mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-12-03 14:36:29 +00:00
40 lines
813 B
C++
40 lines
813 B
C++
#include <bits/stdc++.h>
|
|
|
|
using namespace std;
|
|
|
|
int m, x, k, p;
|
|
string op;
|
|
list<int> a;
|
|
list<int>::iterator it[100005];
|
|
|
|
int main() {
|
|
cin >> m;
|
|
while (m--) {
|
|
cin >> op;
|
|
if (op == "L") {
|
|
cin >> x;
|
|
a.push_front(x);
|
|
it[++p] = a.begin();
|
|
} else if (op == "R") {
|
|
cin >> x;
|
|
a.push_back(x);
|
|
it[++p] = --a.end();
|
|
} else if (op == "D") {
|
|
cin >> k;
|
|
a.erase(it[k]);
|
|
} else if (op == "IL") {
|
|
cin >> k >> x;
|
|
it[++p] = a.insert(it[k], x);
|
|
} else {
|
|
cin >> k >> x;
|
|
auto itk = it[k];
|
|
it[++p] = a.insert(++itk, x);
|
|
}
|
|
}
|
|
for (int i : a) {
|
|
cout << i << ' ';
|
|
}
|
|
cout << endl;
|
|
return 0;
|
|
}
|