Submission #295735

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
295735	2020-09-09T21:00:29 Z	shayan_p	Ancient Books (IOI17_books)	C++17	50 / 100	680 ms	86500 KB

books

// Oh damn! Suddenly you're free to fly...
 
#include<bits/stdc++.h>
#include "books.h"
 
#define F first
#define S second
#define PB push_back
#define sz(s) int((s).size())
#define bit(n,k) (((n)>>(k))&1)
 
using namespace std;
 
typedef long long ll;
typedef pair<int,int> pii;
 
const int maxn = 1e6 + 10, mod = 1e9 + 7, inf = 1e9 + 10;
 
int pr[maxn], L[maxn], R[maxn];

int fnd(int u){
    return pr[u] < 0 ? u : pr[u] = fnd(pr[u]);
}
void mrg(int a, int b){
    if( (a = fnd(a)) == (b = fnd(b)) )
	return;
    if(pr[a] > pr[b])
	swap(a, b);
    L[a] = min(L[a], L[b]);
    R[a] = max(R[a], R[b]);
    pr[a]+= pr[b];
    pr[b] = a;	    
}
 
ll minimum_walk(vector<int> p, int s){
    memset(pr, -1, sizeof pr);
    
    iota(L, L + maxn, 0);
    iota(R, R + maxn, 0);
    
    int n = sz(p);
    ll ans = 0;
 
    for(int i = 0; i < n; i++){
	int l = i, r = p[i];
	if(l > r)
	    swap(l, r);
	ans+= r-l;
	mrg(l, r);
    }
    vector<int> vec;
    for(int i = 0; i < n; i++){
	if(fnd(i) == i)
	    vec.PB(i);
    }
    sort(vec.begin(), vec.end(), [&](int i, int j){ return L[fnd(i)] > L[fnd(j)]; });
    map<pii, int> segs;
    
    for(int id : vec){
	int pos = R[fnd(id)];
	while(true){
	    auto it = segs.upper_bound({pos, inf});
	    if(it == segs.begin())
		break;
	    --it;
	    if(pos <= (it->F.S)){
		mrg(id, it->S);
		segs.erase(it);
	    }
	    else{
		break;
	    }
	}
	segs[{L[fnd(id)], R[fnd(id)]}] = id;
    }
    
    int l = s, r = s;
    while(true){
	while(true){
	    bool is = 0;
	    while(r < R[fnd(s)])
		mrg(s, ++r), is = 1;
	    while(l > L[fnd(s)])
		mrg(s, --l), is = 1;
	    if(!is)
		break;
	}
	int d1 = 0, d2 = 0;
	while(r < n && L[fnd(s)] <= L[fnd(r)]){
	    d2+= R[fnd(s)] < r;
	    mrg(s, r);
	    r++;
	}
	while(l >= 0 && R[fnd(l)] <= R[fnd(s)]){
	    d1+= L[fnd(s)] > l;
	    mrg(s, l);
	    l--;
	}
	if(l == -1 || r == n){
	    assert(l == -1 && r == n);
	    ans+= 2 * (d1 + d2);
	    break;
	}
	else{
	    ans+= 2 * min(d1 + 1, d2 + 1);
	    assert(fnd(l) == fnd(r));
	    mrg(s, l);
	    mrg(s, r);
	}	    
    }
    for(int i = 0; i < s && p[i] == i; i++){
	ans-= 2;
    }
    for(int i = n-1; i > s && p[i] == i; i--){
	ans-= 2;
    }
    return ans;
}

Subtask #1

12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	8 ms	12032 KB	Output is correct
2	Correct	8 ms	12032 KB	Output is correct
3	Correct	8 ms	12032 KB	Output is correct
4	Correct	9 ms	12032 KB	Output is correct
5	Correct	8 ms	12032 KB	Output is correct
6	Correct	8 ms	12032 KB	Output is correct
7	Correct	8 ms	12032 KB	Output is correct
8	Correct	8 ms	12032 KB	Output is correct
9	Correct	8 ms	12032 KB	Output is correct
10	Correct	8 ms	12032 KB	Output is correct
11	Correct	8 ms	12032 KB	Output is correct
12	Correct	8 ms	12032 KB	Output is correct
13	Correct	8 ms	12032 KB	Output is correct
14	Correct	8 ms	12032 KB	Output is correct
15	Correct	8 ms	12032 KB	Output is correct
16	Correct	8 ms	12032 KB	Output is correct
17	Correct	9 ms	12032 KB	Output is correct
18	Correct	8 ms	12032 KB	Output is correct

Subtask #2

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	8 ms	12032 KB	Output is correct
2	Correct	8 ms	12032 KB	Output is correct
3	Correct	8 ms	12032 KB	Output is correct
4	Correct	9 ms	12032 KB	Output is correct
5	Correct	8 ms	12032 KB	Output is correct
6	Correct	8 ms	12032 KB	Output is correct
7	Correct	8 ms	12032 KB	Output is correct
8	Correct	8 ms	12032 KB	Output is correct
9	Correct	8 ms	12032 KB	Output is correct
10	Correct	8 ms	12032 KB	Output is correct
11	Correct	8 ms	12032 KB	Output is correct
12	Correct	8 ms	12032 KB	Output is correct
13	Correct	8 ms	12032 KB	Output is correct
14	Correct	8 ms	12032 KB	Output is correct
15	Correct	8 ms	12032 KB	Output is correct
16	Correct	8 ms	12032 KB	Output is correct
17	Correct	9 ms	12032 KB	Output is correct
18	Correct	8 ms	12032 KB	Output is correct
19	Correct	8 ms	12032 KB	Output is correct
20	Correct	9 ms	12032 KB	Output is correct
21	Correct	9 ms	12160 KB	Output is correct
22	Correct	9 ms	12160 KB	Output is correct
23	Correct	8 ms	12160 KB	Output is correct
24	Correct	8 ms	12032 KB	Output is correct
25	Correct	8 ms	12032 KB	Output is correct
26	Correct	8 ms	12032 KB	Output is correct
27	Correct	8 ms	12032 KB	Output is correct
28	Correct	8 ms	12032 KB	Output is correct
29	Correct	8 ms	12160 KB	Output is correct

Subtask #3

28.0 / 28.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	8 ms	12032 KB	Output is correct
2	Correct	8 ms	12032 KB	Output is correct
3	Correct	8 ms	12032 KB	Output is correct
4	Correct	9 ms	12032 KB	Output is correct
5	Correct	8 ms	12032 KB	Output is correct
6	Correct	8 ms	12032 KB	Output is correct
7	Correct	8 ms	12032 KB	Output is correct
8	Correct	8 ms	12032 KB	Output is correct
9	Correct	8 ms	12032 KB	Output is correct
10	Correct	8 ms	12032 KB	Output is correct
11	Correct	8 ms	12032 KB	Output is correct
12	Correct	8 ms	12032 KB	Output is correct
13	Correct	8 ms	12032 KB	Output is correct
14	Correct	8 ms	12032 KB	Output is correct
15	Correct	8 ms	12032 KB	Output is correct
16	Correct	8 ms	12032 KB	Output is correct
17	Correct	9 ms	12032 KB	Output is correct
18	Correct	8 ms	12032 KB	Output is correct
19	Correct	8 ms	12032 KB	Output is correct
20	Correct	9 ms	12032 KB	Output is correct
21	Correct	9 ms	12160 KB	Output is correct
22	Correct	9 ms	12160 KB	Output is correct
23	Correct	8 ms	12160 KB	Output is correct
24	Correct	8 ms	12032 KB	Output is correct
25	Correct	8 ms	12032 KB	Output is correct
26	Correct	8 ms	12032 KB	Output is correct
27	Correct	8 ms	12032 KB	Output is correct
28	Correct	8 ms	12032 KB	Output is correct
29	Correct	8 ms	12160 KB	Output is correct
30	Correct	293 ms	19960 KB	Output is correct
31	Correct	320 ms	19904 KB	Output is correct
32	Correct	680 ms	86500 KB	Output is correct
33	Correct	534 ms	65504 KB	Output is correct
34	Correct	525 ms	65760 KB	Output is correct
35	Correct	444 ms	55540 KB	Output is correct
36	Correct	305 ms	35564 KB	Output is correct
37	Correct	230 ms	21876 KB	Output is correct
38	Correct	220 ms	20344 KB	Output is correct
39	Correct	220 ms	20216 KB	Output is correct
40	Correct	222 ms	19960 KB	Output is correct
41	Correct	247 ms	19960 KB	Output is correct
42	Correct	237 ms	19832 KB	Output is correct
43	Correct	601 ms	69216 KB	Output is correct

Subtask #4

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	8 ms	12160 KB	Output is correct
2	Runtime error	24 ms	24320 KB	Execution killed with signal 11
3	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	8 ms	12032 KB	Output is correct
2	Correct	8 ms	12032 KB	Output is correct
3	Correct	8 ms	12032 KB	Output is correct
4	Correct	9 ms	12032 KB	Output is correct
5	Correct	8 ms	12032 KB	Output is correct
6	Correct	8 ms	12032 KB	Output is correct
7	Correct	8 ms	12032 KB	Output is correct
8	Correct	8 ms	12032 KB	Output is correct
9	Correct	8 ms	12032 KB	Output is correct
10	Correct	8 ms	12032 KB	Output is correct
11	Correct	8 ms	12032 KB	Output is correct
12	Correct	8 ms	12032 KB	Output is correct
13	Correct	8 ms	12032 KB	Output is correct
14	Correct	8 ms	12032 KB	Output is correct
15	Correct	8 ms	12032 KB	Output is correct
16	Correct	8 ms	12032 KB	Output is correct
17	Correct	9 ms	12032 KB	Output is correct
18	Correct	8 ms	12032 KB	Output is correct
19	Correct	8 ms	12032 KB	Output is correct
20	Correct	9 ms	12032 KB	Output is correct
21	Correct	9 ms	12160 KB	Output is correct
22	Correct	9 ms	12160 KB	Output is correct
23	Correct	8 ms	12160 KB	Output is correct
24	Correct	8 ms	12032 KB	Output is correct
25	Correct	8 ms	12032 KB	Output is correct
26	Correct	8 ms	12032 KB	Output is correct
27	Correct	8 ms	12032 KB	Output is correct
28	Correct	8 ms	12032 KB	Output is correct
29	Correct	8 ms	12160 KB	Output is correct
30	Correct	293 ms	19960 KB	Output is correct
31	Correct	320 ms	19904 KB	Output is correct
32	Correct	680 ms	86500 KB	Output is correct
33	Correct	534 ms	65504 KB	Output is correct
34	Correct	525 ms	65760 KB	Output is correct
35	Correct	444 ms	55540 KB	Output is correct
36	Correct	305 ms	35564 KB	Output is correct
37	Correct	230 ms	21876 KB	Output is correct
38	Correct	220 ms	20344 KB	Output is correct
39	Correct	220 ms	20216 KB	Output is correct
40	Correct	222 ms	19960 KB	Output is correct
41	Correct	247 ms	19960 KB	Output is correct
42	Correct	237 ms	19832 KB	Output is correct
43	Correct	601 ms	69216 KB	Output is correct
44	Correct	8 ms	12160 KB	Output is correct
45	Runtime error	24 ms	24320 KB	Execution killed with signal 11
46	Halted	0 ms	0 KB	-