Simple Bank System.cpp

// https://leetcode.com/contest/weekly-contest-263/problems/simple-bank-system/
// Concept used : Hashing
class Bank {
public:
    vector <long long> v;
    Bank(vector<long long>& balance) {
        v = balance;
    }
    
    bool transfer(int account1, int account2, long long money) {
        if(account1<1 or account1>v.size()) return false;
        if(account2<1 or account2>v.size()) return false;
        if(v[account1-1]>=money){
            v[account1-1]-=money;
            v[account2-1]+=money;
            return true;
        }
        else return false;
    }
    
    bool deposit(int account, long long money) {
        if(account<1 or account>v.size()) return false;
        v[account-1]+=money;
        return true;
    }
    
    bool withdraw(int account, long long money) {
        if(account<1 or account>v.size()) return false;
        if(v[account-1]>=money){
            v[account-1]-=money;
            return true;
        }
        else 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);
 */