Submission #943851

#	Time	Username	Problem	Language	Result	Execution time	Memory
943851		kim	Fireworks (APIO16_fireworks)	C++17	7 / 100	14 ms	32344 KiB

fireworks

#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
using ll=long long;

struct A{
    multiset<ll> L,R;
    ll mn;
    A():mn(0){}
    void insert(ll x1,ll x2,ll c){
        mn+=c;
        if(L.empty()) L.insert(x1), R.insert(x2);
        else if(x2<*L.rbegin()){
            mn+=*L.rbegin()-x2;
            L.emplace(x1), L.emplace(x2);
            R.emplace(*L.rbegin()), L.erase(prev(L.end()));
        }
        else if(x1>*R.begin()){
            mn+=x1-*R.begin();
            R.emplace(x1), R.emplace(x2);
            L.emplace(*R.begin()), R.erase(R.begin());
        }
        else L.emplace(x1), R.emplace(x2);
    }
}t[300005];

int p[300005];
ll c[300005];

int main(){
    ios::sync_with_stdio(false); cin.tie(0);

    int n,m; cin>>n>>m;
    for(int i=2;i<=n+m;++i) cin>>p[i]>>c[i];
    for(int i=n+m;i>n;--i) t[p[i]].insert(c[i],c[i],0);
    for(int i=n;i>1;--i){
        ll x1=*t[i].L.rbegin(),  x2=*t[i].R.begin();
        t[p[i]].insert(x1+c[i],x2+c[i],t[i].mn);
    }
    cout<<t[1].mn;

}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 19
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45