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AlgorithmCode
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image
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TodayCoding0519.java
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TodayCoding0519.java
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public
class
TodayCoding0519
{
public
static
void
main
(
String
[]
args
) {
}
/**
* 题目6
* 使用位运算实现加减乘除。
* 参考:系统最小值无法实现绝对值。
* Integer.MIN_VALUE - 1 == Integer.MAX_VALUE
* Integer.MAX_VALUE + 1 == Integer.MIN_VALUE
*/
public
static
int
bitAdd
(
int
a
,
int
b
) {
int
sum
=
0
;
while
(
b
!=
0
) {
sum
=
a
^
b
;
b
= (
a
&
b
) <<
1
;
a
=
sum
;
}
return
sum
;
}
/**
* 取相反数
* @param n
* @return
*/
public
static
int
negNum
(
int
n
) {
return
bitAdd
(~
n
,
1
);
}
/**
* 位运算实现N皇后问题加速。
*/
/**
* 动态规划:把多阶段过程转化为一系列单阶段问题,
* 利用各阶段之间的关系,逐个求解,创立了解决这类过程优化问题的新方法——动态规划。
* 1 暴力递归。
* 2 记忆化搜索。
* 3 动态规划。
* 题目 17:
* 给定一个整数N,求由"0"字符与"1"字符组成为N的所有字符串中,满足"0"字符的左边必有"1"字符的
* 字符串数量。
* 题目附加:走楼梯问题最佳时间复杂度:O(logN)。
* 空间压缩:二维问题只使用一个数组。
*/
}
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