Submission #109406

#	Time	Username	Problem	Language	Result	Execution time	Memory
109406		futurer	Synchronization (JOI13_synchronization)	C++14	30 / 100	2478 ms	79360 KiB

synchronization

// in the name of ALLAH
#include<bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define F first
#define S second
#define lb(x) (x&(-x))
#define L(x) (x<<1)
#define R(x) (x<<1|1)
#define MID(l, r) ((l+r)>>1)
const int N = 2e5+9;
int RT[N], LST[N], FRST[N], AH[N], SZ[N], D[N], DS[N], DSD[N], n, m, q, stk;
vector<pii> adj[N], Yals[N];
vector<int> verts;
bitset<N> B;
set<pii> ST[N];
struct node { int mn, mx, lz; } DSG[N<<3];
struct undo { int id; node nd; } STK[N<<6];
void build(int id = 1, int l = 0, int r = m+3){
    if(r-l<2) { DSG[id]={l, l, -1}; return; }
    int mid = MID(l, r);
    build(L(id), l, mid);
    build(R(id), mid, r);
    DSG[id].mx = max(DSG[L(id)].mx, DSG[R(id)].mx);
    DSG[id].mn = min(DSG[L(id)].mn, DSG[R(id)].mn);
    DSG[id].lz=-1;
}
void shift(int id){
    int d = DSG[id].lz;
    if(!(~d)) return;
    STK[stk++]={L(id), DSG[L(id)]};
    STK[stk++]={R(id), DSG[R(id)]};
    STK[stk++]={id, DSG[id]};
    DSG[L(id)] = DSG[R(id)] = {d, d, d};
    DSG[id].lz=-1;
}
void addsg(int ll, int rr, int id = 1, int l = 0, int r = m+3){
    if(DSG[id].mn>rr) return;
    if(DSG[id].mx<ll) return;
    if(DSG[id].mn>=ll&&DSG[id].mx<=rr){ STK[stk++]={id, DSG[id]}; DSG[id] = {rr, rr, rr}; return; }
    int mid = MID(l, r);
    if(r-l<2) return;
    shift(id);
    addsg(ll, rr, L(id), l, mid);
    addsg(ll, rr, R(id), mid, r);
    STK[stk++]={id, DSG[id]};
    DSG[id].mx = max(DSG[L(id)].mx, DSG[R(id)].mx);
    DSG[id].mn = min(DSG[L(id)].mn, DSG[R(id)].mn);
}
int getind(int id = 1, int l = 0, int r = m+3){
    if(r-l<2) { if(DSG[id].mn>=m+2) return(-1); return(l); }
    int mid = MID(l, r);
    shift(id);
    if(DSG[R(id)].mn<=m+1) return(getind(R(id), mid, r));
    return(getind(L(id), l, mid));
}
void add(int ind, int d) { for(ind++;ind<N;ind+=lb(ind)) D[ind]+=d; }
int  get(int ind){
    int sm=0; for(ind++;ind;ind-=lb(ind)) sm+=D[ind];
    return(sm);
}
int getds(int a) { return(!DS[a]?a:DS[a]=getds(DS[a])); }
void merg(int a, int b, int d){
    a=getds(a); b=getds(b);
    DSD[a]=d;
    if(a^b) DS[b]=a;
}
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, int sz) { for(pii&x:adj[u]) if(x.F^p&&!B[x.F]&&SZ[x.F]>(sz>>1)) return(getrt(x.F, u, sz)); 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 vld(set<pii>&st, int l, int r){
    int frst=-1;
    while(1){
        auto it = st.lower_bound({l, -1});
        if(it==st.end()) break;
        pii x = *it; if(x.F>r) break;
        if(~frst) merg(frst, x.S, r);
        else frst=x.S;
        st.erase(it);
    }
    if(!(~frst)) return;
    merg(frst, frst, r);
    st.insert({r, frst});
}
void DFSg(int u, int p){
    for(pii&x:adj[u]) if(x.F^p&&!B[x.F]){
        DFSg(x.F, u);
        if(Yals[x.S].empty()) { vld(ST[x.F], 0, m+2); continue; }
        vld(ST[x.F], 0, Yals[x.S][0].F);
        for(int i=0;i<(int)Yals[x.S].size()-1;i++) vld(ST[x.F], Yals[x.S][i].S+1, Yals[x.S][i+1].F);
        vld(ST[x.F], Yals[x.S].back().S+1, m+2);
    }
    int arshad=0; for(pii&x:adj[u]) if(x.F^p&&!B[x.F]&&SZ[x.F]>=SZ[arshad]) arshad=x.F;
    if(!arshad){
        ST[u].insert({1, u});
        return;
    }
    ST[u].swap(ST[arshad]);
    ST[u].insert({1, u});
    for(pii&x:adj[u]) if(x.F^p&&x.F^arshad&&!B[x.F]) for(pii y:ST[x.F]) ST[u].insert(y);
}
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);
    }
}
void redo(int x) { while(stk>x) { stk--; DSG[STK[stk].id]=STK[stk].nd; } }
void DFS(int u, int p){
    int ind=stk;
    LST[u]=getind();
    redo(ind);
    for(pii&x:adj[u]) if(x.F^p&&!B[x.F]){
        if(Yals[x.S].empty()){
            int ah=stk;
            addsg(0, m+2);
            DFS(x.F, u);
            redo(ah); continue;
        }
        int ah=stk;
        addsg(0, Yals[x.S][0].F);
        for(int i=0;i<(int)Yals[x.S].size()-1;i++) addsg(Yals[x.S][i].F+1, Yals[x.S][i+1].F);
        addsg(Yals[x.S].back().S+1, m+2);
        DFS(x.F, u);
        redo(ah);
    }
}
void darkol(int u){
    setsz(u, 0);
    u=getrt(u, 0, SZ[u]);
    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) { DS[x]=0; DSD[x]=0; while(ST[x].size()) ST[x].erase(ST[x].begin()); }
    DFSg(u, 0);
    for(int&x:verts) FRST[x]=DSD[getds(x)];
    DFS(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+1) RT[u]++;
        if(~LST[x]) RT[x]++;
    }
}
int main(){
    scanf("%d %d %d", &n, &m, &q);
    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;
    }
    LST[0]=0;
    for(int i=1;i<n;i++) if(~LST[i]) Yals[i].push_back({LST[i], m+1});
    build();
    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:159:10: 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:161:24: 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:166:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a; scanf("%d", &a);
                ~~~~~^~~~~~~~~~
synchronization.cpp:175:21: 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: 0 / 10
• Subtask 4: 0 / 20
• Subtask 5: 0 / 40