oj.uz

Submission #55542

# Submission time Handle Problem Language Result Execution time Memory
55542 2018-07-07T21:06:40 Z ksun48 Cultivation (JOI17_cultivation) C++14
80 / 100
 2000 ms 64644 KB 
#pragma GCC optimize("Ofast")
#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 < 500 && 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:23:6: warning: 'maxqueue::len' will be initialized after [-Wreorder]
  int len;
      ^~~
cultivation.cpp:20:14: warning:   'std::vector<int> maxqueue::elements' [-Wreorder]
  vector<int> elements;
              ^~~~~~~~
cultivation.cpp:24:2: warning:   when initialized here [-Wreorder]
  maxqueue() : s(0), len(0), elements(0), indices(0) {}
  ^~~~~~~~
cultivation.cpp: In function 'void insert(maxqueue*, int)':
cultivation.cpp:28:53: 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:125:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < xlist.size(); i++){
                 ~~^~~~~~~~~~~~~~
cultivation.cpp:129:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k = 0; k < seeds.size(); k++){
                  ~~^~~~~~~~~~~~~~
cultivation.cpp:177:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j = 0; j < 500 && j < tries.size(); j++){
                            ~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 432 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 596 KB Output is correct
7 Correct 3 ms 748 KB Output is correct
8 Correct 3 ms 748 KB Output is correct
9 Correct 2 ms 748 KB Output is correct
10 Correct 2 ms 748 KB Output is correct
11 Correct 2 ms 748 KB Output is correct
12 Correct 3 ms 748 KB Output is correct
13 Correct 2 ms 748 KB Output is correct
14 Correct 2 ms 748 KB Output is correct
15 Correct 3 ms 748 KB Output is correct
16 Correct 3 ms 748 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 432 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 596 KB Output is correct
7 Correct 3 ms 748 KB Output is correct
8 Correct 3 ms 748 KB Output is correct
9 Correct 2 ms 748 KB Output is correct
10 Correct 2 ms 748 KB Output is correct
11 Correct 2 ms 748 KB Output is correct
12 Correct 3 ms 748 KB Output is correct
13 Correct 2 ms 748 KB Output is correct
14 Correct 2 ms 748 KB Output is correct
15 Correct 3 ms 748 KB Output is correct
16 Correct 3 ms 748 KB Output is correct
17 Correct 2 ms 748 KB Output is correct
18 Correct 4 ms 764 KB Output is correct
19 Correct 2 ms 768 KB Output is correct
20 Correct 3 ms 768 KB Output is correct
21 Correct 3 ms 768 KB Output is correct
22 Correct 6 ms 768 KB Output is correct
23 Correct 2 ms 768 KB Output is correct
24 Correct 9 ms 768 KB Output is correct
25 Correct 8 ms 772 KB Output is correct
26 Correct 13 ms 892 KB Output is correct
27 Correct 15 ms 896 KB Output is correct
28 Correct 9 ms 896 KB Output is correct
29 Correct 12 ms 896 KB Output is correct
30 Correct 13 ms 896 KB Output is correct
31 Correct 14 ms 896 KB Output is correct
32 Correct 18 ms 896 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 432 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 596 KB Output is correct
7 Correct 3 ms 748 KB Output is correct
8 Correct 3 ms 748 KB Output is correct
9 Correct 2 ms 748 KB Output is correct
10 Correct 2 ms 748 KB Output is correct
11 Correct 2 ms 748 KB Output is correct
12 Correct 3 ms 748 KB Output is correct
13 Correct 2 ms 748 KB Output is correct
14 Correct 2 ms 748 KB Output is correct
15 Correct 3 ms 748 KB Output is correct
16 Correct 3 ms 748 KB Output is correct
17 Correct 2 ms 748 KB Output is correct
18 Correct 4 ms 764 KB Output is correct
19 Correct 2 ms 768 KB Output is correct
20 Correct 3 ms 768 KB Output is correct
21 Correct 3 ms 768 KB Output is correct
22 Correct 6 ms 768 KB Output is correct
23 Correct 2 ms 768 KB Output is correct
24 Correct 9 ms 768 KB Output is correct
25 Correct 8 ms 772 KB Output is correct
26 Correct 13 ms 892 KB Output is correct
27 Correct 15 ms 896 KB Output is correct
28 Correct 9 ms 896 KB Output is correct
29 Correct 12 ms 896 KB Output is correct
30 Correct 13 ms 896 KB Output is correct
31 Correct 14 ms 896 KB Output is correct
32 Correct 18 ms 896 KB Output is correct
33 Correct 5 ms 896 KB Output is correct
34 Correct 11 ms 896 KB Output is correct
35 Correct 16 ms 1020 KB Output is correct
36 Correct 14 ms 1020 KB Output is correct
37 Correct 15 ms 1020 KB Output is correct
38 Correct 15 ms 1020 KB Output is correct
39 Correct 15 ms 1020 KB Output is correct
40 Correct 17 ms 1020 KB Output is correct
41 Correct 7 ms 1020 KB Output is correct
42 Correct 12 ms 1020 KB Output is correct
43 Correct 13 ms 1020 KB Output is correct
44 Correct 16 ms 1020 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1020 KB Output is correct
2 Correct 4 ms 1020 KB Output is correct
3 Correct 4 ms 1020 KB Output is correct
4 Correct 4 ms 1020 KB Output is correct
5 Correct 4 ms 1020 KB Output is correct
6 Correct 3 ms 1020 KB Output is correct
7 Correct 2 ms 1020 KB Output is correct
8 Correct 4 ms 1020 KB Output is correct
9 Correct 4 ms 1020 KB Output is correct
10 Correct 5 ms 1024 KB Output is correct
11 Correct 4 ms 1024 KB Output is correct
12 Correct 12 ms 1024 KB Output is correct
13 Correct 3 ms 1024 KB Output is correct
14 Correct 3 ms 1024 KB Output is correct
15 Correct 3 ms 1024 KB Output is correct
16 Correct 4 ms 1024 KB Output is correct
17 Correct 3 ms 1024 KB Output is correct
18 Correct 4 ms 1024 KB Output is correct
19 Correct 4 ms 1024 KB Output is correct
20 Correct 4 ms 1024 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1020 KB Output is correct
2 Correct 4 ms 1020 KB Output is correct
3 Correct 4 ms 1020 KB Output is correct
4 Correct 4 ms 1020 KB Output is correct
5 Correct 4 ms 1020 KB Output is correct
6 Correct 3 ms 1020 KB Output is correct
7 Correct 2 ms 1020 KB Output is correct
8 Correct 4 ms 1020 KB Output is correct
9 Correct 4 ms 1020 KB Output is correct
10 Correct 5 ms 1024 KB Output is correct
11 Correct 4 ms 1024 KB Output is correct
12 Correct 12 ms 1024 KB Output is correct
13 Correct 3 ms 1024 KB Output is correct
14 Correct 3 ms 1024 KB Output is correct
15 Correct 3 ms 1024 KB Output is correct
16 Correct 4 ms 1024 KB Output is correct
17 Correct 3 ms 1024 KB Output is correct
18 Correct 4 ms 1024 KB Output is correct
19 Correct 4 ms 1024 KB Output is correct
20 Correct 4 ms 1024 KB Output is correct
21 Correct 90 ms 6588 KB Output is correct
22 Correct 99 ms 8060 KB Output is correct
23 Correct 67 ms 8060 KB Output is correct
24 Correct 61 ms 8060 KB Output is correct
25 Correct 94 ms 8060 KB Output is correct
26 Correct 27 ms 8060 KB Output is correct
27 Correct 14 ms 8060 KB Output is correct
28 Correct 106 ms 8060 KB Output is correct
29 Correct 68 ms 8060 KB Output is correct
30 Correct 93 ms 8060 KB Output is correct
31 Correct 112 ms 8780 KB Output is correct
32 Correct 100 ms 8780 KB Output is correct
33 Correct 16 ms 8780 KB Output is correct
34 Correct 97 ms 8780 KB Output is correct
35 Correct 91 ms 8780 KB Output is correct
36 Correct 48 ms 8780 KB Output is correct

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 432 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 596 KB Output is correct
7 Correct 3 ms 748 KB Output is correct
8 Correct 3 ms 748 KB Output is correct
9 Correct 2 ms 748 KB Output is correct
10 Correct 2 ms 748 KB Output is correct
11 Correct 2 ms 748 KB Output is correct
12 Correct 3 ms 748 KB Output is correct
13 Correct 2 ms 748 KB Output is correct
14 Correct 2 ms 748 KB Output is correct
15 Correct 3 ms 748 KB Output is correct
16 Correct 3 ms 748 KB Output is correct
17 Correct 2 ms 748 KB Output is correct
18 Correct 4 ms 764 KB Output is correct
19 Correct 2 ms 768 KB Output is correct
20 Correct 3 ms 768 KB Output is correct
21 Correct 3 ms 768 KB Output is correct
22 Correct 6 ms 768 KB Output is correct
23 Correct 2 ms 768 KB Output is correct
24 Correct 9 ms 768 KB Output is correct
25 Correct 8 ms 772 KB Output is correct
26 Correct 13 ms 892 KB Output is correct
27 Correct 15 ms 896 KB Output is correct
28 Correct 9 ms 896 KB Output is correct
29 Correct 12 ms 896 KB Output is correct
30 Correct 13 ms 896 KB Output is correct
31 Correct 14 ms 896 KB Output is correct
32 Correct 18 ms 896 KB Output is correct
33 Correct 5 ms 896 KB Output is correct
34 Correct 11 ms 896 KB Output is correct
35 Correct 16 ms 1020 KB Output is correct
36 Correct 14 ms 1020 KB Output is correct
37 Correct 15 ms 1020 KB Output is correct
38 Correct 15 ms 1020 KB Output is correct
39 Correct 15 ms 1020 KB Output is correct
40 Correct 17 ms 1020 KB Output is correct
41 Correct 7 ms 1020 KB Output is correct
42 Correct 12 ms 1020 KB Output is correct
43 Correct 13 ms 1020 KB Output is correct
44 Correct 16 ms 1020 KB Output is correct
45 Correct 3 ms 1020 KB Output is correct
46 Correct 4 ms 1020 KB Output is correct
47 Correct 4 ms 1020 KB Output is correct
48 Correct 4 ms 1020 KB Output is correct
49 Correct 4 ms 1020 KB Output is correct
50 Correct 3 ms 1020 KB Output is correct
51 Correct 2 ms 1020 KB Output is correct
52 Correct 4 ms 1020 KB Output is correct
53 Correct 4 ms 1020 KB Output is correct
54 Correct 5 ms 1024 KB Output is correct
55 Correct 4 ms 1024 KB Output is correct
56 Correct 12 ms 1024 KB Output is correct
57 Correct 3 ms 1024 KB Output is correct
58 Correct 3 ms 1024 KB Output is correct
59 Correct 3 ms 1024 KB Output is correct
60 Correct 4 ms 1024 KB Output is correct
61 Correct 3 ms 1024 KB Output is correct
62 Correct 4 ms 1024 KB Output is correct
63 Correct 4 ms 1024 KB Output is correct
64 Correct 4 ms 1024 KB Output is correct
65 Correct 90 ms 6588 KB Output is correct
66 Correct 99 ms 8060 KB Output is correct
67 Correct 67 ms 8060 KB Output is correct
68 Correct 61 ms 8060 KB Output is correct
69 Correct 94 ms 8060 KB Output is correct
70 Correct 27 ms 8060 KB Output is correct
71 Correct 14 ms 8060 KB Output is correct
72 Correct 106 ms 8060 KB Output is correct
73 Correct 68 ms 8060 KB Output is correct
74 Correct 93 ms 8060 KB Output is correct
75 Correct 112 ms 8780 KB Output is correct
76 Correct 100 ms 8780 KB Output is correct
77 Correct 16 ms 8780 KB Output is correct
78 Correct 97 ms 8780 KB Output is correct
79 Correct 91 ms 8780 KB Output is correct
80 Correct 48 ms 8780 KB Output is correct
81 Correct 1069 ms 44044 KB Output is correct
82 Correct 893 ms 44044 KB Output is correct
83 Correct 1147 ms 48264 KB Output is correct
84 Correct 97 ms 48264 KB Output is correct
85 Execution timed out 2056 ms 64644 KB Time limit exceeded
86 Halted 0 ms 0 KB -