4 lab c++

using namespace std;

// <function of task condition>
void TotalMin();  // uvelichvaet obiem coda, luchshe bez  "function of task condition"
TotalMin( int leftTop, int middle, int rightBottom, int n) {
    if (  (leftTop>middle) && (rightBottom>middle)  )   {
        n++;
        return n;
    }
}
int MinSearch();
MinSearch(int leftTop, int middle, int rightBottom, int i, int j) {
    if (  (leftTop>middle) && (rightBottom>middle)  )   {
        cout<<"IndexMin(i,j) - "<<j<<" "<<i<<endl;
        cout<<" ZnachenieMin - "<<middle<<endl;
    }
}

//  </function of task condition>

int main() {
    int nrow=4, ncol=4;
    int* n = new int;
    //< sozdast massiv i pamyt>
    int **a = new int*[nrow];
    for (int i = 0; i < nrow; i++) {
        a[i] = new int[ncol];
    }
    //< /sozdast massiv i pamyt>

    int i,j;
    int leftTop, middle, rightBottom;
    int key;
tryAgain:
    cout<<"1 - zadat massiv"<<endl;
    cout<<"2 - podschet min cisel"<<endl;
    cout<<"3 - Podschit mines(chisla menshe 0)"<<endl;
    cout<<"4 - Chistka pamayti"<<endl;
    cout<<"5 - Vyvod  min chisel"<<endl;
    cout<<"6 - Exit"<<endl;
    cin>>key;

    //////////////////////////
    if (key==1) {
        cout<<"Set elements:"<<endl;
        for(i=0; i<nrow; i++)
            for(j=0; j<ncol; j++) cin>>a[i][j];
    }
    /////////////////////////

    int mines = 0;
    *n=0;// kollich min chisel

    for(i=0; i<nrow; i++) {
        for(j=0; j<ncol; j++) {

            if (a[i][j]<0) {
                mines++;
            }

            if ( ((i-1)<0) || ((j-1)<0) || ((i+1)==nrow) || ((j+1)==ncol)) { // uslovie pogranichnyh neopredelynostey
                continue;
            } else {
                leftTop = a[i-1][j-1];
                middle = a[i][j];
                rightBottom = a[i+1][j+1];
                if (key==5) {
                    MinSearch(leftTop, middle, rightBottom, i, j); // poisk znachen po usloviu
                }
                *n = TotalMin(leftTop, middle, rightBottom, *n);    // poisk summy znacheniy

            }
//           delete arr[i];
        }
    }
    if (key==2) {
        cout<<"Total min(chisla usliviya 'i-1>i<i+1') "<<*n<<endl;
    }

    if (key==3) {
        cout<<"Total mines(chisla otritsatelnye)  "<<mines<<endl;
    }
    if (key==4) {
        delete n;
        //<udalit pamayt>
        for (int i = 0; i < nrow; i++) {
            delete [] a[i];
        }
        delete [] a;
        //</udalit pamayt>
    }
    if (key==6) {
        //<udalit pamayt>
        for (int i = 0; i < nrow; i++) {
            delete [] a[i];
        }
        delete [] a;
        //</udalit pamayt>
        return 0;
    }
    goto tryAgain;

}