#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll Bx, By;
struct Point {
ll x, y;
int idx;
Point operator-(const Point p) const { return {x - p.x, y - p.y, idx}; }
Point operator+(const Point p) const { return {x + p.x, y + p.y, idx}; }
ll cross(const Point p) const { return x * p.y - y * p.x; }
bool operator<(const Point p) const { return to_upper().cross(p.to_upper()) > 0; }
Point to_upper() const { return above() ? *this : negate(); }
bool above() const {
// TODO: Improve this
const Point B{Bx, By, -1};
return B.cross(*this) > 0;
}
ll operator*(const Point p) const { return x * p.x + y * p.y; }
bool deg0(const Point p) const { return cross(p) == 0 && *this * p >= 0; }
bool deg180(const Point p) const { return cross(p) == 0 && *this * p < 0; }
Point negate() const { return {-x, -y, idx}; }
};
template <class T>
struct BIT {
BIT(const int n) : n(n) { bit.assign(n, 0); }
// void clear(const int n) { memset(bit, 0, n * sizeof(T)); }
T sum(int l, int r) { return sum(r) - sum(l - 1); }
void add(int idx, const T delta) {
for (; idx < n; idx = idx | (idx + 1)) bit[idx] += delta;
}
private:
int n;
vector<T> bit;
T sum(int r) {
T ret = 0;
for (; r >= 0; r = (r & (r + 1)) - 1) ret += bit[r];
return ret;
}
};
unordered_map<int, vector<Point>> order_by_b;
bool cmp_by_b(Point p, Point q) {
p.x -= Bx;
q.x -= Bx;
p.y -= By;
q.y -= By;
const bool a1 = p.above();
const bool a2 = q.above();
if (a1 != a2) return a1;
return p.cross(q) > 0;
}
int handle_query(const vector<Point>& points1, const vector<Point>& points2,
const vector<Point>& ord_b, const Point B) {
if (points1.empty() || points2.empty()) return 0;
BIT<char> active(points2.size());
for (const auto q : points2) {
if (!q.above()) {
active.add(q.idx, 1);
}
}
int total = 0;
int j = 0;
for (const Point p : points1) {
while (j < (int)points2.size()) {
const Point q = points2[j];
if (q.to_upper().cross(p.to_upper()) < 0) break;
if (q.above()) {
active.add(q.idx, 1);
} else {
active.add(q.idx, -1);
}
j++;
}
Point from_point = p;
Point to_point = B + (p - B).negate();
if (!p.above()) swap(from_point, to_point);
const auto it1 = lower_bound(ord_b.begin(), ord_b.end(), from_point, cmp_by_b);
const auto it2 = lower_bound(ord_b.begin(), ord_b.end(), to_point, cmp_by_b);
const int from = it1 - ord_b.begin();
const int to = it2 - ord_b.begin();
total += active.sum(from, to - 1);
}
return total;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int N, M, Q;
while (cin >> N >> M) {
vector<Point> points;
unordered_map<int, vector<Point>> tribe_points;
for (int i = 0; i < N; i++) {
Point p;
int tribe;
cin >> p.x >> p.y >> tribe;
tribe_points[tribe].push_back(p);
}
Point A;
cin >> A.x >> A.y;
cin >> Bx >> By;
cin >> Q;
Bx -= A.x;
By -= A.y;
for (auto& [_, points] : tribe_points) {
for (auto& p : points) p = p - A;
}
for (auto& [tribe_idx, points] : tribe_points) {
sort(points.begin(), points.end(), cmp_by_b);
for (int i = 0; i < (int)points.size(); i++) points[i].idx = i;
order_by_b[tribe_idx] = points;
}
for (auto& [_, points] : tribe_points) {
sort(points.begin(), points.end());
}
const Point B{Bx, By, -1};
map<pair<int, int>, int> memo;
while (Q--) {
int i, j;
cin >> i >> j;
if (memo.count({i, j})) {
cout << memo.count({i, j}) << '\n';
continue;
}
const int ans = handle_query(tribe_points[i], tribe_points[j], order_by_b[j], B);
memo[{i, j}] = ans;
cout << ans << '\n';
}
}
}
Compilation message
dragon2.cpp: In function 'int main()':
dragon2.cpp:130:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
130 | for (auto& [_, points] : tribe_points) {
| ^
dragon2.cpp:134:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
134 | for (auto& [tribe_idx, points] : tribe_points) {
| ^
dragon2.cpp:140:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
140 | for (auto& [_, points] : tribe_points) {
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
600 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
18 ms |
1860 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
600 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
