Cod sursa(job #2493838)

Utilizator armigheGheorghe Liviu Armand armighe Data 16 noiembrie 2019 23:48:51
Problema Arbore Scor 0
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 1.63 kb
#include<fstream>
#include<vector>
#include<cmath>
#include<bitset>
using namespace std;
ifstream f("arbore.in");
ofstream g("arbore.out");
vector<int>a[100002];
int v[100002],dim[100002],k,poz[100002],r,s[100002],w[100002],n;
bool fv[320][100002];
void dfs(int x,int tata)
{
    int i,l=a[x].size();
    v[++k]=x;
    poz[x]=k;
    dim[x]=1;
    for(i=0;i<l;i++)
    if(a[x][i]!=tata)
    {
        dfs(a[x][i],x);
        dim[x]+=dim[a[x][i]];
    }
}

void update(int x,int y)
{
    x=poz[x];
    int i,st=(x-1)/r+1,dr=(x+dim[x]-1-1)/r+1;
    for(i=st+1;i<=dr-1;i++)
        s[i]+=y;
    for(i=x;i<=st*r;i++)
    {
       // fv[st][w[v[i]]]=0;
        w[v[i]]+=y;
        fv[st][w[v[i]]]=1;
    }
    if(st!=dr)
    for(i=(dr-1)*r+1;i<=x+dim[x]-1;i++)
    {
        //fv[dr][w[v[i]]]=0;
        w[v[i]]+=y;
        fv[dr][w[v[i]]]=1;
    }
}

int query(int x)
{
    int i,j;
    for(i=1;i<=r;i++)
    if(fv[i][x-s[i]]!=0)
    {
        for(j=(i-1)*r+1;j<=i*r;j++)
        if(w[v[j]]+s[i]==x)
            return v[j];
    }
    for(i=r*r+1;i<=n;i++)
    if(w[v[i]]==x)
        return v[i];
    return -1;
}

int main()
{
    int m,x,y,p,i;
    f>>n>>m;
    for(i=1;i<n;i++)
    {
        f>>x>>y;
        a[x].push_back(y);
        a[y].push_back(x);
    }
    dfs(1,0);
    r=sqrtl(n);
    for(i=1;i<=r;i++)
        fv[i][0]=r;
    fv[r+1][0]=n-r*r;
    for(i=1;i<=m;i++)
    {
        f>>p;
        if(p==1)
        {
            f>>x>>y;
            update(x,y);
        }
        else
        {
            f>>x;
            g<<query(x)<<'\n';
        }
    }
    return 0;
}