oj.uz

Submission #55512

# Submission time Handle Problem Language Result Execution time Memory
55512 2018-07-07T20:29:10 Z ksun48 Cultivation (JOI17_cultivation) C++14
80 / 100
 401 ms 38524 KB 
#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 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 idx(LL a){
	int s = 0;
	int e = xlist.size();
	while(s + 1 < e){
		int m = (s+e) / 2;
		if(a >= xlist[m]){
			s = m;
		} else {
			e = m;
		}
	}
	return s;
}

void tryxfast(int x){
	if(x < 0){
		return;
	}
	vector<int> pos1;
	vector<int> pos2;
	for(int a : xlist){
		pos1.push_back(a - x);
		pos2.push_back(a + 1);
	}
	vector<int> pos(pos1.size() + pos2.size());
	merge(pos1.begin(), pos1.end(), pos2.begin(), pos2.end(), pos.begin());

	vector<int> ups;
	vector<int> downs;
	vector<int> totals;

	for(int i = 0; i < pos.size(); i++){
		int a = idx((LL)pos[i]+x);
		int b = idx((LL)pos[i]-1);
		// a >= b
		ups.push_back(up[a][b]);
		downs.push_back(down[a][b]);
		totals.push_back(total[a][b]);
	}


	// two pointers: 
	int j = 0;
	maxqueue* upset    = new maxqueue();
	maxqueue* downset  = new maxqueue();
	maxqueue* totalset = new maxqueue();
	for(int i = 0; i < pos.size(); i++){
		while(j < pos.size() && 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);
			best = (int)min((LL)best, need + x);
		}
		pop(upset, i);
		pop(downset, i);
		pop(totalset, i);
	}
}

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);
	}

	// 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()));
		}
	}

	if(n > 100 & r > 40) return 0;
	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);
		}
	}
	for(int r : trying){
		tryxfast(r);
	}
	cout << best << '\n';
}

Compilation message

cultivation.cpp: In constructor 'maxqueue::maxqueue()':
cultivation.cpp:21:6: warning: 'maxqueue::len' will be initialized after [-Wreorder]
  int len;
      ^~~
cultivation.cpp:18:14: warning:   'std::vector<int> maxqueue::elements' [-Wreorder]
  vector<int> elements;
              ^~~~~~~~
cultivation.cpp:22:2: warning:   when initialized here [-Wreorder]
  maxqueue() : s(0), len(0), elements(0), indices(0) {}
  ^~~~~~~~
cultivation.cpp: In function 'void insert(maxqueue*, int)':
cultivation.cpp:26:53: 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 'void tryxfast(int)':
cultivation.cpp:74:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < pos.size(); i++){
                 ~~^~~~~~~~~~~~
cultivation.cpp:89:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < pos.size(); i++){
                 ~~^~~~~~~~~~~~
cultivation.cpp:90:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(j < pos.size() && pos[j] <= pos[i] + r - 1){
         ~~^~~~~~~~~~~~
cultivation.cpp: In function 'int main()':
cultivation.cpp:128:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < xlist.size(); i++){
                 ~~^~~~~~~~~~~~~~
cultivation.cpp:132:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k = 0; k < seeds.size(); k++){
                  ~~^~~~~~~~~~~~~~
cultivation.cpp:169:7: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(n > 100 & r > 40) return 0;
     ~~^~~~~

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 484 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 2 ms 608 KB Output is correct
5 Correct 2 ms 608 KB Output is correct
6 Correct 2 ms 608 KB Output is correct
7 Correct 2 ms 616 KB Output is correct
8 Correct 2 ms 616 KB Output is correct
9 Correct 2 ms 616 KB Output is correct
10 Correct 2 ms 616 KB Output is correct
11 Correct 2 ms 616 KB Output is correct
12 Correct 2 ms 616 KB Output is correct
13 Correct 2 ms 616 KB Output is correct
14 Correct 2 ms 616 KB Output is correct
15 Correct 3 ms 616 KB Output is correct
16 Correct 2 ms 616 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 484 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 2 ms 608 KB Output is correct
5 Correct 2 ms 608 KB Output is correct
6 Correct 2 ms 608 KB Output is correct
7 Correct 2 ms 616 KB Output is correct
8 Correct 2 ms 616 KB Output is correct
9 Correct 2 ms 616 KB Output is correct
10 Correct 2 ms 616 KB Output is correct
11 Correct 2 ms 616 KB Output is correct
12 Correct 2 ms 616 KB Output is correct
13 Correct 2 ms 616 KB Output is correct
14 Correct 2 ms 616 KB Output is correct
15 Correct 3 ms 616 KB Output is correct
16 Correct 2 ms 616 KB Output is correct
17 Correct 2 ms 616 KB Output is correct
18 Correct 4 ms 696 KB Output is correct
19 Correct 4 ms 696 KB Output is correct
20 Correct 3 ms 696 KB Output is correct
21 Correct 4 ms 732 KB Output is correct
22 Correct 7 ms 740 KB Output is correct
23 Correct 3 ms 740 KB Output is correct
24 Correct 10 ms 824 KB Output is correct
25 Correct 9 ms 824 KB Output is correct
26 Correct 16 ms 868 KB Output is correct
27 Correct 16 ms 868 KB Output is correct
28 Correct 11 ms 868 KB Output is correct
29 Correct 15 ms 868 KB Output is correct
30 Correct 15 ms 1004 KB Output is correct
31 Correct 16 ms 1004 KB Output is correct
32 Correct 17 ms 1004 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 484 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 2 ms 608 KB Output is correct
5 Correct 2 ms 608 KB Output is correct
6 Correct 2 ms 608 KB Output is correct
7 Correct 2 ms 616 KB Output is correct
8 Correct 2 ms 616 KB Output is correct
9 Correct 2 ms 616 KB Output is correct
10 Correct 2 ms 616 KB Output is correct
11 Correct 2 ms 616 KB Output is correct
12 Correct 2 ms 616 KB Output is correct
13 Correct 2 ms 616 KB Output is correct
14 Correct 2 ms 616 KB Output is correct
15 Correct 3 ms 616 KB Output is correct
16 Correct 2 ms 616 KB Output is correct
17 Correct 2 ms 616 KB Output is correct
18 Correct 4 ms 696 KB Output is correct
19 Correct 4 ms 696 KB Output is correct
20 Correct 3 ms 696 KB Output is correct
21 Correct 4 ms 732 KB Output is correct
22 Correct 7 ms 740 KB Output is correct
23 Correct 3 ms 740 KB Output is correct
24 Correct 10 ms 824 KB Output is correct
25 Correct 9 ms 824 KB Output is correct
26 Correct 16 ms 868 KB Output is correct
27 Correct 16 ms 868 KB Output is correct
28 Correct 11 ms 868 KB Output is correct
29 Correct 15 ms 868 KB Output is correct
30 Correct 15 ms 1004 KB Output is correct
31 Correct 16 ms 1004 KB Output is correct
32 Correct 17 ms 1004 KB Output is correct
33 Correct 5 ms 1004 KB Output is correct
34 Correct 12 ms 1004 KB Output is correct
35 Correct 16 ms 1004 KB Output is correct
36 Correct 16 ms 1004 KB Output is correct
37 Correct 16 ms 1004 KB Output is correct
38 Correct 17 ms 1004 KB Output is correct
39 Correct 16 ms 1004 KB Output is correct
40 Correct 17 ms 1004 KB Output is correct
41 Correct 9 ms 1004 KB Output is correct
42 Correct 13 ms 1004 KB Output is correct
43 Correct 14 ms 1004 KB Output is correct
44 Correct 16 ms 1004 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1004 KB Output is correct
2 Correct 8 ms 1148 KB Output is correct
3 Correct 10 ms 1148 KB Output is correct
4 Correct 9 ms 1532 KB Output is correct
5 Correct 10 ms 1532 KB Output is correct
6 Correct 5 ms 1532 KB Output is correct
7 Correct 3 ms 1532 KB Output is correct
8 Correct 8 ms 1532 KB Output is correct
9 Correct 6 ms 1532 KB Output is correct
10 Correct 9 ms 1532 KB Output is correct
11 Correct 14 ms 1532 KB Output is correct
12 Correct 8 ms 1532 KB Output is correct
13 Correct 4 ms 1532 KB Output is correct
14 Correct 5 ms 1532 KB Output is correct
15 Correct 4 ms 1532 KB Output is correct
16 Correct 11 ms 1532 KB Output is correct
17 Correct 9 ms 1532 KB Output is correct
18 Correct 6 ms 1532 KB Output is correct
19 Correct 9 ms 1532 KB Output is correct
20 Correct 8 ms 1532 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1004 KB Output is correct
2 Correct 8 ms 1148 KB Output is correct
3 Correct 10 ms 1148 KB Output is correct
4 Correct 9 ms 1532 KB Output is correct
5 Correct 10 ms 1532 KB Output is correct
6 Correct 5 ms 1532 KB Output is correct
7 Correct 3 ms 1532 KB Output is correct
8 Correct 8 ms 1532 KB Output is correct
9 Correct 6 ms 1532 KB Output is correct
10 Correct 9 ms 1532 KB Output is correct
11 Correct 14 ms 1532 KB Output is correct
12 Correct 8 ms 1532 KB Output is correct
13 Correct 4 ms 1532 KB Output is correct
14 Correct 5 ms 1532 KB Output is correct
15 Correct 4 ms 1532 KB Output is correct
16 Correct 11 ms 1532 KB Output is correct
17 Correct 9 ms 1532 KB Output is correct
18 Correct 6 ms 1532 KB Output is correct
19 Correct 9 ms 1532 KB Output is correct
20 Correct 8 ms 1532 KB Output is correct
21 Correct 194 ms 7164 KB Output is correct
22 Correct 347 ms 9908 KB Output is correct
23 Correct 363 ms 10164 KB Output is correct
24 Correct 334 ms 10612 KB Output is correct
25 Correct 333 ms 10612 KB Output is correct
26 Correct 111 ms 10612 KB Output is correct
27 Correct 397 ms 34752 KB Output is correct
28 Correct 387 ms 34752 KB Output is correct
29 Correct 356 ms 34752 KB Output is correct
30 Correct 398 ms 34752 KB Output is correct
31 Correct 401 ms 34752 KB Output is correct
32 Correct 332 ms 34752 KB Output is correct
33 Correct 393 ms 38524 KB Output is correct
34 Correct 374 ms 38524 KB Output is correct
35 Correct 387 ms 38524 KB Output is correct
36 Correct 381 ms 38524 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 484 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 2 ms 608 KB Output is correct
5 Correct 2 ms 608 KB Output is correct
6 Correct 2 ms 608 KB Output is correct
7 Correct 2 ms 616 KB Output is correct
8 Correct 2 ms 616 KB Output is correct
9 Correct 2 ms 616 KB Output is correct
10 Correct 2 ms 616 KB Output is correct
11 Correct 2 ms 616 KB Output is correct
12 Correct 2 ms 616 KB Output is correct
13 Correct 2 ms 616 KB Output is correct
14 Correct 2 ms 616 KB Output is correct
15 Correct 3 ms 616 KB Output is correct
16 Correct 2 ms 616 KB Output is correct
17 Correct 2 ms 616 KB Output is correct
18 Correct 4 ms 696 KB Output is correct
19 Correct 4 ms 696 KB Output is correct
20 Correct 3 ms 696 KB Output is correct
21 Correct 4 ms 732 KB Output is correct
22 Correct 7 ms 740 KB Output is correct
23 Correct 3 ms 740 KB Output is correct
24 Correct 10 ms 824 KB Output is correct
25 Correct 9 ms 824 KB Output is correct
26 Correct 16 ms 868 KB Output is correct
27 Correct 16 ms 868 KB Output is correct
28 Correct 11 ms 868 KB Output is correct
29 Correct 15 ms 868 KB Output is correct
30 Correct 15 ms 1004 KB Output is correct
31 Correct 16 ms 1004 KB Output is correct
32 Correct 17 ms 1004 KB Output is correct
33 Correct 5 ms 1004 KB Output is correct
34 Correct 12 ms 1004 KB Output is correct
35 Correct 16 ms 1004 KB Output is correct
36 Correct 16 ms 1004 KB Output is correct
37 Correct 16 ms 1004 KB Output is correct
38 Correct 17 ms 1004 KB Output is correct
39 Correct 16 ms 1004 KB Output is correct
40 Correct 17 ms 1004 KB Output is correct
41 Correct 9 ms 1004 KB Output is correct
42 Correct 13 ms 1004 KB Output is correct
43 Correct 14 ms 1004 KB Output is correct
44 Correct 16 ms 1004 KB Output is correct
45 Correct 5 ms 1004 KB Output is correct
46 Correct 8 ms 1148 KB Output is correct
47 Correct 10 ms 1148 KB Output is correct
48 Correct 9 ms 1532 KB Output is correct
49 Correct 10 ms 1532 KB Output is correct
50 Correct 5 ms 1532 KB Output is correct
51 Correct 3 ms 1532 KB Output is correct
52 Correct 8 ms 1532 KB Output is correct
53 Correct 6 ms 1532 KB Output is correct
54 Correct 9 ms 1532 KB Output is correct
55 Correct 14 ms 1532 KB Output is correct
56 Correct 8 ms 1532 KB Output is correct
57 Correct 4 ms 1532 KB Output is correct
58 Correct 5 ms 1532 KB Output is correct
59 Correct 4 ms 1532 KB Output is correct
60 Correct 11 ms 1532 KB Output is correct
61 Correct 9 ms 1532 KB Output is correct
62 Correct 6 ms 1532 KB Output is correct
63 Correct 9 ms 1532 KB Output is correct
64 Correct 8 ms 1532 KB Output is correct
65 Correct 194 ms 7164 KB Output is correct
66 Correct 347 ms 9908 KB Output is correct
67 Correct 363 ms 10164 KB Output is correct
68 Correct 334 ms 10612 KB Output is correct
69 Correct 333 ms 10612 KB Output is correct
70 Correct 111 ms 10612 KB Output is correct
71 Correct 397 ms 34752 KB Output is correct
72 Correct 387 ms 34752 KB Output is correct
73 Correct 356 ms 34752 KB Output is correct
74 Correct 398 ms 34752 KB Output is correct
75 Correct 401 ms 34752 KB Output is correct
76 Correct 332 ms 34752 KB Output is correct
77 Correct 393 ms 38524 KB Output is correct
78 Correct 374 ms 38524 KB Output is correct
79 Correct 387 ms 38524 KB Output is correct
80 Correct 381 ms 38524 KB Output is correct
81 Incorrect 67 ms 38524 KB Output isn't correct
82 Halted 0 ms 0 KB -