oj.uz

답안 #839568

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
839568 2023-08-30T08:59:43 Z model_code Truck Driver (IOI23_deliveries) C++17
100 / 100
 1439 ms 39968 KB 
// correct/sol_na_full.cpp

#include "deliveries.h"
#include <cstdlib>
#include <iostream>
#include <cassert>
#include<cmath>

using std::cerr;

#define xx first
#define yy second

using ll = long long;

class solver {
    struct segtree {
        struct node {
            ll max_subtree_w;
            ll sum_wdotd, sum_d;
            ll lazy;

            node() : max_subtree_w(0), sum_wdotd(0), sum_d(0), lazy(0) {}

            void apply_lazy() {
                max_subtree_w += lazy;
                sum_wdotd += sum_d * lazy;
            }

            node operator+(const node& other) const {
                node res = *this;
                res.max_subtree_w = std::max(res.max_subtree_w, other.max_subtree_w);
                res.sum_wdotd = res.sum_wdotd + other.sum_wdotd;
                res.sum_d = res.sum_d + other.sum_d;

                return res;
            }
        };

        std::vector<node> tree;

        segtree() {}
        segtree(int N) {
            tree.resize(4*N);
        }

        void build(int ind, int L, int R, std::vector<ll>& W, std::vector<ll>& D) {
            if(L==R) {
                tree[ind].max_subtree_w = W[L];
                tree[ind].sum_d = D[L];
                tree[ind].sum_wdotd = (ll)D[L]*W[L];
                return ;
            }else {
                build(2*ind, L, (L+R)/2, W, D);
                build(2*ind+1, (L+R)/2+1, R, W, D);

                tree[ind] = std::move(tree[2*ind]+tree[2*ind+1]);
                return ;
            }
        }

        void push(int ind, int L, int R) {
            if(tree[ind].lazy!=0) {
                if(L!=R) {
                    tree[2*ind].lazy+=tree[ind].lazy;
                    tree[2*ind+1].lazy+=tree[ind].lazy;
                }

                tree[ind].apply_lazy();
                tree[ind].lazy=0;
            }
        }
        
        node query(int ind, int L, int R, int i, int j) {
            push(ind, L, R);
            if(R<i || j<L) return node();
            if(i<=L && R<=j) return tree[ind];
            int mid=(L+R)/2;
            if(mid<i) 
                return query(2*ind+1, mid+1, R, i, j);
            else if(j<=mid)
                return query(2*ind, L, mid, i, j);
            else
                return query(2*ind, L, mid, i, j) + query(2*ind+1, mid+1, R, i, j);
        }
        
        void update(int ind, int L, int R, int i, int j, ll by) {
            push(ind, L, R);
            if(R<i || j<L) return ;
            if(i<=L && R<=j) {
                tree[ind].lazy+=by;
                push(ind, L, R);
                return ;
            }
            update(2*ind, L, (L+R)/2, i, j, by);
            update(2*ind+1, (L+R)/2+1, R, i, j, by);
            tree[ind]=std::move(tree[2*ind]+tree[2*ind+1]);
        }

        int find_last(int ind, int L, int R, ll val) {
            push(ind, L, R);
            if(L!=R) {
                push(2*ind, L, (L+R)/2);
                push(2*ind+1, (L+R)/2+1, R);
            }

            if(L==R) return L;
            if(2*tree[2*ind+1].max_subtree_w>=val) {
                return find_last(2*ind+1, (L+R)/2+1, R, val);
            }
            return find_last(2*ind, L, (L+R)/2, val);
        }
    };

    int N;
    std::vector<std::vector<std::pair<int,int>>> adj;
    std::vector<int> W;

    std::vector<int> sz, hld_nxt, par, par_D;
    std::vector<ll> subtree_sum;
    void dfs_sz(int x) {
        par[x]=-1;
        subtree_sum[x]=W[x];
        sz[x]=1;

        hld_nxt[x]=-1;
        
        for(auto i:adj[x]) {
            if(!sz[i.xx]) {
                dfs_sz(i.xx);
                
                par_D[i.xx]=i.yy;
                subtree_sum[x]+=subtree_sum[i.xx];
                par[i.xx]=x;
                sz[x]+=sz[i.xx];

                if(hld_nxt[x]==-1 || sz[i.xx]>sz[hld_nxt[x]]) {
                    hld_nxt[x]=i.xx;
                }
            }
        }
    }

    std::vector<int> hld, hld_id, hld_head, hld_inv;
    int hld_pos, hld_next_id;
    void dfs_hld(int x) {
        hld[x]=hld_pos++;
        hld_inv[hld_pos-1]=x;
        hld_id[x]=hld_next_id;
        if(hld_nxt[x]!=-1) {
            dfs_hld(hld_nxt[x]);
            
            for(auto i:adj[x]) {
                if(hld_nxt[x]!=i.xx && par[i.xx]==x) {
                    hld_next_id++;
                    dfs_hld(i.xx);
                }
            }
        }
        
        hld_head[hld_id[x]]=x;
    }

    segtree st;
    ll sum_w=0;
    int lg;
public:
    solver() {}

    solver(int N, std::vector<int> U_, std::vector<int> V_, std::vector<int> T_, std::vector<int> W_) : N(N), hld_pos(0), hld_next_id(0) {
        lg = log2(N)+1;
        adj.resize(N);
        for(int i=0;i<N-1;++i) {
            adj[U_[i]].push_back({V_[i], T_[i]});
            adj[V_[i]].push_back({U_[i], T_[i]});
        }
        W = std::move(W_);
        W[0]++;
        for(int w:W) sum_w+=w;

        subtree_sum.assign(N, 0);
        sz.assign(N, 0);
        hld_nxt.assign(N, 0);
        par.assign(N, -1);
        par_D.assign(N, 0);

        dfs_sz(0);
        hld.assign(N, -1);
        hld_id.assign(N, -1);
        hld_inv.assign(N, -1);
        hld_head.assign(N, -1);
        dfs_hld(0);

        st = segtree(N);
        std::vector<ll> subtree_sum_hld(N), par_D_hld(N);
        for(int i=0;i<N;++i) {
            subtree_sum_hld[hld[i]]=subtree_sum[i];
            par_D_hld[hld[i]]=par_D[i];
        }

        st.build(1,0,N-1, subtree_sum_hld, par_D_hld);
    }

    // (sum_w-subtreeSumW[i])*par_d[i] a centroidig a többi subtreeSumW[i]*par_d[i]
    // 3 * 0 + 1 * 1 - 
    ll calc_answer(ll p) {
        ll ans = st.query(1, 0, N-1, 0, N-1).sum_wdotd;
        while(1) {
            ans += -2*st.query(1, 0, N-1,  hld[hld_head[hld_id[p]]], hld[p]).sum_wdotd
                   + st.query(1, 0, N-1,  hld[hld_head[hld_id[p]]], hld[p]).sum_d * sum_w;
            p = par[hld_head[hld_id[p]]];
            if(p<0) break ;
        }

        return ans;
    }

    ll change(ll p, ll new_w) {
        if(p==0) new_w++;
        ll prv_w = W[p];
        ll change = new_w - prv_w;
        W[p] = new_w;
        sum_w+=change;
        while(1) {
            st.update(1, 0, N-1, hld[hld_head[hld_id[p]]], hld[p], change);
            p = par[hld_head[hld_id[p]]];
            if(p<0) break ;
        }
        
        return 2*calc_answer(hld_inv[st.find_last(1,0,N-1,sum_w)]);
    }
};

solver s;

void init(int N, std::vector<int> U, std::vector<int> V, std::vector<int> T, std::vector<int> W) {
    s = solver(N, U, V, T, W);
}

long long max_time(int X, int Y) {
    return s.change(X, Y);
}

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 77 ms 7672 KB Output is correct
2 Correct 77 ms 7372 KB Output is correct
3 Correct 91 ms 7584 KB Output is correct
4 Correct 77 ms 7612 KB Output is correct
5 Correct 89 ms 7624 KB Output is correct

Subtask #2
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 360 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 596 KB Output is correct
7 Correct 2 ms 596 KB Output is correct
8 Correct 2 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 4 ms 596 KB Output is correct
12 Correct 2 ms 596 KB Output is correct
13 Correct 2 ms 640 KB Output is correct
14 Correct 2 ms 596 KB Output is correct
15 Correct 2 ms 596 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 77 ms 7672 KB Output is correct
2 Correct 77 ms 7372 KB Output is correct
3 Correct 91 ms 7584 KB Output is correct
4 Correct 77 ms 7612 KB Output is correct
5 Correct 89 ms 7624 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 5 ms 596 KB Output is correct
8 Correct 98 ms 3884 KB Output is correct
9 Correct 1397 ms 32744 KB Output is correct
10 Correct 1439 ms 32776 KB Output is correct
11 Correct 1172 ms 32748 KB Output is correct
12 Correct 849 ms 34156 KB Output is correct
13 Correct 833 ms 34148 KB Output is correct
14 Correct 848 ms 34152 KB Output is correct

Subtask #4
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 77 ms 7672 KB Output is correct
2 Correct 77 ms 7372 KB Output is correct
3 Correct 91 ms 7584 KB Output is correct
4 Correct 77 ms 7612 KB Output is correct
5 Correct 89 ms 7624 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 3 ms 596 KB Output is correct
8 Correct 29 ms 4360 KB Output is correct
9 Correct 394 ms 38128 KB Output is correct
10 Correct 341 ms 38092 KB Output is correct
11 Correct 357 ms 38088 KB Output is correct
12 Correct 446 ms 39968 KB Output is correct
13 Correct 321 ms 39880 KB Output is correct
14 Correct 269 ms 38104 KB Output is correct

Subtask #5
36.0 / 36.0

# 결과 실행 시간 메모리 Grader output
1 Correct 77 ms 7672 KB Output is correct
2 Correct 77 ms 7372 KB Output is correct
3 Correct 91 ms 7584 KB Output is correct
4 Correct 77 ms 7612 KB Output is correct
5 Correct 89 ms 7624 KB Output is correct
6 Correct 1 ms 360 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 596 KB Output is correct
10 Correct 2 ms 596 KB Output is correct
11 Correct 2 ms 596 KB Output is correct
12 Correct 2 ms 596 KB Output is correct
13 Correct 2 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 4 ms 596 KB Output is correct
17 Correct 2 ms 596 KB Output is correct
18 Correct 2 ms 640 KB Output is correct
19 Correct 2 ms 596 KB Output is correct
20 Correct 2 ms 596 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 5 ms 596 KB Output is correct
23 Correct 98 ms 3884 KB Output is correct
24 Correct 1397 ms 32744 KB Output is correct
25 Correct 1439 ms 32776 KB Output is correct
26 Correct 1172 ms 32748 KB Output is correct
27 Correct 849 ms 34156 KB Output is correct
28 Correct 833 ms 34148 KB Output is correct
29 Correct 848 ms 34152 KB Output is correct
30 Correct 1 ms 212 KB Output is correct
31 Correct 3 ms 596 KB Output is correct
32 Correct 29 ms 4360 KB Output is correct
33 Correct 394 ms 38128 KB Output is correct
34 Correct 341 ms 38092 KB Output is correct
35 Correct 357 ms 38088 KB Output is correct
36 Correct 446 ms 39968 KB Output is correct
37 Correct 321 ms 39880 KB Output is correct
38 Correct 269 ms 38104 KB Output is correct
39 Correct 1 ms 212 KB Output is correct
40 Correct 3 ms 596 KB Output is correct
41 Correct 43 ms 4268 KB Output is correct
42 Correct 460 ms 35820 KB Output is correct
43 Correct 456 ms 36284 KB Output is correct
44 Correct 492 ms 36820 KB Output is correct
45 Correct 396 ms 37360 KB Output is correct
46 Correct 422 ms 37696 KB Output is correct
47 Correct 376 ms 37424 KB Output is correct
48 Correct 407 ms 37908 KB Output is correct
49 Correct 377 ms 38344 KB Output is correct
50 Correct 338 ms 38792 KB Output is correct
51 Correct 356 ms 39236 KB Output is correct
52 Correct 593 ms 33980 KB Output is correct
53 Correct 623 ms 33976 KB Output is correct
54 Correct 590 ms 33976 KB Output is correct
55 Correct 333 ms 37272 KB Output is correct
56 Correct 333 ms 37728 KB Output is correct
57 Correct 356 ms 37640 KB Output is correct