Problema
The absolute value of a number is its distance from zero. Compute it with an if statement instead of a built-in abs function.
Implement absolute_value(n).
Input
n: Any integer.
Output
Return n if it is zero or positive, otherwise -n.
Vincoli
-1,000,000,000 ≤ n ≤ 1,000,000,000
Esempi
Esempio 1
Input:
n = -42
Output atteso:
expected = 42Input:
long long n = -42;
Output atteso:
long long expected = 42;Input:
long n = -42;
Output atteso:
long expected = 42;Spiegazione
-42 is negative, so the answer is 42.
Esempio 2
Input:
n = 15
Output atteso:
expected = 15Input:
long long n = 15;
Output atteso:
long long expected = 15;Input:
long n = 15;
Output atteso:
long expected = 15;Spiegazione
15 is already positive, so it stays 15.
Come affrontarlo
Prova prima da solo, poi apri un suggerimento alla volta.
Suggerimento 1
A number is unchanged if it is already nonnegative.
Suggerimento 2
Only negative values need to be flipped to their opposite.
Suggerimento 3
Zero should stay zero, so treat it with the nonnegative case.
Complessità attesa
O(1) time, O(1) extra space
Riferimenti
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