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1604. [Usaco2008 Open]Cow Neighborhoods 奶牛的邻居

https://hydro.ac/d/bzoj/record/6322ef45bdf9bc31d160a341
This commit is contained in:
Baoshuo Ren 2022-09-15 17:24:35 +08:00
parent 1a5233b4cb
commit 0317384c93
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
31 changed files with 152 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <set>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e5 + 5;
int n, c, fa[N], cnt[N], ans, max;
std::pair<int, int> points[N];
std::set<std::pair<int, int>> set;
int find(int x) {
return fa[x] == x ? x : fa[x] = find(fa[x]);
}
inline void merge(int x, int y) {
fa[find(x)] = find(y);
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> c;
for (int i = 1, x, y; i <= n; i++) {
cin >> x >> y;
points[i] = std::make_pair(x + y, x - y);
fa[i] = i;
}
std::sort(points + 1, points + 1 + n);
set.insert(std::make_pair(points[1].second, 1));
for (int i = 2, l = 1; i <= n; i++) {
while (points[i].first - points[l].first > c) {
set.erase(std::make_pair(points[l].second, l));
l++;
}
auto it = set.lower_bound(std::make_pair(points[i].second, 0));
if (it != set.end() && it->first - points[i].second <= c) merge(i, it->second);
if (it != set.begin() && points[i].second - (--it)->first <= c) merge(i, it->second);
set.insert(std::make_pair(points[i].second, i));
}
for (int i = 1; i <= n; i++) {
if (find(i) == i) ans++;
max = std::max(max, ++cnt[find(i)]);
}
cout << ans << ' ' << max << endl;
return 0;
}

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