oj.uz

Submission #55495

# Submission time Handle Problem Language Result Execution time Memory
55495 2018-07-07T19:50:41 Z ksun48 Cultivation (JOI17_cultivation) C++14
30 / 100
 18 ms 1276 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(int 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;
	}
	set<int> times;
	for(pair<int,int> z : seeds){
		times.insert(z.first);
		times.insert(z.first + x + 1);
	}
	vector<int> pos;
	for(int t : times){
		pos.push_back(t);
	}
	vector<int> ups;
	vector<int> downs;
	vector<int> totals;

	for(int i = 0; i < pos.size(); i++){
		// use -pos[i]-x, x-pos[i]+1 for start and end
		// where start and end column is relative to your column
		// replace this with lookup of up, down totals for each 
		int a = idx(pos[i]);
		int b = idx(pos[i]-x-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);
	}

	for(int i = 0; i < xlist.size(); i++){
		for(int j = 0; j <= i; j++){
			vector<int> stuff;
			int tot = 0;
			for(int k = 0; k < seeds.size(); k++){
				int p = seeds[k].first;
				if(p <= xlist[i] && p > xlist[j]){
					stuff.push_back(seeds[k].second);
				}
			}
			for(int i = 0; i + 1 < stuff.size(); i++){
				tot = max(tot, stuff[i+1] - stuff[i]);
			}
			if(stuff.size() == 0){
				total[i][j] = up[i][j] = down[i][j] = c+1;
			} else {
				assert(i > j);
				up[i][j] = stuff[0] - 0;
				down[i][j] = c-1 - stuff[stuff.size()-1];
				total[i][j] = tot;
			}
		}
	}

	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:92:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < pos.size(); i++){
                 ~~^~~~~~~~~~~~
cultivation.cpp:93:11: 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:130:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < xlist.size(); i++){
                 ~~^~~~~~~~~~~~~~
cultivation.cpp:134:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int k = 0; k < seeds.size(); k++){
                   ~~^~~~~~~~~~~~~~
cultivation.cpp:140:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i + 1 < stuff.size(); i++){
                   ~~~~~~^~~~~~~~~~~~~~

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 428 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 2 ms 560 KB Output is correct
6 Correct 2 ms 560 KB Output is correct
7 Correct 3 ms 560 KB Output is correct
8 Correct 3 ms 560 KB Output is correct
9 Correct 2 ms 560 KB Output is correct
10 Correct 2 ms 564 KB Output is correct
11 Correct 2 ms 564 KB Output is correct
12 Correct 2 ms 620 KB Output is correct
13 Correct 2 ms 620 KB Output is correct
14 Correct 2 ms 620 KB Output is correct
15 Correct 2 ms 748 KB Output is correct
16 Correct 2 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 428 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 2 ms 560 KB Output is correct
6 Correct 2 ms 560 KB Output is correct
7 Correct 3 ms 560 KB Output is correct
8 Correct 3 ms 560 KB Output is correct
9 Correct 2 ms 560 KB Output is correct
10 Correct 2 ms 564 KB Output is correct
11 Correct 2 ms 564 KB Output is correct
12 Correct 2 ms 620 KB Output is correct
13 Correct 2 ms 620 KB Output is correct
14 Correct 2 ms 620 KB Output is correct
15 Correct 2 ms 748 KB Output is correct
16 Correct 2 ms 748 KB Output is correct
17 Correct 2 ms 748 KB Output is correct
18 Correct 5 ms 764 KB Output is correct
19 Correct 4 ms 764 KB Output is correct
20 Correct 3 ms 764 KB Output is correct
21 Correct 5 ms 764 KB Output is correct
22 Correct 6 ms 764 KB Output is correct
23 Correct 3 ms 764 KB Output is correct
24 Correct 11 ms 764 KB Output is correct
25 Correct 7 ms 764 KB Output is correct
26 Correct 13 ms 892 KB Output is correct
27 Correct 15 ms 892 KB Output is correct
28 Correct 9 ms 892 KB Output is correct
29 Correct 13 ms 892 KB Output is correct
30 Correct 15 ms 892 KB Output is correct
31 Correct 14 ms 892 KB Output is correct
32 Correct 14 ms 892 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 428 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 2 ms 560 KB Output is correct
6 Correct 2 ms 560 KB Output is correct
7 Correct 3 ms 560 KB Output is correct
8 Correct 3 ms 560 KB Output is correct
9 Correct 2 ms 560 KB Output is correct
10 Correct 2 ms 564 KB Output is correct
11 Correct 2 ms 564 KB Output is correct
12 Correct 2 ms 620 KB Output is correct
13 Correct 2 ms 620 KB Output is correct
14 Correct 2 ms 620 KB Output is correct
15 Correct 2 ms 748 KB Output is correct
16 Correct 2 ms 748 KB Output is correct
17 Correct 2 ms 748 KB Output is correct
18 Correct 5 ms 764 KB Output is correct
19 Correct 4 ms 764 KB Output is correct
20 Correct 3 ms 764 KB Output is correct
21 Correct 5 ms 764 KB Output is correct
22 Correct 6 ms 764 KB Output is correct
23 Correct 3 ms 764 KB Output is correct
24 Correct 11 ms 764 KB Output is correct
25 Correct 7 ms 764 KB Output is correct
26 Correct 13 ms 892 KB Output is correct
27 Correct 15 ms 892 KB Output is correct
28 Correct 9 ms 892 KB Output is correct
29 Correct 13 ms 892 KB Output is correct
30 Correct 15 ms 892 KB Output is correct
31 Correct 14 ms 892 KB Output is correct
32 Correct 14 ms 892 KB Output is correct
33 Correct 5 ms 892 KB Output is correct
34 Correct 10 ms 892 KB Output is correct
35 Correct 15 ms 892 KB Output is correct
36 Correct 15 ms 892 KB Output is correct
37 Correct 13 ms 892 KB Output is correct
38 Correct 17 ms 892 KB Output is correct
39 Correct 14 ms 892 KB Output is correct
40 Correct 15 ms 892 KB Output is correct
41 Correct 9 ms 892 KB Output is correct
42 Correct 12 ms 892 KB Output is correct
43 Correct 14 ms 892 KB Output is correct
44 Correct 14 ms 892 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 892 KB Output is correct
2 Correct 18 ms 1176 KB Output is correct
3 Correct 14 ms 1176 KB Output is correct
4 Incorrect 11 ms 1276 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 892 KB Output is correct
2 Correct 18 ms 1176 KB Output is correct
3 Correct 14 ms 1176 KB Output is correct
4 Incorrect 11 ms 1276 KB Output isn't correct
5 Halted 0 ms 0 KB -

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 428 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 2 ms 560 KB Output is correct
6 Correct 2 ms 560 KB Output is correct
7 Correct 3 ms 560 KB Output is correct
8 Correct 3 ms 560 KB Output is correct
9 Correct 2 ms 560 KB Output is correct
10 Correct 2 ms 564 KB Output is correct
11 Correct 2 ms 564 KB Output is correct
12 Correct 2 ms 620 KB Output is correct
13 Correct 2 ms 620 KB Output is correct
14 Correct 2 ms 620 KB Output is correct
15 Correct 2 ms 748 KB Output is correct
16 Correct 2 ms 748 KB Output is correct
17 Correct 2 ms 748 KB Output is correct
18 Correct 5 ms 764 KB Output is correct
19 Correct 4 ms 764 KB Output is correct
20 Correct 3 ms 764 KB Output is correct
21 Correct 5 ms 764 KB Output is correct
22 Correct 6 ms 764 KB Output is correct
23 Correct 3 ms 764 KB Output is correct
24 Correct 11 ms 764 KB Output is correct
25 Correct 7 ms 764 KB Output is correct
26 Correct 13 ms 892 KB Output is correct
27 Correct 15 ms 892 KB Output is correct
28 Correct 9 ms 892 KB Output is correct
29 Correct 13 ms 892 KB Output is correct
30 Correct 15 ms 892 KB Output is correct
31 Correct 14 ms 892 KB Output is correct
32 Correct 14 ms 892 KB Output is correct
33 Correct 5 ms 892 KB Output is correct
34 Correct 10 ms 892 KB Output is correct
35 Correct 15 ms 892 KB Output is correct
36 Correct 15 ms 892 KB Output is correct
37 Correct 13 ms 892 KB Output is correct
38 Correct 17 ms 892 KB Output is correct
39 Correct 14 ms 892 KB Output is correct
40 Correct 15 ms 892 KB Output is correct
41 Correct 9 ms 892 KB Output is correct
42 Correct 12 ms 892 KB Output is correct
43 Correct 14 ms 892 KB Output is correct
44 Correct 14 ms 892 KB Output is correct
45 Correct 6 ms 892 KB Output is correct
46 Correct 18 ms 1176 KB Output is correct
47 Correct 14 ms 1176 KB Output is correct
48 Incorrect 11 ms 1276 KB Output isn't correct
49 Halted 0 ms 0 KB -