題目:
輸入一個字符串,打印出該字符串中字符的所有排列。你可以以任意順序返回這個字符串數組,但裏面不能有重複元素。
示例:
輸入:s = "abc"
輸出:["abc","acb","bac","bca","cab","cba"]
題解:
全排列
class Solution {
public:
vector<string> permutation(string s) {
sort(s.begin(),s.end());
vector<string>ans;
set<string>ss;
do
{
if(!ss.count(s))
{
ss.insert(s);
ans.push_back(s);
}
}while(next_permutation(s.begin(),s.end()));
return ans;
}
};