oj.uz

답안 #474721

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
474721 2021-09-19T14:27:59 Z hhhhaura Cat (info1cup19_cat) C++14
25 / 100
 559 ms 32980 KB 
#define wiwihorz
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma loop-opt(on)

#define rep(i, a, b) for(int i = a; i <= b; i ++)
#define rrep(i, a, b) for(int i = b; i >= a; i--)
#define all(x) x.begin(), x.end()
#define ceil(a, b) ((a + b - 1) / (b))

using namespace std;

#define int long long int
#define lld long double
#define pii pair<int, int>
#define random mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count())

#ifdef wiwihorz
#define print(a...) cerr << "Line: " << __LINE__, kout("[" + string(#a) + "] = ", a)
void vprint(auto L, auto R) { while(L < R)cerr << *L << " \n"[next(L) == R], ++L; }
void kout() { cerr << endl; }
template<class T1, class ... T2> void kout(T1 a, T2 ... e) { cerr << a << " ", kout(e...);}
#else
#define print(...) 0
#define vprint(...) 0
#endif
namespace solver {
	int n;
	vector<int> a,vis, b;
	vector<pii> ans;
	void init_(int _n) {
		n = _n;
		ans.clear();
		a.assign(n + 1, 0);
		vis.assign(n + 1, 0);
	}
	void solve() {
		int cnt = 0;
		rep(i, 1, n / 2) if(a[i] != i && !vis[i]) {
			int cur = a[i];
			b.clear(), b.push_back(i);
			vis[i] = 1;
			while(cur != i) {
				b.push_back(cur);
				vis[cur] = 1;
				cur = a[cur];
				assert(b.size() <= n);
			}
			rrep(j, 0, signed(b.size()) - 2) {
				ans.push_back({b[j], b[j + 1]});
				swap(a[b[j]], a[b[j + 1]]);
				swap(a[n - b[j] + 1], a[n - b[j + 1] + 1]);
			}
		}
		rep(i, 1, n) if(a[i - 1] + 1 != a[i]) {
			cout << "-1\n";
			return;
		}
		cout << ans.size() << " " << ans.size() << "\n";
		for(auto i : ans) {
			cout << i.first << " " << i.second << "\n";
		}
		return;		
	}
};
using namespace solver;
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int t; cin >> t;
	while(t--) {
		int n; cin >> n;
		init_(n);
		rep(i, 1, n) cin >> a[i];
		solve();
	}
	return 0;
}

Compilation message

cat.cpp:4: warning: ignoring '#pragma loop ' [-Wunknown-pragmas]
    4 | #pragma loop-opt(on)
      | 
cat.cpp:20:13: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void vprint(auto L, auto R) { while(L < R)cerr << *L << " \n"[next(L) == R], ++L; }
      |             ^~~~
cat.cpp:20:21: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void vprint(auto L, auto R) { while(L < R)cerr << *L << " \n"[next(L) == R], ++L; }
      |                     ^~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from cat.cpp:2:
cat.cpp: In function 'void solver::solve()':
cat.cpp:47:21: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   47 |     assert(b.size() <= n);
      |            ~~~~~~~~~^~~~
cat.cpp:38:7: warning: unused variable 'cnt' [-Wunused-variable]
   38 |   int cnt = 0;
      |       ^~~

Subtask #1
0.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 4 ms 332 KB Wrong answer

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 556 KB Output is correct
2 Correct 24 ms 992 KB Output is correct

Subtask #3
0.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 4 ms 332 KB Wrong answer

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 556 KB Output is correct
2 Correct 24 ms 992 KB Output is correct
3 Correct 546 ms 29876 KB Output is correct
4 Correct 528 ms 29212 KB Output is correct
5 Correct 559 ms 32980 KB Output is correct

Subtask #5
0.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 4 ms 332 KB Wrong answer