Submission #950438

#	Time	Username	Problem	Language	Result	Execution time	Memory
950438		Unforgettablepl	Fireworks (APIO16_fireworks)	C++17	19 / 100	14 ms	1188 KiB

fireworks

#include <bits/stdc++.h>
using namespace std;

#define int long long

int DP[301][301];
vector<pair<int,int>> adj[301];
int n,m;

void dfs(int x,int p){
    if(x>n){
        iota(DP[x],DP[x]+301,0);
        return;
    }
    for(auto&i:adj[x])if(i.first!=p) {
        dfs(i.first, x);
        for(int j=0;j<=300;j++){
            int best = INT64_MAX;
            for(int y=0;y<=j;y++)best=min(best,DP[i.first][y]+abs(i.second+y-j));
            DP[x][j]+=best;
        }
    }
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m;
    for(int i=2;i<=n+m;i++){
        int a,b;cin>>a>>b;
        adj[a].emplace_back(i,b);
        adj[i].emplace_back(a,b);
    }
    dfs(1,0);
    cout << *min_element(DP[1],DP[1]+301) << '\n';
}

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