제출 #667319

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
667319		radal	Fireworks (APIO16_fireworks)	C++17	7 / 100	1 ms	980 KiB

fireworks

#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,avx2")
#pragma GCC optimize("unroll-loops,O2")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 5e3+15,mod = 1e9+7;
constexpr ll inf = 1e18+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
   // if (a+b < 0) return a+b+mod;
    return a+b;
}

inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k >>= 1;
    } 
    return z; 
}

vector<pll> adj[N];
vector<ll> ve[N];
ll h[N];
int n,m;
ll dp[N][N];

void pre(int v){
	if (v > n) ve[v].pb(h[v]);
	for (pll p : adj[v]){
		int u = p.X;
		h[u] = h[v]+p.Y;
		pre(u);
		for (ll x : ve[u]) ve[v].pb(x);
	}
	sort(all(ve[v]));
	ve[v].resize(unique(all(ve[v]))-ve[v].begin());
}

void dfs(int v){
	for (auto [u,w] : adj[v]) dfs(u);
	int sz = ve[v].size();
	rep(i,0,sz){
		ll x = ve[v][i]-h[v];
		if (v > n && x){
			dp[v][i] = inf;
			continue;
		}
		dp[v][i] = 0;
		for (auto [u,w] : adj[v]){
			ll mi = inf;
			int sz2 = ve[u].size();
            if (!sz2) mi = 0;
			rep(j,0,sz2){
				ll y = ve[u][j]-h[u];
				if (y > x) break;
				ll cost;
				if (y+w <= x) cost = x-y-w;
				else
				   	cost = y+w-x;
				mi = min(mi,dp[u][j]+cost);
			}
			dp[v][i] += mi;
		}
	}
}

int main(){
	ios :: sync_with_stdio(0); cin.tie(0);
	cin >> n >> m;
	rep(i,2,n+m+1){
		int p,w;
		cin >> p >> w;
		adj[p].pb({i,w});
	}
	pre(1);
	ll out = inf;
	dfs(1);
	int sz = ve[1].size();
	rep(i,0,sz) out = min(out,dp[1][i]);
	cout << out;
}

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