oj.uz

Submission #418851

# Submission time Handle Problem Language Result Execution time Memory
418851 2021-06-06T06:06:04 Z Kevin_Zhang_TW Cultivation (JOI17_cultivation) C++17
5 / 100
 3 ms 460 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);

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


		DE(sep[i], ul, 
				max(pops(pq[0]), pops(pq[1])), pops(pq2[0]) + pops(pq2[1]));

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

		//assert(can_cover(ld, rd, ul, dn));
		assert(can_cover(ul, sep[i], ld, rd));

		chmin(res, sep[i] + ul +
				max({pops(pq[0]), pops(pq[1]), pops(pq2[0]) + pops(pq2[1])}));

	}
	DE(ul, res);
	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 ul = 0;ul <= C;++ul) for (int dl = 0;dl <= C;++dl) {
//		int A = R, B = R;
//		while (B > 0 && can_cover(ul, dl, A, B-1)) --B;
//		while (A > 0 && can_cover(ul, dl, A-1, B)) --A;
//		if (can_cover(ul, dl, A, B))
//			chmin(res, ul + dl + A + B);
//	}

	// location should be the same
	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:109:5: note: in expansion of macro 'DE'
  109 |     DE(cx, cy);
      |     ^~
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:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:174:3: note: in expansion of macro 'DE'
  174 |   DE(sep[i], ul,
      |   ^~
cultivation.cpp:177:86: warning: unused variable 'dn' [-Wunused-variable]
  177 |   int ld = pops(pq2[0]), rd = max(pops(pq2[1]), max(pops(pq[0]), pops(pq[1])) - ld), dn = sep[i];
      |                                                                                      ^~
cultivation.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
cultivation.cpp:186:2: note: in expansion of macro 'DE'
  186 |  DE(ul, res);
      |  ^~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 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 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 332 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 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 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 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 332 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Incorrect 3 ms 332 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 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 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 332 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Incorrect 3 ms 332 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 460 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 460 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 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 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 332 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Incorrect 3 ms 332 KB Output isn't correct
18 Halted 0 ms 0 KB -