oj.uz

Submission #957743

# Submission time Handle Problem Language Result Execution time Memory
957743 2024-04-04T09:03:02 Z yeediot Synchronization (JOI13_synchronization) C++17
30 / 100
 255 ms 28256 KB 
#include<bits/stdc++.h>
using namespace std;
#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);
    }
};
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>m>>q;
    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;
    }
    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(int _=0;_<m;_++){
        int 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';
}
 /*
 input:
 
 */

Compilation message

synchronization.cpp: In function 'void setIO(std::string)':
synchronization.cpp:41:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12380 KB Output is correct
2 Correct 3 ms 12380 KB Output is correct
3 Correct 3 ms 12380 KB Output is correct
4 Correct 3 ms 12380 KB Output is correct
5 Correct 3 ms 12320 KB Output is correct
6 Correct 3 ms 12388 KB Output is correct
7 Correct 13 ms 13660 KB Output is correct
8 Correct 12 ms 13676 KB Output is correct
9 Correct 12 ms 13660 KB Output is correct
10 Correct 225 ms 23888 KB Output is correct
11 Correct 180 ms 24088 KB Output is correct
12 Correct 208 ms 26192 KB Output is correct
13 Correct 133 ms 24096 KB Output is correct
14 Correct 166 ms 23496 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 26320 KB Output is correct
2 Correct 86 ms 25180 KB Output is correct
3 Correct 89 ms 27148 KB Output is correct
4 Correct 72 ms 26516 KB Output is correct

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 12380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 255 ms 28256 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 40.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 12380 KB Output isn't correct
2 Halted 0 ms 0 KB -