oj.uz

Submission #896209

# Submission time Handle Problem Language Result Execution time Memory
896209 2024-01-01T02:41:09 Z 12345678 Tree Rotations (POI11_rot) C++17
0 / 100
 133 ms 20764 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=4e5+5, fx=2e5+5;
int n, cnt, t, x, sz[nx], p[nx], c;
vector<int> d[nx];

struct fenwick
{
    int d[fx];
    void add(int i, int vl)
    {
        while (i<fx) d[i]+=vl, i+=(i&-i);
    }
    int query(int i)
    {
        int res=0;
        while (i>0) res+=d[i], i-=(i&-i);
        return res;
    }
} f;

void dfssz(int u)
{
    sz[u]=1;
    for (auto v:d[u]) dfssz(v), sz[u]+=sz[v];
    //cout<<u<<' '<<sz[u]<<'\n';
}

pair<int, int> dfsvl(int u)
{
    if (u<=n) return make_pair(f.query(u-1), f.query(fx-1)-f.query(u));
    auto l=dfsvl(d[u][0]), r=dfsvl(d[u][1]);
    return make_pair(l.first+r.first, l.second+r.second);
}

void dfsrem(int u)
{
    if (u<=n) return void(f.add(u, -1));
    dfsrem(d[u][0]);
    dfsrem(d[u][1]);
}

void dfsadd(int u)
{
    if (u<=n) return void(f.add(u, 1));
    dfsadd(d[u][0]);
    dfsadd(d[u][1]);
}

int solve(int u, bool del)
{
    if (u<=n&&!del) f.add(u, 1);
    if (u<=n) return 0;
    if (sz[d[u][0]]<sz[d[u][1]]) swap(d[u][0], d[u][1]);
    int res=solve(d[u][1], 1)+solve(d[u][0], 0);
    auto tmp=dfsvl(d[u][1]);
    if (del) dfsrem(u);
    else dfsadd(d[u][1]);
    //cout<<u<<' '<<res<<' '<<tmp.first<<' '<<tmp.second<<' '<<min(tmp.first, tmp.second)<<'\n';
    return res+min(tmp.first, tmp.second);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>x;
    t=c=n+1;
    while (cnt!=n)
    {
        cin>>x;
        if (!x) d[c].push_back(++t), p[t]=c, c=t;
        else 
        {
            d[c].push_back(x); cnt++;
            while (d[c].size()==2) c=p[c];
        }
    }
    dfssz(n+1);
    cout<<solve(n+1, 0);
}

/*
5
0
0
0
5
1
2
0
4
3
*/

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 12636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 12636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 12636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 12892 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 13656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 40 ms 14428 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 19032 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 49 ms 16988 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 133 ms 20764 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 82 ms 20444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 92 ms 20420 KB Output isn't correct
2 Halted 0 ms 0 KB -