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772. 只出现一次的字符

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https://www.acwing.com/problem/content/submission/code_detail/6942793/
This commit is contained in:
Baoshuo Ren 2021-08-06 18:28:57 +08:00 committed by Baoshuo Ren
parent aedbc3fe09
commit 7f1abb0726
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 11 additions and 21 deletions
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32
AcWing/772/772.cpp
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@ -4,30 +4,20 @@ using namespace std;
int main() {
string s;
vector<char> ans;
int a = -1;
char c = 'a';
map<char, int> m;
queue<char> q;
cin >> s;
map<char, int> m, m1;
for (int i = 0; i < s.size(); i++) {
m[s[i]]++;
if (!m1.count(s[i])) m1[s[i]] = i;
for (char i : s) {
m[i]++;
q.push(i);
}
for (char i = 'a'; i <= 'z'; i++) {
if (m[i] == 1) {
ans.push_back(i);
while (!q.empty()) {
if (m[q.front()] == 1) {
cout << q.front() << endl;
exit(0);
}
q.pop();
}
if (ans.empty()) {
cout << "no" << endl;
} else {
for (char i : ans) {
if (a == -1 || m1[i] < a) {
a = m1[i];
c = i;
}
}
cout << c << endl;
}
cout << "no" << endl;
return 0;
}