Python Arena

Merge Counts

Dictionaries are often used for counting, such as products sold by category or points earned by players. Write a function merge_sum that receives two dictionaries a and b with numeric values and merges them into a new dictionary. If a key appears in both dictionaries, add the values together. If a key appears in only one dictionary, copy its value into the result.

Примеры

Ввод
{"x": 1, "y": 2}, {"y": 3, "z": 4}
Вывод
{"x": 1, "y": 5, "z": 4}
Ввод
{}, {"a": 1}
Вывод
{"a": 1}
Ввод
{"a": 1}, {}
Вывод
{"a": 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
{"x":1,"y":2}, {"y":3,"z":4}
Expected{"x":1,"y":5,"z":4}
2
Input
{}, {"a":1}
Expected{"a":1}
3
Input
{"a":1}, {}
Expected{"a":1}
4
Input
{"a":1,"b":2}, {"a":10,"b":20}
Expected{"a":11,"b":22}
5
Input
{}, {}
Expected{}
6
Input
{}, {"a":10,"b":20}
Expected{"a":10,"b":20}
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