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<body>
<pre style="background-color:LightGray">
<code>
//注意：考虑结果是否会overflow
public class Solution {
//pay attention: return type <span style="background-color:green">is long type </span>
public long fibonacci(int K) {
//corner case: K < 0
if (K <= 0) {
<mark style="color:red">return 0;</mark>
}
if (K == 1) {
return 1;
}
//pay attention: a and b are long type.
long a = 0;
long b = 1;
for (int i = 2; i <= K; i++) {
//注意 temp的作用域，for循环外面temp无效，不能在程序的最后 return temp
long temp = a + b;
a = b;
b = temp;
}
return b;
}
}
//time complexity: O(K)
//space complexity: O(1)
</code>
</pre>
<pre>
<code>
<mark>Marked text</mark>
<span style="background-color: orange">Marked text</span>
<mark style="background-color: lightblue; color:red">Marked text</mark>
</code>
</pre>
</body>