#include <vector>

/**
 * 2043. Simple Bank System
 *
 * 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 * The amount of money withdrawn or transferred from is less than or equal to the balance of the account.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.
 */

class Bank {
private:
	std::vector<long long> balance;
public:
	explicit Bank(std::vector<long long> b) : balance(std::move(b)) {}

	bool transfer(int a1, int a2, long long m) {
		if (a1 < 1 || a1 > balance.size() || a2 < 1 || a2 > balance.size() || balance[a1 - 1] < m)
			return false;
		balance[a1 - 1] -= m;
		balance[a2 - 1] += m;
		return true;
	}

	bool deposit(int a, long long m) {
		if (a >= 1 && a <= balance.size())
			balance[a - 1] += m;
		else
			return false;
		return true;
	}

	bool withdraw(int a, long long m) {
		if (a < 1 || a > balance.size() || balance[a - 1] < m)
			return false;
		balance[a - 1] -= m;
		return true;
	}
};