Submission #1020674

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020674		pcc	Fireworks (APIO16_fireworks)	C++17	19 / 100	40 ms	1884 KiB

fireworks

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

#define pii pair<int,int>
#define fs first
#define sc second
#define ll long long
const ll inf = 1e9;
const int mxn = 330;
int N,M;
vector<pii> tree[mxn];
ll dp[mxn][mxn],dep[mxn];
pii par[mxn];
bitset<mxn> boom;

void dfs(int now){
	fill(dp[now],dp[now]+mxn,inf);
	if(boom[now])dp[now][dep[now]] = 0;
	else fill(dp[now],dp[now]+mxn,0);
	for(auto [nxt,w]:tree[now]){
		//cerr<<now<<":"<<nxt<<endl;
		dep[nxt] = dep[now]+w;
		dfs(nxt);
		for(int i = 0;i<mxn;i++){
			dp[now][i] += dp[nxt][i];
		}
	}
	ll tmp[mxn];
	fill(tmp,tmp+mxn,inf);
	for(int i = 0;i<mxn;i++){
		for(int j = 0;j<mxn;j++){
			if(i-j>=-par[now].sc)tmp[i] = min(tmp[i],dp[now][j]+abs(i-j));
		}
	}
	//cerr<<now<<' '<<par[now].sc<<":";for(int j = 0;j<=30;j++)cerr<<(tmp[j]>=inf?-1:tmp[j])<<' ';cerr<<endl;
	for(int i = 0;i<mxn;i++)dp[now][i] = tmp[i];
	return;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N>>M;
	for(int i = 2;i<=N+M;i++){
		int p,c;
		cin>>p>>c;
		par[i] = pii(p,c);
		tree[p].push_back(pii(i,c));
	}
	for(int i = N+1;i<=N+M;i++)boom[i] = true;
	dfs(1);
	cout<<*min_element(dp[1],dp[1]+mxn)<<'\n';
	return 0;
}

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