제출 #733943

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
733943		vjudge1	City Mapping (NOI18_citymapping)	C++17	57 / 100	11 ms	724 KiB

citymapping

#include "citymapping.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll inf = 1e15;
void find_roads(int N, int Q, int A[], int B[], int W[]) {
    int r = -1;
    ll mx = 0;
    for (int i = 1; i < N; i++) {
		assert(Q--);
		ll s = get_distance(1, i + 1);
		if (s > mx) {
			mx = s;
			r = i;
		}
	}
	vector<ll> dis(N);
	for (int i = 0; i < N; i++) {
		assert(Q--);
		dis[i] = i == r ? 0 : get_distance(r + 1, i + 1);
	}
	vector<int> p(N);
	iota(p.begin(), p.end(), 0);
	sort(p.begin(), p.end(), [&](int i, int j) {
		return dis[i] < dis[j];
	});
	vector<vector<int>> d(N);
	d[0].push_back(r);
	for (int i = 1; i < N; i++) {
		int v = p[i];
		vector<bool> f(N);
		int lo = 0, hi = N - 1;
		while (lo < hi) {
			int mi = (lo + hi + 1) / 2;
			bool ok = 0;
			for (int x : d[mi]) {
				assert(Q--);
				if (dis[v] - dis[x] == get_distance(x + 1, v + 1)) {
					f[x] = 1;
					ok = 1;
				}
			}
			if (ok) {
				lo = mi;
			} else {
				hi = mi - 1;
			}
		}
		int u = -1;
		for (int x : d[lo]) {
			if (f[x]) {
				u = x;
			}
		}
		if (u == -1) {
			for (int x : d[lo]) {
				assert(Q--);
				if (dis[v] - dis[x] == get_distance(x + 1, v + 1)) {
					u = x;
					break;
				}
			}
		}
		A[i - 1] = u + 1;
		B[i - 1] = v + 1;
		W[i - 1] = dis[v] - dis[u];
		d[lo + 1].push_back(v);
	}
}

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