LintCode 1673 · Save Money.java

	public class Solution {
	/**
	* @param operations: the type of information
	* @param name: the name of user
	* @param w: the money need to save or take
	* @return: output the remaining money of the user.if the operation is illegal,output -1
	*/
	public int[] getAns(int[] operations, String[] names, int[] amounts) {
	// Write your code here
	if (operations == null || operations.length == 0) {
	return new int[0];
	}
	int n = operations.length;
	int[] result = new int[n];
	Map<String, Integer> name2Balance = new HashMap<>();
	for (int i = 0; i < n; i++) {
	int op = operations[i];
	String name = names[i];
	int amount = amounts[i];
	if (op == 0) {
	int balance = name2Balance.getOrDefault(name, 0) + amount;
	name2Balance.put(name, balance);
	result[i] = balance;
	} else {
	if (name2Balance.getOrDefault(name, 0) >= amount) {
	int balance = name2Balance.getOrDefault(name, 0) - amount;
	name2Balance.put(name, balance);
	result[i] = balance;
	} else {
	result[i] = -1;
	}
	}
	}
	return result;
	}
	}

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