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826. 单链表
https://www.acwing.com/problem/content/submission/code_detail/7357618/
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AcWing/826/826.cpp
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37
AcWing/826/826.cpp
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#include <bits/stdc++.h>
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using namespace std;
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int m, k, x, t;
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char op;
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list<int> a;
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list<int>::iterator it[100005];
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int main() {
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cin >> m;
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while (m--) {
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cin >> op;
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if (op == 'H') {
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cin >> x;
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a.push_front(x);
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it[++t] = a.begin();
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} else if (op == 'D') {
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cin >> k;
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if (k == 0) {
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a.pop_front();
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} else {
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auto itk = it[k];
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a.erase(++itk);
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}
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} else {
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cin >> k >> x;
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auto itk = it[k];
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it[++t] = a.insert(++itk, x);
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}
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}
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for (int i : a) {
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cout << i << ' ';
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}
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cout << endl;
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return 0;
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}
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