oj.uz

Submission #418876

# Submission time Handle Problem Language Result Execution time Memory
418876 2021-06-06T06:53:50 Z Kevin_Zhang_TW Cultivation (JOI17_cultivation) C++17
55 / 100
 2000 ms 852 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];

			auto segmx = [&](int l, int r, int v) {
				chmax(l, dnmn);
				chmin(r, C);
				if (l > r) return;

				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;

				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);
				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);
			}

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

		}
   	};

	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];

	op2[0].insert(end(op2[0]), AI(op2[1]));
	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[0], op2[1], h[1]);
		//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 + 
				max(max(pops(pq[0]), pops(pq[1])), pops(pq2[0]) + pops(pq2[1])));
		//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:145:21: 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]
  145 |  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:159:29:   required from here
cultivation.cpp:147:12: 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]
  147 |    for (;i < op.size();++i) {
      |          ~~^~~~~~~~~~~
cultivation.cpp: In function 'll brute()':
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:184:5: note: in expansion of macro 'DE'
  184 |     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 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 1 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
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 1 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 2 ms 204 KB Output is correct
18 Correct 35 ms 372 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 3 ms 204 KB Output is correct
21 Correct 16 ms 244 KB Output is correct
22 Correct 192 ms 452 KB Output is correct
23 Correct 5 ms 352 KB Output is correct
24 Correct 806 ms 576 KB Output is correct
25 Correct 376 ms 464 KB Output is correct
26 Execution timed out 2075 ms 852 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 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 1 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 2 ms 204 KB Output is correct
18 Correct 35 ms 372 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 3 ms 204 KB Output is correct
21 Correct 16 ms 244 KB Output is correct
22 Correct 192 ms 452 KB Output is correct
23 Correct 5 ms 352 KB Output is correct
24 Correct 806 ms 576 KB Output is correct
25 Correct 376 ms 464 KB Output is correct
26 Execution timed out 2075 ms 852 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 332 KB Output is correct
4 Correct 2 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 3 ms 332 KB Output is correct
12 Correct 3 ms 332 KB Output is correct
13 Correct 2 ms 204 KB Output is correct
14 Correct 3 ms 332 KB Output is correct
15 Correct 3 ms 324 KB Output is correct
16 Correct 3 ms 332 KB Output is correct
17 Correct 3 ms 332 KB Output is correct
18 Correct 3 ms 332 KB Output is correct
19 Correct 3 ms 204 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 332 KB Output is correct
4 Correct 2 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 3 ms 332 KB Output is correct
12 Correct 3 ms 332 KB Output is correct
13 Correct 2 ms 204 KB Output is correct
14 Correct 3 ms 332 KB Output is correct
15 Correct 3 ms 324 KB Output is correct
16 Correct 3 ms 332 KB Output is correct
17 Correct 3 ms 332 KB Output is correct
18 Correct 3 ms 332 KB Output is correct
19 Correct 3 ms 204 KB Output is correct
20 Correct 2 ms 204 KB Output is correct
21 Correct 151 ms 436 KB Output is correct
22 Correct 156 ms 440 KB Output is correct
23 Correct 157 ms 452 KB Output is correct
24 Correct 147 ms 376 KB Output is correct
25 Correct 168 ms 548 KB Output is correct
26 Correct 105 ms 404 KB Output is correct
27 Correct 117 ms 580 KB Output is correct
28 Correct 158 ms 460 KB Output is correct
29 Correct 152 ms 464 KB Output is correct
30 Correct 157 ms 460 KB Output is correct
31 Correct 158 ms 548 KB Output is correct
32 Correct 152 ms 476 KB Output is correct
33 Correct 101 ms 464 KB Output is correct
34 Correct 141 ms 380 KB Output is correct
35 Correct 126 ms 376 KB Output is correct
36 Correct 157 ms 432 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 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 1 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 2 ms 204 KB Output is correct
18 Correct 35 ms 372 KB Output is correct
19 Correct 4 ms 204 KB Output is correct
20 Correct 3 ms 204 KB Output is correct
21 Correct 16 ms 244 KB Output is correct
22 Correct 192 ms 452 KB Output is correct
23 Correct 5 ms 352 KB Output is correct
24 Correct 806 ms 576 KB Output is correct
25 Correct 376 ms 464 KB Output is correct
26 Execution timed out 2075 ms 852 KB Time limit exceeded
27 Halted 0 ms 0 KB -