matlab求解最优化问题!!!!!第十题!!

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求第十五题!&
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a^2b^2-2ab+a^2+b^2-2ab+1=0(ab-1)^2+(a-b)^2=0ab=1,a=b所以a=b=1或a=b=-1.
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扫描下载二维码双曲线题目 求解!!第十题!【高二数学吧】_百度贴吧
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双曲线题目 求解!!第十题!收藏
B2/A=a+c. 所以e=2
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求解第十题的方法收藏
这题我做过 不a就d
登录百度帐号推荐应用Regular Expression Matching
Implement regular expression matching with support for '.' and '*'.
'.' Matches any single character.
'*' Matches zero or more of the preceding element.
The matching should cover the entire input string (not partial).
The function prototype should be:
bool isMatch(const char *s, const char *p)
Some examples:
isMatch(&aa&,&a&) return false
isMatch(&aa&,&aa&) return true
isMatch(&aaa&,&aa&) return false
isMatch(&aa&, &a*&) return true
isMatch(&aa&, &.*&) return true
isMatch(&ab&, &.*&) return true
isMatch(&aab&, &c*a*b&) return true
这里面,动态规划,以及递归的思想很重要
First of all, this is one of the most difficulty problems. It is hard to think through all different cases. The problem should be simplified to handle 2 basic cases:
the second char of pattern is &*&the second char of pattern is not &*&
For the 1st case, if the first char of pattern is not &.&, the first char of pattern and string should be the same. Then continue to match the remaining part.
For the 2nd case, if the first char of pattern is &.& or first char of pattern == the first i char of string, continue to match the remaining part.
public boolean isMatch(String s, String p) {
// base case
if (p.length() == 0) {
return s.length() == 0;
// special case
if (p.length() == 1) {
// if the length of s is 0, return false
if (s.length() & 1) {
//if the first does not match, return false
else if ((p.charAt(0) != s.charAt(0)) && (p.charAt(0) != '.')) {
// otherwise, compare the rest of the string of s and p.
return isMatch(s.substring(1), p.substring(1));
// case 1: when the second char of p is not '*'
if (p.charAt(1) != '*') {
if (s.length() & 1) {
if ((p.charAt(0) != s.charAt(0)) && (p.charAt(0) != '.')) {
return isMatch(s.substring(1), p.substring(1));
// case 2: when the second char of p is '*', complex case.
//case 2.1: a char & '*' can stand for 0 element
if (isMatch(s, p.substring(2))) {
//case 2.2: a char & '*' can stand for 1 or more preceding element,
//so try every sub string
int i = 0;
while (i&s.length() && (s.charAt(i)==p.charAt(0) || p.charAt(0)=='.')){
if (isMatch(s.substring(i + 1), p.substring(2))) {
大神解答网址:/2012/12/leetcode-regular-expression-matching-in-java/
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(2)(1)(1)(1)(6)(2)(1)(6)(7)求解第十题【数学吧】_百度贴吧
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