Submission #887656

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
887656	2023-12-15 00:37:04	ad_red	Tri (CEOI09_tri)	C++17	0 / 100	33 ms	11220 KiB

tri

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#include <bits/stdc++.h>
#define endl "\n"
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using ll = long long;
using ld = long double;
ll inf = 1e9;
struct Point{
  ll x, y;
};
ll vp(Point a, Point b) {
  return a.x * b.y - a.y * b.x;
}
ll sgn(Point a, Point b, Point c) {
  // -1 if the order is A-B-C from left to right if B is the bottom point
  // 1 or 0 otherwise
  ll q = vp(Point{a.x - b.x, a.y - b.y}, Point{c.x - b.x, c.y - b.y});
  return (q / abs(q));
}
bool operator<(Point a, Point b) {
  return sgn(a, Point{0LL, 0LL}, b) == -1;
 
 
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Compilation message (stderr)

tri.cpp: In function 'int main()':
tri.cpp:212:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  212 |         if (mid + 1 == hulls[i].size() || !in_triangle(a, Point{0, 0}, b, hulls[i][mid + 1]) && sgn(hulls[i][mid + 1], hulls[i][mid], a) == 1) {
      |             ~~~~~~~~^~~~~~~~~~~~~~~~~~
tri.cpp:212:94: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  212 |         if (mid + 1 == hulls[i].size() || !in_triangle(a, Point{0, 0}, b, hulls[i][mid + 1]) && sgn(hulls[i][mid + 1], hulls[i][mid], a) == 1) {
      |                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tri.cpp:219:67: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
  219 |       for (int j = (l - 3 + hulls[i].size()) % hulls[i].size(); j <= (r + 3 + hulls[i].size()) % hulls[i].size(); j++) {
      |                                                                 ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100