oj.uz

Submission #55616

# Submission time Handle Problem Language Result Execution time Memory
55616 2018-07-08T08:11:11 Z ksun48 Cultivation (JOI17_cultivation) C++14
80 / 100
 1983 ms 63136 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 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];

int lastc = 0;

void tryxfast(int x){
	if(x < 0 || (x+1) <= (r-1)/n || (LL)x >= (LL)best - (LL)lastc){
		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++;
		}
		if(j == sz) break;
		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(){
	double st = clock();
	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 = 20000; j < 30000 && j < tries.size(); j++){
		lastc = 0;
		tryxfast(tries[tries.size()-1-j]);
	}
	lastc = 0;
	for(int r : tries){
		if(clock() > st + 1.95 * CLOCKS_PER_SEC) break;
		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:126:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < xlist.size(); i++){
                 ~~^~~~~~~~~~~~~~
cultivation.cpp:130:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k = 0; k < seeds.size(); k++){
                  ~~^~~~~~~~~~~~~~
cultivation.cpp:178:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j = 20000; j < 30000 && 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 3 ms 376 KB Output is correct
3 Correct 2 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 2 ms 568 KB Output is correct
6 Correct 2 ms 568 KB Output is correct
7 Correct 2 ms 568 KB Output is correct
8 Correct 3 ms 760 KB Output is correct
9 Correct 3 ms 760 KB Output is correct
10 Correct 3 ms 760 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 2 ms 760 KB Output is correct
13 Correct 2 ms 760 KB Output is correct
14 Correct 2 ms 760 KB Output is correct
15 Correct 2 ms 760 KB Output is correct
16 Correct 2 ms 760 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 3 ms 376 KB Output is correct
3 Correct 2 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 2 ms 568 KB Output is correct
6 Correct 2 ms 568 KB Output is correct
7 Correct 2 ms 568 KB Output is correct
8 Correct 3 ms 760 KB Output is correct
9 Correct 3 ms 760 KB Output is correct
10 Correct 3 ms 760 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 2 ms 760 KB Output is correct
13 Correct 2 ms 760 KB Output is correct
14 Correct 2 ms 760 KB Output is correct
15 Correct 2 ms 760 KB Output is correct
16 Correct 2 ms 760 KB Output is correct
17 Correct 2 ms 760 KB Output is correct
18 Correct 3 ms 760 KB Output is correct
19 Correct 3 ms 760 KB Output is correct
20 Correct 2 ms 760 KB Output is correct
21 Correct 4 ms 764 KB Output is correct
22 Correct 6 ms 892 KB Output is correct
23 Correct 3 ms 892 KB Output is correct
24 Correct 11 ms 892 KB Output is correct
25 Correct 8 ms 892 KB Output is correct
26 Correct 15 ms 892 KB Output is correct
27 Correct 16 ms 892 KB Output is correct
28 Correct 12 ms 892 KB Output is correct
29 Correct 19 ms 892 KB Output is correct
30 Correct 15 ms 1012 KB Output is correct
31 Correct 17 ms 1012 KB Output is correct
32 Correct 17 ms 1012 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 3 ms 376 KB Output is correct
3 Correct 2 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 2 ms 568 KB Output is correct
6 Correct 2 ms 568 KB Output is correct
7 Correct 2 ms 568 KB Output is correct
8 Correct 3 ms 760 KB Output is correct
9 Correct 3 ms 760 KB Output is correct
10 Correct 3 ms 760 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 2 ms 760 KB Output is correct
13 Correct 2 ms 760 KB Output is correct
14 Correct 2 ms 760 KB Output is correct
15 Correct 2 ms 760 KB Output is correct
16 Correct 2 ms 760 KB Output is correct
17 Correct 2 ms 760 KB Output is correct
18 Correct 3 ms 760 KB Output is correct
19 Correct 3 ms 760 KB Output is correct
20 Correct 2 ms 760 KB Output is correct
21 Correct 4 ms 764 KB Output is correct
22 Correct 6 ms 892 KB Output is correct
23 Correct 3 ms 892 KB Output is correct
24 Correct 11 ms 892 KB Output is correct
25 Correct 8 ms 892 KB Output is correct
26 Correct 15 ms 892 KB Output is correct
27 Correct 16 ms 892 KB Output is correct
28 Correct 12 ms 892 KB Output is correct
29 Correct 19 ms 892 KB Output is correct
30 Correct 15 ms 1012 KB Output is correct
31 Correct 17 ms 1012 KB Output is correct
32 Correct 17 ms 1012 KB Output is correct
33 Correct 5 ms 1012 KB Output is correct
34 Correct 11 ms 1012 KB Output is correct
35 Correct 16 ms 1012 KB Output is correct
36 Correct 15 ms 1012 KB Output is correct
37 Correct 16 ms 1012 KB Output is correct
38 Correct 16 ms 1012 KB Output is correct
39 Correct 16 ms 1012 KB Output is correct
40 Correct 20 ms 1012 KB Output is correct
41 Correct 9 ms 1012 KB Output is correct
42 Correct 13 ms 1012 KB Output is correct
43 Correct 16 ms 1012 KB Output is correct
44 Correct 17 ms 1012 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1012 KB Output is correct
2 Correct 5 ms 1020 KB Output is correct
3 Correct 6 ms 1148 KB Output is correct
4 Correct 3 ms 1148 KB Output is correct
5 Correct 5 ms 1148 KB Output is correct
6 Correct 4 ms 1148 KB Output is correct
7 Correct 3 ms 1148 KB Output is correct
8 Correct 6 ms 1148 KB Output is correct
9 Correct 4 ms 1148 KB Output is correct
10 Correct 6 ms 1148 KB Output is correct
11 Correct 5 ms 1148 KB Output is correct
12 Correct 5 ms 1148 KB Output is correct
13 Correct 3 ms 1148 KB Output is correct
14 Correct 4 ms 1148 KB Output is correct
15 Correct 3 ms 1148 KB Output is correct
16 Correct 5 ms 1148 KB Output is correct
17 Correct 5 ms 1148 KB Output is correct
18 Correct 3 ms 1148 KB Output is correct
19 Correct 6 ms 1148 KB Output is correct
20 Correct 5 ms 1196 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1012 KB Output is correct
2 Correct 5 ms 1020 KB Output is correct
3 Correct 6 ms 1148 KB Output is correct
4 Correct 3 ms 1148 KB Output is correct
5 Correct 5 ms 1148 KB Output is correct
6 Correct 4 ms 1148 KB Output is correct
7 Correct 3 ms 1148 KB Output is correct
8 Correct 6 ms 1148 KB Output is correct
9 Correct 4 ms 1148 KB Output is correct
10 Correct 6 ms 1148 KB Output is correct
11 Correct 5 ms 1148 KB Output is correct
12 Correct 5 ms 1148 KB Output is correct
13 Correct 3 ms 1148 KB Output is correct
14 Correct 4 ms 1148 KB Output is correct
15 Correct 3 ms 1148 KB Output is correct
16 Correct 5 ms 1148 KB Output is correct
17 Correct 5 ms 1148 KB Output is correct
18 Correct 3 ms 1148 KB Output is correct
19 Correct 6 ms 1148 KB Output is correct
20 Correct 5 ms 1196 KB Output is correct
21 Correct 117 ms 6684 KB Output is correct
22 Correct 134 ms 8188 KB Output is correct
23 Correct 89 ms 8188 KB Output is correct
24 Correct 90 ms 8188 KB Output is correct
25 Correct 176 ms 8188 KB Output is correct
26 Correct 37 ms 8188 KB Output is correct
27 Correct 31 ms 8188 KB Output is correct
28 Correct 141 ms 8188 KB Output is correct
29 Correct 101 ms 8188 KB Output is correct
30 Correct 120 ms 8188 KB Output is correct
31 Correct 140 ms 8700 KB Output is correct
32 Correct 137 ms 8700 KB Output is correct
33 Correct 29 ms 8700 KB Output is correct
34 Correct 102 ms 8700 KB Output is correct
35 Correct 92 ms 8700 KB Output is correct
36 Correct 55 ms 8700 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 3 ms 376 KB Output is correct
3 Correct 2 ms 544 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 2 ms 568 KB Output is correct
6 Correct 2 ms 568 KB Output is correct
7 Correct 2 ms 568 KB Output is correct
8 Correct 3 ms 760 KB Output is correct
9 Correct 3 ms 760 KB Output is correct
10 Correct 3 ms 760 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 2 ms 760 KB Output is correct
13 Correct 2 ms 760 KB Output is correct
14 Correct 2 ms 760 KB Output is correct
15 Correct 2 ms 760 KB Output is correct
16 Correct 2 ms 760 KB Output is correct
17 Correct 2 ms 760 KB Output is correct
18 Correct 3 ms 760 KB Output is correct
19 Correct 3 ms 760 KB Output is correct
20 Correct 2 ms 760 KB Output is correct
21 Correct 4 ms 764 KB Output is correct
22 Correct 6 ms 892 KB Output is correct
23 Correct 3 ms 892 KB Output is correct
24 Correct 11 ms 892 KB Output is correct
25 Correct 8 ms 892 KB Output is correct
26 Correct 15 ms 892 KB Output is correct
27 Correct 16 ms 892 KB Output is correct
28 Correct 12 ms 892 KB Output is correct
29 Correct 19 ms 892 KB Output is correct
30 Correct 15 ms 1012 KB Output is correct
31 Correct 17 ms 1012 KB Output is correct
32 Correct 17 ms 1012 KB Output is correct
33 Correct 5 ms 1012 KB Output is correct
34 Correct 11 ms 1012 KB Output is correct
35 Correct 16 ms 1012 KB Output is correct
36 Correct 15 ms 1012 KB Output is correct
37 Correct 16 ms 1012 KB Output is correct
38 Correct 16 ms 1012 KB Output is correct
39 Correct 16 ms 1012 KB Output is correct
40 Correct 20 ms 1012 KB Output is correct
41 Correct 9 ms 1012 KB Output is correct
42 Correct 13 ms 1012 KB Output is correct
43 Correct 16 ms 1012 KB Output is correct
44 Correct 17 ms 1012 KB Output is correct
45 Correct 5 ms 1012 KB Output is correct
46 Correct 5 ms 1020 KB Output is correct
47 Correct 6 ms 1148 KB Output is correct
48 Correct 3 ms 1148 KB Output is correct
49 Correct 5 ms 1148 KB Output is correct
50 Correct 4 ms 1148 KB Output is correct
51 Correct 3 ms 1148 KB Output is correct
52 Correct 6 ms 1148 KB Output is correct
53 Correct 4 ms 1148 KB Output is correct
54 Correct 6 ms 1148 KB Output is correct
55 Correct 5 ms 1148 KB Output is correct
56 Correct 5 ms 1148 KB Output is correct
57 Correct 3 ms 1148 KB Output is correct
58 Correct 4 ms 1148 KB Output is correct
59 Correct 3 ms 1148 KB Output is correct
60 Correct 5 ms 1148 KB Output is correct
61 Correct 5 ms 1148 KB Output is correct
62 Correct 3 ms 1148 KB Output is correct
63 Correct 6 ms 1148 KB Output is correct
64 Correct 5 ms 1196 KB Output is correct
65 Correct 117 ms 6684 KB Output is correct
66 Correct 134 ms 8188 KB Output is correct
67 Correct 89 ms 8188 KB Output is correct
68 Correct 90 ms 8188 KB Output is correct
69 Correct 176 ms 8188 KB Output is correct
70 Correct 37 ms 8188 KB Output is correct
71 Correct 31 ms 8188 KB Output is correct
72 Correct 141 ms 8188 KB Output is correct
73 Correct 101 ms 8188 KB Output is correct
74 Correct 120 ms 8188 KB Output is correct
75 Correct 140 ms 8700 KB Output is correct
76 Correct 137 ms 8700 KB Output is correct
77 Correct 29 ms 8700 KB Output is correct
78 Correct 102 ms 8700 KB Output is correct
79 Correct 92 ms 8700 KB Output is correct
80 Correct 55 ms 8700 KB Output is correct
81 Correct 262 ms 11380 KB Output is correct
82 Correct 310 ms 11508 KB Output is correct
83 Correct 281 ms 11508 KB Output is correct
84 Correct 148 ms 11508 KB Output is correct
85 Incorrect 1983 ms 63136 KB Output isn't correct
86 Halted 0 ms 0 KB -