Answer:
A security utility program that scans the system for small programs that interfere with how a computer functions are _____ utilities.
Explanation:
This is false. A Class B fire consists of highly combustible/flammable liquids and gases such as petroleum oil and propane.
The correct scripts are:
chmod 765 script1
chmod u+x script1
A cοmmand is an instructiοn givеn by a usеr tеlling a cοmputеr tο dο sοmеthing, such a run a singlе prοgram οr a grοup οf linkеd prοgrams. Cοmmands arе gеnеrally issuеd by typing thеm in at thе cοmmand linе (i.е., thе all-tеxt display mοdе) and thеn prеssing thе ЕNTЕR kеy, which passеs thеm tο thе shеll.
In Unix-likе οpеrating systеms, chmοd is thе cοmmand and systеm call which may changе thе accеss pеrmissiοns tο filе systеm οbjеcts. It may alsο altеr spеcial mοdе flags. Thе rеquеst is filtеrеd by thе umask. Thе namе is an abbrеviatiοn οf changе mοdе.
Answer:
Greedy is an algorithmic paradigm that builds up a solution piece by piece, always choosing the next piece that offers the most obvious and immediate benefit. Greedy algorithms are used for optimization problems. An optimization problem can be solved using Greedy if the problem has the following property: At every step, we can make a choice that looks best at the moment, and we get the optimal solution of the complete problem.
If a Greedy Algorithm can solve a problem, then it generally becomes the best method to solve that problem as the Greedy algorithms are in general more efficient than other techniques like Dynamic Programming. But Greedy algorithms cannot always be applied. For example, the Fractional Knapsack problem (See this) can be solved using Greedy, but 0-1 Knapsack cannot be solved using Greedy.
The following are some standard algorithms that are Greedy algorithms.
1) Kruskal’s Minimum Spanning Tree (MST): In Kruskal’s algorithm, we create an MST by picking edges one by one. The Greedy Choice is to pick the smallest weight edge that doesn’t cause a cycle in the MST constructed so far.
2) Prim’s Minimum Spanning Tree: In Prim’s algorithm also, we create an MST by picking edges one by one. We maintain two sets: a set of the vertices already included in MST and the set of the vertices not yet included. The Greedy Choice is to pick the smallest weight edge that connects the two sets.
3) Dijkstra’s Shortest Path: Dijkstra’s algorithm is very similar to Prim’s algorithm. The shortest-path tree is built up, edge by edge. We maintain two sets: a set of the vertices already included in the tree and the set of the vertices not yet included. The Greedy Choice is to pick the edge that connects the two sets and is on the smallest weight path from source to the set that contains not yet included vertices.
4) Huffman Coding: Huffman Coding is a loss-less compression technique. It assigns variable-length bit codes to different characters. The Greedy Choice is to assign the least bit length code to the most frequent character. The greedy algorithms are sometimes also used to get an approximation for Hard optimization problems. For example, the Traveling Salesman Problem is an NP-Hard problem. A Greedy choice for this problem is to pick the nearest unvisited city from the current city at every step. These solutions don’t always produce the best optimal solution but can be used to get an approximately optimal solution.
The steps for moving data from one cell to another are :
Select the cell by pointing on the cell clicking it, and dragging it to the new cell. <span>To move a cell or range of cells, point to the border of the selection. When the pointer becomes a move pointer , drag the cell or range of cells to another location.</span>
