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Diffstat (limited to 'other/verify_alien_dict.cpp')
-rw-r--r-- | other/verify_alien_dict.cpp | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/other/verify_alien_dict.cpp b/other/verify_alien_dict.cpp new file mode 100644 index 0000000..009ac52 --- /dev/null +++ b/other/verify_alien_dict.cpp @@ -0,0 +1,42 @@ +// 953. Verifying an Alien Dictionary +#include "leetcode.h" + +/* + * in an alien language, they also use english lowercase letters but in + * different 'order'. the 'order' of the alphabet is some permutation of + * lowercase letters. given a sequence of 'words' written in the alien language, + * and the 'order' of the alphabet, return 1 if and only if the given 'words' + * are sorted lexicographically in this alien language. + */ + +class Solution { +public: + bool isAlienSorted(vector<string> &words, string order) { + size_t indices[26]{}; + for (size_t i = 0; i < order.size(); ++i) + indices[order[i] - 'a'] = i; + return is_sorted(words.begin(), words.end(), + [&indices](const string &w1, const string &w2) { + auto l1 = w1.size(), l2 = w2.size(); + for (auto i = 0; i < min(l1, l2); ++i) { + auto c1 = w1[i], c2 = w2[i]; + if (c1 != c2) + return indices[c1 - 'a'] < indices[c2 - 'a']; + } + return l1 < l2; + }); + } +}; + +int main() { + Solution obj; + vector<string> words1 = {"hello", "leetcode"}; + vector<string> words2 = {"word", "world", "row"}; + vector<string> words3 = {"apple", "app"}; + cout << obj.isAlienSorted(words1, "hlabcdefgijkmnopqrstuvwxyz") + << endl; // expect: 1 + cout << obj.isAlienSorted(words2, "worldabcefghijkmnpqstuvxyz") + << endl; // expect: 0 + cout << obj.isAlienSorted(words3, "abcdefghijklmnopqrstuvwxyz") + << endl; // expect: 0 +} |