oj.uz

Submission #973852

# Submission time Handle Problem Language Result Execution time Memory
973852 2024-05-02T11:54:10 Z efedmrlr Triangles (CEOI18_tri) C++17
100 / 100
 20 ms 3028 KB 
#include <bits/stdc++.h>
#include "trilib.h"
#define lli long long int
#define ld long double
#define pb push_back
#define MP make_pair
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define REP(i, n) for(int i = 0; (i) < (n); (i)++)

using namespace std;

void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
}

int n;
void find_hull(vector<int> &p, vector<int> &hull) {
    if(p.size() < 3) return;
    int piv = p[0];
    p.erase(p.begin());
    auto comp = [&piv](int x, int y) {
        return is_clockwise(piv, x, y);
    };
    sort(all(p), comp);
    hull.clear();
    hull.pb(piv);
    hull.pb(p[0]);
    for(int i = 1; i < p.size(); i++) {
        while(hull.size() > 1 && !is_clockwise(hull[hull.size() - 2], hull.back(), p[i])) {
            hull.pop_back();
        } 
        hull.pb(p[i]);
    }

}

void solve() {
    n = get_n();
    vector<int> p;
    for(int i = 1; i <= n; i++) {
        p.pb(i);
    }
    vector<int> pl = {2, 1}, pr = {1, 2};
    for(int i = 3; i <= n; i++) {
        if(is_clockwise(1, 2, i)) {
            pl.pb(i);
        }
        else {
            pr.pb(i);
        }
    }
    vector<int> hull1, hull2;
    find_hull(pl, hull1);
    find_hull(pr, hull2);
    // hull1 starts with 2, hull2 starts with 1
    // cout << "hull1: ";
    // for(auto c : hull1) {
    // cout << c << " ";
    // }
    // cout << "\nhull2: ";
    // for(auto c : hull2) {
    //     cout << c << " ";
    // }
    // cout << "\n";
    if(hull1.empty()) {
        give_answer(hull2.size());
        return;
    }
    if(hull2.empty()) {
        give_answer(hull1.size());
        return;
    }
    hull1.pop_back(); hull2.pop_back();

    reverse(all(hull1));
    while(1) {
        if(hull1.size() > 1 && hull2.size() && !is_clockwise(hull2.back(), hull1.back(), hull1[hull1.size() - 2])) {
            hull1.pop_back();
            continue;
        } 
        if(hull2.size() > 1 && hull1.size() && !is_clockwise(hull2[hull2.size() - 2], hull2.back(), hull1.back())) {
            hull2.pop_back();
            continue;
        }
        break;
    }   
    reverse(all(hull1));
    reverse(all(hull2));
    while(1) {
        if(hull1.size() > 1 && hull2.size() && is_clockwise(hull2.back(), hull1.back(), hull1[hull1.size() - 2])) {
            hull1.pop_back();
            continue;
        } 
        if(hull2.size() > 1 && hull1.size() && is_clockwise(hull2[hull2.size() - 2], hull2.back(), hull1.back())) {
            hull2.pop_back();
            continue;
        }
        break;
    }   
    for(auto c : hull2) {
        hull1.pb(c);
    }
    sort(all(hull1));
    hull1.resize(unique(all(hull1)) - hull1.begin());
    give_answer(hull1.size());
}

signed main() {
    solve();
}

Compilation message

tri.cpp: In function 'void find_hull(std::vector<int>&, std::vector<int>&)':
tri.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for(int i = 1; i < p.size(); i++) {
      |                    ~~^~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 1 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 440 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 1 ms 452 KB Output is correct
43 Correct 1 ms 344 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 1 ms 344 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 1 ms 344 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 1 ms 348 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 1 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 440 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 1 ms 452 KB Output is correct
43 Correct 1 ms 344 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 1 ms 344 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 1 ms 344 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 1 ms 348 KB Output is correct
53 Correct 0 ms 344 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 1 ms 348 KB Output is correct
58 Correct 5 ms 1088 KB Output is correct
59 Correct 5 ms 1112 KB Output is correct
60 Correct 6 ms 1116 KB Output is correct
61 Correct 6 ms 964 KB Output is correct
62 Correct 6 ms 1116 KB Output is correct
63 Correct 6 ms 1184 KB Output is correct
64 Correct 6 ms 1116 KB Output is correct
65 Correct 6 ms 1216 KB Output is correct
66 Correct 5 ms 860 KB Output is correct
67 Correct 6 ms 1112 KB Output is correct
68 Correct 5 ms 956 KB Output is correct
69 Correct 5 ms 956 KB Output is correct
70 Correct 5 ms 1116 KB Output is correct
71 Correct 6 ms 1116 KB Output is correct
72 Correct 7 ms 1116 KB Output is correct
73 Correct 6 ms 860 KB Output is correct
74 Correct 6 ms 1112 KB Output is correct
75 Correct 5 ms 1116 KB Output is correct
76 Correct 5 ms 1116 KB Output is correct
77 Correct 4 ms 1116 KB Output is correct
78 Correct 4 ms 1072 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 432 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 344 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 1 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 440 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 1 ms 452 KB Output is correct
43 Correct 1 ms 344 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 1 ms 344 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 1 ms 344 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 1 ms 348 KB Output is correct
53 Correct 0 ms 344 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 1 ms 348 KB Output is correct
58 Correct 5 ms 1088 KB Output is correct
59 Correct 5 ms 1112 KB Output is correct
60 Correct 6 ms 1116 KB Output is correct
61 Correct 6 ms 964 KB Output is correct
62 Correct 6 ms 1116 KB Output is correct
63 Correct 6 ms 1184 KB Output is correct
64 Correct 6 ms 1116 KB Output is correct
65 Correct 6 ms 1216 KB Output is correct
66 Correct 5 ms 860 KB Output is correct
67 Correct 6 ms 1112 KB Output is correct
68 Correct 5 ms 956 KB Output is correct
69 Correct 5 ms 956 KB Output is correct
70 Correct 5 ms 1116 KB Output is correct
71 Correct 6 ms 1116 KB Output is correct
72 Correct 7 ms 1116 KB Output is correct
73 Correct 6 ms 860 KB Output is correct
74 Correct 6 ms 1112 KB Output is correct
75 Correct 5 ms 1116 KB Output is correct
76 Correct 5 ms 1116 KB Output is correct
77 Correct 4 ms 1116 KB Output is correct
78 Correct 4 ms 1072 KB Output is correct
79 Correct 1 ms 344 KB Output is correct
80 Correct 1 ms 348 KB Output is correct
81 Correct 1 ms 348 KB Output is correct
82 Correct 0 ms 348 KB Output is correct
83 Correct 1 ms 348 KB Output is correct
84 Correct 1 ms 348 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 0 ms 348 KB Output is correct
87 Correct 0 ms 348 KB Output is correct
88 Correct 0 ms 348 KB Output is correct
89 Correct 0 ms 348 KB Output is correct
90 Correct 0 ms 348 KB Output is correct
91 Correct 1 ms 348 KB Output is correct
92 Correct 1 ms 348 KB Output is correct
93 Correct 0 ms 348 KB Output is correct
94 Correct 0 ms 348 KB Output is correct
95 Correct 1 ms 344 KB Output is correct
96 Correct 0 ms 344 KB Output is correct
97 Correct 0 ms 348 KB Output is correct
98 Correct 0 ms 348 KB Output is correct
99 Correct 0 ms 348 KB Output is correct
100 Correct 0 ms 432 KB Output is correct
101 Correct 1 ms 348 KB Output is correct
102 Correct 0 ms 348 KB Output is correct
103 Correct 0 ms 348 KB Output is correct
104 Correct 0 ms 344 KB Output is correct
105 Correct 0 ms 348 KB Output is correct
106 Correct 0 ms 348 KB Output is correct
107 Correct 0 ms 348 KB Output is correct
108 Correct 1 ms 348 KB Output is correct
109 Correct 0 ms 348 KB Output is correct
110 Correct 15 ms 2212 KB Output is correct
111 Correct 15 ms 2264 KB Output is correct
112 Correct 15 ms 2244 KB Output is correct
113 Correct 15 ms 2516 KB Output is correct
114 Correct 17 ms 2620 KB Output is correct
115 Correct 17 ms 3028 KB Output is correct
116 Correct 16 ms 2516 KB Output is correct
117 Correct 17 ms 2520 KB Output is correct
118 Correct 15 ms 2264 KB Output is correct
119 Correct 20 ms 2272 KB Output is correct
120 Correct 15 ms 2264 KB Output is correct
121 Correct 14 ms 2236 KB Output is correct
122 Correct 15 ms 2264 KB Output is correct
123 Correct 15 ms 2260 KB Output is correct
124 Correct 15 ms 2260 KB Output is correct
125 Correct 15 ms 2188 KB Output is correct
126 Correct 15 ms 2264 KB Output is correct
127 Correct 14 ms 2260 KB Output is correct
128 Correct 16 ms 2264 KB Output is correct
129 Correct 10 ms 2424 KB Output is correct
130 Correct 10 ms 2396 KB Output is correct