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Cod sursa(job #515123)
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <vector>
using namespace std;
#define file_in "arbore.in"
#define file_out "arbore.out"
#define Nmax 101000
#define pb push_back
int n,m,p,s,c[Nmax];
vector<int> v[Nmax];
int a,b;
int j,tip;
int viz[Nmax];
void dfs(int nod)
{
int i;
//vector<int> :: iterator it;
if (viz[nod]) return ;
c[nod]+=s;
viz[nod]=1;
for (i=0;i<v[nod].size();++i)
if (!viz[v[nod][i]])
dfs(v[nod][i]);
}
int main()
{
int i ;
freopen(file_in,"r",stdin);
freopen(file_out,"w",stdout);
scanf("%d %d", &n,&m);
for (i=1;i<n;++i)
{
scanf("%d %d", &a,&b);
if (a<b)
v[a].pb(b);
else
v[b].pb(a);
}
memset(c,0,sizeof(c));
while(m--)
{
scanf("%d", &tip);
if (tip==1)
{
memset(viz,0,sizeof(viz));
scanf("%d %d", &p, &s);
dfs(p);
/*for(i=1;i<=n;++i)
printf("%d ", c[i]);
printf("\n");*/
}
else
if (tip==2)
{
int ok=1;
scanf("%d", &s);
for (i=1;i<=n && ok;++i)
if (c[i]==s)
printf("%d\n",i),
ok=0;
if (ok) printf("-1\n");
}
}
fclose(stdin);
fclose(stdout);
return 0;
}