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답안 #767769

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
767769 2023-06-27T07:18:15 Z Abrar_Al_Samit 공장들 (JOI14_factories) C++17
100 / 100
 7534 ms 224060 KB 
#include "factories.h"
#include <bits/stdc++.h>

using namespace std;

const int nax = 5e5 + 3;
const int lg = 20;

vector<pair<int, int>>g[nax];
int CT_par[nax];

int st[nax], en[nax], tt = 0;
int up[nax][lg];
long long d[nax];
int sub[nax];

void dfs(int v, int p) {
    st[v] = tt++;
    up[v][0] = p;

    for(int j=1; j<lg; ++j) {
        up[v][j] = up[up[v][j-1]][j-1];
    }

    for(auto [u, w] : g[v]) if(u!=p) {
        d[u] = d[v] + w;
        dfs(u, v);
    }
    en[v] = tt-1;
}

bool ban[nax];

int cdfs(int v, int p = -1) {
    sub[v] = 1;
    for(auto [u, w] : g[v]) if(u!=p && !ban[u]) {
        sub[v] += cdfs(u, v);
    }
    return sub[v];
}
int get_centroid(int v, int sz, int p = -1) {
    for(auto [u, w] : g[v]) if(sub[u]*2>sz && u!=p && !ban[u]) {
        return get_centroid(u, sz, v);
    }
    return v;
}
void centroid(int v, int prevCen = -1) {
    int C = get_centroid(v, cdfs(v));

    CT_par[C] = prevCen;

    ban[C] = 1;
    for(auto [u, w] : g[C]) if(!ban[u]) {
        centroid(u, C);
    }
}

bool is_anc(int u, int v) {
    return st[u]<=st[v] && en[u]>=en[v];
}
int getLCA(int u, int v) {
    for(int j=lg-1; j>=0; --j) if(!is_anc(up[u][j], v)) {
        u = up[u][j];
    }
    if(!is_anc(u, v)) u = up[u][0];
    return u;
}
long long get_dist(int u, int v) {
    int lca = getLCA(u, v);
    return d[u] + d[v] - 2 * d[lca];
}
long long ans[nax];
long long mem[nax][lg];
void Init(int N, int A[], int B[], int D[]) {
    for(int i=0; i<N; ++i) {
        g[A[i]].emplace_back(B[i], D[i]);
        g[B[i]].emplace_back(A[i], D[i]);
    }

    dfs(0, 0);
    centroid(0);

    for(int i=0; i<N; ++i) {
        ans[i] = 1e18;
    }
    memset(mem, -1, sizeof mem);
}

long long Query(int S, int X[], int T, int Y[]) {
    for(int i=0; i<S; ++i) {
        int v = X[i];

        int u = v;

        int no = 0;
        while(u!=-1) {

            long long dis;
            if(mem[v][no]!=-1) dis = mem[v][no];
            else dis = mem[v][no] = get_dist(u, v);

            ans[u] = min(ans[u], dis);
            u = CT_par[u];

            ++no;
        }
    }

    long long ret = 1e18;

    for(int i=0; i<T; ++i) {
        int v = Y[i];

        int u = v;
        int no = 0;
        while(u!=-1) {
            long long dis;
            if(mem[v][no]!=-1) dis = mem[v][no];
            else dis = mem[v][no] = get_dist(u, v);

            ret = min(ret, ans[u] + dis);
            u = CT_par[u];
            ++no;
        }
    }

    for(int i=0; i<S; ++i) {
        int v = X[i];

        int u = v;
        while(u!=-1) {
            ans[u] = 1e18;
            u = CT_par[u];
        }
    }
    return ret;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 46 ms 90876 KB Output is correct
2 Correct 255 ms 99736 KB Output is correct
3 Correct 263 ms 99460 KB Output is correct
4 Correct 261 ms 99524 KB Output is correct
5 Correct 276 ms 99820 KB Output is correct
6 Correct 183 ms 99548 KB Output is correct
7 Correct 260 ms 99568 KB Output is correct
8 Correct 271 ms 99628 KB Output is correct
9 Correct 267 ms 99752 KB Output is correct
10 Correct 184 ms 99584 KB Output is correct
11 Correct 263 ms 99504 KB Output is correct

Subtask #2
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 40 ms 90476 KB Output is correct
2 Correct 2346 ms 177084 KB Output is correct
3 Correct 5237 ms 178600 KB Output is correct
4 Correct 896 ms 177840 KB Output is correct
5 Correct 7404 ms 201180 KB Output is correct
6 Correct 5198 ms 198652 KB Output is correct
7 Correct 936 ms 130040 KB Output is correct
8 Correct 361 ms 130684 KB Output is correct
9 Correct 1191 ms 133588 KB Output is correct
10 Correct 950 ms 131324 KB Output is correct

Subtask #3
67.0 / 67.0

# 결과 실행 시간 메모리 Grader output
1 Correct 46 ms 90876 KB Output is correct
2 Correct 255 ms 99736 KB Output is correct
3 Correct 263 ms 99460 KB Output is correct
4 Correct 261 ms 99524 KB Output is correct
5 Correct 276 ms 99820 KB Output is correct
6 Correct 183 ms 99548 KB Output is correct
7 Correct 260 ms 99568 KB Output is correct
8 Correct 271 ms 99628 KB Output is correct
9 Correct 267 ms 99752 KB Output is correct
10 Correct 184 ms 99584 KB Output is correct
11 Correct 263 ms 99504 KB Output is correct
12 Correct 40 ms 90476 KB Output is correct
13 Correct 2346 ms 177084 KB Output is correct
14 Correct 5237 ms 178600 KB Output is correct
15 Correct 896 ms 177840 KB Output is correct
16 Correct 7404 ms 201180 KB Output is correct
17 Correct 5198 ms 198652 KB Output is correct
18 Correct 936 ms 130040 KB Output is correct
19 Correct 361 ms 130684 KB Output is correct
20 Correct 1191 ms 133588 KB Output is correct
21 Correct 950 ms 131324 KB Output is correct
22 Correct 2675 ms 202952 KB Output is correct
23 Correct 2807 ms 205560 KB Output is correct
24 Correct 5444 ms 204952 KB Output is correct
25 Correct 5572 ms 208620 KB Output is correct
26 Correct 5619 ms 204852 KB Output is correct
27 Correct 7534 ms 224060 KB Output is correct
28 Correct 1031 ms 206452 KB Output is correct
29 Correct 5801 ms 204684 KB Output is correct
30 Correct 6723 ms 204304 KB Output is correct
31 Correct 6026 ms 204884 KB Output is correct
32 Correct 1084 ms 134516 KB Output is correct
33 Correct 348 ms 131284 KB Output is correct
34 Correct 644 ms 127792 KB Output is correct
35 Correct 621 ms 127760 KB Output is correct
36 Correct 981 ms 128320 KB Output is correct
37 Correct 895 ms 128352 KB Output is correct