dodola

  long total=Runtime.getRuntime().totalMemory();//获取系统内存总数
	long free=Runtime.getRuntime().freeMemory();//获取剩余内存
	long used=total-free;//获取已使用内存

dodola

Resources res=getResources();
TypedArray icons =res.obtainTypedArray(R.array.icons);
Drawable drawable1=icons.getDrawable(0);
Drawable drawable2=icons.getDrawable(1);
Drawable drawable3=icons.getDrawable(2);

dodola

#include <stdio.h>
int getchar( void );               //读取一个字符, 一般用来去掉无用字符
char *gets( char *str );          //读取一行字符串

#include <stdlib.h>
void * malloc( size_t size );     //动态内存分配, 开辟大小为 size 的空间
void qsort( void *buf, size_t num, size_t size, int (*compare)(const void *, const void *) );                    //快速排序
Sample:
int compare_ints( const void* a, const void* b ) 
{

dodola

#include<iostream>
using namespace std;

bool bin_search(int nums[],int i,int len){
    int left=0,right=len-1,middle;
    while(left<=right){
        middle=left+((right-left)>>1);
        if(i>nums[middle]){
            left=middle+1;
        }else if(i<nums[middle]){

dodola

#define MAXN 9999
#define DLEN 4
class BigNum {
private:
    int a[1000];//可以控制大数的位数
    int len; //大数长度
public:
    BigNum() {len = 1;memset(a,0,sizeof(a));}
    BigNum(const int);
    BigNum(const char*);

dodola

ACM大量习题题库 

ACM大量习题题库 
现在网上有许多题库，大多是可以在线评测，所以叫做Online Judge。除了USACO是为IOI准备外，其余几乎全部是大学的ACM竞赛题库。

USACO

http://ace.delos.com/usacogate

美国著名在线题库，专门为信息学竞赛选手准备

dodola

Cursor query = this.getContentResolver().query(ContactsContract.Data.CONTENT_URI, new String[] { ContactsContract.Data._ID, ContactsContract.CommonDataKinds.Phone.LABEL, ContactsContract.CommonDataKinds.Phone.NUMBER }, "", null, "");
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, query, new String[] { ContactsContract.CommonDataKinds.Phone.LABEL, ContactsContract.CommonDataKinds.Phone.NUMBER }, new int[] { android.R.id.text1, android.R.id.text2 }, 0);
mListView.setAdapter(adapter);

dodola

import java.util.Observable;
import java.util.Observer;
/*
 * Java 观察者模式示例
 */
class MyDataObservable extends Observable {
  private String data;

	public String getData() {

dodola

#encoding: utf-8

__author__ = 'Dodola'
from lxml.html import parse
from time import sleep,ctime
import time
import urllib.request
import threading
import contextlib
import queue

dodola

public class QuickSort {

  public static int partition(int[] nums, int p, int r) {
		int x = nums[r];// 取最后一位作为基准
		int i = p - 1;

		for (int j = p; j < r; j++) {
			if (nums[j] <= x) {
				i++;
				// 交换