CP_31_TLE_RATED_1100/C_Paint_the_Array.cpp at main · shivNcode/CP_31_TLE_RATED_1100 · GitHub

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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
#define endl '\n'
#define all(x) (x).begin(), (x).end()
#define rep(i, a, b) for (long long i = a; i < b; i++) // int -> long long
#define ll long long

void factorial(vector<ll>& arr , ll n){
    for(ll i = 2; i <= n/2; i++){
        if(n % i == 0) arr.push_back(i);
    }
    arr.push_back(n);
    return;
}
int gcd(int a , int b){
    if(a==0) return b;
    return gcd(b%a , a);
}

int main() {
    fastio;

    ll t;
    cin >> t;
    while (t--) {
        ll n;
        cin >> n;
        vector<ll> arr(n+1);
        ll odd = 0 , even = 0;
        for(ll i = 1; i <= n; i++){
            cin >> arr[i];
            if(i & 1) odd = gcd(odd , arr[i]);
            else even = gcd(even , arr[i]);
        }
        bool ans = true;
        bool check = true;
        if(even!=1){
            for(ll i=1;i<=n;i+=2){
            if(arr[i]%even==0){
                check = false;
                break;
            }
        }
        if(check){
             cout<<even<<endl;
             ans = false;
            }
        }
        if(odd!=1 && ans==true){
            check = true;
            for(ll i = 2;i<=n;i+=2){
            if(arr[i]%odd==0){
                check = false;
                break;
            }
        }
        if(check){
            ans = false;
            cout<<odd<<endl;}
        }
        if(ans){
            cout<<0<<endl;
        }

    }

    return 0;
}


/*
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
#define endl '\n'
#define all(x) (x).begin(), (x).end()
#define rep(i, a, b) for (long long i = a; i < b; i++) // int -> long long
#define ll long long

void factorial(vector<ll>& arr , ll n){
    for(ll i = 2; i <= n/2; i++){
        if(n % i == 0) arr.push_back(i);
    }
    arr.push_back(n);
    return;
}
int gcd(int a , int b){
    if(a==0) return b;
    return gcd(b%a , a)
}

int main() {
    fastio;

    ll t;
    cin >> t;
    while (t--) {
        ll n;
        cin >> n;
        vector<ll> arr(n+1);
        ll odd = 1e9 , even = 1e9;
        for(ll i = 1; i <= n; i++){
            cin >> arr[i];
            if(i & 1) odd = min(odd , arr[i]);
            else even = min(even , arr[i]);
        }
        vector<ll> fac1 , fac2;
        factorial(fac1 , odd);
        factorial(fac2 , even);

        bool ans = false;
        for(auto it : fac1){
            bool check = true;
            for(ll i = 1; i <= n; i += 2){
                if(arr[i] % it != 0){
                    check = false;
                    break;
                }
            }
            if(check){
                bool verify = true;
                for(ll i = 2; i <= n; i += 2){
                    if(arr[i] % it == 0){
                        verify = false;
                        break;
                    }
                }
                if(verify){
                    ans = true;
                    cout << it << endl;
                    break;
                }
            }
        }
        if(!ans){
            for(auto it : fac2){
                bool check = true;
                for(ll i = 2; i <= n; i += 2){
                    if(arr[i] % it != 0){
                        check = false;
                        break;
                    }
                }
                if(check){
                    bool verify = true;
                    for(ll i = 1; i <= n; i += 2){
                        if(arr[i] % it == 0){
                            verify = false;
                            break;
                        }
                    }
                    if(verify){
                        ans = true;
                        cout << it << endl;
                        break;
                    }
                }
            }
        }
        if(!ans) cout << 0 << endl;
    }

    return 0;
}

*/