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답안 #577723

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
577723 2022-06-15T08:23:58 Z tengiz05 Roads (CEOI20_roads) C++17
100 / 100
 188 ms 13324 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() {
    // freopen("input1.txt", "r", stdin);
    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;
        // cerr << "Checking " << x << " " << y << ", " << i << "\n";
            // for (auto x : s) {
                // cout << at(p[x.x]) << ", ";
            // }
            // cerr << "\nEnded\n";
        // cerr << "Checking " << x << " " << y << ", " << i << "\n";
            // for (auto x : s) {
                // cout << x.x << ", ";
            // }
            // cerr << "\nEnded\n";
        if (i > 0) {
            // cerr << prev(s.lower_bound(Info(i)))->x << ",";
            // cerr << next(s.lower_bound(Info(i)))->x << " ";
            auto &L = p[prev(s.upper_bound(Info(i)))->x];
            auto &R = p[s.upper_bound(Info(i))->x];
            // cerr << "HMM";
            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 {
            }
            // cerr << "NO";
            L.r = {x, y};
            R.l = {x, y};
            // cerr << "YAY";
            s.insert(Info(i));
            // cerr << "OK\n";
        } else {
            // cerr << "D";
            i = -i;
            // cerr << at(p[i]) << "\n";
            // assert(s.lower_bound(Info(i)) != s.end());
            // assert(s.lower_bound(Info(i))->x == i);
            // cerr << "s";
            // cerr << prev(s.lower_bound(Info(i)))->x << " ";
            // cerr << next(s.lower_bound(Info(i)))->x << " ";
            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

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 53 ms 5892 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 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 4176 KB Output is correct
5 Correct 26 ms 4836 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 3 ms 3436 KB Output is correct
3 Correct 3 ms 3540 KB Output is correct
4 Correct 12 ms 4244 KB Output is correct
5 Correct 20 ms 4936 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 17 ms 4220 KB Output is correct
10 Correct 169 ms 10380 KB Output is correct

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 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 4284 KB Output is correct
5 Correct 20 ms 4964 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 4 ms 3464 KB Output is correct
9 Correct 13 ms 4464 KB Output is correct
10 Correct 51 ms 8392 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 3 ms 3452 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct

Subtask #5
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3412 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 11 ms 4176 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 4508 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 3 ms 3412 KB Output is correct
12 Correct 3 ms 3464 KB Output is correct
13 Correct 11 ms 4560 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3452 KB Output is correct
16 Correct 2 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 3 ms 3412 KB Output is correct
19 Correct 3 ms 3456 KB Output is correct
20 Correct 3 ms 3540 KB Output is correct
21 Correct 2 ms 3452 KB Output is correct
22 Correct 7 ms 3848 KB Output is correct
23 Correct 7 ms 3884 KB Output is correct
24 Correct 12 ms 4244 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct

Subtask #6
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 62 ms 5900 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 3524 KB Output is correct
6 Correct 12 ms 4560 KB Output is correct
7 Correct 23 ms 5524 KB Output is correct
8 Correct 2 ms 3412 KB Output is correct
9 Correct 2 ms 3412 KB Output is correct
10 Correct 3 ms 3540 KB Output is correct
11 Correct 12 ms 4560 KB Output is correct
12 Correct 160 ms 13324 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 2 ms 3456 KB Output is correct
15 Correct 3 ms 3460 KB Output is correct
16 Correct 11 ms 4468 KB Output is correct
17 Correct 52 ms 8436 KB Output is correct
18 Correct 3 ms 3412 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 2 ms 3456 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 4 ms 3468 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct
26 Correct 9 ms 3884 KB Output is correct
27 Correct 8 ms 3848 KB Output is correct
28 Correct 13 ms 4160 KB Output is correct
29 Correct 78 ms 9088 KB Output is correct
30 Correct 133 ms 12240 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 109 ms 10380 KB Output is correct
33 Correct 112 ms 10392 KB Output is correct
34 Correct 141 ms 12528 KB Output is correct
35 Correct 188 ms 12944 KB Output is correct
36 Correct 180 ms 13116 KB Output is correct