Submission #410492

#	Time	Username	Problem	Language	Result	Execution time	Memory
410492		abdzag	Triangles (CEOI18_tri)	C++17	35 / 100	1681 ms	312 KiB

tri

#include<bits/stdc++.h>
#include<unordered_map>
#include "trilib.h"
#define rep(i,a,b) for(int i=int(a);i<int(b);i++)
#define rrep(i,a,b) for(int i=int(a);i>int(b);i--)
#define all(v) v.begin(),v.end()
#define trav(a,v) for(auto&a:v)
#define  sz(a) a.size()
typedef long double ld;
using namespace std;
const long long inf = 1e15;
typedef long long ll;
typedef unsigned long long ull;
 
int n = get_n();
 
int main() {
	vector<ll> res(n + 1, -1);
	rep(i, 1, n + 1) {
		if (res[i] != -1) {
			continue;
		}
		rep(j, 1, n + 1) {
			if (i == j)continue;
			if (j == 0)continue;
			ll cur = 0;
			bool done = true;
			rep(z, 1, n + 1) {
				if (z == i || z == j)continue;
				if (is_clockwise(i, j, z)) {
					done = false;
					if (cur == -1)break;
					cur = 1;
				}
				else if (is_clockwise(i, j, z)) {
					done = false;
					if (cur == 1)break;
					cur = -1;
				}
			}
			if (done) {
				res[i] = 1;
				res[j] = 1;
				break;
			}
		}
		if (res[i] == -1)res[i] = 0;
	}
	ll ans = 0;
	rep(i, 1, n + 1)ans += res[i];
	give_answer(ans);
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 25