oj.uz

Submission #418859

# Submission time Handle Problem Language Result Execution time Memory
418859 2021-06-06T06:13:20 Z Kevin_Zhang_TW Cultivation (JOI17_cultivation) C++17
5 / 100
 2000 ms 860 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];

		{
			int l = 0, r = R, mid;
			while (l < r) {
				mid = l + r >> 1;
				if (can_cover(ul, sep[i], ld, mid))
					r = mid;
				else
					l = mid+1;
			}
			rd = l;
		}

		chmin(res, sep[i] + ul + ld + rd);
//		assert(!can_cover(ul, sep[i], ld-1, rd+1));
//		
//		rd = pops(pq2[1]), ld = max(pops(pq2[0]), max(pops(pq[0]), pops(pq[1])) - rd);
//
//		assert(!can_cover(ul, sep[i], ld+1, rd-1));

		//rd = pops(pq2[1]);

		//assert(can_cover(ld, rd, ul, dn));
		//assert(can_cover(ul, sep[i], ld, rd));
//		assert(!can_cover(ul, sep[i], ld-1, rd));
//		assert(!can_cover(ul, sep[i], ld, rd-1));

		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:182:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  182 |     mid = l + r >> 1;
      |           ~~^~~
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:209:2: note: in expansion of macro 'DE'
  209 |  DE(ul, res);
      |  ^~

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 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 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 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 5 ms 332 KB Output is correct
18 Correct 75 ms 368 KB Output is correct
19 Correct 26 ms 332 KB Output is correct
20 Correct 8 ms 344 KB Output is correct
21 Correct 53 ms 332 KB Output is correct
22 Correct 415 ms 416 KB Output is correct
23 Correct 46 ms 340 KB Output is correct
24 Correct 1243 ms 576 KB Output is correct
25 Correct 687 ms 484 KB Output is correct
26 Execution timed out 2066 ms 860 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 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 5 ms 332 KB Output is correct
18 Correct 75 ms 368 KB Output is correct
19 Correct 26 ms 332 KB Output is correct
20 Correct 8 ms 344 KB Output is correct
21 Correct 53 ms 332 KB Output is correct
22 Correct 415 ms 416 KB Output is correct
23 Correct 46 ms 340 KB Output is correct
24 Correct 1243 ms 576 KB Output is correct
25 Correct 687 ms 484 KB Output is correct
26 Execution timed out 2066 ms 860 KB Time limit exceeded
27 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 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 5 ms 332 KB Output is correct
18 Correct 75 ms 368 KB Output is correct
19 Correct 26 ms 332 KB Output is correct
20 Correct 8 ms 344 KB Output is correct
21 Correct 53 ms 332 KB Output is correct
22 Correct 415 ms 416 KB Output is correct
23 Correct 46 ms 340 KB Output is correct
24 Correct 1243 ms 576 KB Output is correct
25 Correct 687 ms 484 KB Output is correct
26 Execution timed out 2066 ms 860 KB Time limit exceeded
27 Halted 0 ms 0 KB -