oj.uz

Submission #474202

# Submission time Handle Problem Language Result Execution time Memory
474202 2021-09-17T10:51:12 Z jwvg0425 Sorting (IOI15_sorting) C++17
74 / 100
 1000 ms 16968 KB 
#include <stdio.h>
#include <vector>
#include <queue>
#include <algorithm>
#include <iostream>
#include <string>
#include <bitset>
#include <map>
#include <set>
#include <tuple>
#include <string.h>
#include <math.h>
#include <random>
#include <functional>
#include <assert.h>
#include <math.h>
#include "sorting.h"
#define all(x) (x).begin(), (x).end()
#define xx first
#define yy second

using namespace std;

template<typename T, typename Pr = less<T>>
using pq = priority_queue<T, vector<T>, Pr>;
using i64 = long long int;
using ii = pair<int, int>;
using ii64 = pair<i64, i64>;

bool sorted(vector<int> s)
{
	for (int i = 0; i < s.size(); i++)
		if (s[i] != i)
			return false;

	return true;
}

vector<ii> solve(vector<int> s, vector<ii> r, int k)
{
	int n = s.size();
	r.resize(k);
	int m = r.size();
	vector<ii> res;

	for (int i = 0; i < m && !sorted(s); i++)
	{
		vector<int> rev(n), idx(n), pos(n);
		swap(s[r[i].xx], s[r[i].yy]);

		for (int j = 0; j < n; j++)
			pos[s[j]] = j;

		for (int j = 0; j < n; j++)
			rev[j] = j;

		for (int j = i + 1; j < m; j++)
			swap(rev[r[j].xx], rev[r[j].yy]);

		for (int j = 0; j < n; j++)
			idx[rev[j]] = j;

		// s[x] -> idx[x]
		bool f = false;
		for (int x = 0; x < n && !f; x++)
		{
			if (s[x] == idx[x])
				continue;

			res.emplace_back(x, pos[idx[x]]);
			swap(s[x], s[pos[idx[x]]]);
			f = true;
		}

		if (!f)
			res.emplace_back(0, 0);
	}

	if (!sorted(s))
		res.clear();

	return res;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[])
{
	vector<int> s(N);
	vector<ii> r(M);

	for (int i = 0; i < N; i++)
		s[i] = S[i];

	for (int i = 0; i < M; i++)
	{
		r[i].xx = X[i];
		r[i].yy = Y[i];
	}

	int lo = 0, hi = M;
	vector<ii> res;

	while (lo <= hi)
	{
		int mid = (lo + hi) / 2;
		auto now = solve(s, r, mid);

		if (now.empty())
		{
			lo = mid + 1;
		}
		else
		{
			res = now;
			hi = mid - 1;
		}
	}

	for (int i = 0; i < res.size(); i++)
	{
		P[i] = res[i].xx;
		Q[i] = res[i].yy;
	}

	return res.size();
}

Compilation message

sorting.cpp: In function 'bool sorted(std::vector<int>)':
sorting.cpp:32:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |  for (int i = 0; i < s.size(); i++)
      |                  ~~^~~~~~~~~~
sorting.cpp: In function 'std::vector<std::pair<int, int> > solve(std::vector<int>, std::vector<std::pair<int, int> >, int)':
sorting.cpp:41:16: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   41 |  int n = s.size();
      |          ~~~~~~^~
sorting.cpp:43:16: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   43 |  int m = r.size();
      |          ~~~~~~^~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:118:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  118 |  for (int i = 0; i < res.size(); i++)
      |                  ~~^~~~~~~~~~~~
sorting.cpp:124:17: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
  124 |  return res.size();
      |         ~~~~~~~~^~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 3 ms 332 KB Output is correct
12 Correct 3 ms 392 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 3 ms 332 KB Output is correct
5 Correct 3 ms 332 KB Output is correct
6 Correct 0 ms 204 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 3 ms 332 KB Output is correct
12 Correct 3 ms 392 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 3 ms 332 KB Output is correct
16 Correct 3 ms 332 KB Output is correct
17 Correct 3 ms 332 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 215 ms 736 KB Output is correct
22 Correct 208 ms 744 KB Output is correct
23 Correct 227 ms 664 KB Output is correct
24 Correct 209 ms 708 KB Output is correct
25 Correct 209 ms 764 KB Output is correct
26 Correct 207 ms 796 KB Output is correct
27 Correct 205 ms 736 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 414 ms 520 KB Output is correct
2 Correct 457 ms 500 KB Output is correct
3 Correct 446 ms 624 KB Output is correct
4 Correct 1 ms 460 KB Output is correct
5 Correct 130 ms 488 KB Output is correct
6 Correct 165 ms 588 KB Output is correct
7 Correct 291 ms 528 KB Output is correct
8 Correct 479 ms 608 KB Output is correct
9 Correct 446 ms 664 KB Output is correct
10 Correct 482 ms 532 KB Output is correct
11 Correct 426 ms 460 KB Output is correct
12 Correct 295 ms 528 KB Output is correct
13 Correct 498 ms 620 KB Output is correct
14 Correct 7 ms 484 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 414 ms 520 KB Output is correct
2 Correct 457 ms 500 KB Output is correct
3 Correct 446 ms 624 KB Output is correct
4 Correct 1 ms 460 KB Output is correct
5 Correct 130 ms 488 KB Output is correct
6 Correct 165 ms 588 KB Output is correct
7 Correct 291 ms 528 KB Output is correct
8 Correct 479 ms 608 KB Output is correct
9 Correct 446 ms 664 KB Output is correct
10 Correct 482 ms 532 KB Output is correct
11 Correct 426 ms 460 KB Output is correct
12 Correct 295 ms 528 KB Output is correct
13 Correct 498 ms 620 KB Output is correct
14 Correct 7 ms 484 KB Output is correct
15 Execution timed out 1087 ms 16968 KB Time limit exceeded
16 Halted 0 ms 0 KB -