func_code_string: #include <bits/stdc++.h>   using namespace std;   string multiply(string num1, string num2) {     int len1 = num1.size();     int len2 = num2.size();     if (len1 == 0 || len2 == 0) return  0 ;     vector<int> result(len1 + len2, 0);     int i_n1 = 0;     int i_n2 = 0;     for (int i = len1 - 1; i >= 0; i--) {       int carry = 0;       int n1 = num1[i] -  0 ;       i_n2 = 0;       for (int j = len2 - 1; j >= 0; j--) {         int n2 = num2[j] -  0 ;         int sum = n1 * n2 + result[i_n1 + i_n2] + carry;         carry = sum / 10;         result[i_n1 + i_n2] = sum % 10;         i_n2++;       }       if (carry > 0) result[i_n1 + i_n2] += carry;       i_n1++;     }     int i = result.size() - 1;     while (i >= 0 && result[i] == 0) i--;     if (i == -1) return  0 ;     string s =   ;     while (i >= 0) s += std::to_string(result[i--]);     return s;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int T;     cin >> T;     while (T--) {       long int n;       cin >> n;       n = n / 2;       string n1, n2, n3, ans1, ans;       int temp;       if (n % 3 == 0) {         temp = 4 * n / 3;         n1 = to_string(temp);         n2 = to_string(n + 1);         n3 = to_string(2 * n + 1);         ans1 = multiply(n1, n2);         ans = multiply(ans1, n3);       } else if (n % 3 == 2) {         temp = 4 * (n + 1) / 3;         n1 = to_string(temp);         n2 = to_string(n);         n3 = to_string(2 * n + 1);         ans1 = multiply(n1, n2);         ans = multiply(ans1, n3);       } else {         temp = 4 * (2 * n + 1) / 3;         n1 = to_string(temp);         n2 = to_string(n + 1);         n3 = to_string(n);         ans1 = multiply(n1, n2);         ans = multiply(ans1, n3);       }       cout << ans << endl;     }   }   