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Cod sursa(job #843249)
#include <cstdio>
#include <vector>
#define MAXN 100001
#define ARBSIZE 262145
#define maxim(a,b) (a>b?a:b)
using std::vector;
int n, m, euler[MAXN], ep, start[MAXN], end[MAXN], x, y;
char color[MAXN];
bool found;
int max[ARBSIZE], inc[ARBSIZE];
vector<int> G[MAXN];
void dfs(int node)
{
euler[++ep] = node;
start[node] = ep;
color[node] = 1;
int len = G[node].size();
for (int i = 0 ; i < len ; ++i)
if (color[G[node][i]] == 0)
dfs(G[node][i]);
end[node] = ep;
}
void update(int node, int left, int right)
{
if (start[x] <= left && right <= end[x])
inc[node] += y;
else
{
int mid = (left + right) >> 1;
if (start[x] <= mid)
update(node << 1, left, mid);
if (end[x] > mid)
update((node << 1) + 1, mid + 1, right);
}
if (left == right)
max[node] = inc[node];
else
max[node] = maxim(max[node << 1], max[(node << 1) + 1]) + inc[node];
}
void query(int node, int left, int right)
{
x -= inc[node];
if (x == 0)
{
found = true;
printf("%d\n", euler[left]);
}
else if (left != right && x > 0 && max[node] - inc[node] >= x)
{
int mid = (left + right) >> 1;
query(node << 1, left, mid);
if (!found)
query((node << 1) + 1, mid + 1, right);
}
x += inc[node];
}
int main()
{
freopen("arbore.in", "r", stdin);
freopen("arbore.out","w",stdout);
scanf("%d %d", &n, &m);
for (int i = 1 ; i < n ; ++i)
{
int a, b;scanf("%d %d", &a, &b);
G[a].push_back(b);
G[b].push_back(a);
}
dfs(1);
for (int i = 1 ; i <= m ; ++i)
{
int command; scanf("%d %d", &command, &x);
if (command == 1)
{
scanf("%d", &y);
update(1, 1, n);
}
else
{
found = false;
query(1, 1, n);
if (!found)
printf("%d\n", -1);
}
}
return 0;
}