Submission #1113088

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113088		guagua0407	Fireworks (APIO16_fireworks)	C++17	100 / 100	203 ms	89824 KiB

fireworks

//#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=6e5+5;
vector<int> adj[mxn];
priority_queue<ll> pq[mxn];
ll c[mxn];
ll val[mxn];
int n,m;

void dfs(int v,int p=0){
    if(v>n){
        pq[v].push(c[v]);
        pq[v].push(c[v]);
        return;
    }
    ll sum=0;
    for(auto u:adj[v]){
        dfs(u,v);
        val[v]+=val[u];
        sum+=pq[u].top();
        if(pq[v].size()<pq[u].size()) swap(pq[v],pq[u]);
        while(!pq[u].empty()){
            pq[v].push(pq[u].top());
            pq[u].pop();
        }
    }
    int sz=(int)adj[v].size();
    ll mx=pq[v].top();
    val[v]+=mx*sz-sum;
    for(int i=sz-1;i>=1;i--){
        ll r=pq[v].top();
        pq[v].pop();
        val[v]-=1ll*(r-pq[v].top())*i;
    }
    ll a=pq[v].top();
    pq[v].pop();
    ll b=pq[v].top();
    pq[v].pop();
    pq[v].push(a+c[v]);
    pq[v].push(b+c[v]);
}

signed main() {_
    cin>>n>>m;
    for(int i=2;i<=n+m;i++){
        int p;
        cin>>p>>c[i];
        adj[p].push_back(i);
    }
    dfs(1);
    cout<<val[1]<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz

Compilation message (stderr)

fireworks.cpp: In function 'void setIO(std::string)':
fireworks.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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fireworks.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: 7 / 7
• Subtask 2: 19 / 19
• Subtask 3: 29 / 29
• Subtask 4: 45 / 45