Submission #1024459

#	Time	Username	Problem	Language	Result	Execution time	Memory
1024459		thinknoexit	City Mapping (NOI18_citymapping)	C++17	57 / 100	93 ms	18276 KiB

citymapping

#include "citymapping.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1010;
int n;
ll dis[N][N];
int p[N];
int fr(int i) {
	return p[i] == i ? i : p[i] = fr(p[i]);
}
ll d(int i, int j) {
	if (i == j) return 0;
	if (!dis[i][j]) return dis[i][j] = dis[j][i] = get_distance(i, j);
	return dis[i][j];
}
void find_roads(int NN, int Q, int A[], int B[], int W[]) {
	n = NN;
	if (Q == 12000) {
		ll mx = 0;
		int idx = 0;
		for (int i = 2;i <= n;i++) {
			if (d(1, i) > mx) {
				mx = d(1, i);
				idx = i;
			}
		}
		vector<pair<ll, int>> v;
		for (int i = 1;i <= n;i++) {
			v.push_back({ d(idx, i), i });
		}
		sort(v.begin(), v.end());
		for (int i = 1;i < n;i++) {
			A[i - 1] = v[i - 1].second;
			B[i - 1] = v[i].second;
			W[i - 1] = v[i].first - v[i - 1].first;
		}
		return;
	}
	vector<pair<ll, pair<int, int>>> v;
	for (int i = 1;i <= n;i++) {
		p[i] = i;
		for (int j = i + 1;j <= n;j++) {
			v.push_back({ d(i, j), {i, j} });
		}
	}
	int idx = 0;
	sort(v.begin(), v.end());
	for (auto& x : v) {
		int u = x.second.first, v = x.second.second;
		if (fr(u) == fr(v)) continue;
		p[fr(u)] = fr(v);
		A[idx] = u, B[idx] = v, W[idx] = x.first;
		idx++;
	}
	return;
}

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 0 / 43