qui hoach dong

#include<iostream>
using namespace std;
void main() {
    int j, n, x1, x2;
    cin >> n;
    int *arr = new int[n];

    for (int i = 0; i < n; i++) {
        cin >> arr[i];
    }
    int s = 1, s0 = 1;
    for (int i = 0; i < n-1; i++) {
        int k = arr[i + 1] - arr[i], s1 = 1;
        for (j = i + 1; j <= n; j++) {
            if (arr[j] - arr[j-1] != k) break;
            else s1++;
        }
        if (s1 > s) { s = s1; x1 = j; }
    }
    cout << "day con CSC dai nhat co do dai = " << s << endl;
    while (s > 0) {
        cout << arr[x1 - s];
        s--;
    }
    cout << endl;
    for (int i = 0; i < n - 1; i++) {
        int s2 = 1;
        for (j = i + 1; j <= n; j++) {
            if (arr[j] < arr[j - 1] ) break;
            else s2++;
        }
        if (s2 > s0) { s0 = s2; x2 = j; }
    }
    cout << " day con tang dai nhat la= " << s0 << endl;
    while (s0 > 0) {
        cout << arr[x2 - s0];
        s0--;
    }
    system("pause");
}