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Cod sursa(job #761957)
#include <fstream>
#include <bitset>
#include <vector>
#define DIM 100001
#define DIM_S 1000001
#define DIM_RAD 400
using namespace std;
ifstream fin("arbore.in");
ofstream fout("arbore.out");
int n, q, pas, rad;
vector<int> G[DIM];
int in[DIM], out[DIM], mart[DIM];
int c[DIM], a[DIM];
bitset<DIM_S> p[DIM_RAD];
void Read();
void DF(int nod);
void Update2(int grup, int st, int dr, int s);
void Update(int st, int dr, int s);
int Query(int s);
int main()
{
Read();
DF(1);
for (rad = 1; rad * rad < n; ++rad);
for (int i = 1; i <= rad; ++i)
p[i][0] = 1;
rad++;
int nod, s, k;
while (q--)
{
fin >> k;
if (k == 1)
{
fin >> nod >> s;
Update(in[nod], out[nod], s);
}
else
{
fin >> s;
fout << Query(s) << '\n';
}
}
fin.close();
fout.close();
return 0;
}
void Read()
{
fin >> n >> q;
int x, y;
for (int i = 1; i < n; ++i)
{
fin >> x >> y;
G[x].push_back(y);
G[y].push_back(x);
}
}
void DF(int nod)
{
if (in[nod]) return;
in[nod] = ++pas;
mart[pas] = nod;
for (int i = 0; i < G[nod].size(); ++i)
{
int son = G[nod][i];
if (in[son]) continue;
DF(son);
}
out[nod] = pas;
}
void Update(int st, int dr, int s)
{
int rad1, rad2;
rad1 = (st-1) / rad + 1;
rad2 = (dr-1) / rad + 1;
if (rad1 != rad2)
{
Update2(rad1, st, rad1 * rad, s);
Update2(rad2, (rad2-1)*rad + 1, dr, s);
for (int i = rad1 + 1; i < rad2; ++i)
c[i] += s;
return;
}
Update2(rad1, st, dr, s);
}
void Update2(int grup, int st, int dr, int s)
{
for (int i = st; i <= dr; ++i)
{
p[grup][a[i]] = 0;
a[i] += s;
}
for (int i = (grup-1) * rad + 1; i <= rad * grup && i <= n; ++i)
p[grup][a[i]] = 1;
}
int Query(int s)
{
for (int i = 1; i <= rad; ++i)
if (c[i] <= s && p[i][s - c[i]])
for (int j = (i-1) * rad + 1; j <= n && j <= rad * i; ++j)
if (a[j] == s - c[i]) return mart[j];
return -1;
}