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Minimum Swaps 2 C++ Solution

Minimum Swaps 2 C++ Solution

Beeze Aal
Beeze Aal
#include <bits/stdc++.h>

using namespace std;

vector<string> split_string(string);

vector<int>v[100003];
bool visit[100003];

// This function return the size of the cycle as mentioned in the explanation.
int dfs(int i)
{
    visit[i] = true;
    int z = 1;
    
    for(auto x: v[i])
        if(!visit[x])
            z += dfs(x);
            
    return z;  
}


int minimumSwaps(vector<int> A) {
    
    for(int i = 0; i < A.size(); ++i )
        v[i].push_back(A[i]-1), v[A[i]-1].push_back(i);
    
    int c = 0;

    for(int i = 0; i < A.size(); ++i)
    {
        if(!visit[i])
            c += dfs(i) - 1;
    }
    
    return c;
}
int main()
{
    ofstream fout(getenv("OUTPUT_PATH"));

    int n;
    cin >> n;
    cin.ignore(numeric_limits<streamsize>::max(), '\n');

    string arr_temp_temp;
    getline(cin, arr_temp_temp);

    vector<string> arr_temp = split_string(arr_temp_temp);

    vector<int> arr(n);

    for (int i = 0; i < n; i++) {
        int arr_item = stoi(arr_temp[i]);

        arr[i] = arr_item;
    }

    int res = minimumSwaps(arr);

    fout << res << "\n";

    fout.close();

    return 0;
}

vector<string> split_string(string input_string) {
    string::iterator new_end = unique(input_string.begin(), input_string.end(), [] (const char &x, const char &y) {
        return x == y and x == ' ';
    });

    input_string.erase(new_end, input_string.end());

    while (input_string[input_string.length() - 1] == ' ') {
        input_string.pop_back();
    }

    vector<string> splits;
    char delimiter = ' ';

    size_t i = 0;
    size_t pos = input_string.find(delimiter);

    while (pos != string::npos) {
        splits.push_back(input_string.substr(i, pos - i));

        i = pos + 1;
        pos = input_string.find(delimiter, i);
    }

    splits.push_back(input_string.substr(i, min(pos, input_string.length()) - i + 1));

    return splits;
}