Sorting books

#include <bits/stdc++.h>

using namespace std;

//Definitions for quicker writing
#define REP(i,a,b) for (int i = a; i < b; i++)

//Typedefs for quicker writing
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;



int main() {
	//IO optimization
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	//Input definition
    int n;
    cin >> n;
    ll books[n];

    for (int i = 0; i < n; ++i) cin >> books[i];

    ll res = 0;
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n - 1; j++) {
            if (books[j] > books[j + 1]) {
                swap(books[j], books[j + 1]);
                res++;
            }
        }
    }
	//Write out
    cout << res << "\n";

	//Return
    return 0;
}

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