/strong>\r\nInput:<\/strong> \"(123)\"\r\nOutput:<\/strong> [\"(1, 23)\", \"(12, 3)\", \"(1.2, 3)\", \"(1, 2.3)\"]\r\n<\/pre>\n
Example 2:<\/strong>\r\nInput:<\/strong> \"(00011)\"\r\nOutput:<\/strong> \u00a0[\"(0.001, 1)\", \"(0, 0.011)\"]\r\nExplanation:<\/strong> \r\n0.0, 00, 0001 or 00.01 are not allowed.\r\n<\/pre>\n
Example 3:<\/strong>\r\nInput:<\/strong> \"(0123)\"\r\nOutput:<\/strong> [\"(0, 123)\", \"(0, 12.3)\", \"(0, 1.23)\", \"(0.1, 23)\", \"(0.1, 2.3)\", \"(0.12, 3)\"]\r\n<\/pre>\n
Example 4:<\/strong>\r\nInput:<\/strong> \"(100)\"\r\nOutput:<\/strong> [(10, 0)]\r\nExplanation:<\/strong> \r\n1.0 is not allowed.\r\n<\/pre>\n
Solution: Brute Force<\/strong><\/h1>\n
Time complexity: O(n^3)<\/p>\n
Space complexity: O(n)<\/p>\n
C++<\/p>\n
\/\/ Author: Huahua\r\n\/\/ Running time: 16 ms\r\nclass Solution {\r\npublic:\r\n  vector<string> ambiguousCoordinates(string S) {\r\n    vector<string> ans;\r\n    int n = S.length();\r\n    for (int l1 = 1; l1 <= n - 3; ++l1) {      \r\n      int l2 = n - l1 - 2;\r\n      string s1 = S.substr(1, l1);\r\n      string s2 = S.substr(l1 + 1, l2);      \r\n      if (valid(s1) && valid(s2))\r\n        ans.push_back(\"(\" + s1 + \", \" + s2 + \")\");\r\n      \r\n      for (int i = 0; i < l1; ++i) {\r\n        string ts1 = s1;\r\n        if (i > 0) ts1.insert(i, \".\");        \r\n        if (!valid(ts1)) continue;\r\n        for (int j = 0; j < l2; ++j) {\r\n          if (i == 0 && j == 0) continue;\r\n          string ts2 = s2;\r\n          if (j > 0) ts2.insert(j, \".\");          \r\n          if (!valid(ts2)) continue;          \r\n          ans.push_back(\"(\" + ts1 + \", \" + ts2 + \")\");\r\n        }\r\n      }\r\n    }\r\n    \r\n    return ans;\r\n  }\r\nprivate:    \r\n  bool valid(const string& s) {\r\n    bool p = false; \/\/ has \".\"\r\n    bool d = false; \/\/ has digits in front of \".\"\r\n    int zeros = 0;  \/\/ leading zeros\r\n    int i = 0;\r\n    while (s[zeros] == '0' && zeros < s.length()) ++zeros;\r\n    for (int i = zeros; i < s.length(); ++i) {\r\n      if (!p && isdigit(s[i])) d = true;\r\n      if (s[i] == '.') p = true;\r\n    }\r\n    if (zeros == 1 && s != \"0\" && !p || zeros > 1) return false;\r\n    if (p && (s.back() == '0' || s.back() == '.' || zeros > 0 && d)) return false;    \r\n    return true;\r\n  }\r\n};<\/pre>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
Problem \u9898\u76ee\u5927\u610f\uff1a\u628a\u4e00\u4e32\u6570\u5b57\u5206\u6210\u4e24\u6bb5\uff0c\u8f93\u51fa\u6240\u6709\u5408\u6cd5\u7684\u5206\u6cd5\uff08\u53ef\u4ee5\u52a0\u5c0f\u6570\u70b9\uff09\u3002 https:\/\/leetcode.com\/problems\/ambiguous-coordinates\/description\/ We had some 2-dimensional coordinates, like\u00a0“(1, 3)”\u00a0or\u00a0“(2, 0.5)”.\u00a0 Then, we removed\u00a0all commas, decimal points, and spaces, and ended up with the string\u00a0S.\u00a0…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[297,65,4,286],"class_list":["post-2484","post","type-post","status-publish","format-standard","hentry","category-string","tag-format","tag-number","tag-string","tag-valid","entry","simple"],"_links":{"self":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/2484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/comments?post=2484"}],"version-history":[{"count":6,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/2484\/revisions"}],"predecessor-version":[{"id":2498,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/2484\/revisions\/2498"}],"wp:attachment":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/media?parent=2484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/categories?post=2484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/tags?post=2484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}