Submission #940936

#	Time	Username	Problem	Language	Result	Execution time	Memory
940936		12345678	Fireworks (APIO16_fireworks)	C++17	19 / 100	15 ms	860 KiB

fireworks

#include <bits/stdc++.h>

using namespace std;

const int nx=305;

int n, m, p, c, dp[nx][nx], ans=INT_MAX;
vector<pair<int, int>> d[nx];

void dfs(int u)
{
    if (u>n) return dp[u][0]=0, void();
    for (auto [v, w]:d[u]) dfs(v);
    for (int i=0; i<nx; i++)
    {
        int sm=0;
        for (auto [v, w]:d[u])
        {
            int vl=1e9;
            for (int x=0; x<=i; x++) vl=min(vl, dp[v][i-x]+abs(w-x));
            sm=min(sm+vl, (int)1e9);
        }
        dp[u][i]=sm;
    }
    //for (int i=0; i<nx; i++) cout<<u<<' '<<i<<' '<<dp[u][i]<<'\n';
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n+m; i++) for (int j=0; j<nx; j++) dp[i][j]=1e9;
    for (int i=2; i<=n+m; i++) cin>>p>>c, d[p].push_back({i, c});
    dfs(1);
    for (int i=0; i<nx; i++) ans=min(ans, dp[1][i]);
    cout<<ans;
}

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