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Submission #640380

# Submission time Handle Problem Language Result Execution time Memory
640380 2022-09-14T12:39:16 Z piOOE Sorting (IOI15_sorting) C++17
100 / 100
 438 ms 15080 KB 
#include <bits/stdc++.h>
#include "sorting.h"

using namespace std;

vector<int> inv(vector<int> p) {
    vector<int> inv(p.size());
    for (int i = 0; i < p.size(); ++i) {
        inv[p[i]] = i;
    }
    return inv;
}

int findSwapPairs(int n, int p_[], int M, int X[], int Y[], int P[], int Q[]) {
    auto solve = [&](int m) {
        auto calc = [&](vector<int> p) {
            for (int i = 0; i < m; ++i) {
                swap(p[X[i]], p[Y[i]]);
            }
            return p;
        };
        vector<int> p(p_, p_ + n);
        vector<int> e = calc(p);
        vector<int> rev = inv(p), rev_e = inv(e);
        auto doSwap = [&](int i, int j, bool wtf = true) {
            int x = p[i], y = p[j];
            swap(p[i], p[j]);
            rev[y] = i, rev[x] = j;
            if (wtf) {
                int px = rev_e[x], py = rev_e[y];
                swap(e[px], e[py]);
                rev_e[e[px]] = px, rev_e[e[py]] = py;
            }
        };
        int i = 0;
        for (int r = 0; r < m; ++r){
            doSwap(X[r], Y[r], 0);
            P[r] = 0, Q[r] = 0;
            for (; i < n; ++i) {
                if (e[i] != i) {
                    P[r] = rev[i];
                    Q[r] = rev[e[i]];
                    break;
                }
            }
            doSwap(P[r], Q[r]);
        }
        return is_sorted(p.begin(), p.end());
    };
    int low = -1, high = M;
    while (low + 1 < high) {
        int m = (low + high) >> 1;
        if (solve(m)) {
            high = m;
        } else {
            low = m;
        }
    }
    solve(high);
    return high;
}

Compilation message

sorting.cpp: In function 'std::vector<int> inv(std::vector<int>)':
sorting.cpp:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for (int i = 0; i < p.size(); ++i) {
      |                     ~~^~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 216 KB Output is correct
6 Correct 0 ms 300 KB Output is correct
7 Correct 1 ms 296 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 216 KB Output is correct
6 Correct 0 ms 300 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 300 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 340 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 296 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 216 KB Output is correct
6 Correct 0 ms 300 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 300 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 296 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 2 ms 572 KB Output is correct
22 Correct 2 ms 564 KB Output is correct
23 Correct 2 ms 552 KB Output is correct
24 Correct 2 ms 596 KB Output is correct
25 Correct 2 ms 596 KB Output is correct
26 Correct 2 ms 596 KB Output is correct
27 Correct 2 ms 468 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 476 KB Output is correct
2 Correct 2 ms 468 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 2 ms 372 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 2 ms 380 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 1 ms 440 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 476 KB Output is correct
2 Correct 2 ms 468 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 2 ms 372 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 2 ms 380 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 1 ms 440 KB Output is correct
15 Correct 319 ms 14580 KB Output is correct
16 Correct 344 ms 13472 KB Output is correct
17 Correct 433 ms 14180 KB Output is correct
18 Correct 131 ms 13812 KB Output is correct
19 Correct 271 ms 14364 KB Output is correct
20 Correct 296 ms 14616 KB Output is correct
21 Correct 300 ms 14596 KB Output is correct
22 Correct 319 ms 13744 KB Output is correct
23 Correct 341 ms 14428 KB Output is correct
24 Correct 415 ms 14540 KB Output is correct
25 Correct 420 ms 14468 KB Output is correct
26 Correct 286 ms 15080 KB Output is correct
27 Correct 256 ms 14604 KB Output is correct
28 Correct 403 ms 14628 KB Output is correct
29 Correct 384 ms 14576 KB Output is correct
30 Correct 196 ms 14792 KB Output is correct
31 Correct 381 ms 14692 KB Output is correct
32 Correct 333 ms 14316 KB Output is correct
33 Correct 423 ms 14096 KB Output is correct
34 Correct 371 ms 14204 KB Output is correct
35 Correct 281 ms 14208 KB Output is correct
36 Correct 112 ms 14752 KB Output is correct
37 Correct 438 ms 14808 KB Output is correct
38 Correct 410 ms 14132 KB Output is correct
39 Correct 414 ms 14116 KB Output is correct