A rabbit is at, and its cave is at, 20 m north. A wolf is at, 33 m east of the rabbit: the wolf stared at the rabbit as quickly as the rabbit and asked if the rabbit would be caught before arriving at the hole?
Many people on the Internet say they can be caught up, including a similar question, which is 100 yards away from the rabbit and the hole is 60 yards away. So can we?
Through computer simulation, you can find the answer without solving the differential equation.
To simulate a computer, it
Memory Management1.listvmastatic void Mtest_dump_vma_list (void){struct Task_struct *task = current; Get the task_struct of the current processstruct Mm_struct *mm = task->mm;struct Vm_area_struct *vma; Get the VMA area of the current processint count = 0; The number of VMADown_read (mm->mmap_sem);for (VMA = mm->mmap; vma; VMA = vma->vm_next){count++;PRINTK ("%d:0x%lx 0x%lx", Count, Vma->vm_start, vma->vm_e
system call. In fact, we can define the error range by observing these system calls, their parameters, and return values, even find out the root cause of the problem.
In Linux, strace is such a tool. Through it, we can track system calls generated during program execution and receive signals to help us analyze exceptions encountered during program or command execution.
A simple example
How to use strace to track programs and view corresponding output? The following is an example.
1. Examples of
) using step description * Operating environment: Slackwarelinux 64bit */#include #include ///1, create a variable of type pthread_key_t typepthread_key_t key;voiddestructor (void*arg) {//arg is the stored thread data printf("destructor executed in thread%lx, param =%lx\n", Pthread_self (), Arg);}void* CHILD1 (void*arg) {pthread_t tid = pthread_self ();printf("Thread1%
If a single level score includes a score subkey, click on the score entry to pop up a new window with a list of all the rating subkeys for the current rating item, which is available for the user to manipulate. When the user is done, click OK to return to the parent form, all the results of the action in the subform, and take it to the parent form. Also, if the user clicks the rating item again, when the subform is popped, the result of the last action is bound to the corresponding action item.
transferred from: http://www.cnblogs.com/kuangbin/archive/2012/08/23/2653003.htmlone is calculated directly from the formula, and the other is two-point calculation. Both methods are fast, fully realize the high efficiency of the two points AH ~ ~ ~a very important condition in the title is (lx*lx+ly*ly) This means it must be able to catch up, and can be shot at the maximum distance, so the first question m
. In the future, designers can derive a large number of subcategories from the shape category and put objects into shapelist for use by assemblers.
Let's see how VB can be used to implement the UML pattern shown in Figure 2:
' Ex01.bas
Imports System.ComponentModel
Imports System.Drawing
Imports system.winforms
'-------------------------------------------------------------------------
Class Shape
Protected LX, ly as Integer
Public Sub SetXY (ByVal x
left and right endpoint l,r; Find two thirds points m1,m2 (lThis problem, first, the relationship is very easy to find, found to be a single-peak function, then three points to find the most value canBut here's the three-point set of three points, also very good understandingFor the outer three m1,m2, if the size of the comparison, it is necessary to make three points inside to determine, this is three points set three pointsCode#include #include#include#include#includeusing namespacestd;intRea
KM bare question
Each fish considers itself as a male and will attack the fish that it considers as a female. Each fish can only be attacked once, after being attacked, it will generate eggs (the number is the exclusive or operation of the value of the catfish)
The meaning of this question is not easy to understand ..
# Include # Include # Define n 110# Define INF 0x3fffffffInt map [N] [N], LX [N], Ly [N], SX [N], Sy [N], n, d [N], cont [N], Match [N]
addition, the page Directory table and page table are defined in pgtable. h as follows:
Externpgd_t swapper_pg_dir [1024];
Externunsigned long pg0 [2, 1024];
Swapper_pg_dir is a temporary page Directory table, which is statically initialized during kernel compilation. Pg0 is a temporary page table used during initialization.
2. Linear address domain definition
(1) number of digits of page offset# Define page_shift 12# Define page_size (1ul# Include
# Include
# Include
# In
If a level-1 score item contains a score item, a new window is displayed when you click this item. The new form lists all the score items of the current score item, for user operations. After the user completes the operation, click "OK" to return to the parent form. All the operation results in the child form must be taken to the parent form. If you click this score item again, bind the result of the last operation to the corresponding operation item while the subform is displayed.
The example
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