#include <bits/stdc++.h>
using namespace std;
struct node
{
int v, l, r;
char c;
};
int all, ver;
int root[1000005];
node seg[26000000];
int build(int l, int r)
{
int now = ++all;
if(l == r) return now;
int mid = (l+r)>>1;
int L = build(l, mid), R = build(mid+1, r);
seg[now] = {0, L, R};
return now;
}
void Init() {
root[0] = build(1, 1000000);
}
int update(int idx, int l, int r, int p, char c) {
if(!(l <= p && p <= r)) return idx;
int now = ++all;
if(l == r)
{
seg[now].v = 1;
seg[now].c = c;
return now;
}
int mid = (l+r)>>1;
int L = update(seg[idx].l, l, mid, p, c), R = update(seg[idx].r, mid+1, r, p, c);
seg[now].l = L, seg[now].r = R, seg[now].v = seg[L].v+seg[R].v;
return now;
}
void TypeLetter(char L) {
ver++;
root[ver] = update(root[ver-1], 1, 1000000, seg[root[ver-1]].v+1, L);
}
void UndoCommands(int U) {
ver++;
root[ver] = root[ver-U-1];
}
char query(int idx, int l, int r, int p)
{
if(l == r) return seg[idx].c;
int mid = (l+r)>>1;
return (p <= mid) ? query(seg[idx].l, l, mid, p) : query(seg[idx].r, mid+1, r, p);
}
char GetLetter(int P) {
return query(root[ver], 1, 1000000, P+1);
}
int main()
{
int q;
cin >> q;
while(q--)
{
char op;
cin >> op;
if(op == 'T')
{
char c;
cin >> c;
TypeLetter(c);
}
else if(op == 'P')
{
int d;
cin >> d;
cout << GetLetter(d) << endl;
}
else
{
int d;
cin >> d;
UndoCommands(d);
}
}
}
Compilation message
/tmp/ccO8ry04.o: In function `main':
scrivener.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccbshBe2.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
