Submission #996777

#	Time	Username	Problem	Language	Result	Execution time	Memory
996777		boyliguanhan	Worst Reporter 4 (JOI21_worst_reporter4)	C++17	100 / 100	319 ms	71440 KiB

worst_reporter2

#include<bits/stdc++.h>
using namespace std;
#define N 200100
#define int long long
int gonext[N],h[N],c[N],vis[N],ans;
vector<int>adj[N];
map<int,int>mp[N];
void merge(int a,int b){
    if(mp[a].size()<mp[b].size())
        swap(mp[a],mp[b]);
    for(auto[i,j]:mp[b])
        mp[a][i]+=j;
    mp[b].clear();
}
void dfs(int n,int p,int q=1){
    vis[n]=1;
    for(auto i:adj[n])if(i-p)
        dfs(i,n),merge(n,i);
    mp[n][h[n]+1]+=c[n];
    mp[n][h[n]];
    mp[n][0]+=c[n];
    if(q){
        auto it=mp[n].lower_bound(h[n]);
        while(it->second<c[n]){
            prev(it)->second+=it->second;
            it=--mp[n].erase(it);
        }
        it->second-=c[n];
    } else mp[n][h[n]]-=c[n];
}
void docomp(int n){
    while(!vis[n])
        vis[n]=1,n=gonext[n];
    vector<int>cyc;
    int y=n;
    do {
        cyc.push_back(y);
        y=gonext[y];
    } while(y-n);
    cyc.push_back(y);
    for(int i=1;i<cyc.size();i++)
        dfs(cyc[i],cyc[i-1],0);
    for(int i=1;i+1<cyc.size();i++)
        merge(n,cyc[i]);
    int pref=0,cur=1e18;
    for(auto[i,j]:mp[n])
        cur=min(cur,pref+=j);
    ans+=cur;
}
signed main(){
    cin.tie(0)->sync_with_stdio(0);
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>gonext[i]>>h[i]>>c[i];
        adj[gonext[i]].push_back(i);
    }
    for(int i=1;i<=n;i++)
        if(!vis[i])
            docomp(i);
    cout<<ans<<'\n';
}

Compilation message (stderr)

worst_reporter2.cpp: In function 'void docomp(long long int)':
worst_reporter2.cpp:41:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(int i=1;i<cyc.size();i++)
      |                 ~^~~~~~~~~~~
worst_reporter2.cpp:43:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(int i=1;i+1<cyc.size();i++)
      |                 ~~~^~~~~~~~~~~

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