题解 | #字符流中第一个不重复的字符#
字符流中第一个不重复的字符
https://www.nowcoder.com/practice/00de97733b8e4f97a3fb5c680ee10720
class Solution {
public:
//Insert one char from stringstream
unordered_map<char, int> mp;
string s;
void Insert(char ch) {
s += ch;
mp[ch]++;
}
//return the first appearence once char in current stringstream
char FirstAppearingOnce() {
for (char i : s) {
if (mp[i] == 1) {
return i;
}
}
return '#';
}
};
哈希表就是好使啊！
