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Cod sursa(job #631792)
# include <algorithm>
# include <cstdio>
# include <cstring>
# include <string>
using namespace std;
#define DN 100005
using namespace std;
string V[DN], P[DN];
pair <int, string> Q[DN];
int N, L, T, A[DN], U[DN];
struct cmp
{
bool operator() (const string &a, const string &b) const
{
if(a.size() == b.size())
return a.compare(b) < 0;
return a.size() < b.size();
}
};
inline int lsb(int x)
{
return (x & -x);
}
void update(int poz)
{
for(; poz <= N; poz += lsb(poz))
++A[poz];
}
int sum(int poz)
{
int rez = 0;
for(; poz; poz -= lsb(poz))
rez += A[poz];
return rez;
}
int main()
{
freopen("nums.in","rt",stdin);
freopen("nums.out","wt",stdout);
scanf("%d\n", &N);
for(int i = 1; i <= N; ++i)
{
char buf[DN];
fgets(buf, DN, stdin);
int m = strlen(buf);
if(buf[m-1] == '\n') buf[m-1] = 0;
string s = string(buf+2);
if(buf[0] == '1')
{
V[++L] = s;
Q[++T] = make_pair(1, s);
}
else
Q[++T] = make_pair(2, s);
}
sort(V+1, V+L+1, cmp());
P[N = 1] = V[1];
for(int i = 2; i <= L; ++i)
if(V[i] != P[N])
P[++N] = V[i];
for(int i = 1; i <= T; ++i)
{
int op = Q[i].first;
string s = Q[i].second;
if(op == 1)
{
int poz = lower_bound(P+1, P+N+1, s, cmp()) - P;
if(U[poz]) continue;
U[poz] = 1;
update(poz);
}
if(op == 2)
{
int k = 0;
for(size_t j = 0; j < s.size(); ++j)
k = k * 10 + s[j] - '0';
int lg = (1 << 17), i = 0;
for(; lg; lg >>= 1)
if(i + lg <= N && sum(i + lg) < k)
i += lg;
printf("%s\n", P[i+1].c_str());
}
}
}