Submission #959397

#	Time	Username	Problem	Language	Result	Execution time	Memory
959397		josanneo22	Cyberland (APIO23_cyberland)	C++17	100 / 100	329 ms	123484 KiB

cyberland

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

struct dsu {
	vector<int> par, sz;
	int total_groups;
	void init(int n) {
		par.resize(n); sz.resize(n);
		for (int i = 0; i < n; i++) {
			par[i] = i;
			sz[i] = 1;
		}
	}
	int find(int x) {
		if (par[x] == x) return x;
		else return par[x] = find(par[x]);
	}
	void unite(int x, int y) {
		x = find(x);
		y = find(y);
		if (x == y) return;
		if (sz[x] < sz[y]) swap(x, y);
		par[y] = x;
		sz[x] += sz[y];
		total_groups--;
	}
	bool same(int x, int y) {
		x = find(x);
		y = find(y);
		if (x == y) return true;
		else return false;
	}
};
#define ld long double
double solve(int N, int M, int K, int H, vector<int> fir, vector<int> sec, vector<int> co, vector<int> arr) {
	K = min(K, 69);
	vector<vector<pair<int,int>>> g(N);
	dsu ds; ds.init(N);
	for (int i = 0; i < M; i++) {
		if (fir[i] != H && sec[i] != H) ds.unite(fir[i], sec[i]);
		g[fir[i]].push_back(make_pair(co[i], sec[i]));
		g[sec[i]].push_back(make_pair(co[i], fir[i]));
	}
	vector<ld> pwr(K + 1, 1);
	for (int i = 1; i <= K; i++) {
		pwr[i] = pwr[i - 1] / 2;
	}
	arr[0] = 0;
	vector<vector<ld>> dist(K + 1, vector<ld>(N, 1e18));
	using node = tuple<ld, int, int>;
	priority_queue<node, vector<node>, greater<node>> pq;
	auto enq = [&](int k, int x, ld d) {
		if (dist[k][x] > d) {
			dist[k][x] = d;
			pq.push({ d,k,x });
		}
	};
	enq(K, H, 0);
	while (pq.size()) {
		auto [d, k, x] = pq.top(); pq.pop();
		if (dist[k][x] < d) continue;
		if (arr[x] == 0) return (double)d;
		for (auto& [c, v] : g[x]) {
			if (ds.find(v) != ds.find(0)) continue;
			enq(k, v, d + c * pwr[K - k]);
			if (arr[x] == 2 && k > 0) enq(k - 1, v, d + c * pwr[K - k + 1]);
		}
	}
	return (double)-1;
}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 7 / 7
• Subtask 6: 16 / 16
• Subtask 7: 29 / 29
• Subtask 8: 3 / 3