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| #include <iostream>
#include <cstdio>
#include <queue>
#include <cstring>
using namespace std;
const int N = 2010, M = 20010;
int n, x, y;
queue <int> q;
char str[20000010];
struct Node
{
char s[N];
int c, l, r;
}p[M];
void move(int k)
{
x = p[0].r;
while (k > p[x].c)
{
k -= p[x].c;
x = p[x].r;
}
y = k - 1;
}
void add(int u, int v)
{
p[v].r = p[u].r;
p[p[u].r].l = v;
p[u].r = v, p[v].l = u;
}
void del(int u)
{
p[p[u].l].r = p[u].r;
p[p[u].r].l = p[u].l;
p[u].l = p[u].r = p[u].c = 0;
q.push(u);
}
void insert(int k)
{
if (y < p[x].c - 1)
{
int u = q.front();
q.pop();
for (int i = y + 1; i < p[x].c; ++i)
p[u].s[p[u].c++] = p[x].s[i];
p[x].c = y + 1;
add(x, u);
}
int cur = x;
for (int i = 0; i < k;)
{
int u = q.front();
q.pop();
while (p[u].c < N && i < k)
p[u].s[p[u].c++] = str[i++];
add(cur, u);
cur = u;
}
}
void remove(int k)
{
if (p[x].c - 1 - y >= k)
{
for (int i = y + k + 1, j = y + 1; i < p[x].c; ++i, ++j)
p[x].s[j] = p[x].s[i];
p[x].c -= k;
}
else
{
k -= p[x].c - y - 1;
p[x].c = y + 1;
while (p[x].r && k >= p[p[x].r].c)
{
int u = p[x].r;
k -= p[u].c;
del(u);
}
int u = p[x].r;
for (int i = 0, j = k; j < p[u].c; ++i, ++j)
p[u].s[i] = p[u].s[j];
p[u].c -= k;
}
}
void get(int k)
{
if (p[x].c - 1 - y >= k)
{
for (int i = 0, j = y + 1; i < k; ++i, ++j)
cout << p[x].s[j];
cout << endl;
return;
}
k -= p[x].c - y - 1;
for (int i = y + 1; i < p[x].c; ++i)
cout << p[x].s[i];
int cur = x;
while (p[cur].r && k >= p[p[cur].r].c)
{
int u = p[cur].r;
for (int i = 0; i < p[u].c; ++i)
cout << p[u].s[i];
k -= p[u].c;
cur = u;
}
int u = p[cur].r;
for (int i = 0; i < k; ++i)
cout << p[u].s[i];
cout << endl;
}
void pre()
{
if (!y)
{
x = p[x].l;
y = p[x].c - 1;
}
else
y--;
}
void nxt()
{
if (y < p[x].c - 1)
y++;
else
{
x = p[x].r;
y = 0;
}
}
void merge()
{
for (int i = p[0].r; i; i = p[i].r)
while (p[i].r && p[i].c + p[p[i].r].c < N)
{
int r = p[i].r;
for (int j = p[i].c, k = 0; k < p[r].c; ++j, ++k)
p[i].s[j] = p[r].s[k];
if (x == r)
x = i, y += p[i].c;
p[i].c += p[r].c;
del(r);
}
}
int main()
{
for (int i = 1; i < M; ++i)
q.push(i);
cin >> n;
char op[10];
str[0] = '>';
insert(1);
move(1);
while (n--)
{
int a;
cin >> op;
if (!strcmp(op, "Move"))
{
cin >> a;
move(a + 1);
}
else if (!strcmp(op, "Insert"))
{
cin >> a;
int i = 0, k = a;
while (a)
{
str[i] = getchar();
if (str[i] >= 32 && str[i] <= 126)
i++, a--;
}
insert(k);
merge();
}
else if (!strcmp(op, "Delete"))
{
cin >> a;
remove(a);
merge();
}
else if (!strcmp(op, "Get"))
{
cin >> a;
get(a);
}
else if (!strcmp(op, "Prev"))
pre();
else
nxt();
}
return 0;
}
|