1
class Bank {
2

3
  int N;
4
  long[] balance;
5

6
  public Bank(long[] balance) {
7
    this.N = balance.length;
8
    this.balance = balance;
9
  }
10

11
  public boolean transfer(int account1, int account2, long money) {
12
    if (account1 < 1
13
        || account1 > N
14
        || account2 < 1
15
        || account2 > N
16
        || balance[account1 - 1] < money) return false;
17
    balance[account1 - 1] -= money;
18
    balance[account2 - 1] += money;
19
    return true;
20
  }
21

22
  public boolean deposit(int account, long money) {
23
    if (account < 1 || account > N) return false;
24
    balance[account - 1] += money;
25
    return true;
26
  }
27

28
  public boolean withdraw(int account, long money) {
29
    if (account < 1 || account > N || balance[account - 1] < money) return false;
30
    balance[account - 1] -= money;
31
    return true;
32
  }
33
}