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Submission #577724

# Submission time Handle Problem Language Result Execution time Memory
577724 2022-06-15T08:24:49 Z tengiz05 Roads (CEOI20_roads) C++17
100 / 100
 176 ms 11444 KB 
#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

constexpr int inf = 1E9;

int Time;

struct Line {
    int x, y;
    double s;
    pair<int, int> l, r;
    Line() {}
    Line(int x1, int y1, int x2, int y2) {
        x = x1;
        y = y1;
        if (x2 - x1 == 0) {
            s = 0;
        } else {
            s = 1. * (y2 - y1) / (x2 - x1);
        }
        l = r = {x1, y1};
    }
};
double at(const Line x) {
    return x.y + (Time - x.x) * x.s;
}
inline bool operator<(const Line &a, const Line &b) {
    if (at(a) - at(b) < -1e-10)
        return true;
    return false;
}

bool bad(const pair<int, int> &x) {
    return abs(x.first) == inf;
}
Line p[100005];
struct Info {
    int x;
    Info(int x) : x(x) {}
};
bool operator<(const Info &a, const Info &b) {
    return p[a.x] < p[b.x];
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n;
    cin >> n;
    
    vector<tuple<int, int, int>> events;
    
    vector<int> X1(n + 2), Y1(n + 2), X2(n + 2), Y2(n + 2);
    
    for (int i = 1; i <= n; i++) {
        int x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;
        if (x1 > x2) {
            swap(x1, x2);
            swap(y1, y2);
        } else if (x1 == x2 && y1 > y2) {
            swap(y1, y2);
        }
        events.emplace_back(x1, y1, i);
        events.emplace_back(x2, y2, -i);
        X1[i] = x1;
        Y1[i] = y1;
        X2[i] = x2;
        Y2[i] = y2;
    }
    
    sort(events.begin(), events.end());
    
    set<Info> s;
    p[0] = Line(-inf, -inf, inf, -inf);
    p[n + 1] = Line(-inf, inf, inf, inf);
    
    for (int i = 1; i <= n; i++) {
        p[i] = Line(X1[i], Y1[i], X2[i], Y2[i]);
    }
    s.insert(Info(0));
    s.insert(Info(n + 1));
    
    for (auto [x, y, i] : events) {
        Time = x;
        if (i > 0) {
            auto &L = p[prev(s.upper_bound(Info(i)))->x];
            auto &R = p[s.upper_bound(Info(i))->x];
            if (!bad(L.r)) {
                cout << x << " " << y << " " << L.r.first << " " << L.r.second << "\n";
            } else if (!bad(R.l)) {
                cout << x << " " << y << " " << R.l.first << " " << R.l.second << "\n";
            } else {
            }
            L.r = {x, y};
            R.l = {x, y};
            s.insert(Info(i));
        } else {
            i = -i;
            auto &L = p[prev(s.lower_bound(Info(i)))->x];
            auto &R = p[next(s.lower_bound(Info(i)))->x];
            L.r = {x, y};
            R.l = {x, y};
            s.erase(Info(i));
        }
    }
    
    return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 56 ms 5900 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 3 ms 3412 KB Output is correct
3 Correct 2 ms 3540 KB Output is correct
4 Correct 12 ms 4192 KB Output is correct
5 Correct 23 ms 4876 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 3 ms 3540 KB Output is correct
4 Correct 11 ms 4220 KB Output is correct
5 Correct 22 ms 4952 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 3 ms 3540 KB Output is correct
9 Correct 13 ms 4176 KB Output is correct
10 Correct 176 ms 10376 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 4 ms 3540 KB Output is correct
4 Correct 12 ms 4176 KB Output is correct
5 Correct 24 ms 4932 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 3 ms 3412 KB Output is correct
8 Correct 3 ms 3540 KB Output is correct
9 Correct 14 ms 4176 KB Output is correct
10 Correct 62 ms 6984 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 3 ms 3412 KB Output is correct
4 Correct 3 ms 3516 KB Output is correct
5 Correct 14 ms 4232 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 3 ms 3540 KB Output is correct
9 Correct 12 ms 4176 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 3 ms 3412 KB Output is correct
12 Correct 4 ms 3540 KB Output is correct
13 Correct 14 ms 4176 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 2 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 2 ms 3412 KB Output is correct
19 Correct 3 ms 3412 KB Output is correct
20 Correct 3 ms 3412 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 8 ms 3668 KB Output is correct
23 Correct 8 ms 3796 KB Output is correct
24 Correct 13 ms 4060 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 53 ms 6020 KB Output is correct
3 Correct 2 ms 3412 KB Output is correct
4 Correct 2 ms 3412 KB Output is correct
5 Correct 3 ms 3540 KB Output is correct
6 Correct 11 ms 4240 KB Output is correct
7 Correct 21 ms 4972 KB Output is correct
8 Correct 2 ms 3412 KB Output is correct
9 Correct 3 ms 3412 KB Output is correct
10 Correct 4 ms 3540 KB Output is correct
11 Correct 12 ms 4240 KB Output is correct
12 Correct 161 ms 10384 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 2 ms 3384 KB Output is correct
15 Correct 3 ms 3540 KB Output is correct
16 Correct 11 ms 4216 KB Output is correct
17 Correct 70 ms 6984 KB Output is correct
18 Correct 2 ms 3412 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 2 ms 3412 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 3 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 3 ms 3412 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct
26 Correct 6 ms 3668 KB Output is correct
27 Correct 6 ms 3788 KB Output is correct
28 Correct 11 ms 4052 KB Output is correct
29 Correct 81 ms 8236 KB Output is correct
30 Correct 111 ms 10264 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 106 ms 8124 KB Output is correct
33 Correct 118 ms 8236 KB Output is correct
34 Correct 150 ms 9752 KB Output is correct
35 Correct 140 ms 9948 KB Output is correct
36 Correct 146 ms 11444 KB Output is correct