Submission #1214765

#	Time	Username	Problem	Language	Result	Execution time	Memory
1214765		guagua0407	Worst Reporter 4 (JOI21_worst_reporter4)	C++20	100 / 100	301 ms	106092 KiB

worst_reporter2

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2e5+5;
vector<int> adj[mxn];
map<int,int> mp[mxn];
vector<int> h(mxn),c(mxn),p(mxn);
vector<bool> is_cycle(mxn);
vector<bool> vis(mxn);

void dfs(int v){
    for(auto u:adj[v]){
        if(is_cycle[u]) continue;
        dfs(u);
        if(mp[u].size()>mp[v].size()) swap(mp[v],mp[u]);
        for(auto x:mp[u]){
            mp[v][x.f]+=x.s;
        }
    }
    if(is_cycle[v]) return;
    ll sum=c[v];
    while(sum>0){
        auto it=mp[v].lower_bound(h[v]);
        if(mp[v].empty() or it==mp[v].begin()) break;
        it--;
        if(sum-(*it).s<0){
            mp[v][(*it).f]-=sum;
            break;
        }
        else{
            sum-=(*it).s;
            mp[v].erase(it);
        }
    }
    mp[v][h[v]]+=c[v];
}

signed main(){_
    int n;
    cin>>n;
    ll sum=0;
    for(int i=1;i<=n;i++){
        cin>>p[i];
        cin>>h[i]>>c[i];
        sum+=c[i];
        adj[p[i]].push_back(i);
    }
    vector<vector<int>> cycle;
    for(int i=1;i<=n;i++){
        if(vis[i]) continue;
        int x=i;
        vector<int> tmp;
        while(!vis[x]){
            vis[x]=true;
            tmp.push_back(x);
            x=p[x];
        }
        vector<int> cyc;
        bool ok=false;
        for(auto v:tmp){
            if(v==x) ok=true;
            if(ok){
                cyc.push_back(v);
            }
        }
        if(ok) cycle.push_back(cyc);
    }
    for(auto vec:cycle){
        for(auto v:vec){
            is_cycle[v]=true;
        }
        vector<pair<int,ll>> dif;
        for(auto v:vec){
            //cout<<v<<' ';
            dfs(v);
            for(auto x:mp[v]){
                dif.push_back(x);
            }
        }
        //out<<'\n';
        map<int,int> ord;
        for(auto v:vec){
            ord[h[v]]+=c[v];
        }
        sort(all(dif));
        ll cur=0;
        ll mx=0;
        while(!ord.empty()){
            int H=(*ord.rbegin()).f;
            ll val=(*ord.rbegin()).s;
            ord.erase(prev(ord.end()));
            while(!dif.empty() and dif.back().f>=H){
                cur+=dif.back().s;
                dif.pop_back();
            }
            mx=max(mx,cur+val);
        }
        while(!dif.empty()){
            cur+=dif.back().s;
            dif.pop_back();
        }
        mx=max(mx,cur);
        //cout<<mx<<'\n';
        sum-=mx;
    }
    cout<<sum<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz

Compilation message (stderr)

worst_reporter2.cpp: In function 'void setIO(std::string)':
worst_reporter2.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
worst_reporter2.cpp:17:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 65 / 65
• Subtask 3: 21 / 21