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#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);
}
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