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Submission #861301

# Submission time Handle Problem Language Result Execution time Memory
861301 2023-10-15T23:18:07 Z pedroslrey Sorting (IOI15_sorting) C++14
100 / 100
 220 ms 20276 KB 
#include <bits/stdc++.h>
#include "sorting.h"

using namespace std;

bool check(int n, int xs[], int k, int ss1[], int ss2[], int ans1[] = nullptr, int ans2[] = nullptr) {
	vector<int> ideal(n), idealrev(n), ys(n), ysrev(n);
	for (int i = 0; i < n; ++i)
		ideal[i] = idealrev[i] = ysrev[ys[i] = xs[i]] = i;

	for (int i = k-1; i >= 0; --i) {
		swap(ideal[ss1[i]], ideal[ss2[i]]);
		swap(idealrev[ideal[ss1[i]]], idealrev[ideal[ss2[i]]]);
	}

	int lst = 0;
	for (int i = 0; i < k; ++i) {
		swap(ideal[ss1[i]], ideal[ss2[i]]);
		swap(idealrev[ideal[ss1[i]]], idealrev[ideal[ss2[i]]]);
		swap(ys[ss1[i]], ys[ss2[i]]);
		swap(ysrev[ys[ss1[i]]], ysrev[ys[ss2[i]]]);

		// cerr << "-> " << lst << " " << idealrev[lst] << " " << ysrev[lst] << "\n";
		while (lst < n && idealrev[lst] == ysrev[lst]) ++lst;
		if (lst < n) {
			int a = ysrev[lst], b = idealrev[lst]; 
			swap(ys[a], ys[b]);
			swap(ysrev[ys[a]], ysrev[ys[b]]);

			if (ans1 != nullptr) { ans1[i] = a; ans2[i] = b; }
		}
		else if (ans1 != nullptr) { ans1[i] = 0; ans2[i] = 0; }
	}

	for (int i = 0; i < n; ++i)
		if (ys[i] != i) return false;
	// cerr << k << "TRUE\n";
	return true;
}

int findSwapPairs(int n, int xs[], int m, int ss1[], int ss2[], int ans1[], int ans2[]) {
	int l = 0, r = m;
	while (l < r) {
		int mid = (l + r)/2;

		if (check(n, xs, mid, ss1, ss2)) r = mid;
		else l = mid + 1;
	}

	check(n, xs, r, ss1, ss2, ans1, ans2);
	return r;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 568 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 580 KB Output is correct
27 Correct 1 ms 348 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 448 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 2 ms 604 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Correct 2 ms 604 KB Output is correct
14 Correct 1 ms 528 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 448 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 2 ms 604 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Correct 2 ms 604 KB Output is correct
14 Correct 1 ms 528 KB Output is correct
15 Correct 157 ms 16848 KB Output is correct
16 Correct 180 ms 17572 KB Output is correct
17 Correct 209 ms 19760 KB Output is correct
18 Correct 78 ms 16448 KB Output is correct
19 Correct 151 ms 19820 KB Output is correct
20 Correct 158 ms 20276 KB Output is correct
21 Correct 163 ms 18628 KB Output is correct
22 Correct 153 ms 13552 KB Output is correct
23 Correct 191 ms 19076 KB Output is correct
24 Correct 213 ms 18876 KB Output is correct
25 Correct 205 ms 18648 KB Output is correct
26 Correct 159 ms 18672 KB Output is correct
27 Correct 147 ms 18120 KB Output is correct
28 Correct 215 ms 18940 KB Output is correct
29 Correct 197 ms 18312 KB Output is correct
30 Correct 118 ms 17800 KB Output is correct
31 Correct 202 ms 18764 KB Output is correct
32 Correct 169 ms 18308 KB Output is correct
33 Correct 220 ms 18976 KB Output is correct
34 Correct 191 ms 18728 KB Output is correct
35 Correct 154 ms 17728 KB Output is correct
36 Correct 64 ms 17688 KB Output is correct
37 Correct 214 ms 19636 KB Output is correct
38 Correct 205 ms 18596 KB Output is correct
39 Correct 210 ms 18728 KB Output is correct