Pagini recente » Cod sursa (job #1391687) | Cod sursa (job #1872546) | Cod sursa (job #1020374) | Cod sursa (job #1090975) | Cod sursa (job #2438083)
#include <bits/stdc++.h>
using namespace std;
ifstream in("arbore.in");
ofstream out("arbore.out");
const int N = 1e5+5;
const int R = 355;
vector<int> v[N];
int a[N],c[R],n,m;
bool p[R][1000005],viz[N];
int st[N],sf[N],el[N],ind;
void dfs(int x)
{
viz[x] = 1;
st[x] = ++ind;
el[ind] = x;
for (auto it: v[x])
if (!viz[it])
dfs(it);
sf[x] = ind;
}
int block(int k)
{
int poz = k/R;
if (k%R != 0)
poz++;
return poz;
}
void update(int l, int r, int val)
{
int beg = block(l);
for (int i = (beg-1)*R+1; i<=r && i<=beg*R; i++)
p[beg][a[i]] = 0;
for (int i = l; i<=r && i<=beg*R; i++)
a[i]+=val;
for (int i = (beg-1)*R+1; i<=r && i<=beg*R; i++)
p[beg][a[i]] = 1;
if (beg == block(r))
return;
while (beg<block(r))
c[beg++]+=val;
for (int i = (beg-1)*R+1; i<=r && i<=beg*R; i++)
p[beg][a[i]] = 0;
for (int i = (beg-1)*R+1; i<=r; i++)
a[i]+=val;
for (int i = (beg-1)*R+1; i<=r && i<=beg*R; i++)
p[beg][a[i]] = 1;
}
int query(int val)
{
for (int i = 1; i<block(n); i++)
if (val>=c[i] && p[i][val-c[i]])
{
for (int j = (i-1)*R+1; j<=i*R; j++)
if (a[j] == val-c[i])
return el[j];
}
for (int i = (block(n)-1)*R+1; i<=n; i++)
if (a[i] == val-c[block(n)])
return el[i];
return -1;
}
int main()
{
in >> n >> m;
for (int i = 1; i<n; i++)
{
int x,y;
in >> x >> y;
v[x].push_back(y);
v[y].push_back(x);
}
dfs(1);
for (int i = 1; i<=m; i++)
{
int t;
in >> t;
if (t == 1)
{
int k,val;
in >> k >> val;
update(st[k],sf[k],val);
}
else
{
int val;
in >> val;
out << query(val) << "\n";
}
}
}