oj.uz

Submission #419325

# Submission time Handle Problem Language Result Execution time Memory
419325 2021-06-06T23:07:17 Z 2qbingxuan Cultivation (JOI17_cultivation) C++14
15 / 100
 2000 ms 676 KB 
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#ifdef local
#define safe cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
#define pary(a...) danb(#a, a)
#define debug(a...) qqbx(#a, a)
template <typename ...T> void qqbx(const char *s, T ...a) {
    int cnt = sizeof...(T);
    ((std::cerr << "\033[1;32m(" << s << ") = (") , ... , (std::cerr << a << (--cnt ? ", " : ")\033[0m\n")));
}
template <typename T> void danb(const char *s, T L, T R) {
    std::cerr << "\033[1;32m[ " << s << " ] = [ ";
    for (int f = 0; L != R; ++L)
        std::cerr << (f++ ? ", " : "") << *L;
    std::cerr << " ]\033[0m\n";
}
#else
#define debug(...) ((void)0)
#define safe ((void)0)
#define pary(...) ((void)0)
#endif // local
#define all(v) begin(v),end(v)
#define pb emplace_back
#define get_pos(u,x) int(lower_bound(all(u),x)-begin(u))

using namespace std;
using ll = int_fast64_t;
using ld = long double;
template <typename T> using min_heap = priority_queue<T, vector<T>, greater<T>>;
const int mod = 1000000007;
const int inf = 1e9;
const ll INF = 1e18;
const int maxn = 5025;
template <typename T> void sort_uni(T &v) { sort(all(v)), v.erase(unique(all(v)), v.end()); }

int solve(int R, int C, vector<pair<int,int>> pts) {
    int N = pts.size();
    auto proc = [&]() {
        sort(all(pts));

        vector<int> dx{0};
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < i; j++) {
                dx.emplace_back(pts[i].first - pts[j].first - 1);
            }
            dx.emplace_back(pts[i].first - 1);
            dx.emplace_back(R - pts[i].first);
        }
        sort_uni(dx);

        int mina = pts[0].first - 1;
        int minb = R - pts[N-1].first;
        int minsum = 0;
        for (int i = 1; i < N; i++) minsum = max(minsum, pts[i].first - pts[i-1].first - 1);
        debug(mina, minb, minsum);
        pary(all(dx));

        auto calc = [&](int a, int b) {
            vector<pair<int,int>> evt;
            evt.reserve(N*2);
            for (auto [x, y]: pts) evt.emplace_back(x-a, y);
            for (auto [x, y]: pts) evt.emplace_back(x+b+1, -y);
            inplace_merge(evt.begin(), evt.begin() + N, evt.end());

            vector<int> posy;

            auto add = [&](int val) {
                auto it = lower_bound(all(posy), val);
                posy.insert(it, val);
                assert( is_sorted(all(posy)) );
            };
            auto remove = [&](int val) {
                posy.erase(find(all(posy), val));
            };
            int ans = 0, minc = 0, mind = 0;
            for (int i = 0, j = 0; i < N*2; i = j) {
                for (j = i; j < N*2; j++) {
                    if (evt[j].first != evt[i].first) break;
                    int y = evt[j].second;
                    if (y < 0) {
                        remove(-y);
                    } else {
                        add(y);
                    }
                }
                if (j == N*2) continue;
                int l = evt[i].first;
                int r = evt[j].first;
                if (r <= 1 || l > R) continue;
                assert (posy.size() > 0);
                minc = max(minc, posy.front() - 1);
                mind = max(mind, C - posy.back());
                if (posy.size() >= 2) {
                    for (int k = 1; k < posy.size(); k++) {
                        ans = max(ans, posy[k] - posy[k-1] - 1);
                    }
                }
            }
            ans = max(ans, minc + mind);
            return ans;
            debug(a, b, ans);
            debug(minc, mind);
        };
        int res = 2e9;
        for (int a: dx) {
            if (a < mina) continue;
            for (int b: dx) {
                if (b < minb) continue;
                if (a + b < minsum) continue;
                res = min<ll>(res, 0LL + a + b + calc(a, b));
            }
        }

        for (int a: dx) {
            if (a < mina) continue;
            for (int d: dx) {
                if (d < a) continue;
                int b = d - a;
                if (b < minb || a + b < minsum) continue;
                res = min<ll>(res, 0LL + a + b + calc(a, b));
            }
        }

        return res;
    };
    // int res = proc();
    // for (auto &[x, y]: pts) swap(x, y);
    // swap(R, C);
    // return min(res, proc());
    return proc();
}

int naive(int R, int C, vector<pair<int,int>> pts) {
    int grid = 0;
    for (auto [x, y]: pts) grid |= 1<<((x-1) * C + (y-1));
    unordered_map<int,int> dis;
    const int U = (1 << (R*C)) - 1;
    queue<int> q;
    dis[grid] = 0;
    q.push(grid);

    int mask1 = 0, mask2 = 0;
    for (int i = 0; i < R; i++) for (int j = 0; j < C; j++) {
        if (j - 1 >= 0)
            mask1 |= 1 << (i * C + j);
        if (j + 1 < C)
            mask2 |= 1 << (i * C + j);
    }
    while (!q.empty()) {
        int cur = q.front(); q.pop();
        if (int nxt = (cur | cur << C) & U; !dis.count(nxt))
            dis[nxt] = dis[cur] + 1, q.push(nxt);

        if (int nxt = (cur | cur >> C); !dis.count(nxt))
            dis[nxt] = dis[cur] + 1, q.push(nxt);

        if (int nxt = cur | ((cur & mask1) >> 1); !dis.count(nxt))
            dis[nxt] = dis[cur] + 1, q.push(nxt);

        if (int nxt = cur | ((cur & mask2) << 1); !dis.count(nxt))
            dis[nxt] = dis[cur] + 1, q.push(nxt);
    }
    return dis[U];
}
void verify() {
    int R, C;
    cin >> R >> C;
    for (int i = 1; i < (1<<(R*C)); i++) {
        vector<pair<int,int>> pts;
        for (int j = 0; j < R*C; j++) if (i >> j & 1) pts.emplace_back(j / C + 1, j % C + 1);
        int na = naive(R, C, pts);
        int ca = solve(R, C, pts);
        if (na != ca) {
            debug(na, ca);
            for (auto [x, y]: pts) cerr<<x<<','<<y<<'\n';
            exit(3);
        }
    }
    exit(0);
}
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    // verify();

    int R, C, N;
    cin >> R >> C >> N;
    vector<pair<int,int>> pts(N);
    for (auto &[x, y]: pts) cin >> x >> y;
    cerr << naive(R, C, pts) << '\n';
    cout << solve(R, C, pts) << '\n';
}

/*
   4 4 2
   1 2
   2 1

   4 3 2
   1 1
   1 3

   10 1 2
   2 1
   8 1
   */

Compilation message

cultivation.cpp: In lambda function:
cultivation.cpp:61:23: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   61 |             for (auto [x, y]: pts) evt.emplace_back(x-a, y);
      |                       ^
cultivation.cpp:62:23: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   62 |             for (auto [x, y]: pts) evt.emplace_back(x+b+1, -y);
      |                       ^
cultivation.cpp:94:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |                     for (int k = 1; k < posy.size(); k++) {
      |                                     ~~^~~~~~~~~~~~~
cultivation.cpp: In function 'int naive(int, int, std::vector<std::pair<int, int> >)':
cultivation.cpp:135:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  135 |     for (auto [x, y]: pts) grid |= 1<<((x-1) * C + (y-1));
      |               ^
cultivation.cpp:151:13: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17'
  151 |         if (int nxt = (cur | cur << C) & U; !dis.count(nxt))
      |             ^~~
cultivation.cpp:154:13: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17'
  154 |         if (int nxt = (cur | cur >> C); !dis.count(nxt))
      |             ^~~
cultivation.cpp:157:13: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17'
  157 |         if (int nxt = cur | ((cur & mask1) >> 1); !dis.count(nxt))
      |             ^~~
cultivation.cpp:160:13: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17'
  160 |         if (int nxt = cur | ((cur & mask2) << 1); !dis.count(nxt))
      |             ^~~
cultivation.cpp: In function 'void verify()':
cultivation.cpp:175:23: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  175 |             for (auto [x, y]: pts) cerr<<x<<','<<y<<'\n';
      |                       ^
cultivation.cpp: In function 'int main()':
cultivation.cpp:188:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  188 |     for (auto &[x, y]: pts) cin >> x >> y;
      |                ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 7 ms 348 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 11 ms 332 KB Output is correct
22 Correct 41 ms 332 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 91 ms 460 KB Output is correct
25 Correct 57 ms 332 KB Output is correct
26 Correct 164 ms 592 KB Output is correct
27 Correct 159 ms 592 KB Output is correct
28 Correct 84 ms 508 KB Output is correct
29 Correct 151 ms 592 KB Output is correct
30 Correct 163 ms 592 KB Output is correct
31 Correct 162 ms 592 KB Output is correct
32 Correct 164 ms 592 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 7 ms 348 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 11 ms 332 KB Output is correct
22 Correct 41 ms 332 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 91 ms 460 KB Output is correct
25 Correct 57 ms 332 KB Output is correct
26 Correct 164 ms 592 KB Output is correct
27 Correct 159 ms 592 KB Output is correct
28 Correct 84 ms 508 KB Output is correct
29 Correct 151 ms 592 KB Output is correct
30 Correct 163 ms 592 KB Output is correct
31 Correct 162 ms 592 KB Output is correct
32 Correct 164 ms 592 KB Output is correct
33 Correct 323 ms 676 KB Output is correct
34 Execution timed out 2076 ms 204 KB Time limit exceeded
35 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2075 ms 204 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2075 ms 204 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 7 ms 348 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 11 ms 332 KB Output is correct
22 Correct 41 ms 332 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 91 ms 460 KB Output is correct
25 Correct 57 ms 332 KB Output is correct
26 Correct 164 ms 592 KB Output is correct
27 Correct 159 ms 592 KB Output is correct
28 Correct 84 ms 508 KB Output is correct
29 Correct 151 ms 592 KB Output is correct
30 Correct 163 ms 592 KB Output is correct
31 Correct 162 ms 592 KB Output is correct
32 Correct 164 ms 592 KB Output is correct
33 Correct 323 ms 676 KB Output is correct
34 Execution timed out 2076 ms 204 KB Time limit exceeded
35 Halted 0 ms 0 KB -