#include "sorting.h"
#include <cstring>
#include <algorithm>
using namespace std;
int N, M, s[2000005], x[2000005], y[2000005], state[2000005], seen[2000005], pos[2000005];
int check(int steps) {
for (int i = 0; i < N; i++) state[i] = s[i];
for (int i = 0; i < steps; i++) {
if (x[i] != y[i]) {
swap(state[x[i]], state[y[i]]);
}
}
int cycles = 0;
for (int i = 0; i < N; i++) {
if (!seen[i]) {
seen[i] = 1;
cycles++;
int cur = state[i];
while (cur != i) {
seen[cur] = 1;
cur = state[cur];
}
}
}
int swaps = N - cycles;
memset(seen, 0, sizeof(seen));
return swaps <= steps;
}
int findSwapPairs(int n, int S[], int m, int X[], int Y[], int P[], int Q[]) {
N = n;
M = m;
for (int i = 0; i < N; i++) s[i] = S[i];
for (int i = 0; i < M; i++) {
x[i] = X[i];
y[i] = Y[i];
}
int lo = -1, hi = M;
while (lo + 1 < hi) {
int mid = (lo + hi) / 2;
if (check(mid)) hi = mid;
else lo = mid;
}
// Takes hi number of swaps
for (int i = 0; i < N; i++) state[i] = s[i];
for (int i = 0; i < hi; i++) {
if (x[i] != y[i]) {
swap(state[x[i]], state[y[i]]);
}
}
int R = 0;
for (int i = 0; i < N; i++) {
if (!seen[i]) {
seen[i] = 1;
if (state[i] != i) {
int cur = state[i];
while (cur != i) {
// Swap cur with state[cur]
seen[cur] = 1;
cur = state[cur];
P[R] = cur;
Q[R] = state[cur];
R++;
}
}
}
}
for (int i = 0; i < N; i++) pos[s[i]] = i, state[i] = s[i];
for (int i = 0; i < R; i++) {
swap(pos[state[x[i]]], pos[state[y[i]]]);
swap(state[x[i]], state[y[i]]);
swap(pos[P[i]], pos[Q[i]]);
P[i] = pos[P[i]];
Q[i] = pos[Q[i]];
swap(state[P[i]], state[Q[i]]);
}
for (int i = R; i < hi; i++) P[i] = Q[i] = 0;
return hi;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
8184 KB |
Output is correct |
| 2 |
Correct |
9 ms |
8184 KB |
Output is correct |
| 3 |
Correct |
10 ms |
8184 KB |
Output is correct |
| 4 |
Correct |
10 ms |
8184 KB |
Output is correct |
| 5 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 6 |
Correct |
12 ms |
8184 KB |
Output is correct |
| 7 |
Correct |
11 ms |
8184 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
8184 KB |
Output is correct |
| 2 |
Correct |
9 ms |
8184 KB |
Output is correct |
| 3 |
Correct |
10 ms |
8184 KB |
Output is correct |
| 4 |
Correct |
10 ms |
8184 KB |
Output is correct |
| 5 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 6 |
Correct |
12 ms |
8184 KB |
Output is correct |
| 7 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 8 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 9 |
Correct |
13 ms |
8184 KB |
Output is correct |
| 10 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 11 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 12 |
Correct |
16 ms |
8184 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 2 |
Correct |
13 ms |
8184 KB |
Output is correct |
| 3 |
Correct |
17 ms |
8184 KB |
Output is correct |
| 4 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 5 |
Correct |
17 ms |
8188 KB |
Output is correct |
| 6 |
Correct |
14 ms |
8184 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
8184 KB |
Output is correct |
| 2 |
Correct |
9 ms |
8184 KB |
Output is correct |
| 3 |
Correct |
10 ms |
8184 KB |
Output is correct |
| 4 |
Correct |
10 ms |
8184 KB |
Output is correct |
| 5 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 6 |
Correct |
12 ms |
8184 KB |
Output is correct |
| 7 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 8 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 9 |
Correct |
13 ms |
8184 KB |
Output is correct |
| 10 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 11 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 12 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 13 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 14 |
Correct |
13 ms |
8184 KB |
Output is correct |
| 15 |
Correct |
17 ms |
8184 KB |
Output is correct |
| 16 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 17 |
Correct |
17 ms |
8188 KB |
Output is correct |
| 18 |
Correct |
14 ms |
8184 KB |
Output is correct |
| 19 |
Correct |
11 ms |
8184 KB |
Output is correct |
| 20 |
Correct |
12 ms |
8184 KB |
Output is correct |
| 21 |
Correct |
21 ms |
8440 KB |
Output is correct |
| 22 |
Correct |
18 ms |
8444 KB |
Output is correct |
| 23 |
Correct |
19 ms |
8440 KB |
Output is correct |
| 24 |
Correct |
20 ms |
8420 KB |
Output is correct |
| 25 |
Correct |
18 ms |
8440 KB |
Output is correct |
| 26 |
Correct |
23 ms |
8568 KB |
Output is correct |
| 27 |
Correct |
21 ms |
8440 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 2 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 3 |
Correct |
19 ms |
8312 KB |
Output is correct |
| 4 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 5 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 6 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 7 |
Correct |
19 ms |
8312 KB |
Output is correct |
| 8 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 9 |
Correct |
17 ms |
8312 KB |
Output is correct |
| 10 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 11 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 12 |
Correct |
19 ms |
8312 KB |
Output is correct |
| 13 |
Correct |
17 ms |
8312 KB |
Output is correct |
| 14 |
Correct |
18 ms |
8312 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 2 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 3 |
Correct |
19 ms |
8312 KB |
Output is correct |
| 4 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 5 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 6 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 7 |
Correct |
19 ms |
8312 KB |
Output is correct |
| 8 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 9 |
Correct |
17 ms |
8312 KB |
Output is correct |
| 10 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 11 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 12 |
Correct |
19 ms |
8312 KB |
Output is correct |
| 13 |
Correct |
17 ms |
8312 KB |
Output is correct |
| 14 |
Correct |
18 ms |
8312 KB |
Output is correct |
| 15 |
Correct |
179 ms |
23032 KB |
Output is correct |
| 16 |
Correct |
190 ms |
23288 KB |
Output is correct |
| 17 |
Correct |
205 ms |
24056 KB |
Output is correct |
| 18 |
Correct |
90 ms |
19832 KB |
Output is correct |
| 19 |
Correct |
164 ms |
22264 KB |
Output is correct |
| 20 |
Correct |
183 ms |
22920 KB |
Output is correct |
| 21 |
Correct |
175 ms |
22904 KB |
Output is correct |
| 22 |
Correct |
190 ms |
24312 KB |
Output is correct |
| 23 |
Correct |
197 ms |
24696 KB |
Output is correct |
| 24 |
Correct |
210 ms |
24312 KB |
Output is correct |
| 25 |
Correct |
207 ms |
24184 KB |
Output is correct |
| 26 |
Correct |
180 ms |
27768 KB |
Output is correct |
| 27 |
Correct |
165 ms |
30844 KB |
Output is correct |
| 28 |
Correct |
213 ms |
32892 KB |
Output is correct |
| 29 |
Correct |
205 ms |
32248 KB |
Output is correct |
| 30 |
Correct |
131 ms |
30204 KB |
Output is correct |
| 31 |
Correct |
206 ms |
32760 KB |
Output is correct |
| 32 |
Correct |
212 ms |
32380 KB |
Output is correct |
| 33 |
Correct |
229 ms |
33144 KB |
Output is correct |
| 34 |
Correct |
222 ms |
32888 KB |
Output is correct |
| 35 |
Correct |
183 ms |
30712 KB |
Output is correct |
| 36 |
Correct |
89 ms |
29176 KB |
Output is correct |
| 37 |
Correct |
230 ms |
33528 KB |
Output is correct |
| 38 |
Correct |
221 ms |
32632 KB |
Output is correct |
| 39 |
Correct |
222 ms |
32888 KB |
Output is correct |
