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  • Project Euler #290 in python, hint please

    - by debragail
    This solution is grossly inefficient. What am I missing? #!/usr/bin/env python #coding: utf-8 import time from timestrings import * start = time.clock() maxpower = 18 count = 0 for i in range(0, 10 ** maxpower - 1): if i % 9 == 0: result1 = list(str(i)) result2 = list(str(137 * i)) sum1 = 0 for j in result1: sum1 += int(j) sum2 = 0 for j in result2: sum2 += int(j) if sum1 == sum2: print (i, sum1) count += 1 finish = time.clock() print ("Project Euler, Project 290") print () print ("Answer:", count) print ("Time:", stringifytime(finish - start))

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  • O(log n) algorithm to find the element having rank i in union of pre-sorted lists

    - by Eternal Learner
    Given two sorted lists, each containing n real numbers, is there a O(log?n) time algorithm to compute the element of rank i (where i coresponds to index in increasing order) in the union of the two lists, assuming the elements of the two lists are distinct? I can think of using a Merge procedure to merge the 2 lists and then find the A[i] element in constant time. But the Merge would take O(n) time. How do we solve it in O(log n) time?

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  • Is there a way to turn on some sort of JVM logging so I can see whats happening during classloading

    - by Spines
    I'm trying to optimize the startup time/class loading time of my Java web app because its on the Google App Engine and startup time is important. Is there a way I can turn on some sort of class loading debug messages or someway to see where time is being spent while class loading? I want to see if any specific libraries take a while to load and then get rid of them if they aren't essential.

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  • Dump Linq-To-Sql now that Entity Framework 4.0 has been released?

    - by DanM
    The relative simplicity of Linq-To-Sql as well as all the criticism leveled at version 1 of Entity Framework (especially, the vote of no confidence) convinced me to go with Linq-To-Sql "for the time being". Now that EF 4.0 is out, I wonder if it's time to start migrating over to it. Questions: What are the pros and cons of EF 4.0 relative to Linq-To-Sql? Is EF 4.0 finally ready for prime time? Is now the time to switch over?

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  • Configure spanning tree from HP to Cisco hardware

    - by Tim Brigham
    I have three switches I'd like to configure in a loop - a Cisco stack (3750s) and two HP 2900 series. Each is connected to the next with a 10 gig backplane of one form or another. How do I configure the spanning tree on these systems to make this function correctly? From the documents I've looked at it looks like I need to set both sets of hardware to use MST mode but I'm not sure past that point. The trunking, etc is all set up as needed. HP Switch 1 A4 connected to Cisco 1/0/1. HP Switch 2 B2 connected to Cisco 2/0/1. HP Switch 1 A2 connected to HP Switch 2 A1. HP Switch 1 show spanning-tree Multiple Spanning Tree (MST) Information STP Enabled : Yes Force Version : MSTP-operation IST Mapped VLANs : 1-4094 Switch MAC Address : 0021f7-126580 Switch Priority : 32768 Max Age : 20 Max Hops : 20 Forward Delay : 15 Topology Change Count : 352,485 Time Since Last Change : 2 secs CST Root MAC Address : 0018ba-c74268 CST Root Priority : 1 CST Root Path Cost : 200000 CST Root Port : 1 IST Regional Root MAC Address : 0021f7-126580 IST Regional Root Priority : 32768 IST Regional Root Path Cost : 0 IST Remaining Hops : 20 Root Guard Ports : TCN Guard Ports : BPDU Protected Ports : BPDU Filtered Ports : PVST Protected Ports : PVST Filtered Ports : | Prio | Designated Hello Port Type | Cost rity State | Bridge Time PtP Edge ----- --------- + --------- ---- ---------- + ------------- ---- --- ---- ... A1 | Auto 128 Disabled | A2 10GbE-CX4 | 2000 128 Forwarding | 0021f7-126580 2 Yes No A3 10GbE-CX4 | Auto 128 Disabled | A4 10GbE-SR | 2000 128 Forwarding | 0021f7-126580 2 Yes No HP Switch 2 show spanning-tree Multiple Spanning Tree (MST) Information STP Enabled : Yes Force Version : MSTP-operation IST Mapped VLANs : 1-4094 Switch MAC Address : 0024a8-cd6000 Switch Priority : 32768 Max Age : 20 Max Hops : 20 Forward Delay : 15 Topology Change Count : 19,623 Time Since Last Change : 32 secs CST Root MAC Address : 0018ba-c74268 CST Root Priority : 1 CST Root Path Cost : 202000 CST Root Port : A1 IST Regional Root MAC Address : 0024a8-cd6000 IST Regional Root Priority : 32768 IST Regional Root Path Cost : 0 IST Remaining Hops : 20 Root Guard Ports : TCN Guard Ports : BPDU Protected Ports : BPDU Filtered Ports : PVST Protected Ports : PVST Filtered Ports : | Prio | Designated Hello Port Type | Cost rity State | Bridge Time PtP Edge ----- --------- + --------- ---- ---------- + ------------- ---- --- ---- ... A1 10GbE-CX4 | 2000 128 Forwarding | 0021f7-126580 2 Yes No A2 10GbE-CX4 | Auto 128 Disabled | B1 SFP+SR | 2000 128 Blocking | a44c11-a67c80 2 Yes No B2 | Auto 128 Disabled | Cisco Stack 1 show spanning-tree ... (additional VLANs) VLAN0100 Spanning tree enabled protocol ieee Root ID Priority 1 Address 0018.bac7.426e Cost 2 Port 107 (TenGigabitEthernet2/1/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32868 (priority 32768 sys-id-ext 100) Address a44c.11a6.7c80 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec Interface Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- Te1/1/1 Desg FWD 2 128.53 P2p Te2/1/1 Root FWD 2 128.107 P2p

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  • Collision point of 2 curves in a 3d-room

    - by Frank
    Hello, i am programming a small game for quite some time. We started coding a small FPS-Shooter inside of a project at school to get a bit experience using directX. I dont know why, but i couldnt stop the project and started programming at home aswell. At the moment i am trying to create some small AI. Of cause thats definatlly not easy, but thats my personal goal anyways. The topic could prolly fill multiple books hehe. I've got the walking part of my bots done so far. They walk along a scriped path. I am not working on the "aiming" of the bots. While programming that i hit on some math problem i couldnt solve yet. I hope of your input on this to help me get further. Concepts, ideas and everything else are highly appreciated. Problem: Calculate the position (D3DXVECTOR3) where the curve of the projectile (depends on gravity, speed), hit the curved of the enemys walking path (depends on speed). We assume that the enemy walks in a constant line. Known variables: float projectilSpeed = 2000 m/s //speed of the projectile per second float gravitation = 9.81 m/s^2 //of cause the gravity lol D3DXVECTOR3 targetPosition //position of the target stored in a vector (x,y,z) D3DXVECTOR3 projectilePosition //position of the projectile D3DXVECTOR3 targetSpeed //stores the change of the targets position in the last second Variabledefinition ProjectilePosition at time of collision = ProjectilePos_t TargetPosition at time of collision = TargetPos_t ProjectilePosition at time 0, now = ProjectilePos_0 TargetPosition at time 0, now = TargetPos_0 Time to impact = t Aim-angle = theta My try: Found a formular to calculate "drop" (Drop of the projectile based on the gravity) on Wikipedia: float drop = 0.5f * gravity * t * t The speed of the projectile has a horizontal and a vertical part.. Found a formular for that on wikipedia aswell: ProjectilVelocity.x = projectilSpeed * cos(theta) ProjectilVelocity.y = projectilSpeed * sin(theta) So i would assume this is true for the projectile curve: ProjectilePos_t.x = ProjectilePos_0.x + ProjectileSpeed * t ProjectilePos_t.y = ProjectilePos_0.y + ProjectileSpeed * t + 0.5f * gravity * t * t ProjectilePos_t.z = ProjectilePos_0.z + ProjectileSpeed * t The target walk with a constant speed, so we can determine his curve by this: TargetPos_t = TargetPos_0 + TargetSpeed * D3DXVECTOR3(t, t, t) Now i dont know how to continue. I have to solve it somehow to get a hold on the time to impact somehow. As a basic formular i could use: float time = distanz / projectileSpeed But that wouldnt be truly correct as it would assume a linear "Trajectory". We just find this behaivor when using a rocket. I hope i was able to explain the problem as much as possible. If there are questions left, feel free to ask me! Greets from germany, Frank

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  • Javascript fine grain performance tweaking

    - by thermal7
    I have been writing my first jQuery plugin and struggling to find a means to time how long different pieces of code take to run. I can use firebug and console.time/profile. However, it seems that because my code executes so fast I get no results with profile and with time it spits out 0ms. (http://stackoverflow.com/questions/2690697/firebug-profiling-issue-no-activity-to-profile/2690846#2690846) Is there a way to get the time at a greater level of detail that milliseconds in javascript?

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  • Static lock in Python?

    - by roddik
    Hello. I've got the following code: import time import threading class BaseWrapper: #static class lock = threading.Lock() @staticmethod def synchronized_def(): BaseWrapper.lock.acquire() time.sleep(5) BaseWrapper.lock.release() def test(): print time.ctime() if __name__ is '__main__': for i in xrange(10): threading.Thread(target = test).start() I want to have a method synchronized using static lock. However the above code prints the same time ten times, so it isn't really locking. How can I fix it? TIA

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  • Help with MySQL query

    - by Michael S.
    I have a table that contains the next columns: ip(varchar 255), index(bigint 20), time(timestamp) each time something is inserted there, the time column gets current timestamp. I want to run a query that returns all the rows that have been added in the last 24 hours. This is what I try to execute: SELECT ip, index FROM users WHERE ip = 'some ip' AND TIMESTAMPDIFF(HOURS,time,NOW()) < 24 And it doesn't work. Can someone help me out? Thanks :)

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  • How do you keep track of your programming TODOs?

    - by Simucal
    I'm one of those people who can't get anything done without a to-do list. If it isn't on the list it doesn't exist. Notepad Method: When I'm programming I've been keeping notepad open with a list of to-do's for my current project. I'll constantly re-arrange these based off priority and I cross them off and move them to the completed section when I'm finished with that particular task. Code Comments: Some programmers pepper their projects source code with: // TODO: Fix this completely atrocious code before anyone sees it Plus, I know that there are some tools that show you a list of all TODOs in your code as well. Website Task Tracker: Remember The Milk Backpack Manymoon Voo2do Gmail Tasks TeuxDeux TodoDodo Ta-da lists ... and many more What have you found to be the best method of keeping track of your to-do lists for multiple projects? Related Question: What can someone do to get organized around here? Related Question: Getting Organized; the to-do list.

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  • Java - How to get current year?

    - by Yatendra Goel
    I want to know the current Date and Time. The code Calendar.getInstance(); represents a date and time of the system on which the program is running and the system date can be wrong. So Is there any way by which I can get correct current date and time irrespective of the date and time of the system on which program is running?

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  • how to clear the 'double right click ' on google-map-v3..

    - by zjm1126
    this is my code, and I can't remove the mousedown eventlistener : //*********** double right click ********/ var c =0 ; function time(event){ if(event.button == 2){ c++; setTimeout(cc, 600); } if (c >1){ alert('ok i get it') } } //$('#map_canvas')[0].mousedown(time); $('#map_canvas')[0].addEventListener('mousedown', time, false); //$("map_canvas").unbind() //$('map_canvas')[0].onmousedown=function(){};//this can't be clear the event $('map_canvas')[0].removeEventListener('mousedown', time, false); function cc(){ c=0; } //*********** double right click ********/

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  • Windows batch file timing bug

    - by elbillaf
    I've used %time% for timing previously - at least I think I have. I have this weird IF NOT "%1" == "" ( echo Testing: %1 echo Start: %time% sqlcmd -S MYSERVER -i test_import_%1.sql -o "test_%1%.log" sleep 3 echo End: %time% ) I run this, and it prints: Testing: pm Start: 13:29:45.30 End: 13:29:45.30 In this case, my sql code is failing (different reason), but I figure the sleep 3 should make the time increment by 3 at least. Any ideas? tx, tff

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  • iPhone: how to keep integer value on UILabel

    - by Nandakishore
    i am working on Twitter on iPhone now i have to keep the count of Friend, Tweets, Followers etc on UILabel how to work with this (void)userInfoReceived:(NSArray *)userInfo forRequest:(NSString *)connectionIdentifier { NSLog(@"User Info Received: %@", userInfo); // userInfo contains all user details like userName, screenName, count of Friends, Followers, Following, Status Count etc NSLog(@"User Info Received: %d", [userInfo count]); NSMutableDictionary *profileData = [userInfo objectAtIndex:0]; //converting userInfo array into profileData dictionary lblUserName.text = [profileData objectForKey:@"name"]; // lblUserName is UILabel, userName keeping on Label lblLocation.text = [profileData objectForKey:@"location"]; // lblLocation is UILabel, Location keeping on Label lblDescription.text = [profileData objectForKey:@"description"]; // lblDescription is UILabel, Location keeping on Label /////* Up to here all working but how to Keep integer value on UILabel *///// lblFolCount = (NSNumber *)[profileData objectForKey:@"followers_count"]; //how to keep user Followers Count on UILable lblFavCount = (NSNumber *)[profileData objectForKey:@"favourites_count"]; //how to keep user Followers Count on UILable lblStatusCount = (NSNumber *) [profileData objectForKey:@"statuses_count"]; //how to keep user statuses count on UILable lblFriends = (NSNumber *) [profileData objectForKey:@"friends_count"]; //how to keep user friends count on UILable } ////**This info Display on debugger console*/////// ////NSLog(@"User Info Received: %@", userInfo); // by this we get info on debugger console User Info Received: ( { "created_at" = "Tue Nov 02 14:42:42 +0000 2010"; description = "being honest"; favorited = false; "favourites_count" = 0; "followers_count" = 5; "friends_count" = 21; "listed_count" = 0; location = Chennai; name = "nanda kishore reddyv"; "profile_background_color" = EDECE9; "profile_background_image_url" = "http://a2.twimg.com/a/1292975674/images/themes/theme3/bg.gif"; "profile_background_tile" = false; "profile_image_url" = "http://a2.twimg.com/a/1292975674/images/default_profile_6_normal.png"; "retweet_count" = 0; "screen_name" = velugotinanda; source = "<a href=\"http://www.icodeblog.com\" rel=\"nofollow\">iCodeBlog Oauth Demo</a>"; status = "Mon Dec 27 09:22:44 +0000 2010"; "statuses_count" = 15; "time_zone" = "Indiana (East)"; verified = false; } ) 2011-01-01 10:38:29.460 IdeaTweet[471:207] User Info Received: 1 Thanks YOU can you tell me how to Keep integer Value on UILabel

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  • Store data in file system rather than SQL or Oracle database.

    - by nunu
    Hi All, As I am working on Employee Management system, I have two table (for example) in database as given below. EmployeeMaster (DB table structure) EmployeeID (PK) | EmployeeName | City MonthMaster (DB table structure) Month | Year | EmployeeID (FK) | PrenentDays | BasicSalary Now my question is, I want to store data in file system rather than storing data in SQL or ORACLE. I want my data in file system storage for Insert, Edit and Delete opration with keeping relation with objects too. I am a C# developer, Could anybody have thoughts or idea on it. (To store data in file system with keeping relations between them) Thanks in advance. Any ideas on it?

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  • Does Meta Refresh work during page load?

    - by waquin
    Page A has a meta refresh to redirect to another page, C, after a certain amount of time (time T). From page A a link is clicked that takes a long time to load, longer than time T, and would eventually load another page; B. Will the meta refresh on page A cause the page to be re-directed to C, or will the processing of the link override the meta refresh, eventually loading page B?

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  • MS Access question

    - by Scott Jackson
    I've an access database table with 3 fields : Purchase date Warranty time Warranty expiry Warranty time has 1, 2, 3, 4, 5 in it which corresponds to years. How can I auto-populate the 'Warranty expiry' field (which is a date field) by looking at the 'Purchase date' and then adding on the 'Warranty time' (warranty time will be 1 = 365 days, 2 = 730 days, etc)?

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  • SQL Compare-Like tool for Oracle?

    - by Hitchhiker
    We're a .NET team which uses the Oracle DB for a lot of reasons that I won't get into. But deployment has been a bitch. We are manually keeping track of all the changes to the schema in each version, by keeping a record of all the scripts that we run during development. Now, if a developer forgets to check-in his script to the source control after he ran it - which is not that rare - at the end of the iteration we get a great big headache. I hear that SQL Compare by Red-Gate might solve these kind of issues, but it only has SQL Server support. Anybody knows of a similar tool for Oracle? I've been unable to find one.

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  • Poor performance / speed of regex with lookahead

    - by Hugo Zaragoza
    I have been observing extremely slow execution times with expressions with several lookaheads. I suppose that this is due to underlying data structures, but it seems pretty extreme and I wonder if I do something wrong or if there are known work-arounds. The problem is determining if a set of words are present in a string, in any order. For example we want to find out if two terms "term1" AND "term2" are somewhere in a string. I do this with the expresion: (?=.*\bterm1\b)(?=.*\bterm2\b) But what I observe is that this is an order of magnitude slower than checking first just \bterm1\b and just then \bterm2\b This seems to indicate that I should use an array of patterns instead of a single pattern with lookaheads... is this right? it seems wrong... Here is an example test code and resulting times: public static void speedLookAhead() { Matcher m, m1, m2; boolean find; int its = 1000000; // create long non-matching string char[] str = new char[2000]; for (int i = 0; i < str.length; i++) { str[i] = 'x'; } String test = str.toString(); // First method: use one expression with lookaheads m = Pattern.compile("(?=.*\\bterm1\\b)(?=.*\\bterm2\\b)").matcher(test); long time = System.currentTimeMillis(); ; for (int i = 0; i < its; i++) { m.reset(test); find = m.find(); } time = System.currentTimeMillis() - time; System.out.println(time); // Second method: use two expressions and AND the results m1 = Pattern.compile("\\bterm1\\b").matcher(test); m2 = Pattern.compile("\\bterm2\\b").matcher(test); time = System.currentTimeMillis(); ; for (int i = 0; i < its; i++) { m1.reset(test); m2.reset(test); find = m1.find() && m2.find(); } time = System.currentTimeMillis() - time; System.out.println(time); } This outputs in my computer: 1754 150

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  • addition of gmt times in php

    - by hunt
    Hi , i have a time zone in 2010-05-04T05:27:00.000Z format which indicates the GMT time and i want to add GMT 10+ in to it using php. i can do that thing using following code but how would i directly add 2010-05-04T05:27:00.000Z and GMT 10+ so that i can get a valid date and time. $offset=10*60*60; $dateFormat="d-m-Y H:i::m:s"; echo $timeNdate=gmdate($dateFormat, time()+$offset);

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  • focus not going to another button in android

    - by Rajendar
    Hi, I wrote a code for pinging of given URL.It works fine for me.But whenever i clicked on the start ping button, pinging started but that time focus always is on start button and no widget of the screen working that time. After pressing many times it will gives the force close error.If iam giving URL which is not pinging then that time , all the widgets are working fine.After some time i need to stop the pinging by using my stop button.But it is not working.Please give me advise.Iam using Runtime.exec() for ping command in my android.Plz give me advise.

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  • I'm getting reports that my app is draining the battery, but only on HTC Incredible.

    - by BenTobin
    Has anyone else noticed behavior specific to the HTC Incredible that might result in an app keeping the device awake and busy? I've received reports that my app is responsible for keeping the device awake and draining the battery, but only from HTC Incredible users. My app responds to a number of Intents that might be related. It has a service that starts on boot, and it also responds to changes in network connectivity. I do use a WakeLock, but I'm careful to release it when I'm done processing, and the WakeLock times out after a couple minutes whether I'm done or not. I've heard that the Incredible may have some connectivity problems, or that some of them do. Could it be that the network is going up and down frequently, triggering my app? Any other ideas? I've asked a user to send me their logs with aLogCat. If they're willing, that may help narrow down the cause.

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