oj.uz

Submission #674874

# Submission time Handle Problem Language Result Execution time Memory
674874 2022-12-26T12:24:27 Z MrBrionix Abracadabra (CEOI22_abracadabra) C++17
100 / 100
 1422 ms 46760 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 278 ms 27212 KB Output is correct
2 Correct 286 ms 26124 KB Output is correct
3 Correct 254 ms 25660 KB Output is correct
4 Correct 262 ms 25580 KB Output is correct
5 Correct 271 ms 28068 KB Output is correct
6 Correct 244 ms 28136 KB Output is correct
7 Correct 311 ms 28612 KB Output is correct
8 Correct 262 ms 27012 KB Output is correct
9 Correct 253 ms 25952 KB Output is correct
10 Correct 252 ms 25676 KB Output is correct
11 Correct 248 ms 26040 KB Output is correct
12 Correct 251 ms 24272 KB Output is correct
13 Correct 249 ms 25068 KB Output is correct
14 Correct 261 ms 27232 KB Output is correct
15 Correct 281 ms 25484 KB Output is correct
16 Correct 3 ms 5036 KB Output is correct
17 Correct 245 ms 24404 KB Output is correct
18 Correct 251 ms 24356 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 647 ms 40780 KB Output is correct
2 Correct 468 ms 40736 KB Output is correct
3 Correct 457 ms 36232 KB Output is correct
4 Correct 443 ms 36488 KB Output is correct
5 Correct 458 ms 37024 KB Output is correct
6 Correct 482 ms 35940 KB Output is correct
7 Correct 458 ms 40600 KB Output is correct
8 Correct 501 ms 39380 KB Output is correct
9 Correct 415 ms 36952 KB Output is correct
10 Correct 419 ms 39176 KB Output is correct
11 Correct 390 ms 36788 KB Output is correct
12 Correct 377 ms 35828 KB Output is correct
13 Correct 399 ms 39356 KB Output is correct
14 Correct 372 ms 36648 KB Output is correct
15 Correct 435 ms 39972 KB Output is correct
16 Correct 115 ms 19340 KB Output is correct
17 Correct 458 ms 39372 KB Output is correct
18 Correct 326 ms 35992 KB Output is correct
19 Correct 189 ms 24024 KB Output is correct
20 Correct 186 ms 24500 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 227 ms 16420 KB Output is correct
2 Correct 195 ms 15468 KB Output is correct
3 Correct 169 ms 15608 KB Output is correct
4 Correct 139 ms 14968 KB Output is correct
5 Correct 209 ms 15320 KB Output is correct
6 Correct 137 ms 15108 KB Output is correct
7 Correct 162 ms 15156 KB Output is correct
8 Correct 177 ms 14848 KB Output is correct
9 Correct 174 ms 15612 KB Output is correct
10 Correct 124 ms 14820 KB Output is correct
11 Correct 132 ms 14832 KB Output is correct
12 Correct 147 ms 14848 KB Output is correct
13 Correct 116 ms 14748 KB Output is correct
14 Correct 118 ms 15160 KB Output is correct
15 Correct 156 ms 14592 KB Output is correct
16 Correct 52 ms 11916 KB Output is correct
17 Correct 107 ms 14052 KB Output is correct
18 Correct 111 ms 14144 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 278 ms 27212 KB Output is correct
2 Correct 286 ms 26124 KB Output is correct
3 Correct 254 ms 25660 KB Output is correct
4 Correct 262 ms 25580 KB Output is correct
5 Correct 271 ms 28068 KB Output is correct
6 Correct 244 ms 28136 KB Output is correct
7 Correct 311 ms 28612 KB Output is correct
8 Correct 262 ms 27012 KB Output is correct
9 Correct 253 ms 25952 KB Output is correct
10 Correct 252 ms 25676 KB Output is correct
11 Correct 248 ms 26040 KB Output is correct
12 Correct 251 ms 24272 KB Output is correct
13 Correct 249 ms 25068 KB Output is correct
14 Correct 261 ms 27232 KB Output is correct
15 Correct 281 ms 25484 KB Output is correct
16 Correct 3 ms 5036 KB Output is correct
17 Correct 245 ms 24404 KB Output is correct
18 Correct 251 ms 24356 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 647 ms 40780 KB Output is correct
22 Correct 468 ms 40736 KB Output is correct
23 Correct 457 ms 36232 KB Output is correct
24 Correct 443 ms 36488 KB Output is correct
25 Correct 458 ms 37024 KB Output is correct
26 Correct 482 ms 35940 KB Output is correct
27 Correct 458 ms 40600 KB Output is correct
28 Correct 501 ms 39380 KB Output is correct
29 Correct 415 ms 36952 KB Output is correct
30 Correct 419 ms 39176 KB Output is correct
31 Correct 390 ms 36788 KB Output is correct
32 Correct 377 ms 35828 KB Output is correct
33 Correct 399 ms 39356 KB Output is correct
34 Correct 372 ms 36648 KB Output is correct
35 Correct 435 ms 39972 KB Output is correct
36 Correct 115 ms 19340 KB Output is correct
37 Correct 458 ms 39372 KB Output is correct
38 Correct 326 ms 35992 KB Output is correct
39 Correct 189 ms 24024 KB Output is correct
40 Correct 186 ms 24500 KB Output is correct
41 Correct 227 ms 16420 KB Output is correct
42 Correct 195 ms 15468 KB Output is correct
43 Correct 169 ms 15608 KB Output is correct
44 Correct 139 ms 14968 KB Output is correct
45 Correct 209 ms 15320 KB Output is correct
46 Correct 137 ms 15108 KB Output is correct
47 Correct 162 ms 15156 KB Output is correct
48 Correct 177 ms 14848 KB Output is correct
49 Correct 174 ms 15612 KB Output is correct
50 Correct 124 ms 14820 KB Output is correct
51 Correct 132 ms 14832 KB Output is correct
52 Correct 147 ms 14848 KB Output is correct
53 Correct 116 ms 14748 KB Output is correct
54 Correct 118 ms 15160 KB Output is correct
55 Correct 156 ms 14592 KB Output is correct
56 Correct 52 ms 11916 KB Output is correct
57 Correct 107 ms 14052 KB Output is correct
58 Correct 111 ms 14144 KB Output is correct
59 Correct 3 ms 4948 KB Output is correct
60 Correct 3 ms 4948 KB Output is correct
61 Correct 1422 ms 46760 KB Output is correct
62 Correct 1276 ms 45032 KB Output is correct
63 Correct 1182 ms 44004 KB Output is correct
64 Correct 1089 ms 43324 KB Output is correct
65 Correct 1187 ms 44332 KB Output is correct
66 Correct 1200 ms 42916 KB Output is correct
67 Correct 1082 ms 42292 KB Output is correct
68 Correct 1063 ms 40800 KB Output is correct
69 Correct 1036 ms 42964 KB Output is correct
70 Correct 938 ms 39940 KB Output is correct
71 Correct 917 ms 41852 KB Output is correct
72 Correct 896 ms 40012 KB Output is correct
73 Correct 931 ms 41008 KB Output is correct
74 Correct 918 ms 42312 KB Output is correct
75 Correct 916 ms 40544 KB Output is correct
76 Correct 119 ms 18944 KB Output is correct
77 Correct 884 ms 37732 KB Output is correct
78 Correct 841 ms 37584 KB Output is correct
79 Correct 2 ms 4948 KB Output is correct
80 Correct 3 ms 4948 KB Output is correct