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Submission #745951

# Submission time Handle Problem Language Result Execution time Memory
745951 2023-05-21T09:59:27 Z MrBrionix Abracadabra (CEOI22_abracadabra) C++17
100 / 100
 1616 ms 53516 KB 
#include<bits/stdc++.h>
using namespace std;
mt19937 rng(time(nullptr));

using T = int;
struct node {
    T val, ma;
    int size;
    size_t prior;
    node *left, *right;

    node(T v) : val(v), ma(v), size(1),
             prior(rng()), left(0), right(0) {}

    node* fix() {
        ma = val, size = 1;
        if (left) {
            ma = max(ma, left->ma);
            size += left->size;
        }
        if (right) {
            ma = max(ma, right->ma);
            size += right->size;
        }
        return this;
    }
};

node* merge(node* a, node* b) {
    if (!a) return b; a->fix();
    if (!b) return a; b->fix();
    if (a->prior > b->prior) {
        a->right = merge(a->right, b);
        return a->fix();
    } else {
        b->left = merge(a, b->left);
        return b->fix();
    }
}

pair<node*, node*> split(node* p, int k) {
    if (!p) return {nullptr, nullptr};
    p->fix();
    int sl = p->left ? p->left->size : 0;
    if (k <= sl) {
        auto [a, b] = split(p->left, k);
        p->left = b;
        return {a, p->fix()};
    } else {
        auto [a, b] = split(p->right, k-sl-1);
        p->right = a;
        return {p->fix(), b};
    }
}

int find_kth(node* p,int pos){
    p->fix();
    int sl = p->left ? p->left->size : 0;
    if (p->left && pos < sl) {
        return find_kth(p->left,pos);
    } else if (p->right && pos > sl) {
        return find_kth(p->right,pos - sl - 1);
    } else {
        return p->val;
    }
}

int find_first(node *p,int val){
    int sl = p->left ? p->left->size : 0;
    if (p->left && p->left->ma > val) {
        return find_first(p->left,val);
    } else if (p->val > val){
		return sl;
	} else if (p->right && p->right->ma > val) {
        return sl + 1 + find_first(p->right,val);
    } else {
        return p->size;
    }
}

node* build(vector<T>& A, int l, int r) {
    if (l + 1 == r) return new node(A[l]);
    int m = (l + r) / 2;
    node* a = build(A, l, m);
    node* b = build(A, m, r);
    return merge(a, b);
}


const int MAXN = 200005, MAXQ = 1000006;
int n,q,ans[MAXQ],tmp[MAXN],cont;
vector<T> v;
vector<pair<int,int> > opz[MAXN];
node* root;

int main(){

	ios::sync_with_stdio(false);
	cin.tie(0);

	cin>>n>>q;
	v.resize(n);
	
	for(int i=0;i<n;i++){
		cin>>v[i];
	}
	
	for(int i=0;i<q;i++){
		int t,x;
		cin>>t>>x;
		opz[min(t,n)].emplace_back(x-1,i);
	}
	root = build(v,0,n);
	
	for(int i=0;i<=n;i++){
		for(auto [a,b] : opz[i]){
			ans[b]=find_kth(root,a);
		}
		
		auto [a,b] = split(root,n/2);
		
		while(b!=nullptr){
			int val = find_kth(b,0);
			
			if(val > a->ma){
				a = merge(a,b);
				break;
			}
			
			int pos1 = find_first(a,val);
			int pos2 = find_first(b,val);
			
			auto [c,d] = split(b,pos2);
			auto [e,f] = split(a,pos1);
			
			a = merge(merge(e,c),f);
			b = d;
			cont++;
		}
		root = a;
	}

	for(int i=0;i<q;i++){
		cout<<ans[i]<<"\n";
	}
	return 0;
}

Compilation message

Main.cpp: In function 'node* merge(node*, node*)':
Main.cpp:30:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   30 |     if (!a) return b; a->fix();
      |     ^~
Main.cpp:30:23: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   30 |     if (!a) return b; a->fix();
      |                       ^
Main.cpp:31:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   31 |     if (!b) return a; b->fix();
      |     ^~
Main.cpp:31:23: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   31 |     if (!b) return a; b->fix();
      |                       ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 304 ms 30744 KB Output is correct
2 Correct 362 ms 29324 KB Output is correct
3 Correct 342 ms 28716 KB Output is correct
4 Correct 306 ms 27476 KB Output is correct
5 Correct 336 ms 31056 KB Output is correct
6 Correct 334 ms 30356 KB Output is correct
7 Correct 304 ms 31604 KB Output is correct
8 Correct 303 ms 29128 KB Output is correct
9 Correct 286 ms 27992 KB Output is correct
10 Correct 298 ms 27844 KB Output is correct
11 Correct 291 ms 28232 KB Output is correct
12 Correct 295 ms 25728 KB Output is correct
13 Correct 308 ms 27076 KB Output is correct
14 Correct 382 ms 29644 KB Output is correct
15 Correct 295 ms 27552 KB Output is correct
16 Correct 3 ms 5032 KB Output is correct
17 Correct 280 ms 25852 KB Output is correct
18 Correct 330 ms 25824 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 738 ms 47712 KB Output is correct
2 Correct 607 ms 46720 KB Output is correct
3 Correct 547 ms 39704 KB Output is correct
4 Correct 474 ms 39844 KB Output is correct
5 Correct 495 ms 40676 KB Output is correct
6 Correct 450 ms 39244 KB Output is correct
7 Correct 592 ms 46596 KB Output is correct
8 Correct 522 ms 44852 KB Output is correct
9 Correct 552 ms 40472 KB Output is correct
10 Correct 474 ms 43760 KB Output is correct
11 Correct 374 ms 38908 KB Output is correct
12 Correct 416 ms 38440 KB Output is correct
13 Correct 460 ms 43124 KB Output is correct
14 Correct 397 ms 39564 KB Output is correct
15 Correct 530 ms 44776 KB Output is correct
16 Correct 154 ms 16276 KB Output is correct
17 Correct 763 ms 41320 KB Output is correct
18 Correct 407 ms 36548 KB Output is correct
19 Correct 149 ms 21344 KB Output is correct
20 Correct 210 ms 22708 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 234 ms 14928 KB Output is correct
2 Correct 157 ms 14284 KB Output is correct
3 Correct 167 ms 14204 KB Output is correct
4 Correct 143 ms 13712 KB Output is correct
5 Correct 212 ms 14432 KB Output is correct
6 Correct 129 ms 13676 KB Output is correct
7 Correct 181 ms 14304 KB Output is correct
8 Correct 144 ms 13728 KB Output is correct
9 Correct 172 ms 14156 KB Output is correct
10 Correct 108 ms 13432 KB Output is correct
11 Correct 122 ms 13704 KB Output is correct
12 Correct 115 ms 13528 KB Output is correct
13 Correct 142 ms 13360 KB Output is correct
14 Correct 122 ms 13756 KB Output is correct
15 Correct 122 ms 13404 KB Output is correct
16 Correct 73 ms 10616 KB Output is correct
17 Correct 165 ms 12972 KB Output is correct
18 Correct 112 ms 12932 KB Output is correct
19 Correct 3 ms 5032 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 304 ms 30744 KB Output is correct
2 Correct 362 ms 29324 KB Output is correct
3 Correct 342 ms 28716 KB Output is correct
4 Correct 306 ms 27476 KB Output is correct
5 Correct 336 ms 31056 KB Output is correct
6 Correct 334 ms 30356 KB Output is correct
7 Correct 304 ms 31604 KB Output is correct
8 Correct 303 ms 29128 KB Output is correct
9 Correct 286 ms 27992 KB Output is correct
10 Correct 298 ms 27844 KB Output is correct
11 Correct 291 ms 28232 KB Output is correct
12 Correct 295 ms 25728 KB Output is correct
13 Correct 308 ms 27076 KB Output is correct
14 Correct 382 ms 29644 KB Output is correct
15 Correct 295 ms 27552 KB Output is correct
16 Correct 3 ms 5032 KB Output is correct
17 Correct 280 ms 25852 KB Output is correct
18 Correct 330 ms 25824 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 738 ms 47712 KB Output is correct
22 Correct 607 ms 46720 KB Output is correct
23 Correct 547 ms 39704 KB Output is correct
24 Correct 474 ms 39844 KB Output is correct
25 Correct 495 ms 40676 KB Output is correct
26 Correct 450 ms 39244 KB Output is correct
27 Correct 592 ms 46596 KB Output is correct
28 Correct 522 ms 44852 KB Output is correct
29 Correct 552 ms 40472 KB Output is correct
30 Correct 474 ms 43760 KB Output is correct
31 Correct 374 ms 38908 KB Output is correct
32 Correct 416 ms 38440 KB Output is correct
33 Correct 460 ms 43124 KB Output is correct
34 Correct 397 ms 39564 KB Output is correct
35 Correct 530 ms 44776 KB Output is correct
36 Correct 154 ms 16276 KB Output is correct
37 Correct 763 ms 41320 KB Output is correct
38 Correct 407 ms 36548 KB Output is correct
39 Correct 149 ms 21344 KB Output is correct
40 Correct 210 ms 22708 KB Output is correct
41 Correct 234 ms 14928 KB Output is correct
42 Correct 157 ms 14284 KB Output is correct
43 Correct 167 ms 14204 KB Output is correct
44 Correct 143 ms 13712 KB Output is correct
45 Correct 212 ms 14432 KB Output is correct
46 Correct 129 ms 13676 KB Output is correct
47 Correct 181 ms 14304 KB Output is correct
48 Correct 144 ms 13728 KB Output is correct
49 Correct 172 ms 14156 KB Output is correct
50 Correct 108 ms 13432 KB Output is correct
51 Correct 122 ms 13704 KB Output is correct
52 Correct 115 ms 13528 KB Output is correct
53 Correct 142 ms 13360 KB Output is correct
54 Correct 122 ms 13756 KB Output is correct
55 Correct 122 ms 13404 KB Output is correct
56 Correct 73 ms 10616 KB Output is correct
57 Correct 165 ms 12972 KB Output is correct
58 Correct 112 ms 12932 KB Output is correct
59 Correct 3 ms 5032 KB Output is correct
60 Correct 3 ms 4948 KB Output is correct
61 Correct 1616 ms 53516 KB Output is correct
62 Correct 1086 ms 51068 KB Output is correct
63 Correct 1111 ms 49840 KB Output is correct
64 Correct 1085 ms 49276 KB Output is correct
65 Correct 1056 ms 50988 KB Output is correct
66 Correct 1148 ms 49156 KB Output is correct
67 Correct 1006 ms 48844 KB Output is correct
68 Correct 929 ms 46988 KB Output is correct
69 Correct 974 ms 49356 KB Output is correct
70 Correct 829 ms 45828 KB Output is correct
71 Correct 802 ms 46684 KB Output is correct
72 Correct 967 ms 45836 KB Output is correct
73 Correct 962 ms 46528 KB Output is correct
74 Correct 1132 ms 48868 KB Output is correct
75 Correct 903 ms 46932 KB Output is correct
76 Correct 112 ms 16276 KB Output is correct
77 Correct 683 ms 41664 KB Output is correct
78 Correct 682 ms 41444 KB Output is correct
79 Correct 3 ms 4948 KB Output is correct
80 Correct 3 ms 4948 KB Output is correct