Submission #958226

#	Time	Username	Problem	Language	Result	Execution time	Memory
958226		yeediot	Synchronization (JOI13_synchronization)	C++17	60 / 100	355 ms	42836 KiB

synchronization

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
 
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
struct line{
    int a,b;
    int operator()(const int x)const{
        return a*x+b;
    }
};
bool check(line l1,line l2,line l3){
    return (l3.b-l2.b)*(l1.a-l2.a)<=(l2.b-l1.b)*(l2.a-l3.a);
}
const int mxn=1e5+5;
vector<int>adj[mxn];
int dep[mxn];
int in[mxn],out[mxn],timer;
int jump[20][mxn];
vector<int>st[mxn];
bool ex[mxn];
void dfs(int v,int pa){
    dep[v]=dep[pa]+1;
    jump[0][v]=pa;
    st[v].pb(v);
    in[v]=++timer;
    for(auto u:adj[v]){
        if(u==pa)continue;
        dfs(u,v);
    }
    out[v]=timer;
}
int n,m,q;
void build(){
    for(int i=1;i<20;i++){
        for(int j=1;j<=n;j++){
            jump[i][j]=jump[i-1][jump[i-1][j]];
        }
    }
}
struct BIT{
    int bit[mxn];
    void init(){
        for(int i=0;i<=n;i++)bit[i]=0;
    }
    void modify(int p,int v){
        for(;p<=n;p+=p&-p){
            bit[p]+=v;
        }
    }
    void modify(int l,int r,int v){
        modify(l,v);
        modify(r+1,-v);
    }
    int query(int p){
        int res=0;
        for(;p;p-=p&-p){
            res+=bit[p];
        }
        return res;
    }
    int query(int l,int r){
        return query(r)-query(l);
    }
};
pair<int,int>edge[mxn];
bool used[mxn];
int tag[2][mxn*4];
int seg[2][mxn*4];
void build(int l,int r,int id){
    tag[1][id]=-1e18;
    tag[0][id]=1e18;
    if(l==r){
        seg[0][id]=seg[1][id]=l;
        return;
    }
    int mm=l+r>>1;
    build(l,mm,id*2);
    build(mm+1,r,id*2+1);
    seg[0][id]=min(seg[0][id*2],seg[0][id*2+1]);
    seg[1][id]=max(seg[1][id*2],seg[1][id*2+1]);
}
void push(bool f,int id){
    if(f){
        chmax(seg[f][id*2],tag[f][id]);
        chmax(seg[f][id*2+1],tag[f][id]);
        chmax(tag[f][id*2],tag[f][id]);
        chmax(tag[f][id*2+1],tag[f][id]);
    }
    else{
        chmin(seg[f][id*2],tag[f][id]);
        chmin(seg[f][id*2+1],tag[f][id]);
        chmin(tag[f][id*2],tag[f][id]);
        chmin(tag[f][id*2+1],tag[f][id]);
    }
}
void modify(int l,int r,int id,int ql,int qr,int v,bool f){
    if(qr<l or r<ql){
        return;
    }
    if(ql<=l and r<=qr){
        if(f){
            chmax(seg[f][id],v);
            chmax(tag[f][id],v);
        }
        else{
            chmin(seg[f][id],v);
            chmin(tag[f][id],v);
        }
        return;
    }
    int mm=l+r>>1;
    push(f,id);
    modify(l,mm,id*2,ql,qr,v,f);
    modify(mm+1,r,id*2+1,ql,qr,v,f);
    if(f==0){
        seg[f][id]=min(seg[f][id*2],seg[f][id*2+1]);
    }
    else{
        seg[f][id]=max(seg[f][id*2],seg[f][id*2+1]);
    }
}
void modify(int l,int r,int v,bool f){
    modify(1,n,1,l,r,v,f);
}
pii query(int l,int r,int id,int p){
    if(l==r){
        return make_pair(seg[0][id],seg[1][id]);
    }
    int mm=l+r>>1;
    push(0,id);
    push(1,id);
    if(p<=mm){
        return query(l,mm,id*2,p);
    }
    else{
        return query(mm+1,r,id*2+1,p);
    }
}
pii query(int p){
    return query(1,n,1,p);
}
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>m>>q;
    if(q==1){
        int l[m],r[m];
        for(int i=1;i<n;i++){
            int a,b;
            cin>>a>>b;
            adj[a].pb(b);
            adj[b].pb(a);
            l[i]=a;
            r[i]=b;
        }
        vector<int>op(m);
        for(int i=0;i<m;i++){
            cin>>op[i];
        }
        int root;
        cin>>root;
        dfs(root,0);
        build();
        BIT bt;
        bt.init();
        for(auto x:op){
            int v=l[x],u=r[x];
            if(dep[v]<dep[u]){
                swap(v,u);
            }
            if(ex[x]==1){
                bt.modify(in[v],out[v],-1);
                ex[x]=0;
            }
            else{
                bt.modify(in[v],out[v],1);
                ex[x]=1;
                int d=v;
                for(int i=19;i>=0;i--){
                    int D=jump[i][d];
                    if(bt.query(in[D],in[d])==(1<<i)){
                        d=D;
                    }
                }
                if(sz(st[v])>sz(st[d]))swap(st[v],st[d]);
                st[d].insert(st[d].end(),all(st[v]));
                st[v].clear();
            }
        }
        cout<<sz(st[root])<<'\n';
    }
    else{
        set<pii>st;
        for(int i=1;i<n;i++){
            st.insert({i,i});
            cin>>edge[i].F>>edge[i].S;
        }
        st.insert({n,n});
        build(1,n,1);
        for(int i=0;i<m;i++){
            int x;
            cin>>x;
            auto [l,r]=edge[x];
            if(used[x]){
                auto it=prev(st.lower_bound(make_pair(r+1,0)));
                auto [L,R]=*it;
                st.erase(it);
                st.insert({L,l});
                st.insert({r,R});
            }
            else{
                auto it2=st.lower_bound(make_pair(l+1,0));
                auto it=prev(it2);
                int v=query(it2->S).S;
                modify(it->F,it->S,v,1);
                v=query(it->F).F;
                modify(it2->F,it2->S,v,0);
                int L=it->F;
                int R=it2->S;
                st.erase(it);
                st.erase(it2);
                st.insert({L,R});
            }
            used[x]=!used[x];
            debug(l,r,st);
        }
        while(q--){
            int x;
            cin>>x;
            auto [l,r]=query(x);
            cout<<r-l+1<<'\n';
        }
    }
}
 /*
 input:
 
 */

Compilation message (stderr)

synchronization.cpp: In function 'void build(long long int, long long int, long long int)':
synchronization.cpp:116:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  116 |     int mm=l+r>>1;
      |            ~^~
synchronization.cpp: In function 'void modify(long long int, long long int, long long int, long long int, long long int, long long int, bool)':
synchronization.cpp:151:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  151 |     int mm=l+r>>1;
      |            ~^~
synchronization.cpp: In function 'std::pair<long long int, long long int> query(long long int, long long int, long long int, long long int)':
synchronization.cpp:169:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  169 |     int mm=l+r>>1;
      |            ~^~
synchronization.cpp: In function 'void setIO(std::string)':
synchronization.cpp:42:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
synchronization.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 0 / 40