Problema
A year divisible by 4 is a leap year unless it is also divisible by 100. Years divisible by 400 are leap years despite that exception. Apply this arithmetic rule to every allowed input year.
Implement leap_year(year).
Input
year: The year to check.
Output
Return true for a leap year and false otherwise.
Vincoli
1 ≤ year ≤ 9999.
Esempi
Input:
year = 2024
Output atteso:
expected = TrueInput:
long long year = 2024;
Output atteso:
bool expected = true;Input:
long year = 2024;
Output atteso:
bool expected = true;Spiegazione
2024 is divisible by 4 and not by 100.
Input:
year = 2100
Output atteso:
expected = FalseInput:
long long year = 2100;
Output atteso:
bool expected = false;Input:
long year = 2100;
Output atteso:
bool expected = false;Spiegazione
2100 is divisible by 100 but not by 400, so the century exception applies.
Come affrontarlo
Prova prima da solo, poi apri un suggerimento alla volta.
Suggerimento 1
Most years follow the divisible-by-4 rule, but centuries are exceptions.
Suggerimento 2
A year divisible by 400 is still a leap year, even though it is also divisible by 100.
Suggerimento 3
Check the exception before rejecting century years, or you may misclassify years like 2000.
Complessità attesa
O(1) time, O(1) extra space
Riferimenti
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