oj.uz

Submission #674873

# Submission time Handle Problem Language Result Execution time Memory
674873 2022-12-26T12:22:33 Z MrBrionix Abracadabra (CEOI22_abracadabra) C++17
100 / 100
 1347 ms 50652 KB 
#include<bits/stdc++.h>
using namespace std;
mt19937 rng(0);//rng(time(nullptr));

using T = int;
struct node {
    T val, ma;
    int size;
    size_t prior;
    node *left, *right;
	//node *par=nullptr; bool isleft=0; se serve get_pos
  
    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) {
        auto tmp = merge(a->right, b);
        a->right = tmp;
        //if(tmp)tmp->par = a, tmp->isleft = 0; se serve get_pos
        return a->fix();
    } else {
        auto tmp = merge(a, b->left);
        b->left = tmp;
        //if(tmp)tmp->par = b, tmp->isleft = 1; se serve get_pos
        return b->fix();
    }
}
//taglio subito dopo k elementi (1-based)
//es. k=1, divido il primo elemento dagli altri
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);
        //if(a) a->par = nullptr, a->isleft=0; se serve get_pos
        p->left = b;
        //if(b) b->par = p, b->isleft = 1; se serve get_pos
        return {a, p->fix()};
    } else {
        auto [a, b] = split(p->right, k-sl-1);
        //if(b) b->par = nullptr, b->isleft=0; se serve get_pos
        p->right = a;
        //if(a) a->par = p, a->isleft = 0; se serve get_pos
        return {p->fix(), b};
    }//invariante: sui due nodi di ritorno
}    //è sempre stata chiamata ->fix()

int find_kth(node* p,int pos){
    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:31:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   31 |     if (!a) return b; a->fix();
      |     ^~
Main.cpp:31:23: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   31 |     if (!a) return b; a->fix();
      |                       ^
Main.cpp:32:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   32 |     if (!b) return a; b->fix();
      |     ^~
Main.cpp:32:23: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   32 |     if (!b) return a; b->fix();
      |                       ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 271 ms 28052 KB Output is correct
2 Correct 263 ms 27680 KB Output is correct
3 Correct 267 ms 26956 KB Output is correct
4 Correct 244 ms 27380 KB Output is correct
5 Correct 281 ms 29900 KB Output is correct
6 Correct 244 ms 29648 KB Output is correct
7 Correct 261 ms 29516 KB Output is correct
8 Correct 246 ms 27896 KB Output is correct
9 Correct 244 ms 27112 KB Output is correct
10 Correct 253 ms 27084 KB Output is correct
11 Correct 248 ms 26828 KB Output is correct
12 Correct 234 ms 24692 KB Output is correct
13 Correct 254 ms 25580 KB Output is correct
14 Correct 249 ms 29452 KB Output is correct
15 Correct 257 ms 27560 KB Output is correct
16 Correct 3 ms 5076 KB Output is correct
17 Correct 239 ms 25624 KB Output is correct
18 Correct 240 ms 25404 KB Output is correct
19 Correct 2 ms 5076 KB Output is correct
20 Correct 2 ms 5036 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 597 ms 47356 KB Output is correct
2 Correct 459 ms 46244 KB Output is correct
3 Correct 423 ms 39556 KB Output is correct
4 Correct 419 ms 37740 KB Output is correct
5 Correct 433 ms 38452 KB Output is correct
6 Correct 454 ms 38784 KB Output is correct
7 Correct 447 ms 42416 KB Output is correct
8 Correct 456 ms 43076 KB Output is correct
9 Correct 390 ms 38076 KB Output is correct
10 Correct 412 ms 41648 KB Output is correct
11 Correct 348 ms 36400 KB Output is correct
12 Correct 369 ms 35820 KB Output is correct
13 Correct 401 ms 41376 KB Output is correct
14 Correct 368 ms 39284 KB Output is correct
15 Correct 412 ms 44256 KB Output is correct
16 Correct 106 ms 16140 KB Output is correct
17 Correct 416 ms 39472 KB Output is correct
18 Correct 313 ms 34336 KB Output is correct
19 Correct 190 ms 20888 KB Output is correct
20 Correct 184 ms 21572 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 205 ms 14872 KB Output is correct
2 Correct 164 ms 13908 KB Output is correct
3 Correct 163 ms 14100 KB Output is correct
4 Correct 126 ms 13388 KB Output is correct
5 Correct 195 ms 13820 KB Output is correct
6 Correct 126 ms 13544 KB Output is correct
7 Correct 157 ms 13572 KB Output is correct
8 Correct 144 ms 13260 KB Output is correct
9 Correct 154 ms 14024 KB Output is correct
10 Correct 117 ms 13332 KB Output is correct
11 Correct 101 ms 13132 KB Output is correct
12 Correct 130 ms 13388 KB Output is correct
13 Correct 104 ms 13244 KB Output is correct
14 Correct 111 ms 13560 KB Output is correct
15 Correct 110 ms 13004 KB Output is correct
16 Correct 51 ms 10444 KB Output is correct
17 Correct 103 ms 12488 KB Output is correct
18 Correct 108 ms 12756 KB Output is correct
19 Correct 3 ms 4948 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 271 ms 28052 KB Output is correct
2 Correct 263 ms 27680 KB Output is correct
3 Correct 267 ms 26956 KB Output is correct
4 Correct 244 ms 27380 KB Output is correct
5 Correct 281 ms 29900 KB Output is correct
6 Correct 244 ms 29648 KB Output is correct
7 Correct 261 ms 29516 KB Output is correct
8 Correct 246 ms 27896 KB Output is correct
9 Correct 244 ms 27112 KB Output is correct
10 Correct 253 ms 27084 KB Output is correct
11 Correct 248 ms 26828 KB Output is correct
12 Correct 234 ms 24692 KB Output is correct
13 Correct 254 ms 25580 KB Output is correct
14 Correct 249 ms 29452 KB Output is correct
15 Correct 257 ms 27560 KB Output is correct
16 Correct 3 ms 5076 KB Output is correct
17 Correct 239 ms 25624 KB Output is correct
18 Correct 240 ms 25404 KB Output is correct
19 Correct 2 ms 5076 KB Output is correct
20 Correct 2 ms 5036 KB Output is correct
21 Correct 597 ms 47356 KB Output is correct
22 Correct 459 ms 46244 KB Output is correct
23 Correct 423 ms 39556 KB Output is correct
24 Correct 419 ms 37740 KB Output is correct
25 Correct 433 ms 38452 KB Output is correct
26 Correct 454 ms 38784 KB Output is correct
27 Correct 447 ms 42416 KB Output is correct
28 Correct 456 ms 43076 KB Output is correct
29 Correct 390 ms 38076 KB Output is correct
30 Correct 412 ms 41648 KB Output is correct
31 Correct 348 ms 36400 KB Output is correct
32 Correct 369 ms 35820 KB Output is correct
33 Correct 401 ms 41376 KB Output is correct
34 Correct 368 ms 39284 KB Output is correct
35 Correct 412 ms 44256 KB Output is correct
36 Correct 106 ms 16140 KB Output is correct
37 Correct 416 ms 39472 KB Output is correct
38 Correct 313 ms 34336 KB Output is correct
39 Correct 190 ms 20888 KB Output is correct
40 Correct 184 ms 21572 KB Output is correct
41 Correct 205 ms 14872 KB Output is correct
42 Correct 164 ms 13908 KB Output is correct
43 Correct 163 ms 14100 KB Output is correct
44 Correct 126 ms 13388 KB Output is correct
45 Correct 195 ms 13820 KB Output is correct
46 Correct 126 ms 13544 KB Output is correct
47 Correct 157 ms 13572 KB Output is correct
48 Correct 144 ms 13260 KB Output is correct
49 Correct 154 ms 14024 KB Output is correct
50 Correct 117 ms 13332 KB Output is correct
51 Correct 101 ms 13132 KB Output is correct
52 Correct 130 ms 13388 KB Output is correct
53 Correct 104 ms 13244 KB Output is correct
54 Correct 111 ms 13560 KB Output is correct
55 Correct 110 ms 13004 KB Output is correct
56 Correct 51 ms 10444 KB Output is correct
57 Correct 103 ms 12488 KB Output is correct
58 Correct 108 ms 12756 KB Output is correct
59 Correct 3 ms 4948 KB Output is correct
60 Correct 3 ms 4948 KB Output is correct
61 Correct 1347 ms 50652 KB Output is correct
62 Correct 1033 ms 49076 KB Output is correct
63 Correct 1086 ms 46636 KB Output is correct
64 Correct 987 ms 46452 KB Output is correct
65 Correct 1093 ms 49100 KB Output is correct
66 Correct 1066 ms 46296 KB Output is correct
67 Correct 930 ms 46028 KB Output is correct
68 Correct 914 ms 45076 KB Output is correct
69 Correct 953 ms 46420 KB Output is correct
70 Correct 801 ms 44084 KB Output is correct
71 Correct 759 ms 45108 KB Output is correct
72 Correct 839 ms 42700 KB Output is correct
73 Correct 773 ms 43680 KB Output is correct
74 Correct 854 ms 46480 KB Output is correct
75 Correct 821 ms 43392 KB Output is correct
76 Correct 105 ms 15784 KB Output is correct
77 Correct 750 ms 38804 KB Output is correct
78 Correct 668 ms 39720 KB Output is correct
79 Correct 3 ms 4948 KB Output is correct
80 Correct 3 ms 5028 KB Output is correct