CSES - Aalto Competitive Programming 2024 - wk8 - Mon - Results
Submission details
Task:Optimal sort
Sender:bubu2006
Submission time:2024-10-28 16:49:57 +0200
Language:C++ (C++20)
Status:READY
Result:ACCEPTED
Test results
testverdicttime
#1ACCEPTED0.00 sdetails
#2ACCEPTED0.00 sdetails
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Code

#pragma GCC optimize("O3","unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")

#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

string to_string(string s) {
    return '"' + s + '"';
}
 
string to_string(const char* s) {
    return to_string((string) s);
}
 
string to_string(bool b) {
    return (b ? "true" : "false");
}
 
template <typename A, typename B>
string to_string(pair<A, B> p) {
    return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
 
template <typename A>
string to_string(A v) {
    bool first = true;
    string res = "{";
    for (const auto &x : v) {
        if (!first) {
            res += ", ";
        }
        first = false;
        res += to_string(x);
    }
    res += "}";
    return res;
}
 
void debug_out() {
    cerr << endl;
}
 
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << to_string(H);
    debug_out(T...);
}
 
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif


signed main() {
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit); // RTE if input wrong datatype

    int n;
    cin >> n;

    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

    vector<int> d = a;
    sort(all(d));

    for (int i = 0; i < n; i++) {
        a[i] = lower_bound(all(d), a[i]) - d.begin();
    }

    vector<bool> vis(n);
    vector<int> par(n);
    for (int i = 0; i < n; i++) {
        par[a[i]] = i;
    }

    int ans = n;
    for (int i = 0; i < n; i++) {
        if (vis[i]) continue;
        vis[i] = 1;
        int u = par[i];
        while (u != i) {
            vis[u] = 1;
            u = par[u];
        }
        ans--;
    }
    
    cout << ans;
}

Test details

Test 1

Verdict: ACCEPTED

input
1
14 

correct output
0

user output
0

Test 2

Verdict: ACCEPTED

input
2
18 1 

correct output
1

user output
1

Test 3

Verdict: ACCEPTED

input
2
3 8 

correct output
0

user output
0

Test 4

Verdict: ACCEPTED

input
3
6 13 8 

correct output
1

user output
1

Test 5

Verdict: ACCEPTED

input
3
8 6 14 

correct output
1

user output
1

Test 6

Verdict: ACCEPTED

input
3
19 11 5 

correct output
1

user output
1

Test 7

Verdict: ACCEPTED

input
4
17 15 16 13 

correct output
1

user output
1

Test 8

Verdict: ACCEPTED

input
4
16 8 12 19 

correct output
2

user output
2

Test 9

Verdict: ACCEPTED

input
4
13 18 5 15 

correct output
3

user output
3

Test 10

Verdict: ACCEPTED

input
4
20 18 11 17 

correct output
3

user output
3

Test 11

Verdict: ACCEPTED

input
5
17 12 15 13 11 

correct output
2

user output
2

Test 12

Verdict: ACCEPTED

input
5
15 20 9 1 19 

correct output
4

user output
4

Test 13

Verdict: ACCEPTED

input
5
1 11 9 19 4 

correct output
2

user output
2

Test 14

Verdict: ACCEPTED

input
5
17 2 15 6 12 

correct output
4

user output
4

Test 15

Verdict: ACCEPTED

input
5
4 18 20 11 19 

correct output
3

user output
3

Test 16

Verdict: ACCEPTED

input
5
2 5 8 17 18 

correct output
0

user output
0

Test 17

Verdict: ACCEPTED

input
5
19 5 7 17 18 

correct output
4

user output
4

Test 18

Verdict: ACCEPTED

input
5
2 5 9 7 16 

correct output
1

user output
1

Test 19

Verdict: ACCEPTED

input
5
8 20 1 18 5 

correct output
2

user output
2

Test 20

Verdict: ACCEPTED

input
5
10 8 11 3 1 

correct output
4

user output
4

Test 21

Verdict: ACCEPTED

input
10
8 18 15 13 6 12 9 17 2 11 

correct output
6

user output
6

Test 22

Verdict: ACCEPTED

input
10
5 7 1 19 9 20 8 3 2 15 

correct output
9

user output
9

Test 23

Verdict: ACCEPTED

input
10
5 11 10 7 4 14 19 1 9 13 

correct output
8

user output
8

Test 24

Verdict: ACCEPTED

input
10
17 12 2 3 18 15 9 6 11 1 

correct output
9

user output
9

Test 25

Verdict: ACCEPTED

input
10
18 13 20 12 4 5 19 15 14 11 

correct output
7

user output
7

Test 26

Verdict: ACCEPTED

input
10
18 8 17 2 10 13 16 5 19 20 

correct output
7

user output
7

Test 27

Verdict: ACCEPTED

input
10
3 5 18 19 17 2 1 20 8 7 

correct output
8

user output
8

Test 28

Verdict: ACCEPTED

input
10
9 7 16 5 20 2 10 15 11 6 

correct output
7

user output
7

Test 29

Verdict: ACCEPTED

input
10
17 8 11 20 18 5 16 9 1 13 

correct output
8

user output
8

Test 30

Verdict: ACCEPTED

input
10
5 10 11 2 1 7 3 9 18 8 

correct output
9

user output
9

Test 31

Verdict: ACCEPTED

input
100
567896598 831327091 483130123 ...

correct output
95

user output
95

Test 32

Verdict: ACCEPTED

input
100
253498609 556362063 442153869 ...

correct output
95

user output
95

Test 33

Verdict: ACCEPTED

input
100
833824080 874174469 536879893 ...

correct output
96

user output
96

Test 34

Verdict: ACCEPTED

input
100
55262494 701594610 766185388 6...

correct output
98

user output
98

Test 35

Verdict: ACCEPTED

input
100
385222461 258813232 585406893 ...

correct output
95

user output
95

Test 36

Verdict: ACCEPTED

input
100
528427003 520690782 556647080 ...

correct output
92

user output
92

Test 37

Verdict: ACCEPTED

input
100
845689539 115595477 723524474 ...

correct output
95

user output
95

Test 38

Verdict: ACCEPTED

input
100
566683130 399845016 457901037 ...

correct output
98

user output
98

Test 39

Verdict: ACCEPTED

input
100
401801721 431563805 933290530 ...

correct output
95

user output
95

Test 40

Verdict: ACCEPTED

input
100
941909102 224913296 697438766 ...

correct output
97

user output
97

Test 41

Verdict: ACCEPTED

input
200
444811497 903431470 720091934 ...

correct output
191

user output
191

Test 42

Verdict: ACCEPTED

input
200
336536656 534840541 835789078 ...

correct output
194

user output
194

Test 43

Verdict: ACCEPTED

input
200
395789335 866736363 824087376 ...

correct output
195

user output
195

Test 44

Verdict: ACCEPTED

input
200
238325464 289089504 743727937 ...

correct output
192

user output
192

Test 45

Verdict: ACCEPTED

input
200
718880754 431102449 403271411 ...

correct output
197

user output
197

Test 46

Verdict: ACCEPTED

input
200
97225921 989421484 860498340 2...

correct output
194

user output
194

Test 47

Verdict: ACCEPTED

input
200
296729043 504301807 26318971 8...

correct output
193

user output
193

Test 48

Verdict: ACCEPTED

input
200
903692950 776814822 973264570 ...

correct output
196

user output
196

Test 49

Verdict: ACCEPTED

input
200
290066783 874736248 463312759 ...

correct output
192

user output
192

Test 50

Verdict: ACCEPTED

input
200
973107823 90258367 557823872 1...

correct output
194

user output
194

Test 51

Verdict: ACCEPTED

input
1000
592912152 847045692 284064425 ...

correct output
990

user output
990

Test 52

Verdict: ACCEPTED

input
1000
407810678 616563051 942898335 ...

correct output
990

user output
990

Test 53

Verdict: ACCEPTED

input
1000
618641025 671935409 944035992 ...

correct output
993

user output
993

Test 54

Verdict: ACCEPTED

input
1000
366766968 558964810 539824828 ...

correct output
994

user output
994

Test 55

Verdict: ACCEPTED

input
1000
307827860 66173733 860833950 9...

correct output
994

user output
994

Test 56

Verdict: ACCEPTED

input
1000
249869917 995683003 692483481 ...

correct output
991

user output
991

Test 57

Verdict: ACCEPTED

input
1000
955687818 719718081 43478262 6...

correct output
990

user output
990

Test 58

Verdict: ACCEPTED

input
1000
734196441 465297605 360643915 ...

correct output
992

user output
992

Test 59

Verdict: ACCEPTED

input
1000
851978986 549468516 638503725 ...

correct output
988

user output
988

Test 60

Verdict: ACCEPTED

input
1000
310014536 901327171 160589368 ...

correct output
992

user output
992

Test 61

Verdict: ACCEPTED

input
100000
614666693 269733332 88642683 5...

correct output
99989

user output
99989

Test 62

Verdict: ACCEPTED

input
100000
272940982 811925955 61591592 5...

correct output
99992

user output
99992

Test 63

Verdict: ACCEPTED

input
100000
620599476 742651279 318143272 ...

correct output
99989

user output
99989

Test 64

Verdict: ACCEPTED

input
100000
848936553 838116035 936109023 ...

correct output
99983

user output
99983

Test 65

Verdict: ACCEPTED

input
100000
480849086 599714294 875965742 ...

correct output
99984

user output
99984

Test 66

Verdict: ACCEPTED

input
100000
888068198 739874627 942196434 ...

correct output
99987

user output
99987

Test 67

Verdict: ACCEPTED

input
100000
169827791 713679537 698075748 ...

correct output
99986

user output
99986

Test 68

Verdict: ACCEPTED

input
100000
636712086 376507123 906440322 ...

correct output
99987

user output
99987

Test 69

Verdict: ACCEPTED

input
100000
300349845 13933235 833947124 8...

correct output
99985

user output
99985

Test 70

Verdict: ACCEPTED

input
100000
200888519 710864746 665880694 ...

correct output
99985

user output
99985