oj.uz

Submission #210022

# Submission time Handle Problem Language Result Execution time Memory
210022 2020-03-16T11:04:05 Z mieszko11b Street Lamps (APIO19_street_lamps) C++14
60 / 100
 5000 ms 298544 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;
	
	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, int miny, int v) {
		if(P[r].Y < miny)
			return ;
		if(P[l].Y >= miny) {
			//~ cout << "ins1d on " << l << " " << r << endl;
			d[w] += v;
			return ;
		}
		
		insert(2 * w, l, (l + r) / 2, miny, v);
		insert(2 * w + 1, (l + r) / 2 + 1, r, miny, v);
	}
	
	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 v) {
		insert(1, 0, lv - 1, miny, v);
	}
	
	int query(ii p) {
		return query(1, 0, lv - 1, p);
	}
};

struct SegmentTree2D {
	int lv;
	vector<SegmentTree1D*> d;
	
	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, int maxx, int miny, int v) {
		if(P[l].X > maxx)
			return ;
		if(P[r].X <= maxx) {
			//~ cout << "ins2d on " << l << " " << r << endl;
			d[w]->insert(miny, v);
			return ;
		}
		insert(2 * w, l, (l + r) / 2, maxx, miny, v);
		insert(2 * w + 1, (l + r) / 2 + 1, r, maxx, miny, v);
	}
	
	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 v) {
		//~ cout << "ins x<=" << maxx << " y>=" << miny << endl;
		insert(1, 0, lv - 1, maxx, miny, v);
	}
	
	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, v);
	ST->insert(a - 1, c, -v);
	ST->insert(b, d + 1, -v);
	ST->insert(a - 1, d + 1, 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:89:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(lv < P.size())
         ~~~^~~~~~~~~~
street_lamps.cpp:91:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(P.size() < lv)
         ~~~~~~~~~^~~~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:228:7: 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:229:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %s", s + 1);
  ~~~~~^~~~~~~~~~~~~~
street_lamps.cpp:233:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %s", comm);
   ~~~~~^~~~~~~~~~~~~
street_lamps.cpp:236:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &i);
    ~~~~~^~~~~~~~~~
street_lamps.cpp:240:9: 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

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 248 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

# Verdict Execution time Memory Grader output
1 Correct 311 ms 6748 KB Output is correct
2 Correct 416 ms 6876 KB Output is correct
3 Correct 717 ms 8668 KB Output is correct
4 Correct 2319 ms 76152 KB Output is correct
5 Correct 2862 ms 148964 KB Output is correct
6 Correct 1812 ms 75868 KB Output is correct
7 Correct 3687 ms 145484 KB Output is correct
8 Correct 3655 ms 146892 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 6 ms 504 KB Output is correct
3 Correct 7 ms 760 KB Output is correct
4 Correct 8 ms 760 KB Output is correct
5 Correct 879 ms 8284 KB Output is correct
6 Correct 2647 ms 75356 KB Output is correct
7 Correct 3710 ms 148432 KB Output is correct
8 Correct 4719 ms 296396 KB Output is correct
9 Correct 664 ms 8656 KB Output is correct
10 Correct 645 ms 7232 KB Output is correct
11 Correct 825 ms 13132 KB Output is correct
12 Correct 4782 ms 295112 KB Output is correct
13 Correct 4809 ms 296400 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 760 KB Output is correct
2 Correct 8 ms 760 KB Output is correct
3 Correct 7 ms 508 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Execution timed out 5029 ms 298544 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 248 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 311 ms 6748 KB Output is correct
9 Correct 416 ms 6876 KB Output is correct
10 Correct 717 ms 8668 KB Output is correct
11 Correct 2319 ms 76152 KB Output is correct
12 Correct 2862 ms 148964 KB Output is correct
13 Correct 1812 ms 75868 KB Output is correct
14 Correct 3687 ms 145484 KB Output is correct
15 Correct 3655 ms 146892 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 6 ms 504 KB Output is correct
18 Correct 7 ms 760 KB Output is correct
19 Correct 8 ms 760 KB Output is correct
20 Correct 879 ms 8284 KB Output is correct
21 Correct 2647 ms 75356 KB Output is correct
22 Correct 3710 ms 148432 KB Output is correct
23 Correct 4719 ms 296396 KB Output is correct
24 Correct 664 ms 8656 KB Output is correct
25 Correct 645 ms 7232 KB Output is correct
26 Correct 825 ms 13132 KB Output is correct
27 Correct 4782 ms 295112 KB Output is correct
28 Correct 4809 ms 296400 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 508 KB Output is correct
32 Correct 5 ms 376 KB Output is correct
33 Execution timed out 5029 ms 298544 KB Time limit exceeded
34 Halted 0 ms 0 KB -