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Make it Divisible - ALLDIV3.cpp
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Make it Divisible - ALLDIV3.cpp
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// https://www.codechef.com/COOK135B/problems/ALLDIV3
/*
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██╔════╝██╔══██╗██╔══██╗██╔══██╗██╔════╝██║░░██║ ██╔════╝░██║░░░██║██╔══██╗╚══██╔══╝██╔══██╗
╚█████╗░██████╔╝███████║██████╔╝╚█████╗░███████║ ██║░░██╗░██║░░░██║██████╔╝░░░██║░░░███████║
░╚═══██╗██╔═══╝░██╔══██║██╔══██╗░╚═══██╗██╔══██║ ██║░░╚██╗██║░░░██║██╔═══╝░░░░██║░░░██╔══██║
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╚═════╝░╚═╝░░░░░╚═╝░░╚═╝╚═╝░░╚═╝╚═════╝░╚═╝░░╚═╝ ░╚═════╝░░╚═════╝░╚═╝░░░░░░░░╚═╝░░░╚═╝░░╚═╝
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗█████╗
╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝╚════╝
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
*/
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(x) x.begin(), x.end()
#define ll long long
#define pll pair<ll, ll>
#define vll vector<long long>
#define inf 1e18
#define gcd(a, b) __gcd(a, b)
#define range(a,b) substr(a,b-a+1)
#define fori(a, n) for (ll i = a; i < n; i++)
#define forj(a, n) for (ll j = a; j < n; j++)
#define fork(a, n) for (ll k = a; k < n; k++)
#define print(x) for (auto i : x) {cout << i << " ";}
#define FIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
template <class T>
bool comp(T a, T b) {
if (a < b)
return true;
return false;
}
int main()
{
FIO;
#ifndef ONLINE_JUDGE
//remove this piece of code when this has to be submitted in kickstart, coding ninjas
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
//freopen is used to associate a file with stdin or stdout stream in C++
#endif
ll t;
cin >> t;
while (t--) {
ll n, temp, count_1 = 0, count_2 = 0, count_3 = 0, suma = 0;
cin >> n;
vll arr(n);
fori(0, n) {
cin >> temp;
arr[i] = temp % 3;
if (arr[i] == 0)
count_3++;
else if (arr[i] == 1)
count_1++;
else
count_2++;
suma += arr[i];
}
if (count_1 == count_2)
cout << count_1 << "\n";
else if (suma % 3 != 0)
cout << -1 << "\n";
else {
ll mina = min(count_1, count_2);
count_1 -= mina;
count_2 -= mina;
if (count_1 == 0 && count_2 == 0)
cout << 0 << "\n";
else if (count_1 == 0 || count_2 == 0) {
if ((count_1 + count_2) % 3 == 0)
cout << mina + 2 * ((count_1 + count_2) / 3) << "\n";
else
cout << -1 << "\n";
}
}
}
return 0;
}