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| author | Yuqian Yang <crupest@crupest.life> | 2025-02-12 15:55:21 +0800 |
|---|---|---|
| committer | Yuqian Yang <crupest@crupest.life> | 2025-02-12 16:04:50 +0800 |
| commit | 77e6cdc863d2cbd9df578a665804daf28d8593fe (patch) | |
| tree | 62c9f3e071d8d1d6fe125fe801907db11784332e /works/solutions/leetcode/cpp/17.cpp | |
| parent | 10eb95869601e145b1d8bc909424777c25752d51 (diff) | |
| parent | a557fa36a22c5ef4a29da596ee1e3aa10be55984 (diff) | |
| download | crupest-77e6cdc863d2cbd9df578a665804daf28d8593fe.tar.gz crupest-77e6cdc863d2cbd9df578a665804daf28d8593fe.tar.bz2 crupest-77e6cdc863d2cbd9df578a665804daf28d8593fe.zip | |
import(solutions): IMPORT crupest/solutions COMPLETE.
Diffstat (limited to 'works/solutions/leetcode/cpp/17.cpp')
| -rw-r--r-- | works/solutions/leetcode/cpp/17.cpp | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/works/solutions/leetcode/cpp/17.cpp b/works/solutions/leetcode/cpp/17.cpp new file mode 100644 index 0000000..74e33b4 --- /dev/null +++ b/works/solutions/leetcode/cpp/17.cpp @@ -0,0 +1,56 @@ +#include <string>
+#include <vector>
+
+using std::string;
+using std::vector;
+
+vector<char> c_map[9]{
+ {'a', 'b', 'c'},
+ {'d', 'e', 'f'},
+ {'g', 'h', 'i'},
+ {'j', 'k', 'l'},
+ {'m', 'n', 'o'},
+ {'p', 'q', 'r', 's'},
+ {'t', 'u', 'v'},
+ {'w', 'x', 'y', 'z'}};
+
+void combine(const string::const_iterator ¤t, const string::const_iterator &end, string &head, vector<string> &result)
+{
+ const auto &chars = c_map[(*current) - '2'];
+
+ if (current == end)
+ {
+ for (auto c : chars)
+ {
+ head.push_back(c);
+ result.push_back(head);
+ head.pop_back();
+ }
+ return;
+ }
+
+ for (auto c : chars)
+ {
+ head.push_back(c);
+ combine(current + 1, end, head, result);
+ head.pop_back();
+ }
+}
+
+class Solution
+{
+public:
+ vector<string> letterCombinations(string digits)
+ {
+ std::vector<string> result;
+
+ if (digits.empty())
+ return result;
+
+ std::string head;
+
+ combine(digits.cbegin(), digits.cend() - 1, head, result);
+
+ return result;
+ }
+};
|