{"id":9332,"date":"2021-12-31T14:11:02","date_gmt":"2021-12-31T22:11:02","guid":{"rendered":"https:\/\/zxi.mytechroad.com\/blog\/?p=9332"},"modified":"2021-12-31T14:11:43","modified_gmt":"2021-12-31T22:11:43","slug":"leetcode-1961-check-if-string-is-a-prefix-of-array","status":"publish","type":"post","link":"https:\/\/zxi.mytechroad.com\/blog\/string\/leetcode-1961-check-if-string-is-a-prefix-of-array\/","title":{"rendered":"\u82b1\u82b1\u9171 LeetCode 1961. Check If String Is a Prefix of Array"},"content":{"rendered":"\n

Given a string s<\/code> and an array of strings words<\/code>, determine whether s<\/code> is a prefix string<\/strong> of words<\/code>.<\/p>\n\n\n\n

A string s<\/code> is a prefix string<\/strong> of words<\/code> if s<\/code> can be made by concatenating the first k<\/code> strings in words<\/code> for some positive<\/strong> k<\/code> no larger than words.length<\/code>.<\/p>\n\n\n\n

Return true<\/code> if <\/em>s<\/code> is a prefix string<\/strong> of <\/em>words<\/code>, or <\/em>false<\/code> otherwise<\/em>.<\/p>\n\n\n\n

Example 1:<\/strong><\/p>\n\n\n\n

Input:<\/strong> s = \"iloveleetcode\", words = [\"i\",\"love\",\"leetcode\",\"apples\"]\nOutput:<\/strong> true\nExplanation:<\/strong>\ns can be made by concatenating \"i\", \"love\", and \"leetcode\" together.\n<\/pre>\n\n\n\n
Example 2:<\/strong><\/p>\n\n\n\n
Input:<\/strong> s = \"iloveleetcode\", words = [\"apples\",\"i\",\"love\",\"leetcode\"]\nOutput:<\/strong> false\nExplanation:<\/strong>\nIt is impossible to make s using a prefix of arr.<\/pre>\n\n\n\n
Constraints:<\/strong><\/p>\n\n\n\n
  • 1 <= words.length <= 100<\/code><\/li>
  • 1 <= words[i].length <= 20<\/code><\/li>
  • 1 <= s.length <= 1000<\/code><\/li>
  • words[i]<\/code> and s<\/code> consist of only lowercase English letters.<\/li><\/ul>\n\n\n\n
    Solution: Concat and test<\/strong><\/h2>\n\n\n\n
    Time complexity: O(n)
    Space complexity: O(n)<\/p>\n\n\n\n
    \n
    C++<\/h2>\n
    \n\n
    \n\/\/ Author: Huahua\nclass Solution {\npublic:\n  bool isPrefixString(string s, vector& words) {\n    string t;\n    for (const string& w : words) {\n      t += w;\n      if (t.length() >= s.length()) break;\n    }\n    return t == s;\n  }\n};\n<\/pre>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
    Given a string s and an array of strings words, determine whether s is a prefix string of words. A string s is a prefix string of words if s can be made by concatenating the first k strings in words for some positive k no larger than words.length.…<\/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":[754,222,4],"class_list":["post-9332","post","type-post","status-publish","format-standard","hentry","category-string","tag-concat","tag-easy","tag-string","entry","simple"],"_links":{"self":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/9332","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=9332"}],"version-history":[{"count":2,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/9332\/revisions"}],"predecessor-version":[{"id":9334,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/9332\/revisions\/9334"}],"wp:attachment":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/media?parent=9332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/categories?post=9332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/tags?post=9332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}