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#include <iostream>
#include <vector>
#include <map>
#include <utility>
#include <string>
#include <cmath>
 
using namespace std;
map<char,int> m;
map<int,char> mr;
void preprocess()
{
	for(int i=0;i<26;i++){
	m['A'+i]=i+1;
	mr[i+1]='A'+i;
	}
	m['\0']=26;
	mr[26]='\0';
}
 
/*
void dispMatrix(pair<int**,<pair<int,int> > > x)
{
	int m=x.second.first,n=x.second.first;
	int** mat = x.first;
	for(int i=0;i<m;i++)
	{
		cout<<"|";
		for(int j=0;j<nj++)
		{
			cout<<mat[i][j]<<" ";
		}
		cout<<"|"<<endl;
	}
}*/
pair<int**,<pair<int,int> > > matrixMultiply(int** x,int m,int n,int** y)
{
	//Here m is the columns of x and size of y(for simplicity taken as a square matrix) || n is rows of y
	int mul[m][n],c=0;
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<m;j++)
		{
			mul[i][j] = 0;
			for(int k=0;k<m;k++)
			{
				mul[i][j]+=x[i][k]*y[k][i];
			}
			mul[i][j] = mul[i][j]%26;
		}
	}
	return make_pair(mul,make_pair(m,n));
}
pair<int**,<pair<int,int> > > string2Matrix(string s)
{
	int l=s.length();
	int n=(int)ceil(l/5.0);
	int mat[5][n],c=0;
 
	for(int i=0;i<5;i++)
	{
		for(int j=0;j<n;j++)
		{
			if(c<l)
			mat[i][j] = m[s[c]];
			else
			mat[i][j] = '\0';
			c++;
		}
	}
	return make_pair(mat,make_pair(5,n));
}
pair<int**,<pair<int,int> > > key2Matrix(string key)
{
	int mat[5][5],c=0;
 
	for(int i=0;i<5;i++)
	{
		for(int j=0;j<5;j++)
		{
			if(c<l)
			mat[i][j] = m[s[c]];
			else
			mat[i][j] = "\0";
			c++;
		}
	}
	return make_pair(mat,make_pair(5,n));
}
 
string matrix2String(pair<int**,<pair<int,int> > > x)
{
	int m=x.second.first,n=x.second.second;
	string out="";
	for(int i=0;i<m;i++)
	{
		for(int j=0;j<n;j++)
		{
			out = out + mr[m[i][j]];
		}
	}
	return out;
}
 
string hillCipher(string s,string key)
{
	pair<int**,<pair<int,int> > > inp,kk,out;
	inp = string2Matrix(s);
	kk = key2Matrix(s);
	out = matrixMultiply(inp.first,inp.second.first,inp.second.second,kk.first);
	return matrix2String(out);
}
int main()
{
	preprocess();
	string key = "AQUICKBROWNFOXJUMPEDOVERTHELAZYDOG";
	string str = "DOGABROWNTHEQUICKJUMPEDFOXLAZYOVER";
	cout<<hillCipher(str,key);
}
 

prog.cpp:36:29: error: template argument 2 is invalid
 pair<int**,<pair<int,int> > > matrixMultiply(int** x,int m,int n,int** y)
                             ^
prog.cpp: In function 'int matrixMultiply(int**, int, int, int**)':
prog.cpp:52:37: error: no matching function for call to 'make_pair(int [m][n], std::pair<int, int>)'
  return make_pair(mul,make_pair(m,n));
                                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_pair.h:286:5: note: candidate: template<class _T1, class _T2> std::pair<_T1, _T2> std::make_pair(_T1, _T2)
     make_pair(_T1 __x, _T2 __y)
     ^
/usr/include/c++/5/bits/stl_pair.h:286:5: note:   template argument deduction/substitution failed:
prog.cpp:52:37: note:   variable-sized array type 'int (*)[n]' is not a valid template argument
  return make_pair(mul,make_pair(m,n));
                                     ^
prog.cpp: At global scope:
prog.cpp:54:29: error: template argument 2 is invalid
 pair<int**,<pair<int,int> > > string2Matrix(string s)
                             ^
prog.cpp: In function 'int string2Matrix(std::string)':
prog.cpp:71:37: error: no matching function for call to 'make_pair(int [5][n], std::pair<int, int>)'
  return make_pair(mat,make_pair(5,n));
                                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_pair.h:286:5: note: candidate: template<class _T1, class _T2> std::pair<_T1, _T2> std::make_pair(_T1, _T2)
     make_pair(_T1 __x, _T2 __y)
     ^
/usr/include/c++/5/bits/stl_pair.h:286:5: note:   template argument deduction/substitution failed:
prog.cpp:71:37: note:   variable-sized array type 'int (*)[n]' is not a valid template argument
  return make_pair(mat,make_pair(5,n));
                                     ^
prog.cpp: At global scope:
prog.cpp:73:29: error: template argument 2 is invalid
 pair<int**,<pair<int,int> > > key2Matrix(string key)
                             ^
prog.cpp: In function 'int key2Matrix(std::string)':
prog.cpp:81:9: error: 'l' was not declared in this scope
    if(c<l)
         ^
prog.cpp:82:18: error: 's' was not declared in this scope
    mat[i][j] = m[s[c]];
                  ^
prog.cpp:84:14: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
    mat[i][j] = "\0";
              ^
prog.cpp:88:35: error: 'n' was not declared in this scope
  return make_pair(mat,make_pair(5,n));
                                   ^
prog.cpp: At global scope:
prog.cpp:91:50: error: template argument 2 is invalid
 string matrix2String(pair<int**,<pair<int,int> > > x)
                                                  ^
prog.cpp:91:50: error: template argument 2 is invalid
prog.cpp:91:50: error: template argument 2 is invalid
prog.cpp:92:1: error: expected ',' or ';' before '{' token
 {
 ^

Standard output is empty