Submission #1253393

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253393		Geforgs	Grapevine (NOI22_grapevine)	C++20	0 / 100	1860 ms	1114112 KiB

Main

#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <unordered_map>
#include <stack>
#include <bit>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
#define ll long long
#define ld long double
#define inf (ll)(2*1e18)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define pb push_back
#define endl "\n"
using namespace std;

struct Node{
    ll parent, level;
    vector<ll> tin;
    vector<ll> tout;
    vector<ll> a;
    vector<ll> b;
    vector<ll> push;
};

void DFS1(ll id, ll last, ll l, vector<ll>& level, vector<vector<ll>>& a, vector<ll>& sz){
    sz[id] = 1;
    for(auto el: a[id]){
        if(el == last or level[el] < l) continue;
        DFS1(el, id, l, level, a, sz);
        sz[id] += sz[el];
    }
}

ll getCentroid(ll id, ll last, ll cnt, ll l, vector<ll>& level, vector<vector<ll>>& a, vector<ll>& sz){
    for(auto el: a[id]){
        if(el == last or level[el] < l) continue;
        if(2*sz[el] >= cnt){
            return getCentroid(el, id, cnt, l, level, a, sz);
        }
    }
    return id;
}

void DFS2(ll id, ll last, ll l, ll& time, vector<ll>& level, vector<vector<ll>>& a, vector<Node>& c, vector<ll>& d){
    c[d[id]].tin.pb(++time);
    for(auto el: a[id]){
        if(el == last or level[el] < l) continue;
        DFS2(el, id, l, time, level, a, c, d);
    }
    c[d[id]].tout.pb(time);
}

void build(ll id, ll last, ll l, vector<ll>& level, vector<vector<ll>>& a, vector<Node>& c, vector<ll>& sz, vector<ll>& d){
    DFS1(id, id, l, level, a, sz);
    ll centroid = getCentroid(id, id, sz[id], l, level, a, sz), time=-1;
    c.pb(Node());
    d[centroid] = c.size()-1;
    c.back().parent = last;
    c.back().level = l;
    c.back().a.resize(4*sz[id]);
    c.back().b.resize(4*sz[id], inf);
    c.back().push.resize(4*sz[id]);
    for(auto el: a[centroid]){
        if(level[el] < l) continue;
        build(el, d[centroid], l+1, level, a, c, sz, d);
    }
    DFS2(centroid, centroid, l, time, level, a, c, d);
}

bool isAncestor(ll id, ll x, ll y, vector<Node>& c){
    ll l = c[id].level;
    return c[x].tin[l] <= c[y].tin[l] and c[y].tout[l] <= c[x].tout[l];
}

void push(ll id, vector<ll>& a, vector<ll>& b, vector<ll>& p){
    a[2*id] += p[id];
    p[2*id] += p[id];
    if(b[2*id] != inf) b[2*id] += p[id];
    a[2*id+1] += p[id];
    p[2*id+1] += p[id];
    if(b[2*id+1] != inf) b[2*id+1] += p[id];
    p[id] = 0;
}

void add(ll id, ll l, ll r, ll tl, ll tr, ll val, vector<ll>& a, vector<ll>& b, vector<ll>& p){
    if(r < tl or tr < l) return;
    if(tl <= l and r <= tr){
        a[id] += val;
        p[id] += val;
        if(b[id] != inf) b[id] += val;
        return;
    }
    push(id, a, b, p);
    ll m=(l+r)/2;
    add(2*id, l, m, tl, tr, val, a, b, p);
    add(2*id+1, m+1, r, tl, tr, val, a, b, p);
    b[id] = min(b[2*id], b[2*id+1]);
}

void add(ll id, ll x, ll y, ll w, vector<Node>& c){
    if(id == -1) return;
    if(isAncestor(id, y, x, c)){
        swap(x, y);
    }
    add(1, 0, c[id].tout[c[id].level], c[x].tin[c[id].level], c[x].tout[c[id].level], w, c[id].a, c[id].b, c[id].push);
    add(c[id].parent, x, y, w, c);
}

void rev(ll id, ll l, ll r, ll x, vector<ll>& a, vector<ll>& b, vector<ll>& p){
    if(l == r){
        if(b[id] == inf){
            b[id] = a[id];
        }else{
            b[id] = inf;
        }
        return;
    }
    push(id, a, b, p);
    ll m=(l+r)/2;
    if(x <= m) rev(2*id, l, m, x, a, b, p);
    else rev(2*id, m+1, r, x, a, b, p);
    b[id] = min(b[2*id], b[2*id+1]);
}

ll get(ll id, ll l, ll r, ll x, vector<ll>& a, vector<ll>& b, vector<ll>& p){
    if(l == r){
        return a[id];
    }
    push(id, a, b, p);
    ll m=(l+r)/2;
    if(x <= m) return get(2*id, l, m, x, a, b, p);
    return get(2*id + 1, m+1, r, x, a, b, p);
}

ll get(ll id, ll x, vector<Node>& c){
    if(id == -1) return inf;
    ll res = get(c[id].parent, x, c), level=c[id].level;
    res = min(res, c[id].b[1] = get(1, 0, c[id].tout[level], c[x].tin[level], c[id].a, c[id].b, c[id].push));
    return res;
}

void rev(ll id, ll x, vector<Node>& c){
    if(id == -1) return;
    ll level = c[id].level;
    rev(1, 0, c[id].tout[level], c[x].tin[level], c[id].a, c[id].b, c[id].push);
    rev(c[id].parent, x, c);
}

void solve(){
    ll n, q, i, x, y, w, type, res;
    cin>>n>>q;
    vector<vector<ll>> a(n);
    vector<pair<pair<ll, ll>, ll>> b(n-1);
    vector<ll> level(n, inf);
    vector<Node> c;
    vector<ll> sz(n);
    vector<ll> d(n);
    for(i=0;i<n-1;++i){
        cin>>x>>y>>w;
        --x;
        --y;
        a[x].pb(y);
        a[y].pb(x);
        b[i] = {{x, y}, w};
    }
    build(0, -1, 0, level, a, c, sz, d);
    for(i=0;i<n;++i){
        reverse(c[i].tin);
        reverse(c[i].tout);
    }
    for(i=0;i<n-1;++i){
        if(level[b[i].first.first] < level[b[i].first.second]){
            x = b[i].first.first;
            y = b[i].first.second;
        }else{
            y = b[i].first.first;
            x = b[i].first.second;
        }
        add(d[x], d[x], d[y], b[i].second, c);
    }
    for(i=0;i<q;++i){
        cin>>type;
        if(type == 1){
            cin>>x;
            x = d[x];
            res = get(x, x, c);
            if(res == inf){
                cout<<-1<<endl;
            }else{
                cout<<res<<endl;
            }
        }else if(type == 2){
            cin>>x;
            x = d[x];
            rev(x, x, c);
        }else{
            cin>>x>>y>>w;
            if(level[x] > level[y]){
                swap(x, y);
            }
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    srand(time(nullptr));
    ll t=1;
//    cin>>t;
    for(;t>0;--t){
        solve();
    }
    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 18
• Subtask 6: 0 / 32