oj.uz

답안 #210024

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
210024 2020-03-16T11:11:19 Z mieszko11b 가로등 (APIO19_street_lamps) C++14
60 / 100
 5000 ms 314928 KB 
#include <bits/stdc++.h>

using namespace std;

using ii = pair<int, int>;

const int inf = 1e9;

#define X first
#define Y second

vector<ii> P;

int n, q;
char s[300007];
vector<ii> Q;

bool compy(ii a, ii b) {
	return (ii){a.Y, a.X} < (ii){b.Y, b.X};
}

struct SegmentTree1D {
	vector<ii> P;
	vector<int> d;
	int lv;
	int miny, maxy, v;
	
	SegmentTree1D(int L, int R) {
		lv = R - L + 1;
		d.resize(2 * lv + 3);
		P.resize(lv);
		for(int i = 0 ; i < lv ; i++)
			P[i] = ::P[L + i];
		sort(P.begin(), P.end(), compy);
	}
	
	void insert(int w, int l, int r, bool b) {
		if(P[r].Y < miny || P[l].Y > maxy)
			return ;
		if(P[l].Y >= miny && P[r].Y <= maxy) {
			//~ cout << "ins1d on " << l << " " << r << endl;
			d[w] += v;
			return ;
		}
		
		insert(2 * w, l, (l + r) / 2, 0);
		insert(2 * w + 1, (l + r) / 2 + 1, r, 0);
	}
	
	int query(int w, int l, int r, ii p) {
		if(w >= 2 * lv)
			return 0;
		if(P[l].Y > p.Y || (P[l].Y == p.Y && P[l].X > p.X))
			return 0;
		if(p.Y > P[r].Y || (p.Y == P[r].Y && p.X > P[r].X))
			return 0;
		
		int res = d[w];
		res += query(2 * w, l, (l + r) / 2, p);
		res += query(2 * w + 1, (l + r) / 2 + 1, r, p);
		return res;
	}
	
	void insert(int miny, int maxy, int v) {
		this->miny = miny;
		this->maxy = maxy;
		this->v = v;
		insert(1, 0, lv - 1, 0);
	}
	
	int query(ii p) {
		return query(1, 0, lv - 1, p);
	}
};

struct SegmentTree2D {
	int lv;
	vector<SegmentTree1D*> d;
	int maxx, miny, maxy, v;
	
	void build(int w, int l, int r) {
		if(w >= 2 * lv)
			return ;
		d[w] = new SegmentTree1D(l, r);
		build(2 * w, l, (l + r) / 2);
		build(2 * w + 1, (l + r) / 2 + 1, r);
	}
	
	SegmentTree2D() {
		lv = 2;
		sort(P.begin(), P.end());
		P.resize(distance(P.begin(), unique(P.begin(), P.end())));
		
		while(lv < P.size())
			lv *= 2;
		while(P.size() < lv)
			P.push_back({inf, inf});
		
		d.resize(2 * lv + 3);
		build(1, 0, lv - 1);
	}
	
	void insert(int w, int l, int r) {
		if(P[l].X > maxx)
			return ;
		if(P[r].X <= maxx) {
			//~ cout << "ins2d on " << l << " " << r << endl;
			d[w]->insert(miny, maxy, v);
			return ;
		}
		insert(2 * w, l, (l + r) / 2);
		insert(2 * w + 1, (l + r) / 2 + 1, r);
	}
	
	int query(int w, int l, int r, ii p) {
		if(w >= 2 * lv)
			return 0;
		if(P[l] > p)
			return 0;
		if(p > P[r])
			return 0;
			
		int res = d[w]->query(p);
		res += query(2 * w, l, (l + r) / 2, p);
		res += query(2 * w + 1, (l + r) / 2 + 1, r, p);
		return res;
	}
	
	void insert(int maxx, int miny, int maxy, int v) {
		//~ cout << "ins x<=" << maxx << " y>=" << miny << endl;
		this->maxx = maxx;
		this->miny = miny;
		this->maxy = maxy;
		this->v = v;
		insert(1, 0, lv - 1);
	}
	
	int query(ii p) {
		return query(1, 0, lv - 1, p);
	}
};

SegmentTree2D *ST;
set<ii> segments;

void init_segments() {
	for(int i = 1 ; i <= n ; ) {
		int j = i;
		while(j <= n && s[j] == '1')
			j++;
		if(j > i)
			segments.insert({i, j - 1});
		i = j + 1;
	}
}

int query(ii p, int t) {
	bool active = false;
	auto it = segments.upper_bound({p.X, inf});
	if(it != segments.begin()) {
		it = prev(it);
		auto p2 = *it;
		if(p2.Y >= p.Y)
			active = true;
	}
	
	int v = ST->query(p);
	
	//~ cout << "query " << p.X <<  " " << p.Y << " " << active << " " << v << " " << t << endl;
	
	if(active)
		v += t;
	return v;
}

void tree_insert(int a, int b, int c, int d, int v) {
	//~ cout << "ins" << a << " "  << b <<  " " << c << " " << d << " " << v << endl;
	ST->insert(b, c, d, v);
	ST->insert(a - 1, c, d, -v);
}

void light_up(int i, int t) {
	auto rightit = segments.upper_bound((ii){i, inf});
	auto leftit = segments.end();
	if(rightit != segments.begin())
		leftit = prev(rightit);
		
	ii left = {-inf, -inf}, right = {inf, inf};
	if(rightit != segments.end()) right = *rightit;
	if(leftit != segments.end()) left = *leftit;
	
	if(left.Y == i - 1 && right.X == i + 1) {
		tree_insert(left.X, i, i, right.Y, -t);
		segments.erase(left);
		segments.erase(right);
		segments.insert({left.X, right.Y});
	} else if(left.Y == i - 1) {
		tree_insert(left.X, i, i, i, -t);
		segments.erase(left);
		segments.insert({left.X, i});
	} else if(right.X == i + 1) {
		tree_insert(i, i, i, right.Y, -t);
		segments.erase(right);
		segments.insert({i, right.Y});
	} else {
		tree_insert(i, i, i, i, -t);
		segments.insert({i, i});
	}
}

void light_down(int i, int t) {
	auto it = segments.upper_bound((ii){i, inf});
	it = prev(it);
	ii seg = *it;
	
	tree_insert(seg.X, i, i, seg.Y, t);
	segments.erase(seg);
	if(seg.X <= i - 1)
		segments.insert({seg.X, i - 1});
	if(i + 1 <= seg.Y)
		segments.insert({i + 1, seg.Y});
}

void toggle(int i, int t) {
	if(s[i] == '1') {
		s[i] = '0';
		light_down(i, t);
	} else {
		s[i] = '1';
		light_up(i, t);
	}
}

int main() {
	scanf("%d%d", &n, &q);
	scanf(" %s", s + 1);
	
	for(int i = 0 ; i < q ; i++) {
		char comm[10];
		scanf(" %s", comm);
		if(comm[0] == 't') {
			int i;
			scanf("%d", &i);
			Q.emplace_back(i, -1);
		} else {
			int a, b;
			scanf("%d%d", &a, &b);
			Q.emplace_back(a, b);
			P.push_back({a, b - 1});
		}
	}

	ST = new SegmentTree2D();
	
	//~ for(auto p : P)
		//~ cout << p.X << " " << p.Y << "; " ;
	//~ cout << endl;
	init_segments();
	
	int t = 1;
	for(auto q : Q) {
		//~ cout << "S: ";
		//~ for(auto p : segments)
			//~ cout << p.X << " " << p.Y << "; ";
		//~ cout << endl;
		
		if(q.Y == -1)
			toggle(q.X, t);
		else
			printf("%d\n", query({q.X, q.Y - 1}, t));
		t++;
	}
	
	return 0;
}

Compilation message

street_lamps.cpp: In constructor 'SegmentTree2D::SegmentTree2D()':
street_lamps.cpp:94:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(lv < P.size())
         ~~~^~~~~~~~~~
street_lamps.cpp:96:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(P.size() < lv)
         ~~~~~~~~~^~~~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:235:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &q);
  ~~~~~^~~~~~~~~~~~~~~~
street_lamps.cpp:236:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %s", s + 1);
  ~~~~~^~~~~~~~~~~~~~
street_lamps.cpp:240:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %s", comm);
   ~~~~~^~~~~~~~~~~~~
street_lamps.cpp:243:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &i);
    ~~~~~^~~~~~~~~~
street_lamps.cpp:247:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d", &a, &b);
    ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 6 ms 256 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 290 ms 6752 KB Output is correct
2 Correct 374 ms 6880 KB Output is correct
3 Correct 680 ms 8816 KB Output is correct
4 Correct 2237 ms 80220 KB Output is correct
5 Correct 2820 ms 157132 KB Output is correct
6 Correct 1800 ms 79984 KB Output is correct
7 Correct 3497 ms 153676 KB Output is correct
8 Correct 3587 ms 155084 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 6 ms 504 KB Output is correct
3 Correct 8 ms 760 KB Output is correct
4 Correct 8 ms 760 KB Output is correct
5 Correct 563 ms 8388 KB Output is correct
6 Correct 2078 ms 79512 KB Output is correct
7 Correct 3411 ms 156480 KB Output is correct
8 Correct 4945 ms 312896 KB Output is correct
9 Correct 679 ms 8916 KB Output is correct
10 Correct 687 ms 7372 KB Output is correct
11 Correct 827 ms 13632 KB Output is correct
12 Correct 4855 ms 311360 KB Output is correct
13 Correct 4918 ms 312848 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 760 KB Output is correct
2 Correct 8 ms 760 KB Output is correct
3 Correct 7 ms 504 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Execution timed out 5119 ms 314928 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 6 ms 256 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 290 ms 6752 KB Output is correct
9 Correct 374 ms 6880 KB Output is correct
10 Correct 680 ms 8816 KB Output is correct
11 Correct 2237 ms 80220 KB Output is correct
12 Correct 2820 ms 157132 KB Output is correct
13 Correct 1800 ms 79984 KB Output is correct
14 Correct 3497 ms 153676 KB Output is correct
15 Correct 3587 ms 155084 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 6 ms 504 KB Output is correct
18 Correct 8 ms 760 KB Output is correct
19 Correct 8 ms 760 KB Output is correct
20 Correct 563 ms 8388 KB Output is correct
21 Correct 2078 ms 79512 KB Output is correct
22 Correct 3411 ms 156480 KB Output is correct
23 Correct 4945 ms 312896 KB Output is correct
24 Correct 679 ms 8916 KB Output is correct
25 Correct 687 ms 7372 KB Output is correct
26 Correct 827 ms 13632 KB Output is correct
27 Correct 4855 ms 311360 KB Output is correct
28 Correct 4918 ms 312848 KB Output is correct
29 Correct 8 ms 760 KB Output is correct
30 Correct 8 ms 760 KB Output is correct
31 Correct 7 ms 504 KB Output is correct
32 Correct 5 ms 376 KB Output is correct
33 Execution timed out 5119 ms 314928 KB Time limit exceeded
34 Halted 0 ms 0 KB -