제출 #356420

#제출 시각아이디문제언어결과실행 시간메모리
356420blueTriangles (CEOI18_tri)C++17
35 / 100
13 ms512 KiB
#include "trilib.h" #include <iostream> using namespace std; /* A convex hull is a set of points p[1], p[2], .... p[k] such that for every point for every i, and for every point q not equal to p[i] or p[i+1], p[i], p[i+1] and q are in clockwise order */ int main() { int n = get_n(); bool flag; int res = 0; for(int i = 1; i <= n; i++) { for(int j = 1; j <= n; j++) { if(i == j) continue; flag = 1; for(int k = 1; k <= n; k++) { if(k == i || k == j) continue; flag &= is_clockwise(i, j, k); if(!flag) break; } if(flag) { res++; break; } } } give_answer(res); }
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