CSES - Datatähti Open 2021 - Results
Submission details
Task:Sorting
Sender:pidddgy
Submission time:2021-01-31 20:21:17 +0200
Language:C++11
Status:READY
Result:36
Feedback
groupverdictscore
#1ACCEPTED36
#20
Test results
testverdicttimegroup
#1ACCEPTED0.20 s1, 2details
#20.19 s2details
#3ACCEPTED0.20 s1, 2details
#4ACCEPTED0.20 s1, 2details

Code

#include <bits/stdc++.h>
using namespace std;
// #define cerr if(false) cerr
#define watch(x) cerr << (#x) << " is " << (x) << endl;
#define endl '\n'
#define ld long double
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define sz(a) (int)(a).size()
#define y1 lsdjkfhshfdsighoihweogihewoghi
#define all(x) (x).begin(), (x).end()
 
const int maxn = 10;
int n;
set<vector<int>> vis[10];

map<vector<int>, vector<int>> par;
 
void solve() {
    cin >> n;
 
    vector<int> a;
    for(int i = 1; i <= n; i++) {
        int x;
        cin >> x;
 
        a.push_back(x);
    }    

    if(vis[n].count(a)) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
}
 
 
 
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    for(int len = 1; len <= 8; len++) {
            vector<int> a;
            for(int i = 1; i <= len; i++) {
                a.push_back(i);
            }    

            vector<int> orig = a;
        
            queue<vector<int>> Q;
            Q.push(a);
            vis[len].emplace(a);
        
            while(!Q.empty()) {
                vector<int> v = Q.front(); Q.pop();
        
                for(int i = 0; i+1 < sz(v); i++) {
                    for(int j = i+2; j+1 < sz(v); j++) {
                        vector<int> cpy = v;
                        swap(v[i], v[j]);
                        swap(v[i+1], v[j+1]);
        
                        if(!vis[len].count(v)) {
                            par[v] = cpy;
                            Q.push(v);
                            vis[len].emplace(v);
                        }
                        swap(v[i], v[j]);
                        swap(v[i+1], v[j+1]);
                    }
                }
            }
    }
 
    int t;
    cin >> t;
 
    while(t--) solve();
}
 
/*
40 320 000
 
322 560 000
*/
 
// Did you read the bounds?
// Did you make typos?
// Are there edge cases (N=1?)
// Are array sizes proper?
// Integer overflow?
// DS reset properly between test cases?
// Is using long longs causing TLE?
// Are you using floating points?

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

input
153
1
1
2
1 2
...

correct output
YES
YES
NO
NO
NO
...

user output
YES
YES
NO
NO
NO
...

Test 2

Group: 2

Verdict:

input
1000
59
35 29 32 50 11 15 9 21 19 45 2...

correct output
YES
NO
YES
NO
YES
...

user output
(empty)

Test 3

Group: 1, 2

Verdict: ACCEPTED

input
720
6
1 6 4 5 2 3
6
6 3 2 1 5 4
...

correct output
YES
NO
NO
NO
YES
...

user output
YES
NO
NO
NO
YES
...

Test 4

Group: 1, 2

Verdict: ACCEPTED

input
1000
8
7 4 2 8 6 3 5 1
8
3 8 2 7 5 4 6 1
...

correct output
NO
NO
YES
NO
YES
...

user output
NO
NO
YES
NO
YES
...