Java 为什么UVa在线评委100(3n+;1)的方法A与方法B相比存在缺陷?
简单地从交换方法A更改为交换方法B,UVa法官从“错误答案”变为“接受”。为什么呢?我提前感谢大家的回答Java 为什么UVa在线评委100(3n+;1)的方法A与方法B相比存在缺陷?,java,int,swap,parseint,challenge-response,Java,Int,Swap,Parseint,Challenge Response,简单地从交换方法A更改为交换方法B,UVa法官从“错误答案”变为“接受”。为什么呢?我提前感谢大家的回答 import java.io.IOException; import java.util.StringTokenizer; /** * @author Coder47 * Another solution to 3n+1 (UVa ID: 100) */ class Main { public static int[] cache = new int[1000000];
import java.io.IOException;
import java.util.StringTokenizer;
/**
* @author Coder47
* Another solution to 3n+1 (UVa ID: 100)
*/
class Main {
public static int[] cache = new int[1000000];
static String ReadLn (int maxLg) // utility function to read from stdin
{
byte lin[] = new byte [maxLg];
int lg = 0, car = -1;
try
{
while (lg < maxLg)
{
car = System.in.read();
if ((car < 0) || (car == '\n')) break;
lin [lg++] += car;
}
}
catch (IOException e)
{
return (null);
}
if ((car < 0) && (lg == 0)) return (null); // eof
return (new String (lin, 0, lg));
}
public static void main(String[] args) {
Main myWork = new Main(); // create a dynamic instance
myWork.Begin(); // the true entry point
}
void Begin() {
String input;
StringTokenizer idata;
// corresponds to swap method A
int a, b, temp, cycle, cycleMax;
// corresponds to swap method B
// int a, b, min, max, cycle, cycleMax;
while ((input = Main.ReadLn(255)) != null)
{
idata = new StringTokenizer(input);
a = Integer.parseInt(idata.nextToken());
b = Integer.parseInt(idata.nextToken());
// swap method A
if (b < a) {
temp = a;
a = b;
b = temp;
}
// swap method B
// min = Math.min(a, b);
// max = Math.max(a, b);
cycleMax = 0;
// corresponds to swap method A
for (int i = a; i <= b; i++)
// corresponds to swap method B
// for ( int i = min; i <= max; i++)
{
cycle = calculateCycle(i);
if (cycle > cycleMax) {
cycleMax = cycle;
}
}
System.out.println (a + " " + b + " " + cycleMax);
}
}
public int calculateCycle(int n) {
return calculateCycleHelper(n, 1);
}
public int calculateCycleHelper(int n, int cycleNum) {
if (n == 1) {
return cycleNum;
} else {
return calculateCycleHelper(next(n), cycleNum + 1);
}
}
public int next(int n) {
if (n % 2 == 0) {
n = n/2;
}
else {
n = 3*n+1;
}
return n;
}
}
import java.io.IOException;
导入java.util.StringTokenizer;
/**
*@author Coder47
*3n+1的另一种解决方案(UVa ID:100)
*/
班长{
公共静态int[]缓存=新int[1000000];
静态字符串ReadLn(int-maxLg)//从stdin读取的实用函数
{
字节lin[]=新字节[maxLg];
int lg=0,car=-1;
尝试
{
while(lgif(a
表示的与您想要的相反。如果b
,您需要交换元素,因为在for循环中
for (int i = a; i <= b; i++)
改变了,所以法官不接受它。这是因为if(a
所说的与你想要的相反。如果b
,你需要交换元素,因为在for循环中
for (int i = a; i <= b; i++)
改变了,所以法官不接受它。这样,就确定了:我是个白痴。非常感谢!@Coder47不,我们都做过这样的事情!别忘了如果答案有用,你可以接受(勾选旁边的勾号)。事实上,不。我收回了。我错误地写出了上面的代码:即使是if(b