1732A - Bestie - CodeForces Solution

constructive algorithms math

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Python Code: 

import math
for _ in range(int(input())):
    n = int(input());l = list(map(int, input().split()))
    d = 0
    for i in l:d = math.gcd(d, i)
    if d == 1:print(0)
    elif math.gcd(d, n) == 1:print(1)
    elif math.gcd(d, n-1) == 1:print(2)
    else:print(3)

C++ Code: 

#include <bits/stdc++.h>
using namespace std;

void solve()
{
    int n;
    cin >> n;

    vector<int> a(n + 1, 0);

    cin >> a[1];

    int g = a[1];

    for (int i = 2; i <= n; i++)
    {
        cin >> a[i];
        g = __gcd(g, a[i]);
    }

    if (g == 1)
    {
        cout << 0 << endl;
        return;
    }

    for (int i = n; i >= n - 1; i--)
    {
        if (__gcd(i, g) == 1)
        {
            cout << n - i + 1 << endl;
            return;
        }
    }

    cout << 3 << endl;
}

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        solve();
    }
}


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