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Submission #643733

# Submission time Handle Problem Language Result Execution time Memory
643733 2022-09-22T19:45:40 Z kingfran1907 Abracadabra (CEOI22_abracadabra) C++14
100 / 100
 891 ms 69600 KB 
#include <bits/stdc++.h>
#define X first
#define Y second

using namespace std;
typedef long long llint;

const int maxn = 1e6+10;
const int base = 31337;
const int mod = 1e9+7;
const int inf = 0x3f3f3f3f;
const int logo = 20;
const int off = 1 << logo;
const int treesiz = off << 1;

int n, q;
int niz[maxn];
int pos[maxn];
int t[maxn], p[maxn];
vector< int > qs[maxn];
int sol[maxn];
int tour[treesiz];
int l[maxn], r[maxn];

void update(int x, int val) {
	x += off;
	tour[x] = val;

	x /= 2;
	while (x > 0) tour[x] = tour[x * 2] + tour[x * 2 + 1], x /= 2;
}

int fin(int l, int r, int node, int val) {
	if (l == r) return l;

	int mid = (l + r) / 2;
	if (tour[node * 2] >= val) return fin(l, mid, node * 2, val);
	return fin(mid + 1, r, node * 2 + 1, val - tour[node * 2]);
}

int query(int a, int b, int l, int r, int node) {
	if (l > b || r < a) return 0;
	if (l >= a && r <= b) return tour[node];

	int mid = (l + r) / 2;
	return query(a, b, l, mid, node * 2) + query(a, b, mid + 1, r, node * 2 + 1);
}

int main() {
	scanf("%d%d", &n, &q);
	for (int i = 0; i < n; i++) 
		scanf("%d", niz+i);

	for (int i = 0; i < q; i++) {
		scanf("%d%d", t+i, p+i);
		t[i] = min(t[i], n); p[i]--;
		qs[t[i]].push_back(i);
	}

	niz[n] = inf;
	stack< int > s; s.push(n);
	for (int i = n - 1; i >= 0; i--) {
		while (niz[s.top()] < niz[i]) s.pop();
		pos[i] = s.top();
		s.push(i);
	}

	for (int tren : qs[0]) sol[tren] = niz[p[tren]];
	
	int ptr = 0;
	memset(r, -1, sizeof r);
	while (ptr < n) {
		int val = niz[ptr];
		l[val] = ptr;
		r[val] = pos[ptr] - 1;
		update(val, r[val] - l[val] + 1);
		//printf("block: %d (%d %d)\n", val, l[val], r[val]);

		ptr = pos[ptr];
	}

	update(n + 1, 100);
	for (int ac = 1; ac <= n; ac++) {
		int ind = fin(0, off - 1, 1, n / 2 + 1);
		//printf("ind: %d\n", ind);
		assert(query(1, n, 0, off - 1, 1) == n);
		int prev = query(0, ind - 1, 0, off - 1, 1);
		//printf("middle: %d --> %d\n", ind, prev);
		if (prev != n / 2) {
			int ptr = l[ind] + n / 2 - prev;
			int cp = ptr;
			//printf("ptr: %d\n", ptr);

			while (ptr <= r[ind]) {
				//printf("current ptr: %d\n", ptr);
				int val = niz[ptr];
				l[val] = ptr, r[val] = min(pos[ptr], r[ind] + 1) - 1;
				update(val, r[val] - l[val] + 1);
				//printf("block: %d (%d %d)\n", val, l[val], r[val]);
				ptr = pos[ptr];
			}
			r[ind] = cp - 1;
			update(ind, r[ind] - l[ind] + 1);
			//printf("reduce block: %d --> %d %d\n", ind, l[ind], r[ind]);
		}

		for (int tren : qs[ac]) {
			//printf("answering: %d\n", tren + 1);
			int ind = fin(0, off - 1, 1, p[tren] + 1);
			//assert(ind <= n);
			//printf("in block: %d (%d %d)\n", ind, l[ind], r[ind]);
			//assert(r[ind] - l[ind] >= 0);
			int prev = query(0, ind - 1, 0, off - 1, 1);
			//printf("prev size: %d\n", prev);
			sol[tren] = niz[l[ind] + p[tren] - prev];
		}
	}

	for (int i = 0; i < q; i++) 
		printf("%d\n", sol[i]);
	return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |   scanf("%d", niz+i);
      |   ~~~~~^~~~~~~~~~~~~
Main.cpp:55:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |   scanf("%d%d", t+i, p+i);
      |   ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 434 ms 49560 KB Output is correct
2 Correct 434 ms 51624 KB Output is correct
3 Correct 410 ms 50856 KB Output is correct
4 Correct 345 ms 53308 KB Output is correct
5 Correct 440 ms 54572 KB Output is correct
6 Correct 354 ms 54360 KB Output is correct
7 Correct 418 ms 54232 KB Output is correct
8 Correct 367 ms 52980 KB Output is correct
9 Correct 356 ms 53336 KB Output is correct
10 Correct 358 ms 52144 KB Output is correct
11 Correct 381 ms 52132 KB Output is correct
12 Correct 332 ms 51076 KB Output is correct
13 Correct 339 ms 51760 KB Output is correct
14 Correct 404 ms 54204 KB Output is correct
15 Correct 361 ms 53844 KB Output is correct
16 Correct 14 ms 27732 KB Output is correct
17 Correct 265 ms 52112 KB Output is correct
18 Correct 278 ms 51976 KB Output is correct
19 Correct 16 ms 27732 KB Output is correct
20 Correct 15 ms 27728 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 508 ms 57412 KB Output is correct
2 Correct 495 ms 67128 KB Output is correct
3 Correct 412 ms 59620 KB Output is correct
4 Correct 385 ms 57008 KB Output is correct
5 Correct 400 ms 57640 KB Output is correct
6 Correct 390 ms 58596 KB Output is correct
7 Correct 456 ms 61972 KB Output is correct
8 Correct 469 ms 63288 KB Output is correct
9 Correct 440 ms 57132 KB Output is correct
10 Correct 417 ms 61484 KB Output is correct
11 Correct 354 ms 55256 KB Output is correct
12 Correct 371 ms 54552 KB Output is correct
13 Correct 420 ms 61332 KB Output is correct
14 Correct 367 ms 59140 KB Output is correct
15 Correct 434 ms 64904 KB Output is correct
16 Correct 88 ms 32744 KB Output is correct
17 Correct 326 ms 60188 KB Output is correct
18 Correct 345 ms 51432 KB Output is correct
19 Correct 137 ms 37980 KB Output is correct
20 Correct 164 ms 38900 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 131 ms 33672 KB Output is correct
2 Correct 116 ms 32988 KB Output is correct
3 Correct 118 ms 33028 KB Output is correct
4 Correct 97 ms 32304 KB Output is correct
5 Correct 107 ms 32860 KB Output is correct
6 Correct 94 ms 32332 KB Output is correct
7 Correct 97 ms 32656 KB Output is correct
8 Correct 101 ms 32312 KB Output is correct
9 Correct 108 ms 32504 KB Output is correct
10 Correct 88 ms 32128 KB Output is correct
11 Correct 89 ms 32168 KB Output is correct
12 Correct 86 ms 32076 KB Output is correct
13 Correct 89 ms 31988 KB Output is correct
14 Correct 86 ms 32204 KB Output is correct
15 Correct 88 ms 31964 KB Output is correct
16 Correct 49 ms 29748 KB Output is correct
17 Correct 77 ms 32188 KB Output is correct
18 Correct 74 ms 30880 KB Output is correct
19 Correct 13 ms 27732 KB Output is correct
20 Correct 16 ms 27776 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 434 ms 49560 KB Output is correct
2 Correct 434 ms 51624 KB Output is correct
3 Correct 410 ms 50856 KB Output is correct
4 Correct 345 ms 53308 KB Output is correct
5 Correct 440 ms 54572 KB Output is correct
6 Correct 354 ms 54360 KB Output is correct
7 Correct 418 ms 54232 KB Output is correct
8 Correct 367 ms 52980 KB Output is correct
9 Correct 356 ms 53336 KB Output is correct
10 Correct 358 ms 52144 KB Output is correct
11 Correct 381 ms 52132 KB Output is correct
12 Correct 332 ms 51076 KB Output is correct
13 Correct 339 ms 51760 KB Output is correct
14 Correct 404 ms 54204 KB Output is correct
15 Correct 361 ms 53844 KB Output is correct
16 Correct 14 ms 27732 KB Output is correct
17 Correct 265 ms 52112 KB Output is correct
18 Correct 278 ms 51976 KB Output is correct
19 Correct 16 ms 27732 KB Output is correct
20 Correct 15 ms 27728 KB Output is correct
21 Correct 508 ms 57412 KB Output is correct
22 Correct 495 ms 67128 KB Output is correct
23 Correct 412 ms 59620 KB Output is correct
24 Correct 385 ms 57008 KB Output is correct
25 Correct 400 ms 57640 KB Output is correct
26 Correct 390 ms 58596 KB Output is correct
27 Correct 456 ms 61972 KB Output is correct
28 Correct 469 ms 63288 KB Output is correct
29 Correct 440 ms 57132 KB Output is correct
30 Correct 417 ms 61484 KB Output is correct
31 Correct 354 ms 55256 KB Output is correct
32 Correct 371 ms 54552 KB Output is correct
33 Correct 420 ms 61332 KB Output is correct
34 Correct 367 ms 59140 KB Output is correct
35 Correct 434 ms 64904 KB Output is correct
36 Correct 88 ms 32744 KB Output is correct
37 Correct 326 ms 60188 KB Output is correct
38 Correct 345 ms 51432 KB Output is correct
39 Correct 137 ms 37980 KB Output is correct
40 Correct 164 ms 38900 KB Output is correct
41 Correct 131 ms 33672 KB Output is correct
42 Correct 116 ms 32988 KB Output is correct
43 Correct 118 ms 33028 KB Output is correct
44 Correct 97 ms 32304 KB Output is correct
45 Correct 107 ms 32860 KB Output is correct
46 Correct 94 ms 32332 KB Output is correct
47 Correct 97 ms 32656 KB Output is correct
48 Correct 101 ms 32312 KB Output is correct
49 Correct 108 ms 32504 KB Output is correct
50 Correct 88 ms 32128 KB Output is correct
51 Correct 89 ms 32168 KB Output is correct
52 Correct 86 ms 32076 KB Output is correct
53 Correct 89 ms 31988 KB Output is correct
54 Correct 86 ms 32204 KB Output is correct
55 Correct 88 ms 31964 KB Output is correct
56 Correct 49 ms 29748 KB Output is correct
57 Correct 77 ms 32188 KB Output is correct
58 Correct 74 ms 30880 KB Output is correct
59 Correct 13 ms 27732 KB Output is correct
60 Correct 16 ms 27776 KB Output is correct
61 Correct 891 ms 69600 KB Output is correct
62 Correct 840 ms 68412 KB Output is correct
63 Correct 849 ms 65596 KB Output is correct
64 Correct 648 ms 64684 KB Output is correct
65 Correct 681 ms 67852 KB Output is correct
66 Correct 648 ms 65300 KB Output is correct
67 Correct 613 ms 65396 KB Output is correct
68 Correct 658 ms 64660 KB Output is correct
69 Correct 680 ms 64444 KB Output is correct
70 Correct 607 ms 63568 KB Output is correct
71 Correct 615 ms 64408 KB Output is correct
72 Correct 608 ms 61600 KB Output is correct
73 Correct 605 ms 62328 KB Output is correct
74 Correct 595 ms 64668 KB Output is correct
75 Correct 617 ms 62632 KB Output is correct
76 Correct 90 ms 32124 KB Output is correct
77 Correct 364 ms 59212 KB Output is correct
78 Correct 408 ms 57664 KB Output is correct
79 Correct 17 ms 27716 KB Output is correct
80 Correct 15 ms 27772 KB Output is correct