oj.uz

Submission #535700

# Submission time Handle Problem Language Result Execution time Memory
535700 2022-03-11T00:37:31 Z lunchbox Street Lamps (APIO19_street_lamps) C++17
100 / 100
 3769 ms 424004 KB 
#include <stdio.h>
#include <stdlib.h>

#define N	300000
#define L	18

struct T {
	int x;
	T *l, *r;
};
 
struct T *node() {
	T *t = (T *) calloc(1, sizeof *t);

	t->x = 0;
	t->l = t->r = NULL;
	return t;
}
 
void st_update(struct T *t, int l, int r, int i, int x) {
	int m;

	if (l == r) {
		t->x += x;
		return;
	}
	m = (l + r) / 2;
	if (i <= m) {
		if (t->l == NULL)
			t->l = node();
		st_update(t->l, l, m, i, x);
	} else {
		if (t->r == NULL)
			t->r = node();
		st_update(t->r, m + 1, r, i, x);
	}
	t->x = (t->l == NULL ? 0 : t->l->x) + (t->r == NULL ? 0 : t->r->x);
}
 
int st_query(struct T *t, int l, int r, int ql, int qr) {
	int m;
 
	if (t == NULL)
		return 0;
	if (ql <= l && r <= qr)
		return t->x;
	if (qr < l || ql > r)
		return 0;
	m = (l + r) / 2;
	return st_query(t->l, l, m, ql, qr) + st_query(t->r, m + 1, r, ql, qr);
}
 
struct T *ft1[N + 1];
int ft2[N], n;
 
void ft1_update(int i, int j, int x) {
	if (j > n)
		return;
	while (i <= n) {
		st_update(ft1[i], 0, n, j, x);
		i |= i + 1;
	}
}
 
int ft1_query(int i, int j) {
	int sum = 0;
 
	while (i >= 0) {
		sum += st_query(ft1[i], 0, n, 0, j);
		i &= i + 1, i--;
	}
	return sum;
}
 
void ft2_update(int i, int x) {
	while (i < n) {
		ft2[i] += x;
		i |= i + 1;
	}
}
 
int ft2_query(int i) {
	int sum = 0;
 
	while (i >= 0) {
		sum += ft2[i];
		i &= i + 1, i--;
	}
	return sum;
}

int find_left(int i) {
	int i_ = i, x = ft2_query(i - 1);

	for (int m = 1 << L; m >= 1; m >>= 1)
		if (i_ - m >= 0 && x - ft2_query(i_ - m - 1) == i - (i_ - m))
			i_ -= m;
	return i_;
}

int find_right(int i) {
	int i_ = i, x = ft2_query(i - 1);

	for (int m = 1 << L; m >= 1; m >>= 1)
		if (i_ + m <= n && ft2_query(i_ + m - 1) - x == (i_ + m) - i)
			i_ += m;
	return i_;
}

void update(int l, int l_, int r, int r_, int x) {
	ft1_update(l, r, x);
	ft1_update(l, r_ + 1, -x);
	ft1_update(l_ + 1, r, -x);
	ft1_update(l_ + 1, r_ + 1, x);
}

int main() {
	static char cc[N];
	int q;

	scanf("%d%d", &n, &q);
	for (int i = 0; i <= n; i++)
		ft1[i] = node();
	scanf("%s", cc);
	for (int i = 0; i < n; i++)
		if (cc[i] == '1')
			ft2_update(i, +1);
	for (int h = 1; h <= q; h++) {
		static char s[8];

		scanf("%s", s);
		if (s[0] == 'q') {
			int l, r, sum;

			scanf("%d%d", &l, &r), l--, r--;
			sum = ft1_query(l, r);
			if (ft2_query(r - 1) - ft2_query(l - 1) == r - l)
				sum += h;
			printf("%d\n", sum);
		} else {
			int i;

			scanf("%d", &i), i--;
			if (cc[i] == '1') {
				update(find_left(i), i, i + 1, find_right(i + 1), +h);
				ft2_update(i, -1);
				cc[i] = '0';
			} else {
				update(find_left(i), i, i + 1, find_right(i + 1), -h);
				ft2_update(i, +1);
				cc[i] = '1';
			}
		}
	}
	return 0;
}

Compilation message

street_lamps.cpp: In function 'int main()':
street_lamps.cpp:121:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
street_lamps.cpp:124:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  124 |  scanf("%s", cc);
      |  ~~~~~^~~~~~~~~~
street_lamps.cpp:131:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |   scanf("%s", s);
      |   ~~~~~^~~~~~~~~
street_lamps.cpp:135:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  135 |    scanf("%d%d", &l, &r), l--, r--;
      |    ~~~~~^~~~~~~~~~~~~~~~
street_lamps.cpp:143:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  143 |    scanf("%d", &i), i--;
      |    ~~~~~^~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 272 ms 1344 KB Output is correct
2 Correct 380 ms 5040 KB Output is correct
3 Correct 750 ms 11576 KB Output is correct
4 Correct 2285 ms 282128 KB Output is correct
5 Correct 2130 ms 267548 KB Output is correct
6 Correct 2603 ms 301188 KB Output is correct
7 Correct 223 ms 18852 KB Output is correct
8 Correct 260 ms 21356 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1108 KB Output is correct
2 Correct 4 ms 920 KB Output is correct
3 Correct 2 ms 724 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 3769 ms 424004 KB Output is correct
6 Correct 2781 ms 358692 KB Output is correct
7 Correct 1877 ms 266916 KB Output is correct
8 Correct 258 ms 21384 KB Output is correct
9 Correct 93 ms 3988 KB Output is correct
10 Correct 111 ms 4232 KB Output is correct
11 Correct 112 ms 4436 KB Output is correct
12 Correct 205 ms 18880 KB Output is correct
13 Correct 256 ms 21412 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 2 ms 688 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 3 ms 944 KB Output is correct
5 Correct 303 ms 35140 KB Output is correct
6 Correct 1360 ms 227324 KB Output is correct
7 Correct 2274 ms 300820 KB Output is correct
8 Correct 3439 ms 347680 KB Output is correct
9 Correct 428 ms 4268 KB Output is correct
10 Correct 341 ms 3312 KB Output is correct
11 Correct 444 ms 4340 KB Output is correct
12 Correct 318 ms 3328 KB Output is correct
13 Correct 410 ms 4292 KB Output is correct
14 Correct 343 ms 3332 KB Output is correct
15 Correct 204 ms 18856 KB Output is correct
16 Correct 241 ms 21360 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 272 ms 1344 KB Output is correct
9 Correct 380 ms 5040 KB Output is correct
10 Correct 750 ms 11576 KB Output is correct
11 Correct 2285 ms 282128 KB Output is correct
12 Correct 2130 ms 267548 KB Output is correct
13 Correct 2603 ms 301188 KB Output is correct
14 Correct 223 ms 18852 KB Output is correct
15 Correct 260 ms 21356 KB Output is correct
16 Correct 3 ms 1108 KB Output is correct
17 Correct 4 ms 920 KB Output is correct
18 Correct 2 ms 724 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 3769 ms 424004 KB Output is correct
21 Correct 2781 ms 358692 KB Output is correct
22 Correct 1877 ms 266916 KB Output is correct
23 Correct 258 ms 21384 KB Output is correct
24 Correct 93 ms 3988 KB Output is correct
25 Correct 111 ms 4232 KB Output is correct
26 Correct 112 ms 4436 KB Output is correct
27 Correct 205 ms 18880 KB Output is correct
28 Correct 256 ms 21412 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 2 ms 688 KB Output is correct
31 Correct 3 ms 852 KB Output is correct
32 Correct 3 ms 944 KB Output is correct
33 Correct 303 ms 35140 KB Output is correct
34 Correct 1360 ms 227324 KB Output is correct
35 Correct 2274 ms 300820 KB Output is correct
36 Correct 3439 ms 347680 KB Output is correct
37 Correct 428 ms 4268 KB Output is correct
38 Correct 341 ms 3312 KB Output is correct
39 Correct 444 ms 4340 KB Output is correct
40 Correct 318 ms 3328 KB Output is correct
41 Correct 410 ms 4292 KB Output is correct
42 Correct 343 ms 3332 KB Output is correct
43 Correct 204 ms 18856 KB Output is correct
44 Correct 241 ms 21360 KB Output is correct
45 Correct 87 ms 2680 KB Output is correct
46 Correct 156 ms 2780 KB Output is correct
47 Correct 1004 ms 108552 KB Output is correct
48 Correct 2031 ms 282356 KB Output is correct
49 Correct 116 ms 4380 KB Output is correct
50 Correct 110 ms 4360 KB Output is correct
51 Correct 108 ms 4492 KB Output is correct
52 Correct 127 ms 4788 KB Output is correct
53 Correct 118 ms 4864 KB Output is correct
54 Correct 122 ms 4760 KB Output is correct