TTRAVEL - Time Travel
Tác giả: ll931110
Ngôn ngữ: C++
#include <algorithm>
#include <bitset>
#include <cstring>
#include <deque>
#include <fstream>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
int id[100010],pre[100010];
int main()
{
// freopen("travel.in","r",stdin);
// freopen("travel.ou","w",stdout);
int n;
scanf("%d", &n);
id[0] = -1; pre[0] = -1;
for (int i = 1; i <= n; i++)
{
char ch;
do
{
scanf("%c", &ch);
}
while (ch != 's' && ch != 't' && ch != 'a');
if (ch == 'a')
{
int k;
scanf("%d", &k);
id[i] = k; pre[i] = i - 1;
};
if (ch == 's')
{
id[i] = id[pre[i - 1]];
pre[i] = pre[pre[i - 1]];
};
if (ch == 't')
{
int k;
scanf("%d", &k);
pre[i] = pre[k - 1];
id[i] = id[k - 1];
};
printf("%d\n", id[i]);
};
};