// Om Namah Shivaya
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl
#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)
template<typename T>
void amin(T &a, T b) {
a = min(a, b);
}
template<typename T>
void amax(T &a, T b) {
a = max(a, b);
}
#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif
/*
*/
const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
template<typename T>
struct fenwick {
int siz;
vector<T> tree;
fenwick(int n) {
siz = n;
tree = vector<T>(n + 1);
}
int lsb(int x) {
return x & -x;
}
void build(vector<T> &a, int n) {
for (int i = 1; i <= n; ++i) {
int par = i + lsb(i);
tree[i] += a[i];
if (par <= siz) {
tree[par] += tree[i];
}
}
}
void pupd(int i, T v) {
i++;
while (i <= siz) {
tree[i] += v;
i += lsb(i);
}
}
T sum(int i) {
i++;
T res = 0;
while (i) {
res += tree[i];
i -= lsb(i);
}
return res;
}
T query(int l, int r) {
if (l > r) return 0;
T res = sum(r) - sum(l - 1);
return res;
}
};
template<typename T>
struct segtree {
// https://codeforces.com/blog/entry/18051
/*=======================================================*/
struct data {
vector<pll> a;
};
data neutral = data();
data merge(data &left, data &right) {
data curr;
auto &v1 = left.a, &v2 = right.a, &v3 = curr.a;
ll n = sz(v1), m = sz(v2);
ll ptr1 = 0, ptr2 = 0;
while (ptr1 < n and ptr2 < m) {
if (v1[ptr1] <= v2[ptr2]) {
v3.pb(v1[ptr1++]);
}
else {
v3.pb(v2[ptr2++]);
}
}
for (; ptr1 < n; ++ptr1) {
v3.pb(v1[ptr1]);
}
for (; ptr2 < m; ++ptr2) {
v3.pb(v2[ptr2]);
}
return curr;
}
void create(int i, T v) {
tr[i].a = v;
}
void modify(int i, T v) {
}
/*=======================================================*/
int n;
vector<data> tr;
segtree() {
}
segtree(int siz) {
init(siz);
}
void init(int siz) {
n = siz;
tr.assign(2 * n, neutral);
}
void build(vector<T> &a, int siz) {
rep(i, siz) create(i + n, a[i]);
rev(i, n - 1, 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
}
void pupd(int i, T v) {
modify(i + n, v);
for (i = (i + n) >> 1; i; i >>= 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
}
vector<pll> query(int l, int r, ll mn, ll mx) {
pll px = {mn, -inf2};
vector<pll> res;
for (l += n, r += n; l <= r; l >>= 1, r >>= 1) {
if (l & 1) {
auto &v = tr[l++].a;
auto it = upper_bound(all(v), px);
for (; it != v.end() and it->first <= mx; ++it) {
res.pb(*it);
}
}
if (!(r & 1)) {
auto &v = tr[r--].a;
auto it = upper_bound(all(v), px);
for (; it != v.end() and it->first <= mx; ++it) {
res.pb(*it);
}
}
}
return res;
}
};
void solve(int test_case)
{
ll n, k; cin >> n >> k;
vector<pll> a(n);
rep(i, n) cin >> a[i].ff >> a[i].ss;
rep(i, n) {
auto [x, y] = a[i];
a[i] = {x + y, x - y};
}
vector<ll> b;
rep(i, n) b.pb(a[i].ss);
sort(all(b));
b.resize(unique(all(b)) - b.begin());
ll siz = sz(b);
vector<array<ll, 3>> inds(n);
auto get_cnt = [&](ll m) {
rep(i, n) {
auto [x, y] = a[i];
inds[i][0] = lower_bound(all(b), y - m) - b.begin();
inds[i][1] = lower_bound(all(b), y) - b.begin();
inds[i][2] = upper_bound(all(b), y + m) - b.begin() - 1;
}
vector<array<ll, 3>> events;
rep(i, n) {
auto [x, y] = a[i];
events.pb({x, 0, i});
}
rep(i, n) {
auto [x, y] = a[i];
events.pb({x - m - 1, 1, i});
events.pb({x + m, 2, i});
}
sort(all(events));
fenwick<ll> fenw(siz + 5);
ll res = 0;
for (auto [x, t, i] : events) {
if (t == 0) {
fenw.pupd(inds[i][1], 1);
}
else {
ll c = 1;
if (t == 1) c = -1;
ll lx = inds[i][0], rx = inds[i][2];
res += fenw.query(lx, rx) * c;
}
}
res -= n;
res /= 2;
return res;
};
ll l = 0, r = 5e9;
ll mx_cost = inf2;
while (l <= r) {
ll mid = (l + r) >> 1;
if (get_cnt(mid) <= k) {
mx_cost = mid;
l = mid + 1;
}
else {
r = mid - 1;
}
}
debug(mx_cost);
return;
// vector<ll> b;
// rep(i, n) {
// auto [x, y] = a[i];
// b.pb(x - mx_cost), b.pb(x), b.pb(x + mx_cost);
// }
// sort(all(b));
// b.resize(unique(all(b)) - b.begin());
// ll siz = sz(b);
// vector<vector<pll>> here(siz);
// rep(i, n) {
// auto [x, y] = a[i];
// ll ind = lower_bound(all(b), x) - b.begin();
// here[ind].pb({y, x});
// }
// rep(i, siz) sort(all(here[i]));
// segtree<vector<pll>> st(siz + 5);
// st.build(here, siz);
// vector<ll> ans;
// rep(i, n) {
// auto [x, y] = a[i];
// ll lx = lower_bound(all(b), x - mx_cost) - b.begin();
// ll rx = lower_bound(all(b), x + mx_cost) - b.begin();
// ll mny = y - mx_cost;
// ll mxy = y + mx_cost;
// auto v = st.query(lx, rx, mny, mxy);
// for (auto [y2, x2] : v) {
// if (x == x2 and y == y2) conts;
// ll cost = max(abs(x - x2), abs(y - y2));
// ans.pb(cost);
// }
// }
// sort(all(ans));
// vector<ll> ans2;
// for (int i = 0; i < sz(ans); i += 2) {
// assert(ans[i] == ans[i + 1]);
// ans2.pb(ans[i]);
// }
// ans = ans2;
// while (sz(ans) < k) ans.pb(mx_cost + 1);
// trav(x, ans) cout << x << endl;
}
int main()
{
fastio;
int t = 1;
// cin >> t;
rep1(i, t) {
solve(i);
}
return 0;
}
Compilation message
road_construction.cpp: In function 'void solve(int)':
road_construction.cpp:48:18: warning: statement has no effect [-Wunused-value]
48 | #define debug(x) 42
| ^~
road_construction.cpp:294:5: note: in expansion of macro 'debug'
294 | debug(mx_cost);
| ^~~~~
road_construction.cpp:281:8: warning: variable 'mx_cost' set but not used [-Wunused-but-set-variable]
281 | ll mx_cost = inf2;
| ^~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
16 ms |
556 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
7338 ms |
55108 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
7539 ms |
55184 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
7539 ms |
55184 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
16 ms |
556 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
16 ms |
556 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
