Python Arena

Merge Totals

This operation is common in statistics, such as combining sales or views from two sources. Write a function merge_sum that receives two dictionaries with numeric values and returns a new merged dictionary. If a key appears in both dictionaries, add its values together. If a key appears in only one dictionary, copy that value into the result.

Примеры

Ввод
{"a": 1, "b": 2}, {"b": 3, "c": 4}
Вывод
{"a": 1, "b": 5, "c": 4}
Ввод
{}, {}
Вывод
{}
Ввод
{"x": 1}, {}
Вывод
{"x": 1}

Нужно реализовать

def merge_sum(a: dict, b: dict) -> dict:

Теги

dicthashmap
PostgreSQLv16
Logi sisse, et esitada

Siia ilmub koodi käivituse tulemus

Visible tests
1
Input
{"a":1,"b":2}, {"b":3,"c":4}
Expected{"a":1,"b":5,"c":4}
2
Input
{}, {}
Expected{}
3
Input
{"x":1}, {}
Expected{"x":1}
4
Input
{}, {"y":2}
Expected{"y":2}
5
Input
{"a":5}, {"a":5}
Expected{"a":10}
6
Input
{"p":1,"q":2}, {"q":2,"r":3}
Expected{"p":1,"q":4,"r":3}
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