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Submission #316569

# Submission time Handle Problem Language Result Execution time Memory
316569 2020-10-26T16:49:08 Z mohamedsobhi777 Sorting (IOI15_sorting) C++14
20 / 100
 209 ms 876 KB 
#include <bits/stdc++.h>
#include "sorting.h"

using namespace std;
const int _N = 2e5;

int n, m;
int s[_N], _s[_N];
int x[_N], y[_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]]);
        }
}

bool can(int mid)
{
        int nxt[_N];
        for (int i = 0; i < n; ++i)
                nxt[i] = s[i];
        for (int j = 0; j < mid; ++j)
                swap(nxt[x[j]], nxt[y[j]]);
        ++t;
        int ret = 0;
        for (int i = 0; i < n; ++i)
        {
                int cur = nxt[i];
                if (viz[i] == t)
                        continue;
                ++ret;
                while (cur != i)
                {
                        viz[cur] = t;
                        cur = nxt[cur];
                }
                viz[cur] = t;
        }
        return n - ret <= mid;
}

int binary_sr4()
{
        int ret = m;
        int lo = 1, hi = m;
        while (lo <= hi)
        {
                int mid = (lo + hi) >> 1;
                if (can(mid))
                        hi = mid - 1, ret = mid;
                else
                        lo = mid + 1;
        }
        return ret;
}

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)
        {
                Nxt[i] = S[i];
                s[i] = S[i];
                _s[i] = S[i];
                rep[i] = i;
        }
        cyc = cycles();
        if (n - cyc == 0)
                return 0;
        int opt = binary_sr4();
        bool conv = 0;
        for (int i = 1; i < M; ++i)
        {
                if (can(i))
                        conv = 1;
                assert(can(i) == conv);
        }
        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]]);
                if (n - cycles() <= i + 1)
                {
                        assert(can(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:56:27: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   56 |         while (ans.size() < X)
      |                ~~~~~~~~~~~^~~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:127:13: warning: unused variable 'opt' [-Wunused-variable]
  127 |         int opt = binary_sr4();
      |             ^~~

Subtask #1
8.0 / 8.0

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

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 35 ms 384 KB Output is correct
11 Correct 35 ms 384 KB Output is correct
12 Correct 33 ms 384 KB Output is correct

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Runtime error 33 ms 632 KB Execution killed with signal 11 (could be triggered by violating memory limits)
4 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 35 ms 384 KB Output is correct
11 Correct 35 ms 384 KB Output is correct
12 Correct 33 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Runtime error 33 ms 632 KB Execution killed with signal 11 (could be triggered by violating memory limits)
16 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 209 ms 876 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Runtime error 209 ms 876 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -