Move the area

[bstroe]

I want to move the areas : N -> E, E -> S, S -> V, V -> N
The problem is that my code moves only one element in the matrix and not all the elements in the area.
EX:
4
11 12 13 14
21 22 23 24
31 32 33 34
41 42 43 44
The correct output:
11 31 21 14
42 22 23 12
43 32 33 13
41 34 24 44
My ouput:
11 12 31 14
21 22 23 24
43 32 33 13
41 42 34 44

  #include <iostream>
#include <fstream>
using namespace std;

int main() {
    ifstream fin("date.in");
    int N, mt[51][51], areaN[51][51], areaE[51][51], areaS[51][51], areaV[51][51];
    fin >> N;
    for (int i = 1; i <= N; i++) {
        for (int j = 1; j <= N; j++) {
        fin >> mt[i][j];
    }
    }
    int lineN, colN, lineS, colS, lineE, colE, lineV, colV;
    for (int i = 1; i <= N; i++) {
        for (int j = 1; j <= N; j++) {
            if (i < j && i + j < N + 1) {

                lineN = i;
                colN = j;
                areaN[i][j] = mt[i][j];
            }
            if (i > j && i + j < N + 1) {
                areaV[i][j]  = mt[i][j];
                lineV = i;
                colV = j;
            }
             if (i > j && i + j > N + 1) {
                areaS[i][j]  = mt[i][j];
                lineS = i;
                colS = j;
            }

            if (i < j && i + j > N + 1) {
                areaE[i][j]  = mt[i][j];
                lineE = i;
                colE = j;
            }
        }
    }
    mt[lineE][colE] = areaN[lineN][colN];
    mt[lineS][colS] = areaE[lineE][colE];;
    mt[lineV][colV] = areaS[lineS][colS];
    mt[lineN][colN] = areaV[lineV][colV];

    for (int i = 1; i <= N; i++) {
        for (int j = 1; j <= N; j++) {
            cout <<mt[i][j] << " ";
        }
        cout << "\n";
    }
}

[lastchance]

#include <iostream>
#include <iomanip>
#include <sstream>
#include <fstream>
using namespace std;


istringstream fin(           // data file
"4           \n"
"11 12 13 14 \n"
"21 22 23 24 \n"
"31 32 33 34 \n"
"41 42 43 44 \n"
);


int main()
{
   const int MX = 1 + 50;
// ifstream fin( "date.in" );
   int N, mt[MX][MX];

   // Read
   fin >> N;
   for ( int i = 1; i <= N; i++ )
   {
      for ( int j = 1; j <= N; j++ ) fin >> mt[i][j];
   }

   // Rotate
   for ( int p = 2; p <= N - 1; p++ )
   {
      int temp = mt[N-p+1][1];
      mt[N-p+1][1    ] = mt[N][N-p+1];
      mt[N    ][N-p+1] = mt[p][N    ];
      mt[p    ][N    ] = mt[1][p    ];
      mt[1    ][p    ] = temp;
   }

   // Write
   for ( int i = 1; i <= N; i++ )
   {
      for ( int j = 1; j <= N; j++ ) cout << setw( 2 ) << mt[i][j] << ' ';
      cout << '\n';
   }
}

11 31 21 14 
42 22 23 12 
43 32 33 13 
41 34 24 44