Submission #577737

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
577737	2022-06-15T08:28:55 Z	Theo830	Ancient Books (IOI17_books)	C++17	50 / 100	129 ms	41040 KB

books

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9;
ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<int,int>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
#include "books.h"
long long minimum_walk(std::vector<int> p, int s) {
    ll ans = 0;
    ll n = p.size();
    bool v[n] = {0};
    ll dist = 0;
    ll l[n],r[n];
    vector<ii>rang;
    ll L = -1,R;
    if(p[s] == s){
        L = R = s;
    }
    f(i,0,n){
        if(p[i] != i && !v[i]){
            ll last = i;
            ll st = i;
            ll pos = p[i];
            v[i] = 1;
            l[st] = i,r[st] = pos;
            while(pos != st){
                l[st] = min(l[st],pos);
                r[st] = max(r[st],pos);
                v[pos] = 1;
                ans += abs(pos - last);
                last = pos;
                pos = p[pos];
            }
            ans += abs(pos - last);
            l[st] = min(l[st],pos);
            r[st] = max(r[st],pos);
            rang.pb(ii(l[st],r[st]));
            if(v[s] == 1 && L == -1){
                L = l[st];
                R = r[st];
            }
        }
    }
    if(rang.empty()){
        return ans;
    }
    vector<ii>left,right;
    ll LL = L,RR = R;
    for(auto x:rang){
        if(LL <= x.F && x.F <= RR){
            L = min(L,x.F);
            R = max(R,x.S);
        }
        else if(LL <= x.S && x.S <= RR){
            L = min(L,x.F);
            R = max(R,x.S);
        }
        else if(x.F <= LL && RR <= x.S){
            L = min(L,x.F);
            R = max(R,x.S);
        }
        else if(x.F < L){
            left.pb(ii(x.S,x.F));
        }
        else{
            right.pb(ii(x.F,x.S));
        }
    }
    sort(all(left));
    sort(all(right));
    reverse(all(right));
    while(!left.empty()){
        dist += L - left.back().F;
        L = left.back().S;
        L = min(L,right.back().S);
        while(!left.empty() && left.back().F >= L){
            L = min(L,left.back().S);
            left.pop_back();
        }
    }
    while(!right.empty() && right.back().F <= R){
        R = max(R,right.back().S);
        right.pop_back();
    }
    while(!right.empty()){
        dist += right.back().F - R;
        R = max(R,right.back().S);
        while(!right.empty() && right.back().F <= R){
            R = max(R,right.back().S);
            right.pop_back();
        }
    }
    ans += 2 * dist;
    return ans;
}
/*
int main() {
    int n, s;
    assert(2 == scanf("%d %d", &n, &s));

    vector<int> p((unsigned) n);
    for(int i = 0; i < n; i++)
        assert(1 == scanf("%d", &p[(unsigned) i]));

    long long res = minimum_walk(p, s);
    printf("%lld\n", res);

    return 0;
}
*/
/*
4 0
0 2 3 1
*/

Compilation message

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:76:27: warning: 'R' may be used uninitialized in this function [-Wmaybe-uninitialized]
   76 |         else if(x.F <= LL && RR <= x.S){
      |                           ^

Subtask #1

12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct

Subtask #2

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	0 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	212 KB	Output is correct
23	Correct	1 ms	212 KB	Output is correct
24	Correct	1 ms	212 KB	Output is correct
25	Correct	1 ms	212 KB	Output is correct
26	Correct	1 ms	212 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	212 KB	Output is correct
29	Correct	1 ms	304 KB	Output is correct

Subtask #3

28.0 / 28.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	0 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	212 KB	Output is correct
23	Correct	1 ms	212 KB	Output is correct
24	Correct	1 ms	212 KB	Output is correct
25	Correct	1 ms	212 KB	Output is correct
26	Correct	1 ms	212 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	212 KB	Output is correct
29	Correct	1 ms	304 KB	Output is correct
30	Correct	129 ms	31468 KB	Output is correct
31	Correct	127 ms	31464 KB	Output is correct
32	Correct	100 ms	31464 KB	Output is correct
33	Correct	113 ms	40656 KB	Output is correct
34	Correct	112 ms	40660 KB	Output is correct
35	Correct	116 ms	41040 KB	Output is correct
36	Correct	108 ms	40016 KB	Output is correct
37	Correct	102 ms	32580 KB	Output is correct
38	Correct	103 ms	31716 KB	Output is correct
39	Correct	100 ms	31724 KB	Output is correct
40	Correct	109 ms	31464 KB	Output is correct
41	Correct	115 ms	31460 KB	Output is correct
42	Correct	110 ms	31456 KB	Output is correct
43	Correct	107 ms	35672 KB	Output is correct

Subtask #4

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	212 KB	3rd lines differ - on the 1st token, expected: '3304', found: '2744'
2	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	0 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	212 KB	Output is correct
23	Correct	1 ms	212 KB	Output is correct
24	Correct	1 ms	212 KB	Output is correct
25	Correct	1 ms	212 KB	Output is correct
26	Correct	1 ms	212 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	212 KB	Output is correct
29	Correct	1 ms	304 KB	Output is correct
30	Correct	129 ms	31468 KB	Output is correct
31	Correct	127 ms	31464 KB	Output is correct
32	Correct	100 ms	31464 KB	Output is correct
33	Correct	113 ms	40656 KB	Output is correct
34	Correct	112 ms	40660 KB	Output is correct
35	Correct	116 ms	41040 KB	Output is correct
36	Correct	108 ms	40016 KB	Output is correct
37	Correct	102 ms	32580 KB	Output is correct
38	Correct	103 ms	31716 KB	Output is correct
39	Correct	100 ms	31724 KB	Output is correct
40	Correct	109 ms	31464 KB	Output is correct
41	Correct	115 ms	31460 KB	Output is correct
42	Correct	110 ms	31456 KB	Output is correct
43	Correct	107 ms	35672 KB	Output is correct
44	Incorrect	1 ms	212 KB	3rd lines differ - on the 1st token, expected: '3304', found: '2744'
45	Halted	0 ms	0 KB	-