oj.uz

답안 #1100651

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1100651 2024-10-14T11:42:06 Z not_amir Petrol stations (CEOI24_stations) C++14
55 / 100
 1907 ms 2097152 KB 
#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O3")

typedef pair<int, int> pii;
typedef long long ll;

int INF;

struct Vertex {
    Vertex* l, * r;
    ll sum;

    Vertex(ll val) : l(nullptr), r(nullptr), sum(val) {}
    Vertex(Vertex* l, Vertex* r) : l(l), r(r), sum(0) {
        if (l) sum += l->sum;
        if (r) sum += r->sum;
    }

    void extend(){
        if(!l)
            l = new Vertex(0);
        if(!r)
            r = new Vertex(0);
    }
};

ll get_sum(Vertex* v, ll tl, ll tr, ll l, ll r) {
    if (l + 1 > r)
        return 0;
    if (l == tl && tr == r)
        return v->sum;
    if(v->l == nullptr)
        return 0;
    ll tm = (tl + tr) / 2;
    return get_sum(v->l, tl, tm, l, min(r, tm))
        + get_sum(v->r, tm, tr, max(l, tm), r);
}

void update(Vertex* v, ll tl, ll tr, ll pos, int new_val) {
    if (tl + 1 == tr){
        v->sum += new_val;
        return;
    }
    v->extend();
    ll tm = (tl + tr) / 2;
    if (pos < tm)
        update(v->l, tl, tm, pos, new_val);
    else
        update(v->r, tm, tr, pos, new_val);
    v->sum = v->l->sum + v->r->sum;
}

vector<vector<pii>> G;
vector<bool> is_removed;
vector<int> subsize;

int get_subtree_size(int v, int p = -1) {
    subsize[v] = 1;
    for (auto [u, w] : G[v]) {
        if (u == p || is_removed[u]) { continue; }
        subsize[v] += get_subtree_size(u, v);
    }
    return subsize[v];
}

int get_centroid(int v, int S, int p = -1) {
    for (auto [u, w] : G[v]) {
        if (u == p || is_removed[u]) { continue; }
        if (subsize[u] * 2 > S) {
            return get_centroid(u, S, v);
        }
    }
    return v;
}

int k;

vector<ll> ans, res, jumpw, parw;
vector<int> depth, jump, par;

vector<Vertex*> st;

void dfs1(Vertex* stt, int v, int p, int d, int child, int S) {
    depth[v] = d;
    res[v] = 0;
    if(p != -1) {
        if(depth[jump[p]] - depth[p] == depth[jump[jump[p]]] - depth[jump[p]])
            jump[v] = jump[jump[p]], jumpw[v] = jumpw[jump[p]] + jumpw[p] + parw[v];
        else
            jump[v] = p, jumpw[v] = parw[v];
    }
    for(auto [u, w] : G[v]) {
        if(u == p || is_removed[u])
            continue;
        par[u] = v, parw[u] = w;
        if(p == -1)
            st[u] = new Vertex(0);
        dfs1(stt, u, v, d + 1, p==-1?u:child, S);
    }
    if(p != -1) {
        int a = v;
        ll s = 0;
        ans[v] += res[v] * (S - subsize[child]);
        while(jump[a] != a && s + parw[a] <= k) {
            if(jumpw[a] + s <= k)
                s += jumpw[a], a = jump[a];
            else
                s += parw[a], a = par[a];
        }
        if(jump[a] == a) {
            update(stt, 0, INF, k - s, res[v] + 1);
            update(st[child], 0, INF, k - s, res[v] + 1);
        }
        else
            res[a] += res[v] + 1;
    }
}

void dfs2(Vertex* stt, int v, int p, ll s, int child) {
    for(auto [u, w] : G[v]) {
        if(u == p || is_removed[u])
            continue;
        if(p == -1)
            child = u;
        int refuel = get_sum(stt, 0, INF, s, s + w);
        refuel -= get_sum(st[child], 0, INF, s, s + w);
        ans[v] += refuel * subsize[u];
        update(stt, 0, INF, s + k, refuel);
        dfs2(stt, u, v, s + w, child);
        update(stt, 0, INF, s + k, -refuel);
    }
}

void centroid_decomp(int v = 0) {
    int centroid = get_centroid(v, get_subtree_size(v));

    Vertex* stt = new Vertex(0);

    jump[centroid] = centroid;
    jumpw[centroid] = 0;
    dfs1(stt, centroid, -1, 0, 0, get_subtree_size(centroid));
    update(stt, 0, INF, k, 1);
    dfs2(stt, centroid, -1, 0, 0);

    is_removed[centroid] = true;

    for (auto [u, w] : G[centroid]) {
        if (is_removed[u]) { continue; }
        centroid_decomp(u);
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n >> k;
    INF = n * k;
    G.resize(n);
    is_removed.resize(n);
    subsize.resize(n);
    par.resize(n);
    parw.resize(n);
    jump.resize(n);
    jumpw.resize(n);
    ans.resize(n);
    res.resize(n);
    depth.resize(n);
    st.resize(n);
    for(int i = 0; i < n - 1; i++) {
        int u, v, l;
        cin >> u >> v >> l;
        G[u].push_back({v, l});
        G[v].push_back({u, l});
    }
    centroid_decomp();
    for(int i = 0; i < n; i++)
        cout << ans[i] << '\n';
}

Compilation message

Main.cpp: In function 'int get_subtree_size(int, int)':
Main.cpp:61:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   61 |     for (auto [u, w] : G[v]) {
      |               ^
Main.cpp: In function 'int get_centroid(int, int, int)':
Main.cpp:69:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   69 |     for (auto [u, w] : G[v]) {
      |               ^
Main.cpp: In function 'void dfs1(Vertex*, int, int, int, int, int)':
Main.cpp:94:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   94 |     for(auto [u, w] : G[v]) {
      |              ^
Main.cpp: In function 'void dfs2(Vertex*, int, int, ll, int)':
Main.cpp:122:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  122 |     for(auto [u, w] : G[v]) {
      |              ^
Main.cpp: In function 'void centroid_decomp(int)':
Main.cpp:149:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  149 |     for (auto [u, w] : G[centroid]) {
      |               ^

Subtask #0
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 9 ms 4688 KB Output is correct
4 Correct 8 ms 3408 KB Output is correct
5 Correct 9 ms 4176 KB Output is correct
6 Correct 14 ms 6992 KB Output is correct
7 Correct 7 ms 2896 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 8 ms 4688 KB Output is correct
10 Correct 9 ms 4856 KB Output is correct
11 Correct 9 ms 4864 KB Output is correct
12 Correct 8 ms 4688 KB Output is correct
13 Correct 8 ms 4688 KB Output is correct
14 Correct 4 ms 2896 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 673 ms 190460 KB Output is correct

Subtask #3
0.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 673 ms 190460 KB Output is correct
5 Runtime error 1907 ms 2097152 KB Execution killed with signal 9
6 Halted 0 ms 0 KB -

Subtask #4
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 613 ms 188408 KB Output is correct
4 Correct 827 ms 236996 KB Output is correct
5 Correct 767 ms 186800 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 656 ms 212744 KB Output is correct
8 Correct 677 ms 212196 KB Output is correct
9 Correct 627 ms 212296 KB Output is correct

Subtask #5
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 613 ms 188408 KB Output is correct
4 Correct 827 ms 236996 KB Output is correct
5 Correct 767 ms 186800 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 656 ms 212744 KB Output is correct
8 Correct 677 ms 212196 KB Output is correct
9 Correct 627 ms 212296 KB Output is correct
10 Correct 446 ms 190460 KB Output is correct
11 Correct 516 ms 188884 KB Output is correct
12 Correct 470 ms 179792 KB Output is correct
13 Correct 533 ms 200736 KB Output is correct
14 Correct 492 ms 200596 KB Output is correct
15 Correct 485 ms 201464 KB Output is correct
16 Correct 223 ms 165824 KB Output is correct

Subtask #6
0.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 9 ms 4688 KB Output is correct
4 Correct 8 ms 3408 KB Output is correct
5 Correct 9 ms 4176 KB Output is correct
6 Correct 14 ms 6992 KB Output is correct
7 Correct 7 ms 2896 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 8 ms 4688 KB Output is correct
10 Correct 9 ms 4856 KB Output is correct
11 Correct 9 ms 4864 KB Output is correct
12 Correct 8 ms 4688 KB Output is correct
13 Correct 8 ms 4688 KB Output is correct
14 Correct 4 ms 2896 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 673 ms 190460 KB Output is correct
17 Runtime error 1907 ms 2097152 KB Execution killed with signal 9
18 Halted 0 ms 0 KB -