oj.uz

Submission #386347

# Submission time Handle Problem Language Result Execution time Memory
386347 2021-04-06T12:25:19 Z model_code Geometrija (COCI21_geometrija) C++17
50 / 110
 1000 ms 492 KB 
#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " = " << x << endl
#define _ << " _ " <<

#define fi first
#define se second

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef vector<int> vi;

int sign(ll x) {
    if (x > 0) return 1;
    if (x < 0) return -1;
    return 0;
}

int ccw(const pii& a, const pii& b, const pii& c) {
    return sign((ll)a.fi * (b.se - c.se) +
                (ll)b.fi * (c.se - a.se) +
                (ll)c.fi * (a.se - b.se));
}


bool intersect(const pii& a, const pii& b, const pii& c, const pii& d) {
    if (a == b || a == c || a == d || b == c || b == d || c == d) return false;
    return ccw(a, b, c) != ccw(a, b, d) && ccw(c, d, a) != ccw(c, d, b);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int n;
    cin >> n;
    vector<pii> pts(n);
    for (auto& it : pts) cin >> it.fi >> it.se;

    int sol = 0;
    vector<pair<pii, pii>> tr;
    for (auto& a : pts) for (auto& b : pts) {
        if (a == b) continue;

        bool ok = true;
        for (auto& it : tr)
            ok &= !intersect(a, b, it.fi, it.se) && (it != make_pair(b, a));

        if (!ok) continue;

        tr.push_back({a, b});

        for (auto& c : pts) for (auto& d : pts)
            ok &= !intersect(a, b, c, d);
        sol += ok;
    }

    cout << sol << '\n';

    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 364 KB Output is correct
2 Correct 4 ms 364 KB Output is correct
3 Correct 4 ms 364 KB Output is correct
4 Correct 4 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 4 ms 364 KB Output is correct
8 Correct 4 ms 364 KB Output is correct
9 Correct 4 ms 364 KB Output is correct
10 Correct 4 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 364 KB Output is correct
2 Correct 4 ms 364 KB Output is correct
3 Correct 4 ms 364 KB Output is correct
4 Correct 4 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 4 ms 364 KB Output is correct
8 Correct 4 ms 364 KB Output is correct
9 Correct 4 ms 364 KB Output is correct
10 Correct 4 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 436 ms 364 KB Output is correct
13 Correct 433 ms 492 KB Output is correct
14 Correct 326 ms 364 KB Output is correct
15 Correct 275 ms 364 KB Output is correct
16 Correct 297 ms 408 KB Output is correct
17 Correct 369 ms 364 KB Output is correct
18 Correct 461 ms 364 KB Output is correct
19 Correct 459 ms 400 KB Output is correct
20 Correct 441 ms 388 KB Output is correct
21 Correct 423 ms 364 KB Output is correct
22 Correct 431 ms 492 KB Output is correct
23 Correct 418 ms 492 KB Output is correct

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 364 KB Output is correct
2 Correct 4 ms 364 KB Output is correct
3 Correct 4 ms 364 KB Output is correct
4 Correct 4 ms 364 KB Output is correct
5 Correct 3 ms 364 KB Output is correct
6 Correct 3 ms 364 KB Output is correct
7 Correct 4 ms 364 KB Output is correct
8 Correct 4 ms 364 KB Output is correct
9 Correct 4 ms 364 KB Output is correct
10 Correct 4 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 436 ms 364 KB Output is correct
13 Correct 433 ms 492 KB Output is correct
14 Correct 326 ms 364 KB Output is correct
15 Correct 275 ms 364 KB Output is correct
16 Correct 297 ms 408 KB Output is correct
17 Correct 369 ms 364 KB Output is correct
18 Correct 461 ms 364 KB Output is correct
19 Correct 459 ms 400 KB Output is correct
20 Correct 441 ms 388 KB Output is correct
21 Correct 423 ms 364 KB Output is correct
22 Correct 431 ms 492 KB Output is correct
23 Correct 418 ms 492 KB Output is correct
24 Execution timed out 1092 ms 364 KB Time limit exceeded
25 Halted 0 ms 0 KB -