oj.uz

Submission #386784

# Submission time Handle Problem Language Result Execution time Memory
386784 2021-04-07T09:54:24 Z clifter Street Lamps (APIO19_street_lamps) C++14
100 / 100
 1555 ms 56368 KB 
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 300005;
using lint = long long;
using pi = pair<int, int>;

struct bit{
	int tree[MAXN];
	void add(int x, int v){
		while(x < MAXN){
			tree[x] += v;
			x += x & -x;
		}
	}
	int query(int x){
		int ret = 0;
		while(x){
			ret += tree[x];
			x -= x & -x;
		}
		return ret;
	}
}bit;

struct intv{
	int s, e, x;
	bool operator<(const intv &i)const{
		return s < i.s;
	}
};

struct event{
	int x, y, t, type;
	bool operator<(const event &e)const{
		return pi(x, y) < pi(e.x, e.y);
	}
};

int ret[MAXN];
vector<event> ev;
set<intv> s;

void add_rect(int s, int e, int x){
	ev.push_back({s, s, +x, 1});
	ev.push_back({s, e + 1, -x, 1});
	ev.push_back({e + 1, s, -x, 1});
	ev.push_back({e + 1, e + 1, +x, 1});
}

void solve(int s, int e){
	if(s == e) return;
	int m = (s+e)/2;
	solve(s, m);
	solve(m + 1, e);
	vector<event> pupd, quer;
	for(int i=s; i<=m; i++){
		if(ev[i].type == 1){
			pupd.push_back(ev[i]);
		}
	}
	for(int i=m+1; i<=e; i++){
		if(ev[i].type == 2){
			quer.push_back(ev[i]);
		}
	}
	sort(pupd.begin(), pupd.end());
	sort(quer.begin(), quer.end());
	int ptr = 0;
	for(auto &i : quer){
		while(ptr < pupd.size() && pupd[ptr].x <= i.x){
			bit.add(pupd[ptr].y, pupd[ptr].t);
			ptr++;
		}
		ret[i.t] += bit.query(i.y);
	}
	for(int i=0; i<ptr; i++){
		bit.add(pupd[i].y, -pupd[i].t);
	}
}

int n, q;
char str[MAXN];

int main(){
	scanf("%d %d",&n,&q);
	scanf("%s", str + 1);
	for(int i=1; i<=n; ){
		if(str[i] == '0'){
			i++;
			continue;
		}
		int e = i;
		while(e <= n && str[e] == '1') e++;
		s.insert({i, e - 1, 1});
		i = e;
	}
	char buf[10];
	for(int i=1; i<=q; i++){
		scanf("%s", buf);
		if(*buf == 't'){
			int t; scanf("%d",&t);
			if(str[t] == '0'){
				int st = t, ed = t;
				auto l = s.lower_bound({t + 1, -1, -1});
				if(l != s.end() && l->s == t + 1){
					add_rect(l->s, l->e, i + 1 - l->x);
					ed = l->e;
					l = s.erase(l);
				}
				if(l != s.begin() && prev(l)->e == t - 1){
					l--;
					add_rect(l->s, l->e, i + 1 - l->x);
					st = l->s;
					s.erase(l);
				}
				s.insert({st, ed, i + 1});
			}
			if(str[t] == '1'){
				auto l = --s.lower_bound({t + 1, -1, -1});
				add_rect(l->s, l->e, i + 1 - l->x);
				vector<intv> newV;
				if(l->s < t){
					newV.push_back({l->s, t - 1, i + 1});
				}
				if(t < l->e){
					newV.push_back({t + 1, l->e, i + 1});
				}
				s.erase(l);
				for(auto &i : newV) s.insert(i);
			}
			str[t] ^= 1;
			ret[i] = -1;
		}
		else{
			int a, b; scanf("%d %d",&a,&b);
			b--;
			ev.push_back({a, b, i, 2});
			auto l = s.lower_bound({a + 1, -1, -1});
			if(l != s.begin()){
				l--;
				if(l->s <= a && b <= l->e){
					ret[i] += i + 1 - l->x;
				}
			}
		}
	}
	solve(0, ev.size() - 1);
	for(int i=1; i<=q; i++){
		if(ret[i] >= 0) printf("%d\n", ret[i]);
	}
}

Compilation message

street_lamps.cpp: In function 'void solve(int, int)':
street_lamps.cpp:70:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<event>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   while(ptr < pupd.size() && pupd[ptr].x <= i.x){
      |         ~~~~^~~~~~~~~~~~~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:85:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |  scanf("%d %d",&n,&q);
      |  ~~~~~^~~~~~~~~~~~~~~
street_lamps.cpp:86:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   86 |  scanf("%s", str + 1);
      |  ~~~~~^~~~~~~~~~~~~~~
street_lamps.cpp:99:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   99 |   scanf("%s", buf);
      |   ~~~~~^~~~~~~~~~~
street_lamps.cpp:101:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  101 |    int t; scanf("%d",&t);
      |           ~~~~~^~~~~~~~~
street_lamps.cpp:135:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  135 |    int a, b; scanf("%d %d",&a,&b);
      |              ~~~~~^~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 508 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1054 ms 26164 KB Output is correct
2 Correct 1170 ms 26164 KB Output is correct
3 Correct 1072 ms 26356 KB Output is correct
4 Correct 1187 ms 32328 KB Output is correct
5 Correct 1423 ms 40708 KB Output is correct
6 Correct 982 ms 40584 KB Output is correct
7 Correct 410 ms 18900 KB Output is correct
8 Correct 377 ms 18944 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 492 KB Output is correct
2 Correct 4 ms 492 KB Output is correct
3 Correct 4 ms 448 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 1459 ms 49552 KB Output is correct
6 Correct 1555 ms 53456 KB Output is correct
7 Correct 1304 ms 40068 KB Output is correct
8 Correct 425 ms 18888 KB Output is correct
9 Correct 242 ms 11860 KB Output is correct
10 Correct 254 ms 14920 KB Output is correct
11 Correct 228 ms 14920 KB Output is correct
12 Correct 460 ms 18900 KB Output is correct
13 Correct 442 ms 18988 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 492 KB Output is correct
2 Correct 3 ms 492 KB Output is correct
3 Correct 3 ms 492 KB Output is correct
4 Correct 3 ms 492 KB Output is correct
5 Correct 576 ms 19388 KB Output is correct
6 Correct 884 ms 34748 KB Output is correct
7 Correct 1016 ms 40544 KB Output is correct
8 Correct 1248 ms 56368 KB Output is correct
9 Correct 942 ms 35680 KB Output is correct
10 Correct 1038 ms 48656 KB Output is correct
11 Correct 974 ms 35644 KB Output is correct
12 Correct 1030 ms 48748 KB Output is correct
13 Correct 914 ms 35632 KB Output is correct
14 Correct 1046 ms 48808 KB Output is correct
15 Correct 449 ms 18936 KB Output is correct
16 Correct 428 ms 18880 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 508 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1054 ms 26164 KB Output is correct
9 Correct 1170 ms 26164 KB Output is correct
10 Correct 1072 ms 26356 KB Output is correct
11 Correct 1187 ms 32328 KB Output is correct
12 Correct 1423 ms 40708 KB Output is correct
13 Correct 982 ms 40584 KB Output is correct
14 Correct 410 ms 18900 KB Output is correct
15 Correct 377 ms 18944 KB Output is correct
16 Correct 3 ms 492 KB Output is correct
17 Correct 4 ms 492 KB Output is correct
18 Correct 4 ms 448 KB Output is correct
19 Correct 2 ms 364 KB Output is correct
20 Correct 1459 ms 49552 KB Output is correct
21 Correct 1555 ms 53456 KB Output is correct
22 Correct 1304 ms 40068 KB Output is correct
23 Correct 425 ms 18888 KB Output is correct
24 Correct 242 ms 11860 KB Output is correct
25 Correct 254 ms 14920 KB Output is correct
26 Correct 228 ms 14920 KB Output is correct
27 Correct 460 ms 18900 KB Output is correct
28 Correct 442 ms 18988 KB Output is correct
29 Correct 3 ms 492 KB Output is correct
30 Correct 3 ms 492 KB Output is correct
31 Correct 3 ms 492 KB Output is correct
32 Correct 3 ms 492 KB Output is correct
33 Correct 576 ms 19388 KB Output is correct
34 Correct 884 ms 34748 KB Output is correct
35 Correct 1016 ms 40544 KB Output is correct
36 Correct 1248 ms 56368 KB Output is correct
37 Correct 942 ms 35680 KB Output is correct
38 Correct 1038 ms 48656 KB Output is correct
39 Correct 974 ms 35644 KB Output is correct
40 Correct 1030 ms 48748 KB Output is correct
41 Correct 914 ms 35632 KB Output is correct
42 Correct 1046 ms 48808 KB Output is correct
43 Correct 449 ms 18936 KB Output is correct
44 Correct 428 ms 18880 KB Output is correct
45 Correct 621 ms 17700 KB Output is correct
46 Correct 691 ms 18352 KB Output is correct
47 Correct 658 ms 21472 KB Output is correct
48 Correct 1105 ms 37564 KB Output is correct
49 Correct 280 ms 16328 KB Output is correct
50 Correct 269 ms 16200 KB Output is correct
51 Correct 257 ms 16328 KB Output is correct
52 Correct 254 ms 16712 KB Output is correct
53 Correct 251 ms 16840 KB Output is correct
54 Correct 253 ms 16712 KB Output is correct