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Submission #387262

# Submission time Handle Problem Language Result Execution time Memory
387262 2021-04-08T07:47:08 Z ParsaAlizadeh Sorting (IOI15_sorting) C++17
100 / 100
 204 ms 22600 KB 
#include <bits/stdc++.h>
#include "sorting.h"
using namespace std;

typedef pair<int, int> pii;

vector<int> perm;
vector<pii> alice, bob;

bool check(int t) {
	vector<int> tmp(perm);
	for (int i = 0; i < t; i++) {
		swap(tmp[alice[i].first], tmp[alice[i].second]);
	}
	bob.clear();
	for (int i = 0; i < tmp.size(); i++) {
		while (tmp[i] != i) {
			bob.emplace_back(tmp[i], tmp[tmp[i]]);
			swap(tmp[i], tmp[tmp[i]]);
		}
	}
	while (bob.size() < t)
		bob.emplace_back(0, 0);
	return bob.size() == t;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	perm.assign(S, S + N);
	for (int i = 0; i < M; i++) {
		alice.emplace_back(X[i], Y[i]);
	}
	int L = -1, R = M;
	while (R - L > 1) {
		int mid = (L + R) >> 1;
		(check(mid) ? R : L) = mid;
	}
	check(R);
	vector<int> inv(N);
	for (int i = 0; i < N; i++) {
		inv[perm[i]] = i;
	}
	const auto replc = [&] (int i, int j) {
		swap(perm[i], perm[j]);
		inv[perm[i]] = i;
		inv[perm[j]] = j;
	};
	for (int i = 0; i < R; i++) {
		replc(X[i], Y[i]);
		P[i] = inv[bob[i].first];
		Q[i] = inv[bob[i].second];
		replc(P[i], Q[i]);
	}
	return R;
}

Compilation message

sorting.cpp: In function 'bool check(int)':
sorting.cpp:16:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |  for (int i = 0; i < tmp.size(); i++) {
      |                  ~~^~~~~~~~~~~~
sorting.cpp:22:20: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |  while (bob.size() < t)
      |         ~~~~~~~~~~~^~~
sorting.cpp:24:20: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |  return bob.size() == t;
      |         ~~~~~~~~~~~^~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 2 ms 632 KB Output is correct
22 Correct 2 ms 748 KB Output is correct
23 Correct 2 ms 748 KB Output is correct
24 Correct 2 ms 748 KB Output is correct
25 Correct 2 ms 748 KB Output is correct
26 Correct 2 ms 748 KB Output is correct
27 Correct 2 ms 636 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 492 KB Output is correct
2 Correct 2 ms 492 KB Output is correct
3 Correct 2 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 2 ms 492 KB Output is correct
7 Correct 2 ms 492 KB Output is correct
8 Correct 2 ms 492 KB Output is correct
9 Correct 2 ms 600 KB Output is correct
10 Correct 3 ms 492 KB Output is correct
11 Correct 2 ms 600 KB Output is correct
12 Correct 2 ms 492 KB Output is correct
13 Correct 2 ms 492 KB Output is correct
14 Correct 2 ms 492 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 492 KB Output is correct
2 Correct 2 ms 492 KB Output is correct
3 Correct 2 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 2 ms 492 KB Output is correct
7 Correct 2 ms 492 KB Output is correct
8 Correct 2 ms 492 KB Output is correct
9 Correct 2 ms 600 KB Output is correct
10 Correct 3 ms 492 KB Output is correct
11 Correct 2 ms 600 KB Output is correct
12 Correct 2 ms 492 KB Output is correct
13 Correct 2 ms 492 KB Output is correct
14 Correct 2 ms 492 KB Output is correct
15 Correct 166 ms 19800 KB Output is correct
16 Correct 176 ms 20168 KB Output is correct
17 Correct 204 ms 21320 KB Output is correct
18 Correct 70 ms 17364 KB Output is correct
19 Correct 135 ms 20168 KB Output is correct
20 Correct 146 ms 20552 KB Output is correct
21 Correct 149 ms 20680 KB Output is correct
22 Correct 164 ms 21192 KB Output is correct
23 Correct 183 ms 21576 KB Output is correct
24 Correct 191 ms 21576 KB Output is correct
25 Correct 193 ms 21704 KB Output is correct
26 Correct 147 ms 20552 KB Output is correct
27 Correct 124 ms 19912 KB Output is correct
28 Correct 192 ms 21320 KB Output is correct
29 Correct 185 ms 21320 KB Output is correct
30 Correct 101 ms 19400 KB Output is correct
31 Correct 188 ms 21960 KB Output is correct
32 Correct 185 ms 21064 KB Output is correct
33 Correct 197 ms 21832 KB Output is correct
34 Correct 190 ms 21576 KB Output is correct
35 Correct 134 ms 19912 KB Output is correct
36 Correct 61 ms 18516 KB Output is correct
37 Correct 200 ms 22600 KB Output is correct
38 Correct 190 ms 21576 KB Output is correct
39 Correct 192 ms 22088 KB Output is correct