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hard$33779$ - перевод на греческий
COMPLEXITY CLASS
NP hard; Np hard; Np-hard; NP-Hard Problem; NP-HARD; NP-hard problems; NP-Hard; NP-hard
![P≠NP]], while the right side is valid under the assumption that P=NP (except that the empty language and its complement are never NP-complete)](https://commons.wikimedia.org/wiki/Special:FilePath/P np np-complete np-hard.svg?width=200 "P≠NP]], while the right side is valid under the assumption that P=NP (except that the empty language and its complement are never NP-complete)")
hard
adj. στρυφνός, χαλεπός, σκληρός, σταθερός, δριμύς, δύσκολος
fixed disk
![read-write head]], showing the side facing the platter](https://commons.wikimedia.org/wiki/Special:FilePath/HDD read-write head.jpg?width=200 "read-write head]], showing the side facing the platter")
![Hot-swappable]] HDD enclosure](https://commons.wikimedia.org/wiki/Special:FilePath/IBM TotalStorage Exp400.jpg?width=200 "Hot-swappable]] HDD enclosure")
![Longitudinal recording (standard) & [[perpendicular recording]] diagram](https://commons.wikimedia.org/wiki/Special:FilePath/Perpendicular Recording Diagram.svg?width=200 "Longitudinal recording (standard) & [[perpendicular recording]] diagram")
![Seagate]] HDD that used the [[Parallel ATA]] interface](https://commons.wikimedia.org/wiki/Special:FilePath/Seagate ST33232A hard disk inner view.jpg?width=200 "Seagate]] HDD that used the [[Parallel ATA]] interface")
DATA STORAGE DEVICE
Hard drive; Hard disk drive functioning; Hard-disk; Harddisk; Hard disc; Harddisc; Hard Disk; Hard disks; Hard drives; Hard disc drive; Harddrive; Hard disk drives; Fixed disk; Pocket hard drive; Hard Drives; External hard drive; Hard file; External hard disk; Disk Overhead; External Hard Drive; External HDD; Laptop hard drive; Access arm; Actuator arm; External Hard Drives; Hard disk interfaces; Hard Disks; Hard Disk Drive; PC hard disks; Hard disk; Travel drive; The binary effect; USB hard disk; 2.5 inch hard drive; Usb hard disk; Enterprise disk drive; Hard disk parameters; Hard drive capacity; Fixed disk drive; External hard disk drive; Fixed drive; HDD Thermometer; ExternalHDD; Femto Slider; Spindle (computer); External volumes; Portable hard drives; Portable hard disk; Portable hard disk drive; External hard drives; Disk structure; Internal hard drive; Hard-disk drive; Hard disk drive spindle; Disk drive spindle; Portable hard drive; Hard disk drive actuator; Spindle (hard disk drive); Hard disk error rates and handling; Disk subsystem; Portable drive; External removable drive; External removable hard disk drive; External portable hard disk drive; External portable drive; USB hard disk drive; Portable USB hard disk; Portable USB hard disk drive; HDD form factor; Rigid disk drive; Hard-Drive; PowerChoice; Hard disk driver; Magnetic disk memory; Hard disk drive error rates and handling; 🖴; Magnetic hard drive; Rotating iron; Rotating rust; Hard disk drive form factor; Hard disk storage; Rotational media
σταθερός δίσκος
access arm
DATA STORAGE DEVICE
Hard drive; Hard disk drive functioning; Hard-disk; Harddisk; Hard disc; Harddisc; Hard Disk; Hard disks; Hard drives; Hard disc drive; Harddrive; Hard disk drives; Fixed disk; Pocket hard drive; Hard Drives; External hard drive; Hard file; External hard disk; Disk Overhead; External Hard Drive; External HDD; Laptop hard drive; Access arm; Actuator arm; External Hard Drives; Hard disk interfaces; Hard Disks; Hard Disk Drive; PC hard disks; Hard disk; Travel drive; The binary effect; USB hard disk; 2.5 inch hard drive; Usb hard disk; Enterprise disk drive; Hard disk parameters; Hard drive capacity; Fixed disk drive; External hard disk drive; Fixed drive; HDD Thermometer; ExternalHDD; Femto Slider; Spindle (computer); External volumes; Portable hard drives; Portable hard disk; Portable hard disk drive; External hard drives; Disk structure; Internal hard drive; Hard-disk drive; Hard disk drive spindle; Disk drive spindle; Portable hard drive; Hard disk drive actuator; Spindle (hard disk drive); Hard disk error rates and handling; Disk subsystem; Portable drive; External removable drive; External removable hard disk drive; External portable hard disk drive; External portable drive; USB hard disk drive; Portable USB hard disk; Portable USB hard disk drive; HDD form factor; Rigid disk drive; Hard-Drive; PowerChoice; Hard disk driver; Magnetic disk memory; Hard disk drive error rates and handling; 🖴; Magnetic hard drive; Rotating iron; Rotating rust; Hard disk drive form factor; Hard disk storage; Rotational media
βραχιόνας προσπέλασης
Определение
hard-coded
<jargon> (By analogy with "hard-wired") Said of a data value
or behaviour written directly into a program, possibly in
multiple places, where it cannot be easily modified. There
are several alternatives, depending on how often the value is
likely to change. It may be replaced with a compile-time
constant, such as a C "#define" macro, in which case a
change will still require recompilation; or it may be read at
run time from a profile, resource (see de-rezz), or
environment variable that a user can easily modify; or it
may be read as part of the program's input data.
To change something hard-coded requires recompilation (if
using a compiled language of course) but, more seriously, it
requires sufficient understanding of the implementation to be
sure that the change will not introduce inconsistency and
cause the program to fail.
For example, "The line terminator is hard-coded as newline;
who in their right mind would use anything else?"
See magic number.
[Jargon File ]
(1999-10-18)
Википедия
NP-hardness
In computational complexity theory, NP-hardness (non-deterministic polynomial-time hardness) is the defining property of a class of problems that are informally "at least as hard as the hardest problems in NP". A simple example of an NP-hard problem is the subset sum problem.
A more precise specification is: a problem H is NP-hard when every problem L in NP can be reduced in polynomial time to H; that is, assuming a solution for H takes 1 unit time, H's solution can be used to solve L in polynomial time. As a consequence, finding a polynomial time algorithm to solve any NP-hard problem would give polynomial time algorithms for all the problems in NP. As it is suspected that P≠NP, it is unlikely that such an algorithm exists.
It is suspected that there are no polynomial-time algorithms for NP-hard problems, but that has not been proven. Moreover, the class P, in which all problems can be solved in polynomial time, is contained in the NP class.
