Submission #398142

#	Time	Username	Problem	Language	Result	Execution time	Memory
398142		bonopo	Factories (JOI14_factories)	C++14	100 / 100	5663 ms	231436 KiB

factories

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#define pb push_back
#define el "\n"
#define f first
#define s second

#pragma GCC optimize("O3")
#pragma GCC target("sse4")

typedef long long ll;
const ll MM=5e5+5, MOD=1e9+7, LOG=20, INF=1e18;
int dep[MM], sz[MM], nxt[MM], in[MM], ot[MM], head[2*MM], ct=1, chn; ll dst[MM], spc[MM];
pair<int,int> st[LOG][4*MM];
bool blk[MM];

struct E {int nxt; pair<int,int> v; } e[2*MM];
void add(int u, int v, int w){
    e[chn].v={v,w}; e[chn].nxt=head[u]; head[u]=chn++; }
int lg2(int x) {
    return 32-__builtin_clz(x)-1; }
void df1(int u, int pa) {
    dep[u]=dep[pa]+1; st[0][ct]={dep[u], u}; in[u]=ct++;
    for(int i=head[u]; i!=-1; i=e[i].nxt) {
        int v=e[i].v.f, w=e[i].v.s; if(v==pa) continue;
        dst[v]=dst[u]+w; df1(v, u); sz[u]+=sz[v];
        st[0][ct++]={dep[u], u}; }
    ot[u]=ct; }
inline int qry(int l, int r) {
    int lg=lg2(r-l+1);
    int x=min(st[lg][l], st[lg][r-(1<<lg)+1]).s; return x; }
inline int lca(int u, int v) {
    if(in[u]>in[v]) swap(u, v);
    return qry(in[u], in[v]); }
void gsz(int u, int pa) {
    sz[u]=1;
    for(int i=head[u]; i!=-1; i=e[i].nxt) {
        int v=e[i].v.f; if(blk[v]||v==pa) continue;
        gsz(v, u); sz[u]+=sz[v]; } }
int ctr(int u, int pa, int nd) {
    for(int i=head[u]; i!=-1; i=e[i].nxt) {
        int v=e[i].v.f; if(blk[v]||v==pa) continue;
        if(sz[v]*2>nd) return ctr(v, u, nd); }
    return u; }
inline ll dist(int u, int v) {
    return dst[u]+dst[v]-2LL*dst[lca(u, v)]; }
void slv(int u, int pa) {
    gsz(u, -1); u=ctr(u, -1, sz[u]); blk[u]=1; nxt[u]=pa;
    for(int i=head[u]; i!=-1; i=e[i].nxt) {
        int v=e[i].v.f; if(!blk[v]) slv(v, u); } }
void Init(int N, int A[], int B[], int D[]) {
    memset(head, -1, sizeof(head));
    for(int i=0; i<N; ++i) spc[i]=INF;
    for(int i=0; i<N-1; ++i) {
        add(A[i], B[i], D[i]); add(B[i], A[i], D[i]); }
    df1(0, 0); slv(0, -1);
    for(int i=1; i<LOG; ++i)
        for(int j=1; j+(1<<i)-1<=ct; ++j)
            st[i][j]=min(st[i-1][j], st[i-1][j+(1<<(i-1))]); }
long long Query(int S, int X[], int T, int Y[]) {
    vector<int> vs;
    for(int i=0, c; i<S; ++i) {
        c=X[i];
        while(c!=-1)
            spc[c]=min(spc[c], dist(X[i], c)), vs.pb(c), c=nxt[c]; }
    long long ans=INF;
    for(int i=0, c; i<T; ++i) {
        c=Y[i];
        while(c!=-1)
            ans=min(ans, dist(Y[i], c)+spc[c]), c=nxt[c]; }
    for(int &x:vs) assert(x!=-1), spc[x]=INF;
    return ans;
}

• Subtask 1: 15 / 15
• Subtask 2: 18 / 18
• Subtask 3: 67 / 67