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OI-codes/AcWing/827/827.cpp

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;
}