oj.uz

답안 #414561

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
414561 2021-05-30T16:25:35 Z usachevd0 함박 스테이크 (JOI20_hamburg) C++17
15 / 100
 410 ms 21640 KB 
#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define Time (clock() * 1.0 / CLOCKS_PER_SEC)
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using ld = long double;
template<typename T1, typename T2> bool chkmin(T1& x, T2 y) {
    return y < x ? (x = y, true) : false;
}
template<typename T1, typename T2> bool chkmax(T1& x, T2 y) {
    return y > x ? (x = y, true) : false;
}
void debug_out() {
    cerr << endl;
}
template<typename T1, typename... T2> void debug_out(T1 A, T2... B) {
    cerr << ' ' << A;
    debug_out(B...);
}
template<typename T> void mdebug_out(T* a, int n) {
    for (int i = 0; i < n; ++i)
        cerr << a[i] << ' ';
    cerr << endl;
}
#ifdef LOCAL
    #define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
    #define mdebug(a, n) cerr << #a << ": ", mdebug_out(a, n)
#else
    #define debug(...) 1337
    #define mdebug(a, n) 1337
#endif
template<typename T> ostream& operator << (ostream& stream, const vector<T>& v) {
    for (auto& x : v)
        stream << x << ' ';
    return stream;
}
template<typename T1, typename T2> ostream& operator << (ostream& stream, const pair<T1, T2>& p) {
    return stream << p.first << ' ' << p.second;
}

const int INF32 = 1e9;

using Point = array<int, 2>;

using Segm = Point;
Segm universe_segm;
Segm intersect(const Segm& s1, const Segm& s2) {
    return {max(s1[0], s2[0]), min(s1[1], s2[1])};
}
void uintersect(Segm& s1, const Segm& s2) {
    chkmax(s1[0], s2[0]);
    chkmin(s1[1], s2[1]);
}
bool in(int x, const Segm& s) {
    return s[0] <= x && x <= s[1];
}
bool empt(const Segm& s) {
    return s[0] > s[1];
}

struct Rect {
    Segm s[2];
    
    Rect() {}
    
    void read() {
        cin >> s[0][0] >> s[1][0] >> s[0][1] >> s[1][1];
    }
    
    bool in(Point P) {
        return ::in(P[0], s[0]) && ::in(P[1], s[1]);
    }
} universe_rect;

Rect intersect(const Rect& r1, const Rect& r2) {
    Rect r3;
    for (int a = 0; a < 2; ++a) {
        r3.s[a][0] = max(r1.s[a][0], r2.s[a][0]);
        r3.s[a][1] = min(r1.s[a][1], r2.s[a][1]);
    }
    return r3;
}





vector<Point> solve(int k, vector<Rect> rects, vector<Point> points) {
    if (rects.empty()) {
        while (k--)
            points.push_back({0, 0});
        return points;
    }
    Rect I = universe_rect;
    for (Rect& r : rects)
        I = intersect(I, r);
    if (k == 1) {
        if (I.s[0][0] > I.s[0][1] || I.s[1][0] > I.s[1][1]) {
            return {};
        } else {
            points.push_back({I.s[0][0], I.s[1][0]});
            return points;
        }
    }
    for (int i = 0; i < 2; ++i) {
        for (int j = 0; j < 2; ++j) {
            Point P{I.s[0][i], I.s[1][j]};
            points.push_back(P);
            vector<Rect> new_rects;
            for (auto r : rects)
                if (!r.in(P))
                    new_rects.push_back(r);
            auto res = solve(k - 1, new_rects, points);
            if (!res.empty()) {
                return res;
            }
            points.pop_back();
        }
    }
    return {};
}

int32_t main() {
#ifdef LOCAL
    freopen("in", "r", stdin);
#endif
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    universe_rect.s[0][0] = universe_rect.s[1][0] = 0;
    universe_rect.s[0][1] = universe_rect.s[1][1] = +INF32;
    universe_segm = {0, +INF32};
    
    int n, k;
    cin >> n >> k;
    vector<int> rx;
    vector<Rect> rects(n);
    for (auto& r : rects) {
        r.read();
        for (int a = 0; a < 2; ++a)
            for (int b = 0; b < 2; ++b)
                rx.push_back(r.s[a][b]);
    }
    sort(all(rx));
    rx.resize(unique(all(rx)) - rx.begin());
    int X = rx.size();
    for (auto& r : rects)
        for (int a = 0; a < 2; ++a)
            for (int b = 0; b < 2; ++b)
                r.s[a][b] = lower_bound(all(rx), r.s[a][b]) - rx.begin();
    auto easy = solve(k, rects, {});
    if (!easy.empty()) {
        for (auto P : easy)
            cout << rx[P[0]] << ' ' << rx[P[1]] << '\n';
        exit(0);
    }
    assert(k == 4);
    Rect I = universe_rect;
    for (Rect& r : rects)
        I = intersect(I, r);
    int R = I.s[0][0], L = I.s[0][1];
    int U = I.s[1][0], D = I.s[1][1];
    assert(L < R);
    assert(D < U);
    
    Segm baseL = {D + 1, U - 1};
    Segm baseR = {D + 1, U - 1};
    Segm baseD = {L + 1, R - 1};
    Segm baseU = {L + 1, R - 1};
    
    vector<Segm> prefLR(X + 1, universe_segm);
    vector<Segm> suffLR(X + 1, universe_segm);
    vector<Segm> prefDU(X + 1, universe_segm); // also prefUD
    vector<Segm> prefLU(X + 1, universe_segm);
    vector<Segm> suffLD(X + 1, universe_segm);
    vector<Segm> prefUR(X + 1, universe_segm);
    vector<Segm> prefDR(X + 1, universe_segm);
    
    int minxUD = +INF32;
    for (Rect& r : rects) {
        Segm rx = I.s[0], ry = I.s[1];
        int touchL = in(L, rx);
        int touchR = in(R, rx);
        int touchD = in(D, ry);
        int touchU = in(U, ry);
        int sum = touchL + touchR + touchD + touchU;
        // if (sum == 0) throw;
        if (sum >= 3) continue;
        if (sum == 1) {
            if (touchL) {
                uintersect(baseL, ry);
            } else if (touchR) {
                uintersect(baseR, ry);
            } else if (touchD) {
                uintersect(baseD, rx);
            } else { // touchU
                uintersect(baseU, rx);
            }
        } else { // sum = 2
            if (touchL && touchR) {
                uintersect(prefLR[ry[0]], ry);
                uintersect(suffLR[ry[1] + 1], ry);
            } else if (touchD && touchU) {
                chkmin(minxUD, rx[1]);
                uintersect(prefDU[rx[0]], rx);
            } else if (touchL && touchU) {
                uintersect(prefLU[ry[0]], rx);
            } else if (touchL && touchD) {
                uintersect(suffLD[ry[1] + 1], rx);
            } else if (touchU && touchR) {
                uintersect(prefUR[rx[0]], ry);
            } else if (touchD && touchR) {
                uintersect(prefDR[rx[0]], ry);
            }
        }
    }
    
    for (int x = 0; x < X; ++x) {
        uintersect(suffLR[x + 1], suffLR[x]);
        uintersect(suffLD[x + 1], suffLD[x]);
    }
    for (int x = X - 1; x >= 0; --x) {
        uintersect(prefLR[x], prefLR[x + 1]);
        uintersect(prefDU[x], prefDU[x + 1]);
        uintersect(prefLU[x], prefLU[x + 1]);
        uintersect(prefUR[x], prefUR[x + 1]);
        uintersect(prefDR[x], prefDR[x + 1]);
    }
    
    for (int l = baseL[0]; l <= baseL[1]; ++l) {
        for (int rotUD = 0; rotUD < 2; ++rotUD) {
            auto segmU = intersect(baseU, prefLU[l + 1]);
            auto segmD = intersect(baseD, suffLD[l]);
            auto segmR = intersect(intersect(baseD, prefLR[l + 1]), suffLR[l]);
            int d, u;
            if (rotUD == 0) {
                // U <= D
                u = min(segmU[1], minxUD);
                if (u < segmU[0]) continue;
                uintersect(segmD, prefDU[u + 1]);
                uintersect(segmR, prefUR[u + 1]);
                if (empt(segmD)) continue;
                d = segmD[1];
                if (d < u) continue;
                uintersect(segmR, prefDR[d + 1]);
            } else {
                // U >= D
                d = min(segmD[1], minxUD);
                if (d < segmD[0]) continue;
                uintersect(segmU, prefDU[d + 1]);
                uintersect(segmR, prefDR[d + 1]);
                if (empt(segmU)) continue;
                u = segmU[1];
                if (u < d) continue;
                uintersect(segmR, prefUR[u + 1]);
            }
            if (empt(segmR)) continue;
            int r = segmR[1];
            cout << L << ' ' << rx[l] << '\n';
            cout << R << ' ' << rx[r] << '\n';
            cout << rx[d] << ' ' << D << '\n';
            cout << rx[u] << ' ' << U << '\n';
            exit(0);
        }
    }
    // throw;
    
    return 0;
}

Compilation message

hamburg.cpp: In function 'int32_t main()':
hamburg.cpp:191:16: warning: unused variable 'r' [-Wunused-variable]
  191 |     for (Rect& r : rects) {
      |                ^

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 4 ms 332 KB Output is correct
3 Correct 3 ms 324 KB Output is correct
4 Correct 3 ms 332 KB Output is correct

Subtask #2
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 3 ms 460 KB Output is correct

Subtask #3
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 3 ms 460 KB Output is correct
4 Correct 4 ms 332 KB Output is correct
5 Correct 3 ms 396 KB Output is correct
6 Correct 3 ms 332 KB Output is correct
7 Correct 4 ms 460 KB Output is correct
8 Correct 4 ms 460 KB Output is correct
9 Correct 4 ms 460 KB Output is correct
10 Correct 3 ms 460 KB Output is correct
11 Correct 3 ms 460 KB Output is correct
12 Correct 3 ms 460 KB Output is correct

Subtask #4
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 4 ms 460 KB Output is correct
4 Correct 4 ms 332 KB Output is correct
5 Correct 4 ms 460 KB Output is correct
6 Correct 3 ms 332 KB Output is correct
7 Correct 3 ms 460 KB Output is correct
8 Correct 5 ms 588 KB Output is correct
9 Correct 4 ms 460 KB Output is correct
10 Correct 6 ms 588 KB Output is correct
11 Correct 6 ms 588 KB Output is correct
12 Correct 4 ms 460 KB Output is correct
13 Correct 3 ms 460 KB Output is correct
14 Incorrect 5 ms 844 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #5
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 4 ms 332 KB Output is correct
3 Correct 3 ms 324 KB Output is correct
4 Correct 3 ms 332 KB Output is correct
5 Correct 354 ms 9776 KB Output is correct
6 Correct 335 ms 9784 KB Output is correct
7 Correct 339 ms 9800 KB Output is correct
8 Correct 331 ms 9784 KB Output is correct

Subtask #6
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 3 ms 460 KB Output is correct
5 Correct 330 ms 13300 KB Output is correct
6 Correct 334 ms 13556 KB Output is correct
7 Correct 332 ms 13260 KB Output is correct
8 Correct 362 ms 15896 KB Output is correct

Subtask #7
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 3 ms 460 KB Output is correct
4 Correct 4 ms 332 KB Output is correct
5 Correct 3 ms 396 KB Output is correct
6 Correct 3 ms 332 KB Output is correct
7 Correct 4 ms 460 KB Output is correct
8 Correct 4 ms 460 KB Output is correct
9 Correct 4 ms 460 KB Output is correct
10 Correct 3 ms 460 KB Output is correct
11 Correct 3 ms 460 KB Output is correct
12 Correct 3 ms 460 KB Output is correct
13 Correct 361 ms 14888 KB Output is correct
14 Correct 331 ms 14904 KB Output is correct
15 Correct 346 ms 15540 KB Output is correct
16 Correct 343 ms 13100 KB Output is correct
17 Correct 349 ms 13872 KB Output is correct
18 Correct 361 ms 11960 KB Output is correct
19 Correct 344 ms 15796 KB Output is correct
20 Correct 410 ms 21640 KB Output is correct
21 Correct 359 ms 15796 KB Output is correct
22 Correct 371 ms 20920 KB Output is correct
23 Correct 369 ms 20792 KB Output is correct
24 Correct 394 ms 20280 KB Output is correct

Subtask #8
0 / 79.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 4 ms 460 KB Output is correct
4 Correct 4 ms 332 KB Output is correct
5 Correct 4 ms 460 KB Output is correct
6 Correct 3 ms 332 KB Output is correct
7 Correct 3 ms 460 KB Output is correct
8 Correct 5 ms 588 KB Output is correct
9 Correct 4 ms 460 KB Output is correct
10 Correct 6 ms 588 KB Output is correct
11 Correct 6 ms 588 KB Output is correct
12 Correct 4 ms 460 KB Output is correct
13 Correct 3 ms 460 KB Output is correct
14 Incorrect 5 ms 844 KB Output isn't correct
15 Halted 0 ms 0 KB -