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Submission #316549

# Submission time Handle Problem Language Result Execution time Memory
316549 2020-10-26T15:51:16 Z mohamedsobhi777 Sorting (IOI15_sorting) C++14
74 / 100
 1000 ms 8824 KB 
#include <bits/stdc++.h>
#include "sorting.h"

using namespace std;
const int _N = 2e5;

int n;
int s[_N], _s[_N];
int x[_N], y[_N];
int nxt[_N];
int t;
int viz[_N];
int Nxt[_N];
int cyc = 0;
int pos[_N];
int rep[_N];

int cycles()
{
        ++t;
        int ret = 0;
        for (int i = 0; i < n; ++i)
        {
                int cnt = 1;
                int cur = Nxt[i];
                if (viz[i] == t)
                        continue;
                ++ret;
                while (cur != i)
                {
                        viz[cur] = t;
                        cur = Nxt[cur];
                        ++cnt;
                }
                viz[cur] = t;
        }
        return ret;
}
vector<pair<int, int>> ans, ans2;

void solve(int X)
{
        map<int, int> vis;
        for (int i = 0; i < n; ++i)
        {
                if (vis[i])
                        continue;
                int cur = Nxt[i];
                while (cur != i)
                {
                        ++vis[cur];
                        ans.push_back({i, cur});
                        cur = Nxt[cur];
                }
                ++vis[cur];
        }
        while (ans.size() < X)
                ans.push_back({0, 0});
        ans2.resize(X);

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

        for (int i = 0; i < X; ++i)
        {
                int x1 = pos[_s[x[i]]];
                int x2 = pos[_s[y[i]]];
                swap(rep[x1], rep[x2]);
                ans2[i] = {rep[ans[i].first], rep[ans[i].second]};
                swap(_s[x[i]], _s[y[i]]);
        }
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[])
{
        n = N;
        for (int i = 0; i < N; ++i)
        {
                Nxt[i] = S[i];
                s[i] = S[i];
                _s[i] = S[i];
                rep[i] = i;
        }
        cyc = cycles();

        if (n - cyc == 0)
                return 0;
        for (int i = 0; i < M; ++i)
        {
                x[i] = X[i];
                y[i] = Y[i];
                swap(s[X[i]], s[Y[i]]);
                swap(rep[X[i]], rep[Y[i]]);
                swap(Nxt[X[i]], Nxt[Y[i]]);
                cyc = cycles();
                if (n - cyc <= i + 1)
                {
                        solve(i + 1);
                        for (int j = 0; j <= i; ++j)
                        {
                                P[j] = ans2[j].first;
                                Q[j] = ans2[j].second;
                        }
                        return ++i;
                }
        }
        return 0;
}

Compilation message

sorting.cpp: In function 'void solve(int)':
sorting.cpp:57:27: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   57 |         while (ans.size() < X)
      |                ~~~~~~~~~~~^~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 0 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 2 ms 512 KB Output is correct
22 Correct 2 ms 512 KB Output is correct
23 Correct 2 ms 512 KB Output is correct
24 Correct 2 ms 512 KB Output is correct
25 Correct 1 ms 512 KB Output is correct
26 Correct 2 ms 512 KB Output is correct
27 Correct 2 ms 512 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 640 KB Output is correct
2 Correct 15 ms 640 KB Output is correct
3 Correct 13 ms 640 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 3 ms 512 KB Output is correct
7 Correct 9 ms 640 KB Output is correct
8 Correct 14 ms 640 KB Output is correct
9 Correct 14 ms 640 KB Output is correct
10 Correct 14 ms 640 KB Output is correct
11 Correct 15 ms 640 KB Output is correct
12 Correct 9 ms 640 KB Output is correct
13 Correct 17 ms 640 KB Output is correct
14 Correct 1 ms 512 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 640 KB Output is correct
2 Correct 15 ms 640 KB Output is correct
3 Correct 13 ms 640 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 3 ms 512 KB Output is correct
7 Correct 9 ms 640 KB Output is correct
8 Correct 14 ms 640 KB Output is correct
9 Correct 14 ms 640 KB Output is correct
10 Correct 14 ms 640 KB Output is correct
11 Correct 15 ms 640 KB Output is correct
12 Correct 9 ms 640 KB Output is correct
13 Correct 17 ms 640 KB Output is correct
14 Correct 1 ms 512 KB Output is correct
15 Execution timed out 1092 ms 8824 KB Time limit exceeded
16 Halted 0 ms 0 KB -