Submission #385774

#	Time	Username	Problem	Language	Result	Execution time	Memory
385774		mohamedsobhi777	Triangles (CEOI18_tri)	C++14	35 / 100	124 ms	512 KiB

tri

#include <bits/stdc++.h>
#include "trilib.h"
using namespace std;

#define vi vector<int>
#define vll vector<ll>
#define vii vector<pair<int, int>>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define loop(_) for (int __ = 0; __ < (_); ++__)
#define pb push_back
#define f first
#define s second
#define sz(_) ((int)_.size())
#define all(_) _.begin(), _.end()
#define lb lower_bound
#define ub upper_bound

using ll = long long;
using ld = long double;

const int N = 1e5 + 7;
const ll mod = 1e9 + 7;

int gn;

bool ok(int x, int y)
{
       int mask = 0;
       for (int i = 1; i <= gn; ++i)
       {
              if (x == i || y == i || mask == 3)
                     continue;
              mask |= 1 << is_clockwise(x, y, i);
       }
       return mask != 3;
}

int main()
{
       ios_base::sync_with_stdio(0);
       cin.tie(0);
#ifndef ONLINE_JUDGE
#endif
       gn = get_n();

       int ans = 0;
       for (int i = 1; i <= gn; ++i)
       {
              for (int j = 1; j < i; ++j)
              {
                     ans += ok(i, j);
              }
       }
       cout << ans;
       return 0;
}

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