-
Notifications
You must be signed in to change notification settings - Fork 22
Expand file tree
/
Copy path2043.simple-bank-system.cpp
More file actions
94 lines (88 loc) · 3.8 KB
/
2043.simple-bank-system.cpp
File metadata and controls
94 lines (88 loc) · 3.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
// Tag: Array, Hash Table, Design, Simulation
// Time: O(1)
// Space: O(N)
// Ref: -
// Note: -
// Video: https://youtu.be/-ejSX-2Jznc
// You have been tasked with writing a program for a popular bank that will automate all its incoming transactions (transfer, deposit, and withdraw). The bank has n accounts numbered from 1 to n. The initial balance of each account is stored in a 0-indexed integer array balance, with the (i + 1)th account having an initial balance of balance[i].
// Execute all the valid transactions. A transaction is valid if:
//
// The given account number(s) are between 1 and n, and
// The amount of money withdrawn or transferred from is less than or equal to the balance of the account.
//
// Implement the Bank class:
//
// Bank(long[] balance) Initializes the object with the 0-indexed integer array balance.
// boolean transfer(int account1, int account2, long money) Transfers money dollars from the account numbered account1 to the account numbered account2. Return true if the transaction was successful, false otherwise.
// boolean deposit(int account, long money) Deposit money dollars into the account numbered account. Return true if the transaction was successful, false otherwise.
// boolean withdraw(int account, long money) Withdraw money dollars from the account numbered account. Return true if the transaction was successful, false otherwise.
//
//
// Example 1:
//
// Input
// ["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"]
// [[[10, 100, 20, 50, 30]], [3, 10], [5, 1, 20], [5, 20], [3, 4, 15], [10, 50]]
// Output
// [null, true, true, true, false, false]
//
// Explanation
// Bank bank = new Bank([10, 100, 20, 50, 30]);
// bank.withdraw(3, 10); // return true, account 3 has a balance of $20, so it is valid to withdraw $10.
// // Account 3 has $20 - $10 = $10.
// bank.transfer(5, 1, 20); // return true, account 5 has a balance of $30, so it is valid to transfer $20.
// // Account 5 has $30 - $20 = $10, and account 1 has $10 + $20 = $30.
// bank.deposit(5, 20); // return true, it is valid to deposit $20 to account 5.
// // Account 5 has $10 + $20 = $30.
// bank.transfer(3, 4, 15); // return false, the current balance of account 3 is $10,
// // so it is invalid to transfer $15 from it.
// bank.withdraw(10, 50); // return false, it is invalid because account 10 does not exist.
//
//
// Constraints:
//
// n == balance.length
// 1 <= n, account, account1, account2 <= 105
// 0 <= balance[i], money <= 1012
// At most 104 calls will be made to each function transfer, deposit, withdraw.
//
//
class Bank {
public:
vector<long long> bal;
Bank(vector<long long>& balance) {
swap(bal, balance);
}
bool transfer(int account1, int account2, long long money) {
int n = bal.size();
if (account1 <= n && account2 <= n && bal[account1 - 1] >= money) {
bal[account1 - 1] -= money;
bal[account2 - 1] += money;
return true;
}
return false;
}
bool deposit(int account, long long money) {
int n = bal.size();
if (account <= n) {
bal[account - 1] += money;
return true;
}
return false;
}
bool withdraw(int account, long long money) {
int n = bal.size();
if (account <= n && bal[account - 1] >= money) {
bal[account - 1] -= money;
return true;
}
return false;
}
};
/**
* Your Bank object will be instantiated and called as such:
* Bank* obj = new Bank(balance);
* bool param_1 = obj->transfer(account1,account2,money);
* bool param_2 = obj->deposit(account,money);
* bool param_3 = obj->withdraw(account,money);
*/