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class Solution {
public:
bool isMatch(const char *s, const char *p) {
int ls = strlen(s);
int lp = strlen(p);
if (lp == 0) {
if (ls != 0) return false;
else return true;
}
if (lp >= 2 && p[1] == '*') {
...
class Solution {
public:
vector<vector<int> > fourSum(vector<int> &num, int target) {
sort(num.begin(),num.end());
vector<vector<int> > res;
int* a = &num[0];
int len = num.size();
for (int i = 0; i ...
Given a linked list, remove the nth node from the end of list and return its head.
For example,
Given linked list: 1->2->3->4->5, and n = 2.
After removing the second node from the end, the linked list becomes 1->2->3->5.
Note:Given n will always be valid.Try to do ...
Given a string containing just the characters '(', ')', '{', '}', '[' and
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
For example, given n = 3, a solution set is:
"((()))", "(()())", "(())()", "()(())", "()()()"
class Solution {
public:
vector<string&g ...
class Solution {
public:
ListNode *swapPairs(ListNode *head) {
if (head == NULL || head->next == NULL) return head;
ListNode* newhead = head->next;
ListNode* prev = NULL, *cur1 = head, *cur2 = head->next;;
prev = cur1;
cur1->next = cu ...
Spiral Matrix II
Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.
For example,Given n = 3,
You should return the following matrix:
[
[ 1, 2, 3 ],
[ 8, 9, 4 ],
[ 7, 6, 5 ]
]
class Solution {
public:
vector<vector<int> > gen ...
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode *rotateRight(ListNode *head, int k) {
ListNode* tail = NULL;
int l ...
class Solution {
public:
int uniquePaths(int m, int n) {
int dp[m+1][n+1];
memset(dp, 0, sizeof(dp));
dp[0][0] = 1;
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
if (i > 0) dp[i][j] += dp[i-1][j]; ...
刷题，练习手感！
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode *mergeTwoLists(ListNode *l1, ListNode *l2) {
if (l1 == NULL) return l2 ...
Add Binary
Given two binary strings, return their sum (also a binary string).
For example,a = "11"b = "1"Return "100".
class Solution {
public:
string addBinary(string a, string b) {
int la = a.size(), lb = b.size();
int len = max(la, lb) + 2; ...
Search in Rotated Sorted Array
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).
You are given a target value to search. If found in the array return its index, otherwise return -1.
You may assume no duplicate exists in ...
Given n, generate all structurally unique BST's (binary search trees) that store values 1...n.
For example,Given n = 3, your program should return all 5 unique BST's shown below.
1 3 3 2 1
\ / / / \ \
3 2 1 1 3 2
/ ...
Given a number represented as an array of digits, plus one to the number.
水题，练手感。
class Solution {
public:
vector<int> plusOne(vector<int> &digits) {
int *a = new int[digits.size()+1];
memset(a, 0, digits.size()+1);
int ret = 1, cur = 0;
fo ...
Implement int sqrt(int x).
Compute and return the square root of x.
class Solution {
public:
int sqrt(int x) {
int l = 0, r = 46340;
if (r*r <= x) return r;
while (l < r) {
if (r - l < 2) {
if (r*r == x) return r;
...