Example C++ Library

[zari_sof]

how to use map (in c++ library )for compare two array m*n ?

[leppyr64]

cplusplus.com/reference/stl/map/

Please give an example of what you are trying to do.

[zari_sof]

Hi
example:i have array of character (c c h h o), i want to put charachter this array of charachters in other array:
1 2 1
1 3 1
14 2
then compare two array m*n

[leppyr64]

Array of characters:

char C[5] = {'c', 'c', 'h', 'h', 'o'}

How does this relate to the character array posted above? I have no idea what these numbers you have posted mean.

1 2 1
1 3 1
1 4 2

[zari_sof]

i.e numbers in array of integer are index array of charachters
1=c
2=c
3=h
4=h
third index in array of integer mean is first number correspond second number?
is solving by hash?

[leppyr64]

#include <string>
#include <map>
#include <iostream>
using namespace std;
int main()
{
	string s = "cchh";
	map<char,int> first_index;
	for(int i = 0; i < s.size(); i++)
	{
		if(first_index[s[i]] == 0)
			first_index[s[i]] = i+1;
		cout << i+1 << " " << first_index[s[i]] << " " << (i+1==first_index[s[i]]) << endl;
	}
}

Output:

Index of character, first index of character, first index = index of character
1 1 1
2 1 0
3 3 1
4 3 0

I'm not certain if this is right, because your description of the numbers in the list was still not clear.

[zari_sof]

thanks a lot
first number is the label of one charachter and second number
is the label of another charachters and third number is the
type of bond (1=single bond , 2=double bond)
if have 2 string (cchho,chohc)and 2 array of integer ,
how to compare 2 array of integer ?
example:
c c h h o
1 2 1
2 3 2
3 4 1

c c 1
c h 2
h h 1

c h o h c
1 5 1
5 2 2
4 2 1

c c 1
c h 2
h h 1

[leppyr64]

I have no idea what parts that you have posted are input and what parts are output. It looks like you're talking about Chemistry possibly and common bonds. If it's easier for you to explain what you're looking for in terms of chemistry then go for it. I took University level chemistry.

Typically when working with problems around here we work with sample input and expected output. Each has to be defined clearly or else it's impossible to clearly define a solution.

Use this format:
Input:
[give an example of your input here]
[explain what the variables are]

Output:
[give the expected output from the sample input listed above here]

[zari_sof]

if we want to compare two array of charachters (that are equal or not equal) by hashing what i do ?
this way is possible ?

[leppyr64]

Oh ok! Yes that is certainly possible. Simply put, to compare two hashed objects, you just have to compare the hash values (typically integers) that are already created.

Now the question is, how do I create a hashvalue for a string? There are plenty of resources on that
lmgtfy.com/?q=hash+string

The specific solution for what you want can be very simple or very complex. It all depends on how accurate your hash needs to be, and how large a set of data that the hash needs to correspond to. (the domain of the function)

[zari_sof]

thanks for guidance