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-rw-r--r--other/letter_combo_number.cpp32
1 files changed, 32 insertions, 0 deletions
diff --git a/other/letter_combo_number.cpp b/other/letter_combo_number.cpp
new file mode 100644
index 0000000..c15a628
--- /dev/null
+++ b/other/letter_combo_number.cpp
@@ -0,0 +1,32 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ vector<string> letterCombinations(string digits) {
+ if (digits.empty())
+ return {};
+ vector<string> ans;
+ ans.push_back("");
+ for (auto digit : digits) {
+ vector<string> tmp;
+ for (auto candidate : nums[digit - '0'])
+ for (auto s : ans)
+ tmp.push_back(s + candidate);
+ ans.swap(tmp);
+ }
+ for (int i = 0; i < digits.size(); i++)
+ cout << ans[i];
+ return ans;
+ }
+
+private:
+ const vector<string> nums = {"", "", "abc", "def", "ghi",
+ "jkl", "mno", "pqrs", "tuv", "wxyz"};
+};
+
+int main() {
+ string digits = "23";
+ cout << digits << endl;
+ Solution obj;
+ obj.letterCombinations(digits);
+}