This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/* There's someone in my head but it's not me */
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
typedef long long int ll;
typedef pair<int, int> pii;
#define SZ(x) (int) x.size()
#define F first
#define S second
const int N = 3e5 + 10, MOD = 1e9 + 7;
int n, X[N], Y[N], R[N], ord[N], xord[N], pos[N], ret[N];
struct node : set<pii> {
node *lc, *rc;
node() : lc(nullptr), rc(nullptr) {}
void build(int l = 1, int r = n + 1) {
if (r - l < 2) return;
int md = (l + r) >> 1;
lc = new node(), rc = new node();
lc->build(l, md), rc->build(md, r);
}
void remove(int p, int id, int l = 1, int r = n + 1) {
this->erase({Y[id], id});
if (r - l < 2) return;
int md = (l + r) >> 1;
if (p < md) lc->remove(p, id, l, md);
else rc->remove(p, id, md, r);
}
int get(ll xl, ll xr, ll yl, ll yr, int l = 1, int r = n + 1) {
if (xr <= X[xord[l]] || X[xord[r - 1]] + 1 <= xl || this->empty()) return -1;
if (xl <= X[xord[l]] && X[xord[r - 1]] + 1 <= xr) {
auto lb = this->lower_bound({yl, -1e9});
if (lb != this->end() && lb->F <= yr) return lb->S;
else return -1;
}
int md = (l + r) >> 1, a;
a = lc->get(xl, xr, yl, yr, l, md);
if (~a) return a;
return rc->get(xl, xr, yl, yr, md, r);
}
void ins(int p, int y, int id, int l = 1, int r = n + 1) {
this->insert({y, id});
if (r - l < 2) return;
int md = (l + r) >> 1;
if (p < md) lc->ins(p, y, id, l, md);
else rc->ins(p, y, id, md, r);
}
};
node* seg;
int intersect(int i, int j) {
ll x1 = X[i], x2 = X[j], y1 = Y[i], y2 = Y[j], r1 = R[i], r2 = R[j];
return x1 * x1 + x2 * x2 + y1 * y1 + y2 * y2 - r1 * r1 - r2 * r2 <= 2 * (r1 * r2 + x1 * x2 + y1 * y2);
}
int main() {
scanf("%d", &n);
for (int i = 1; i <= n; i++)
scanf("%d%d%d", &X[i], &Y[i], &R[i]);
iota(ord + 1, ord + n + 1, 1);
iota(xord + 1, xord + n + 1, 1);
sort(ord + 1, ord + n + 1, [&] (int i, int j) { return R[i] == R[j] ? i < j : R[i] > R[j]; });
sort(xord + 1, xord + n + 1, [&] (int i, int j) { return X[i] < X[j]; });
seg = new node(); seg->build();
for (int i = 1; i <= n; i++) {
seg->ins(i, Y[xord[i]], xord[i]), pos[xord[i]] = i;
}
for (int _ = 1; _ <= n; _++) {
int i = ord[_]; vector<int> ids;
if (ret[i]) continue;
for (;;) {
int id = seg->get(X[i] - 2ll * R[i], X[i] + 2ll * R[i] + 1, Y[i] - 2ll * R[i], Y[i] + 2ll * R[i]);
if (~id) ids.push_back(id), seg->remove(pos[id], id);
else break;
}
for (int &id : ids) {
if (intersect(i, id)) ret[id] = i;
else seg->ins(pos[id], Y[id], id);
}
}
for (int i = 1; i <= n; i++) printf("%d ", ret[i]);
printf("\n");
return 0;
}
Compilation message (stderr)
circle_selection.cpp: In function 'int main()':
circle_selection.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
66 | scanf("%d", &n);
| ~~~~~^~~~~~~~~~
circle_selection.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
68 | scanf("%d%d%d", &X[i], &Y[i], &R[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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