oj.uz

Submission #418870

# Submission time Handle Problem Language Result Execution time Memory
418870 2021-06-06T06:47:56 Z Kevin_Zhang_TW Cultivation (JOI17_cultivation) C++17
55 / 100
 2000 ms 628 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

const int MAX_N = 305;

#define int ll
const int inf = 1ll << 55;
int R, C, n;
vector<pair<int,int>> loc;

bool can_cover(int ul, int dl, int al, int bl) {

	vector<vector<int>> pf_sum(50, vector<int> (50) );
	for (auto [x, y] : loc) {
		int A = y - ul, B = y + dl;
		int C = x - bl, D = x + al;
		chmax(A, 1ll);
		chmax(C, 1ll);
		chmin(D, R);
		chmin(B, ::C);
		++pf_sum[C][A];
		--pf_sum[D+1][A];
		--pf_sum[C][B+1];
		++pf_sum[D+1][B+1];
	}

	for (int i = 1;i <= R;++i) {
		for (int j = 1;j <= C;++j) {
			pf_sum[i][j] += pf_sum[i-1][j] + pf_sum[i][j-1] - pf_sum[i-1][j-1];
			if (pf_sum[i][j] == 0) return false;
		}
	}
	return true;
}

int cal_up(int ul) {
	int dnmn = 0;
	{
		vector<int> ys;
		for (auto [x, y] : loc)
			ys.pb(y - ul);
		sort(AI(ys));
		int lst_end = 0;
		for (int y : ys) {
			chmax(dnmn, y - 1 - lst_end);
			lst_end = y + ul;
		}
		chmax(dnmn, C - lst_end);
	}

	vector<vector<tuple<int,int,int>>> op2, must;
	vector<int> sep;

	DE(ul);
	auto all_op = [&]() {
		op2.pb();
		must.pb();
		sort(AI(loc));

		for (int i = 0;i < n;++i) {
			auto [x, y] = loc[i];

			DE(" gen ------------ ", x, y);
			auto segmx = [&](int l, int r, int v) {
				chmax(l, dnmn);
				chmin(r, C);
				if (l > r) return;
				DE("segmx", l, r, v - x - 1);

				sep.pb(l), sep.pb(r+1);
				op2.back().pb(l, r+1, v - x - 1);
			};
			auto allmx = [&](int l, int r, int v) {
				chmax(l, dnmn);
				chmin(r, C);
				if (l > r) return;
				DE("mustmx", l, r, v - x - 1);

				sep.pb(l), sep.pb(r+1);
				must.back().pb(l, r+1, v - x - 1);
			};

			set<int> ys;
			ys.insert(-inf);
			ys.insert(inf);

			int nl = 1, nr = C;
			for (int j = i+1;j < n;++j) {
				auto [cx, cy] = loc[j];
				if (cx == x) continue;

				if (cy <= y) chmax(nl, cy + 1);
				if (cy >= y) chmin(nr, cy - ul - 1);

				auto it = ys.lower_bound(cy);
				int ly = *prev(it), ry = *it;  ys.insert(cy);
				DE(cx, cy, ly, ry);
				int s = 0, e = min(C - ly - 1, (ry - ul - 1) - ly - 1);
				if (cy >= y) chmax(s, cy - ul - y);
				else chmax(s, y - ul - cy);
				if (y <= ly || ry <= y || s > e || ry == cy || ry - ul <= 1) continue;
				segmx(s, e, cx);
			}

			DE(nl, nr);

			if (nl > nr) continue;
			if (nl == 1) allmx(0, C, R + 1);
			else if (nl <= nr) allmx(0, nr - nl, R + 1);

		}

		DE(op2.size());
		for (auto [l, r, v] : op2.back()) {
			DE(l, r, v);
		}
   	};

	all_op();
	for (auto &[x, y] : loc) 
		x = R - x + 1;

	all_op();
	for (auto &[x, y] : loc) 
		x = R - x + 1;

	sep.pb(C+1);

	sort(AI(sep)); sep.erase(unique(AI(sep)), end(sep));

	priority_queue<pair<int,int>> pq[2], pq2[2];
	sort(AI(op2[0]));
	sort(AI(op2[1]));
	sort(AI(must[0]));
	sort(AI(must[1]));

	int h[2]{}, h2[2]{};

	int res = inf;
	for (int i = 0;i+1 < sep.size();++i) {
		auto add_in = [&](auto &pq, auto &op, int &i) {
			for (;i < op.size();++i) {
				auto [l, r, v] = op[i];
				if (l > sep[i]) break;
				pq.emplace(v, r);
			}
		};
		auto pops = [&](auto &pq) -> ll{
			while (pq.size() && pq.top().second <= sep[i])
				pq.pop();
			return pq.size() ? pq.top().first : 0;
		};

		add_in(pq[0], op2[0], h[0]);
		add_in(pq[1], op2[1], h[1]);
		add_in(pq2[0], must[0], h2[0]);
		add_in(pq2[1], must[1], h2[1]);


		int ld = pops(pq2[0]), rd = max(pops(pq2[1]), max(pops(pq[0]), pops(pq[1])) - ld), dl = sep[i];

		chmin(res, sep[i] + ul + ld + rd);

	}
	return res;
}
int brute() {
	int res = inf;
	for (int ul = 0;ul <= C;++ul) for (int dl = 0;dl <= C;++dl) {
		int A = R, B = R;
		while (A > 0 && can_cover(ul, dl, A-1, B)) --A;
		while (B > 0 && can_cover(ul, dl, A, B-1)) --B;
		if (can_cover(ul, dl, A, B)) {
			if (chmin(res, ul + dl + A + B))
				DE(ul, dl, A, B);
		}
	}
	return res;
}
int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> R >> C >> n; loc.resize(n);
	for (auto &[x, y] : loc) {
		cin >> x >> y;
	}
	sort(AI(loc));

	int res = inf;

	vector<int> ys;
	for (auto [x, y] : loc) ys.pb(y);



	for (int y : ys) {
		chmin(res, cal_up(y - 1));
	}

	cout << res << '\n';
}

Compilation message

cultivation.cpp: In function 'll cal_up(ll)':
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:68:2: note: in expansion of macro 'DE'
   68 |  DE(ul);
      |  ^~
cultivation.cpp: In lambda function:
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:77:4: note: in expansion of macro 'DE'
   77 |    DE(" gen ------------ ", x, y);
      |    ^~
cultivation.cpp: In lambda function:
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:82:5: note: in expansion of macro 'DE'
   82 |     DE("segmx", l, r, v - x - 1);
      |     ^~
cultivation.cpp: In lambda function:
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:91:5: note: in expansion of macro 'DE'
   91 |     DE("mustmx", l, r, v - x - 1);
      |     ^~
cultivation.cpp: In lambda function:
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:111:5: note: in expansion of macro 'DE'
  111 |     DE(cx, cy, ly, ry);
      |     ^~
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:119:4: note: in expansion of macro 'DE'
  119 |    DE(nl, nr);
      |    ^~
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:127:3: note: in expansion of macro 'DE'
  127 |   DE(op2.size());
      |   ^~
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:129:4: note: in expansion of macro 'DE'
  129 |    DE(l, r, v);
      |    ^~
cultivation.cpp:128:13: warning: structured binding declaration set but not used [-Wunused-but-set-variable]
  128 |   for (auto [l, r, v] : op2.back()) {
      |             ^~~~~~~~~
cultivation.cpp: In function 'll cal_up(ll)':
cultivation.cpp:154:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  154 |  for (int i = 0;i+1 < sep.size();++i) {
      |                 ~~~~^~~~~~~~~~~~
cultivation.cpp: In instantiation of 'cal_up(ll)::<lambda(auto:23&, auto:24&, ll&)> [with auto:23 = std::priority_queue<std::pair<long long int, long long int> >; auto:24 = std::vector<std::tuple<long long int, long long int, long long int> >; ll = long long int]':
cultivation.cpp:168:29:   required from here
cultivation.cpp:156:12: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::tuple<long long int, long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  156 |    for (;i < op.size();++i) {
      |          ~~^~~~~~~~~~~
cultivation.cpp:174:86: warning: unused variable 'dl' [-Wunused-variable]
  174 |   int ld = pops(pq2[0]), rd = max(pops(pq2[1]), max(pops(pq[0]), pops(pq[1])) - ld), dl = sep[i];
      |                                                                                      ^~
cultivation.cpp: In function 'll brute()':
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:189:5: note: in expansion of macro 'DE'
  189 |     DE(ul, dl, A, B);
      |     ^~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 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 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 256 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
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 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 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 256 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 2 ms 204 KB Output is correct
18 Correct 36 ms 368 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 2 ms 204 KB Output is correct
21 Correct 14 ms 348 KB Output is correct
22 Correct 189 ms 416 KB Output is correct
23 Correct 5 ms 332 KB Output is correct
24 Correct 780 ms 480 KB Output is correct
25 Correct 384 ms 420 KB Output is correct
26 Execution timed out 2071 ms 628 KB Time limit exceeded
27 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 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 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 256 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 2 ms 204 KB Output is correct
18 Correct 36 ms 368 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 2 ms 204 KB Output is correct
21 Correct 14 ms 348 KB Output is correct
22 Correct 189 ms 416 KB Output is correct
23 Correct 5 ms 332 KB Output is correct
24 Correct 780 ms 480 KB Output is correct
25 Correct 384 ms 420 KB Output is correct
26 Execution timed out 2071 ms 628 KB Time limit exceeded
27 Halted 0 ms 0 KB -

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 3 ms 204 KB Output is correct
4 Correct 3 ms 204 KB Output is correct
5 Correct 3 ms 332 KB Output is correct
6 Correct 3 ms 332 KB Output is correct
7 Correct 3 ms 332 KB Output is correct
8 Correct 3 ms 204 KB Output is correct
9 Correct 3 ms 204 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 4 ms 332 KB Output is correct
12 Correct 3 ms 332 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 3 ms 204 KB Output is correct
15 Correct 3 ms 204 KB Output is correct
16 Correct 3 ms 332 KB Output is correct
17 Correct 3 ms 204 KB Output is correct
18 Correct 3 ms 332 KB Output is correct
19 Correct 3 ms 332 KB Output is correct
20 Correct 2 ms 204 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 3 ms 332 KB Output is correct
3 Correct 3 ms 204 KB Output is correct
4 Correct 3 ms 204 KB Output is correct
5 Correct 3 ms 332 KB Output is correct
6 Correct 3 ms 332 KB Output is correct
7 Correct 3 ms 332 KB Output is correct
8 Correct 3 ms 204 KB Output is correct
9 Correct 3 ms 204 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 4 ms 332 KB Output is correct
12 Correct 3 ms 332 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 3 ms 204 KB Output is correct
15 Correct 3 ms 204 KB Output is correct
16 Correct 3 ms 332 KB Output is correct
17 Correct 3 ms 204 KB Output is correct
18 Correct 3 ms 332 KB Output is correct
19 Correct 3 ms 332 KB Output is correct
20 Correct 2 ms 204 KB Output is correct
21 Correct 156 ms 444 KB Output is correct
22 Correct 155 ms 412 KB Output is correct
23 Correct 151 ms 332 KB Output is correct
24 Correct 147 ms 332 KB Output is correct
25 Correct 155 ms 520 KB Output is correct
26 Correct 102 ms 368 KB Output is correct
27 Correct 137 ms 360 KB Output is correct
28 Correct 156 ms 384 KB Output is correct
29 Correct 168 ms 452 KB Output is correct
30 Correct 189 ms 420 KB Output is correct
31 Correct 154 ms 440 KB Output is correct
32 Correct 149 ms 416 KB Output is correct
33 Correct 106 ms 340 KB Output is correct
34 Correct 158 ms 332 KB Output is correct
35 Correct 134 ms 352 KB Output is correct
36 Correct 153 ms 352 KB Output is correct

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 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 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 256 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 2 ms 204 KB Output is correct
18 Correct 36 ms 368 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 2 ms 204 KB Output is correct
21 Correct 14 ms 348 KB Output is correct
22 Correct 189 ms 416 KB Output is correct
23 Correct 5 ms 332 KB Output is correct
24 Correct 780 ms 480 KB Output is correct
25 Correct 384 ms 420 KB Output is correct
26 Execution timed out 2071 ms 628 KB Time limit exceeded
27 Halted 0 ms 0 KB -