412. Fizz Buzz
Tags:
Write a program that outputs the string representation of numbers from 1 to n.
But for multiples of three it should output “Fizz” instead of the number and for the multiples of five output “Buzz”. For numbers which are multiples of both three and five output “FizzBuzz”.
Example:
n = 15,
Return:
[
"1",
"2",
"Fizz",
"4",
"Buzz",
"Fizz",
"7",
"8",
"Fizz",
"Buzz",
"11",
"Fizz",
"13",
"14",
"FizzBuzz"
]
Solution
方法1： if else check
public List<String> fizzBuzz(int n) {
List<String> result = new ArrayList<>();
for (int i = 1; i <= n; i++) {
if (i % 3 == 0 && i % 5 == 0) {
result.add("FizzBuzz");
} else if (i % 3 == 0) {
result.add("Fizz");
} else if (i % 5 == 0) {
result.add("Buzz");
} else {
result.add(String.valueOf(i));
}
}
return result;
}
方法2： 更加通用，且对于两种情况只需要check两次，而不是三次
public List<String> fizzBuzz(int n) {
List<String> ans = new ArrayList<>();
for (int num = 1; num <= n; num++) {
boolean divisibleBy3 = (num % 3 == 0);
boolean divisibleBy5 = (num % 5 == 0);
String numAnsStr = "";
if (divisibleBy3) {
numAnsStr += "Fizz";
}
if (divisibleBy5) {
numAnsStr += "Buzz";
}
if (numAnsStr.equals("")) {
// Not divisible by 3 or 5, add the number
numAnsStr += String.valueOf(num);
}
// Append the current answer str to the ans list
ans.add(numAnsStr);
}
return ans;
}