Problema
JSON is the text format most programs use to exchange data. A JSON object is written as {"key": "value", ...}.
Given matching lists of keys and values (all text), build the JSON object string in this exact format:
- Start with
{and end with}. - Write each pair as
"key": "value", in the given order, separated by,(comma and space). - Inside a string, write a backslash
\as\\and a double quote"as\". Other characters stay as they are.
Implement json_object_string(keys, values).
Input
keys, values: Lists of the same length.
Output
Return the JSON text. An empty object is {}.
Vincoli
0 ≤ number of pairs ≤ 100
Keys and values have at most 50 printable characters
Esempi
Input:
keys = ["name", "city"]
values = ["Ada", "London"]
Output atteso:
expected = "{\"name\": \"Ada\", \"city\": \"London\"}"Input:
std::vector<std::string> keys = {"name", "city"};
std::vector<std::string> values = {"Ada", "London"};
Output atteso:
std::string expected = "{\"name\": \"Ada\", \"city\": \"London\"}";Input:
string[] keys = new string[] {"name", "city"};
string[] values = new string[] {"Ada", "London"};
Output atteso:
string expected = "{\"name\": \"Ada\", \"city\": \"London\"}";Spiegazione
Each pair becomes "key": "value": {"name": "Ada", "city": "London"}.
Input:
keys = ["quote"]
values = ["say \"hi\""]
Output atteso:
expected = "{\"quote\": \"say \\\"hi\\\"\"}"Input:
std::vector<std::string> keys = {"quote"};
std::vector<std::string> values = {"say \"hi\""};
Output atteso:
std::string expected = "{\"quote\": \"say \\\"hi\\\"\"}";Input:
string[] keys = new string[] {"quote"};
string[] values = new string[] {"say \"hi\""};
Output atteso:
string expected = "{\"quote\": \"say \\\"hi\\\"\"}";Spiegazione
The quotes inside the value are escaped with a backslash: {"quote": "say \"hi\""}.
Come affrontarlo
Prova prima da solo, poi apri un suggerimento alla volta.
Suggerimento 1
Build each "key": "value" pair separately, then join them.
Suggerimento 2
Escape backslashes before quotes so you don't escape your own escapes.
Suggerimento 3
An empty input still needs the braces: {}.
Complessità attesa
O(total length) time, O(total length) extra space
Riferimenti
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