Submission #109494

#	Time	Username	Problem	Language	Result	Execution time	Memory
109494		futurer	Synchronization (JOI13_synchronization)	C++14	100 / 100	3605 ms	127120 KiB

synchronization

// in the name of ALLAH
#include<bits/stdc++.h>
using namespace std;
#define L(x) (x<<1)
#define R(x) (x<<1|1)
#define MID(l, r) ((l+r)>>1)
#define lb(x) (x&(-x))
#define pii pair<int, int>
#define F first
#define S second
const int N = 1e5+5, M = 2e5+5;
int SZ[N], FRST[N], LST[N], RT[N], DF[M], n, m, q, sz;
vector<pii> adj[N], Yals[N];
vector<int> verts;
bitset<N> B;
struct DS{
    struct node { int mn, mx, lz; } D[M<<3];
    struct undo { int id; node nd; } STK[M*300];
    int stk=0;
    inline void ad(int id) { STK[stk++]={id, D[id]}; }
    inline void merg(int id) { D[id].mx=max(D[L(id)].mx, D[R(id)].mx); D[id].mn=min(D[L(id)].mn, D[R(id)].mn); }
    void build(int id = 1, int l = 0, int r = m+3){
        if(r-l<2) { D[id]={l, l, -1}; return; }
        int mid = MID(l, r);
        build(L(id), l, mid);
        build(R(id), mid, r);
        merg(id);
        D[id].lz=-1;
    }
    inline void shift(int id){
        int d=D[id].lz;
        if(!(~d)) return;
        ad(id); ad(L(id)); ad(R(id));
        D[L(id)] = D[R(id)] = {d, d, d}; D[id].lz=-1;
    }
    void addlst(int s, int e, int id = 1, int l = 0, int r = m+3){
        if(D[id].mn>e||D[id].mx<s) return;
        if(D[id].mn>=s&&D[id].mx<=e) { ad(id); D[id] = {e, e, e}; return; }
        int mid = MID(l, r);
        shift(id);
        addlst(s, e, L(id), l, mid);
        addlst(s, e, R(id), mid, r);
        ad(id); merg(id);
    }
    void addfrst(int s, int e, int d, int id = 1, int l = 0, int r = m+3){
        if(l>=e || r<=s) return;
        if(l>=s && r<=e) { ad(id); D[id]={d, d, d}; return; }
        if(r-l<2) return;
        int mid = MID(l, r);
        shift(id);
        addfrst(s, e, d, L(id), l, mid);
        addfrst(s, e, d, R(id), mid, r);
        ad(id); merg(id);
    }
    int getLST(int id = 1, int l = 0, int r = m+3){
        if(r-l<2) { if(D[id].mn>=m+2) return(-1); return(l); }
        int mid = MID(l, r);
        shift(id);
        if(D[R(id)].mn<m+2) return(getLST(R(id), mid, r));
        return(getLST(L(id), l, mid));
    }
    int getind(int ind, int id = 1, int l = 0, int r = m+3){
        if(r-l<2) return(D[id].mn);
        int mid = MID(l, r);
        shift(id);
        if(ind<mid) return(getind(ind, L(id), l, mid));
        return(getind(ind, R(id), mid, r));
    }
    inline void redo(int x) { while(stk>x) { stk--; D[STK[stk].id]=STK[stk].nd; } }
} frst, lst;
inline void add(int ind, int d) { for(ind++;ind<M;ind+=lb(ind)) DF[ind]+=d; }
inline int  get(int ind){
    int sm=0; for(ind++;ind;ind-=lb(ind)) sm+=DF[ind];
    return(sm);
}
void setsz(int u, int p) { SZ[u]=1; for(pii&x:adj[u]) if(x.F^p&&!B[x.F]) { setsz(x.F, u); SZ[u]+=SZ[x.F]; } }
int  getrt(int u, int p) { for(pii&x:adj[u]) if(x.F^p&&!B[x.F]&&SZ[x.F]>=(sz>>1)) return(getrt(x.F, u)); return(u); }
void ini(int u, int p) { verts.push_back(u); for(pii&x:adj[u]) if(x.F^p&&!B[x.F]) ini(x.F, u); }
void DFSlst(int u, int p){
    if(!(~LST[p])) return;
    int f1=lst.stk;
    LST[u]=lst.getLST();
    if(!(~LST[u])) { lst.redo(f1); return; }
    for(pii&x:adj[u]) if(x.F^p&&!B[x.F]){
        int f2=lst.stk;
        vector<pii>&v=Yals[x.S];
        if(v.empty()) { lst.addlst(0, m+2); DFSlst(x.F, u); lst.redo(f2); continue; }
        lst.addlst(0, v[0].F);
        for(int i=0;i<(int)v.size()-1;i++) lst.addlst(v[i].S+1, v[i+1].F);
        lst.addlst(v.back().S+1, m+2);
        DFSlst(x.F, u);
        lst.redo(f2);
    }
    lst.redo(f1);
}
void DFSfrst(int u, int p){
    if(FRST[p]>=m+2) return;
    int f1=frst.stk;
    FRST[u]=frst.getind(0);
    if(FRST[u]>=m+2) { frst.redo(f1); return; }
    for(pii&x:adj[u]) if(x.F^p&&!B[x.F]){
        int f2=frst.stk;
        vector<pii>&v=Yals[x.S];
        if(v.empty()) { frst.addfrst(0, m+3, m+2); DFSfrst(x.F, u); frst.redo(f2); continue; }
        frst.addfrst(v.back().S+1, m+3, m+2);
        for(int i=(int)v.size()-2;~i;i--){
            int gt=frst.getind(v[i+1].F);
            frst.addfrst(v[i].S+1, v[i+1].F, gt);
        }
        int gt=frst.getind(v[0].F);
        frst.addfrst(0, v[0].F, gt);
        DFSfrst(x.F, u);
        frst.redo(f2);
    }
    frst.redo(f1);
}
void emal(int u, int p, int d){
    if(FRST[u]<m+2){
        add(FRST[u], d);
        for(pii&x:adj[u]) if(x.F^p&&!B[x.F]) emal(x.F, u, d);
    }
}
void Do(int u, int p){
    if(~LST[u]){
        RT[u]+=get(LST[u]);
        for(pii&x:adj[u]) if(x.F^p&&!B[x.F]) Do(x.F, u);
    }
}
inline void darkol(int u){
    setsz(u, 0); sz=SZ[u]; u=getrt(u, 0);
    B[u]=1; for(pii&x:adj[u]) if(!B[x.F]) darkol(x.F); B[u]=0;
    while(verts.size()) verts.pop_back();
    ini(u, 0);
    for(int&x:verts) { FRST[x]=m+2; LST[x]=-1; }
    DFSlst(u, 0);
    DFSfrst(u, 0);
    for(int t=0;t<2;t++){
        for(pii&x:adj[u]) if(!B[x.F]){
            Do(x.F, u);
            emal(x.F, u, 1);
        }
        for(pii&x:adj[u]) if(!B[x.F]) emal(x.F, u, -1);
        reverse(adj[u].begin(), adj[u].end());
    }
    for(int&x:verts) if(x^u){
        if(FRST[x]<m+2) RT[u]++;
        if(~LST[x]) RT[x]++;
    }
}
int main(){
    scanf("%d %d %d", &n, &m, &q);
    frst.build(); lst.build();
    for(int i=1;i<n;i++){
        int a, b; scanf("%d %d", &a, &b);
        adj[a].push_back({b, i});
        adj[b].push_back({a, i});
    }
    memset(LST, -1, sizeof(LST));
    for(int i=1;i<=m;i++){
        int a; scanf("%d", &a);
        if(~LST[a]) { Yals[a].push_back({LST[a], i}); LST[a]=-1; }
        else LST[a]=i;
    }
    for(int i=1;i<n;i++) if(~LST[i]) Yals[i].push_back({LST[i], m+1});
    LST[0]=0;
    darkol(1);
    for(int Q=0;Q<q;Q++){
        int a; scanf("%d", &a);
        printf("%d\n", RT[a]+1);
    }
}

Compilation message (stderr)

synchronization.cpp: In function 'int main()':
synchronization.cpp:151:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &n, &m, &q);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
synchronization.cpp:154:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a, b; scanf("%d %d", &a, &b);
                   ~~~~~^~~~~~~~~~~~~~~~~
synchronization.cpp:160:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a; scanf("%d", &a);
                ~~~~~^~~~~~~~~~
synchronization.cpp:168:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a; scanf("%d", &a);
                ~~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 40 / 40