답안 #55538 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
55538	2018-07-07T21:02:44 Z	ksun48	Cultivation (JOI17_cultivation)	C++14	80 / 100	2000 ms	57108 KB

cultivation

#include <bits/stdc++.h>
using namespace std;
typedef long long LL;

int r, c, n;
vector<pair<int,int> > seeds;
const int INF = 2100100100;
int best = INF;
set<int> tried;

vector<int> xlist;
int len;

int up[400][400];
int down[400][400];
int total[400][400];

struct maxqueue {
	vector<int> elements;
	vector<int> indices;
	int s;
	int len;
	maxqueue() : s(0), len(0), elements(0), indices(0) {}
};

void insert(maxqueue* m, int f){
	while(m->elements.size() > 0 && m->elements.size() > m->s && m->elements[m->elements.size()-1] <= f){
		m->elements.pop_back();
		m->indices.pop_back();
	}
	m->elements.push_back(f);
	m->indices.push_back(m->len);
	m->len++;
}
int get(maxqueue* m){
	return m->elements[m->s];
}
void pop(maxqueue *m, int idx){
	if(m->indices[m->s] == idx){
		m->s++;
	}
}

int ups[700];
int downs[700];
int totals[700];
int pos1[700];
int pos2[700];
int pos[700];

LL lastc = 0;

void tryxfast(int x){
	if(x < 0 || (x+1) <= (r-1)/n || (LL)x + lastc >= (LL)best){
		return;
	}
	for(int i = 0; i < len; i++){
		pos1[i] = xlist[i] - x;
		pos2[i] = xlist[i] + 1;
	}
	merge(pos1, pos1 + len, pos2, pos2 + len, pos);

	int sz = len * 2;

	int a = 0;
	int b = 0;
	for(int i = 0; i < sz; i++){
		while(a + 1 < len && xlist[a+1] - x <= pos[i]) a++;
		while(b + 1 < len && xlist[b+1] + 1 <= pos[i]) b++;
		// a >= b
		ups[i] = up[a][b];
		downs[i] = down[a][b];
		totals[i] = total[a][b];
	}

	// two pointers: 
	int j = 0;
	maxqueue* upset    = new maxqueue();
	maxqueue* downset  = new maxqueue();
	maxqueue* totalset = new maxqueue();
	LL bestneed = best + 1;
	for(int i = 0; i < sz; i++){
		while(j < sz && pos[j] <= pos[i] + r - 1){
			insert(upset, ups[j]);
			insert(downset, downs[j]);
			insert(totalset, totals[j]);
			j++;
		}
		int total = get(totalset);
		if(total < c+1){
			LL need = max((LL)get(upset) + (LL)get(downset), (LL)total - 1);
			bestneed = min(bestneed, need);
		}
		pop(upset, i);
		pop(downset, i);
		pop(totalset, i);
	}
	lastc = bestneed;
	best = min((LL)best, bestneed + (LL)x);
}

int main(){
	cin.sync_with_stdio(0); cin.tie(0);
	cin >> r >> c >> n;
	for(int i = 0; i < n; i++){
		int s, e;
		cin >> s >> e;
		s--; e--;
		seeds.push_back({e,s});
	}
	sort(seeds.begin(), seeds.end());
	set<int> xset;
	for(int i = 0; i < n; i++){
		swap(seeds[i].first, seeds[i].second);
		xset.insert(seeds[i].first);
	}
	xlist.push_back(-1);
	for(int x : xset){
		xlist.push_back(x);
	}
	len = xlist.size();

	// now n^2 log n
	for(int i = 0; i < xlist.size(); i++){
		vector<int> ins[xlist.size() + 1];
		vector<int> del[xlist.size() + 1];

		for(int k = 0; k < seeds.size(); k++){
			int p = seeds[k].first;
			if(p <= xlist[i]){
				ins[0].push_back(seeds[k].second);
				int jdel = lower_bound(xlist.begin(), xlist.end(), p) - xlist.begin();
				del[jdel].push_back(seeds[k].second);
			}
		}

		multiset<int> grass;
		grass.insert(-1);
		grass.insert(c);
		multiset<int> diffs;
		diffs.insert(-(c+1));
		for(int j = 0; j <= i; j++){
			for(int a : del[j]){
				int a1 = *(--grass.find(a));
				int a2 = *(++grass.find(a));
				diffs.erase(diffs.find(a1-a));
				diffs.erase(diffs.find(a-a2));
				diffs.insert(a1-a2);
				grass.erase(grass.find(a));
			}
			for(int a : ins[j]){
				grass.insert(a);
				int a1 = *(--grass.find(a));
				int a2 = *(++grass.find(a));
				diffs.erase(diffs.find(a1-a2));
				diffs.insert(a1-a);
				diffs.insert(a-a2);
			}
			total[i][j] = -*diffs.begin();
			up[i][j] = *(++grass.begin()) - 0;
			down[i][j] = c-1 - *(--(--grass.end()));
		}
	}

	set<int> trying;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			trying.insert(-(seeds[i].first + r-1 - seeds[j].first));
			trying.insert(-(seeds[i].first -   1 - seeds[j].first));
		}
	}
	vector<int> tries;
	for(int r : trying){
		tries.push_back(-r);
	}
	for(int j = 0; j < 1000 && j < tries.size(); j++){
		lastc = 0;
		tryxfast(tries[tries.size()-1-j]);
	}
	lastc = 0;
	for(int r : tries){
		tryxfast(r);
	}
	cout << best << '\n';
}

Compilation message

cultivation.cpp: In constructor 'maxqueue::maxqueue()':
cultivation.cpp:22:6: warning: 'maxqueue::len' will be initialized after [-Wreorder]
  int len;
      ^~~
cultivation.cpp:19:14: warning:   'std::vector<int> maxqueue::elements' [-Wreorder]
  vector<int> elements;
              ^~~~~~~~
cultivation.cpp:23:2: warning:   when initialized here [-Wreorder]
  maxqueue() : s(0), len(0), elements(0), indices(0) {}
  ^~~~~~~~
cultivation.cpp: In function 'void insert(maxqueue*, int)':
cultivation.cpp:27:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(m->elements.size() > 0 && m->elements.size() > m->s && m->elements[m->elements.size()-1] <= f){
                                  ~~~~~~~~~~~~~~~~~~~^~~~~~
cultivation.cpp: In function 'int main()':
cultivation.cpp:124:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < xlist.size(); i++){
                 ~~^~~~~~~~~~~~~~
cultivation.cpp:128:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k = 0; k < seeds.size(); k++){
                  ~~^~~~~~~~~~~~~~
cultivation.cpp:176:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j = 0; j < 1000 && j < tries.size(); j++){
                             ~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	484 KB	Output is correct
3	Correct	2 ms	576 KB	Output is correct
4	Correct	3 ms	576 KB	Output is correct
5	Correct	2 ms	576 KB	Output is correct
6	Correct	3 ms	576 KB	Output is correct
7	Correct	2 ms	576 KB	Output is correct
8	Correct	2 ms	576 KB	Output is correct
9	Correct	2 ms	576 KB	Output is correct
10	Correct	2 ms	576 KB	Output is correct
11	Correct	3 ms	576 KB	Output is correct
12	Correct	2 ms	576 KB	Output is correct
13	Correct	3 ms	576 KB	Output is correct
14	Correct	3 ms	576 KB	Output is correct
15	Correct	2 ms	576 KB	Output is correct
16	Correct	2 ms	576 KB	Output is correct

Subtask #2
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	484 KB	Output is correct
3	Correct	2 ms	576 KB	Output is correct
4	Correct	3 ms	576 KB	Output is correct
5	Correct	2 ms	576 KB	Output is correct
6	Correct	3 ms	576 KB	Output is correct
7	Correct	2 ms	576 KB	Output is correct
8	Correct	2 ms	576 KB	Output is correct
9	Correct	2 ms	576 KB	Output is correct
10	Correct	2 ms	576 KB	Output is correct
11	Correct	3 ms	576 KB	Output is correct
12	Correct	2 ms	576 KB	Output is correct
13	Correct	3 ms	576 KB	Output is correct
14	Correct	3 ms	576 KB	Output is correct
15	Correct	2 ms	576 KB	Output is correct
16	Correct	2 ms	576 KB	Output is correct
17	Correct	3 ms	576 KB	Output is correct
18	Correct	4 ms	676 KB	Output is correct
19	Correct	3 ms	808 KB	Output is correct
20	Correct	2 ms	808 KB	Output is correct
21	Correct	5 ms	808 KB	Output is correct
22	Correct	6 ms	808 KB	Output is correct
23	Correct	3 ms	808 KB	Output is correct
24	Correct	10 ms	808 KB	Output is correct
25	Correct	7 ms	836 KB	Output is correct
26	Correct	17 ms	860 KB	Output is correct
27	Correct	16 ms	868 KB	Output is correct
28	Correct	10 ms	868 KB	Output is correct
29	Correct	16 ms	868 KB	Output is correct
30	Correct	14 ms	868 KB	Output is correct
31	Correct	16 ms	868 KB	Output is correct
32	Correct	17 ms	868 KB	Output is correct

Subtask #3
15.0 / 15.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	484 KB	Output is correct
3	Correct	2 ms	576 KB	Output is correct
4	Correct	3 ms	576 KB	Output is correct
5	Correct	2 ms	576 KB	Output is correct
6	Correct	3 ms	576 KB	Output is correct
7	Correct	2 ms	576 KB	Output is correct
8	Correct	2 ms	576 KB	Output is correct
9	Correct	2 ms	576 KB	Output is correct
10	Correct	2 ms	576 KB	Output is correct
11	Correct	3 ms	576 KB	Output is correct
12	Correct	2 ms	576 KB	Output is correct
13	Correct	3 ms	576 KB	Output is correct
14	Correct	3 ms	576 KB	Output is correct
15	Correct	2 ms	576 KB	Output is correct
16	Correct	2 ms	576 KB	Output is correct
17	Correct	3 ms	576 KB	Output is correct
18	Correct	4 ms	676 KB	Output is correct
19	Correct	3 ms	808 KB	Output is correct
20	Correct	2 ms	808 KB	Output is correct
21	Correct	5 ms	808 KB	Output is correct
22	Correct	6 ms	808 KB	Output is correct
23	Correct	3 ms	808 KB	Output is correct
24	Correct	10 ms	808 KB	Output is correct
25	Correct	7 ms	836 KB	Output is correct
26	Correct	17 ms	860 KB	Output is correct
27	Correct	16 ms	868 KB	Output is correct
28	Correct	10 ms	868 KB	Output is correct
29	Correct	16 ms	868 KB	Output is correct
30	Correct	14 ms	868 KB	Output is correct
31	Correct	16 ms	868 KB	Output is correct
32	Correct	17 ms	868 KB	Output is correct
33	Correct	7 ms	868 KB	Output is correct
34	Correct	10 ms	868 KB	Output is correct
35	Correct	14 ms	868 KB	Output is correct
36	Correct	15 ms	868 KB	Output is correct
37	Correct	15 ms	868 KB	Output is correct
38	Correct	16 ms	868 KB	Output is correct
39	Correct	17 ms	868 KB	Output is correct
40	Correct	19 ms	868 KB	Output is correct
41	Correct	10 ms	868 KB	Output is correct
42	Correct	11 ms	872 KB	Output is correct
43	Correct	14 ms	872 KB	Output is correct
44	Correct	18 ms	872 KB	Output is correct

Subtask #4
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	872 KB	Output is correct
2	Correct	5 ms	996 KB	Output is correct
3	Correct	4 ms	996 KB	Output is correct
4	Correct	6 ms	1380 KB	Output is correct
5	Correct	7 ms	1380 KB	Output is correct
6	Correct	4 ms	1380 KB	Output is correct
7	Correct	2 ms	1380 KB	Output is correct
8	Correct	4 ms	1380 KB	Output is correct
9	Correct	5 ms	1380 KB	Output is correct
10	Correct	7 ms	1380 KB	Output is correct
11	Correct	5 ms	1380 KB	Output is correct
12	Correct	5 ms	1380 KB	Output is correct
13	Correct	3 ms	1380 KB	Output is correct
14	Correct	4 ms	1380 KB	Output is correct
15	Correct	4 ms	1380 KB	Output is correct
16	Correct	6 ms	1380 KB	Output is correct
17	Correct	4 ms	1380 KB	Output is correct
18	Correct	5 ms	1380 KB	Output is correct
19	Correct	5 ms	1380 KB	Output is correct
20	Correct	6 ms	1392 KB	Output is correct

Subtask #5
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	872 KB	Output is correct
2	Correct	5 ms	996 KB	Output is correct
3	Correct	4 ms	996 KB	Output is correct
4	Correct	6 ms	1380 KB	Output is correct
5	Correct	7 ms	1380 KB	Output is correct
6	Correct	4 ms	1380 KB	Output is correct
7	Correct	2 ms	1380 KB	Output is correct
8	Correct	4 ms	1380 KB	Output is correct
9	Correct	5 ms	1380 KB	Output is correct
10	Correct	7 ms	1380 KB	Output is correct
11	Correct	5 ms	1380 KB	Output is correct
12	Correct	5 ms	1380 KB	Output is correct
13	Correct	3 ms	1380 KB	Output is correct
14	Correct	4 ms	1380 KB	Output is correct
15	Correct	4 ms	1380 KB	Output is correct
16	Correct	6 ms	1380 KB	Output is correct
17	Correct	4 ms	1380 KB	Output is correct
18	Correct	5 ms	1380 KB	Output is correct
19	Correct	5 ms	1380 KB	Output is correct
20	Correct	6 ms	1392 KB	Output is correct
21	Correct	90 ms	6712 KB	Output is correct
22	Correct	133 ms	8096 KB	Output is correct
23	Correct	83 ms	8096 KB	Output is correct
24	Correct	75 ms	8096 KB	Output is correct
25	Correct	131 ms	8096 KB	Output is correct
26	Correct	38 ms	8096 KB	Output is correct
27	Correct	16 ms	8096 KB	Output is correct
28	Correct	114 ms	8096 KB	Output is correct
29	Correct	90 ms	8096 KB	Output is correct
30	Correct	100 ms	8096 KB	Output is correct
31	Correct	117 ms	8768 KB	Output is correct
32	Correct	101 ms	8768 KB	Output is correct
33	Correct	11 ms	8768 KB	Output is correct
34	Correct	100 ms	8768 KB	Output is correct
35	Correct	86 ms	8768 KB	Output is correct
36	Correct	47 ms	8768 KB	Output is correct

Subtask #6
0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	484 KB	Output is correct
3	Correct	2 ms	576 KB	Output is correct
4	Correct	3 ms	576 KB	Output is correct
5	Correct	2 ms	576 KB	Output is correct
6	Correct	3 ms	576 KB	Output is correct
7	Correct	2 ms	576 KB	Output is correct
8	Correct	2 ms	576 KB	Output is correct
9	Correct	2 ms	576 KB	Output is correct
10	Correct	2 ms	576 KB	Output is correct
11	Correct	3 ms	576 KB	Output is correct
12	Correct	2 ms	576 KB	Output is correct
13	Correct	3 ms	576 KB	Output is correct
14	Correct	3 ms	576 KB	Output is correct
15	Correct	2 ms	576 KB	Output is correct
16	Correct	2 ms	576 KB	Output is correct
17	Correct	3 ms	576 KB	Output is correct
18	Correct	4 ms	676 KB	Output is correct
19	Correct	3 ms	808 KB	Output is correct
20	Correct	2 ms	808 KB	Output is correct
21	Correct	5 ms	808 KB	Output is correct
22	Correct	6 ms	808 KB	Output is correct
23	Correct	3 ms	808 KB	Output is correct
24	Correct	10 ms	808 KB	Output is correct
25	Correct	7 ms	836 KB	Output is correct
26	Correct	17 ms	860 KB	Output is correct
27	Correct	16 ms	868 KB	Output is correct
28	Correct	10 ms	868 KB	Output is correct
29	Correct	16 ms	868 KB	Output is correct
30	Correct	14 ms	868 KB	Output is correct
31	Correct	16 ms	868 KB	Output is correct
32	Correct	17 ms	868 KB	Output is correct
33	Correct	7 ms	868 KB	Output is correct
34	Correct	10 ms	868 KB	Output is correct
35	Correct	14 ms	868 KB	Output is correct
36	Correct	15 ms	868 KB	Output is correct
37	Correct	15 ms	868 KB	Output is correct
38	Correct	16 ms	868 KB	Output is correct
39	Correct	17 ms	868 KB	Output is correct
40	Correct	19 ms	868 KB	Output is correct
41	Correct	10 ms	868 KB	Output is correct
42	Correct	11 ms	872 KB	Output is correct
43	Correct	14 ms	872 KB	Output is correct
44	Correct	18 ms	872 KB	Output is correct
45	Correct	4 ms	872 KB	Output is correct
46	Correct	5 ms	996 KB	Output is correct
47	Correct	4 ms	996 KB	Output is correct
48	Correct	6 ms	1380 KB	Output is correct
49	Correct	7 ms	1380 KB	Output is correct
50	Correct	4 ms	1380 KB	Output is correct
51	Correct	2 ms	1380 KB	Output is correct
52	Correct	4 ms	1380 KB	Output is correct
53	Correct	5 ms	1380 KB	Output is correct
54	Correct	7 ms	1380 KB	Output is correct
55	Correct	5 ms	1380 KB	Output is correct
56	Correct	5 ms	1380 KB	Output is correct
57	Correct	3 ms	1380 KB	Output is correct
58	Correct	4 ms	1380 KB	Output is correct
59	Correct	4 ms	1380 KB	Output is correct
60	Correct	6 ms	1380 KB	Output is correct
61	Correct	4 ms	1380 KB	Output is correct
62	Correct	5 ms	1380 KB	Output is correct
63	Correct	5 ms	1380 KB	Output is correct
64	Correct	6 ms	1392 KB	Output is correct
65	Correct	90 ms	6712 KB	Output is correct
66	Correct	133 ms	8096 KB	Output is correct
67	Correct	83 ms	8096 KB	Output is correct
68	Correct	75 ms	8096 KB	Output is correct
69	Correct	131 ms	8096 KB	Output is correct
70	Correct	38 ms	8096 KB	Output is correct
71	Correct	16 ms	8096 KB	Output is correct
72	Correct	114 ms	8096 KB	Output is correct
73	Correct	90 ms	8096 KB	Output is correct
74	Correct	100 ms	8096 KB	Output is correct
75	Correct	117 ms	8768 KB	Output is correct
76	Correct	101 ms	8768 KB	Output is correct
77	Correct	11 ms	8768 KB	Output is correct
78	Correct	100 ms	8768 KB	Output is correct
79	Correct	86 ms	8768 KB	Output is correct
80	Correct	47 ms	8768 KB	Output is correct
81	Correct	1220 ms	44112 KB	Output is correct
82	Correct	1248 ms	44112 KB	Output is correct
83	Correct	1523 ms	48204 KB	Output is correct
84	Correct	118 ms	48204 KB	Output is correct
85	Execution timed out	2065 ms	57108 KB	Time limit exceeded
86	Halted	0 ms	0 KB	-

답안 #55538

Compilation message

Subtask #1 5.0 / 5.0

Subtask #2 10.0 / 10.0

Subtask #3 15.0 / 15.0

Subtask #4 30.0 / 30.0

Subtask #5 20.0 / 20.0

Subtask #6 0 / 20.0

Subtask #1
5.0 / 5.0

Subtask #2
10.0 / 10.0

Subtask #3
15.0 / 15.0

Subtask #4
30.0 / 30.0

Subtask #5
20.0 / 20.0

Subtask #6
0 / 20.0