oj.uz

Submission #594598

# Submission time Handle Problem Language Result Execution time Memory
594598 2022-07-12T17:36:04 Z davi_bart Sorting (IOI15_sorting) C++14
74 / 100
 1000 ms 8748 KB 
#pragma GCC optimize("O3")
#include <bits/stdc++.h>

#include "sorting.h"
using namespace std;
#define ll long long
// #define int ll
#define fi first
#define se second
#define ld long double
#define pb push_back
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int N;
struct Dsu {
    vector<int> par, dim;
    Dsu(vector<int> &k) {
        par.resize(N);
        dim = vector<int>(N, 1);
        iota(par.begin(), par.end(), 0);
        for (int i = 0; i < k.size(); i++) {
            unite(i, k[i]);
        }
    }
    int find(int pos) {
        return par[pos] = par[pos] == pos ? pos : find(par[pos]);
    }
    void unite(int a, int b) {
        a = find(a);
        b = find(b);
        if (a == b) return;
        if (dim[a] < dim[b]) swap(a, b);
        par[b] = a;
        dim[a] += dim[b];
    }
    int conta() {
        int tot = 0;
        for (int i = 0; i < N; i++) {
            if (i == par[i]) tot += dim[i] - 1;
        }
        return tot;
    }
};
vector<int> v;
vector<int> ini;
vector<pair<int, int>> scambi;
vector<bool> vis(200010);
void dfs(int pos, int ini) {
    vis[pos] = 1;
    scambi.pb({pos, v[pos]});
    if (v[pos] == ini) return;
    dfs(v[pos], ini);
}
int findSwapPairs(int N, int S[], int M, int P[], int Q[], int X[], int Y[]) {
    ::N = N;
    for (int i = 0; i < N; i++) v.pb(S[i]);
    ini = v;
    int ans = 0;
    for (int i = 0; i < M; i++) {
        fill(vis.begin(), vis.begin() + N + 10, 0);
        scambi.clear();
        for (int j = 0; j < N; j++) {
            if (vis[j] || v[j] == j) continue;
            dfs(v[j], j);
        }
        if (scambi.size() <= i) {
            ans = i;
            break;
        }
        // Dsu dsu(v);
        // // cout << dsu.conta() << " ";
        // if (dsu.conta() <= i) {
        //     ans = i;
        //     break;
        // }
        swap(v[P[i]], v[Q[i]]);
    }
    // cout << endl;
    // int o = 0;

    // while (1) {
    //     int k = scambi.size();
    //     for (int i = 0; i < N; i++) {
    //         if (v[i] != i) {
    //             scambi.pb({v[i], i});
    //             swap(v[find(v.begin(), v.end(), i) - v.begin()], v[i]);
    //         }
    //     }
    //     if (k == scambi.size()) break;
    // }
    // ans = scambi.size();
    // for (auto [a, b] : scambi) cout << a << " " << b << endl;
    // assert(scambi.size() <= ans);
    v = ini;
    for (int i = 0; i < ans; i++) {
        swap(v[P[i]], v[Q[i]]);
        if (i >= scambi.size()) {
            X[i] = 0;
            Y[i] = 0;
            continue;
        }
        for (int j = 0; j < N; j++) {
            if (v[j] == scambi[i].fi) X[i] = j;
        }
        for (int j = 0; j < N; j++) {
            if (v[j] == scambi[i].se) Y[i] = j;
        }
        swap(v[X[i]], v[Y[i]]);
    }
    // v = ini;
    // for (int i = 0; i < ans; i++) {
    //     swap(v[P[i]], v[Q[i]]);
    //     swap(v[X[i]], v[Y[i]]);
    // }
    // for (int i = 0; i < N; i++) assert(v[i] == i);
    return ans;
}

Compilation message

sorting.cpp: In constructor 'Dsu::Dsu(std::vector<int>&)':
sorting.cpp:20:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for (int i = 0; i < k.size(); i++) {
      |                         ~~^~~~~~~~~~
sorting.cpp: In function 'void dfs(int, int)':
sorting.cpp:47:23: warning: declaration of 'ini' shadows a global declaration [-Wshadow]
   47 | void dfs(int pos, int ini) {
      |                   ~~~~^~~
sorting.cpp:44:13: note: shadowed declaration is here
   44 | vector<int> ini;
      |             ^~~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:53:23: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   53 | int findSwapPairs(int N, int S[], int M, int P[], int Q[], int X[], int Y[]) {
      |                   ~~~~^
sorting.cpp:13:5: note: shadowed declaration is here
   13 | int N;
      |     ^
sorting.cpp:65:27: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   65 |         if (scambi.size() <= i) {
      |             ~~~~~~~~~~~~~~^~~~
sorting.cpp:96:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |         if (i >= scambi.size()) {
      |             ~~^~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

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

Subtask #2
12.0 / 12.0

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

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 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 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 5 ms 468 KB Output is correct
22 Correct 4 ms 468 KB Output is correct
23 Correct 5 ms 468 KB Output is correct
24 Correct 5 ms 468 KB Output is correct
25 Correct 3 ms 468 KB Output is correct
26 Correct 2 ms 448 KB Output is correct
27 Correct 3 ms 468 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 340 KB Output is correct
2 Correct 54 ms 416 KB Output is correct
3 Correct 49 ms 428 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 5 ms 340 KB Output is correct
7 Correct 19 ms 448 KB Output is correct
8 Correct 54 ms 460 KB Output is correct
9 Correct 55 ms 428 KB Output is correct
10 Correct 56 ms 428 KB Output is correct
11 Correct 42 ms 432 KB Output is correct
12 Correct 19 ms 436 KB Output is correct
13 Correct 40 ms 424 KB Output is correct
14 Correct 1 ms 340 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 340 KB Output is correct
2 Correct 54 ms 416 KB Output is correct
3 Correct 49 ms 428 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 5 ms 340 KB Output is correct
7 Correct 19 ms 448 KB Output is correct
8 Correct 54 ms 460 KB Output is correct
9 Correct 55 ms 428 KB Output is correct
10 Correct 56 ms 428 KB Output is correct
11 Correct 42 ms 432 KB Output is correct
12 Correct 19 ms 436 KB Output is correct
13 Correct 40 ms 424 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Execution timed out 1094 ms 8748 KB Time limit exceeded
16 Halted 0 ms 0 KB -