Title, Fortran - rextester

Title

#include <iostream>
#include <vector>
using namespace std;
void print(vector<vector<char>> board){
    for(int i = 0; i < board.size(); i++){
        for(int j = 0; j < board[i].size(); j++){
            cout << board[i][j] << " ";
        }
        cout << endl;
    }
    cout << endl;
}
bool checkIfFilled(vector<vector<char>> board){
    for(int i = 0; i < 4; i++){
        for(int j = 0; j < 4; j++){
            if(board[i][j] == '.')
                return false;
        }
    }
    return true;
}
bool checkIfInsertOkay(vector<vector<char>> board, int x, int y, char num){
    for(int j = 0; j < 4; j++){
        if(board[x][j] == num)
            return false;
    }
    for(int i = 0; i < 4; i++){
        if(board[i][y] == num)
            return false;
    }
    if(x < 2)
        x = 0;
    else if(x < 4)
        x = 2;
    else
        x = 4;
    if(y < 2)
        y = 0;
    else if(y < 4)
        y = 2;
    else
        y = 4;
    for(int i = x; i < x+2; i++){
        for(int j = y; j < y+2; j++){
            if(board[i][j] == num)
                return false;
        }
    }
    return true;
}
bool sudokuSolveHelper(vector<vector<char>> &board){
    if(checkIfFilled(board))
        return true;
    for(int i = 0; i < 4; i++){
        for(int j = 0; j < 4; j++){
            if(board[i][j] == '.'){
                for(int k = 1; k <= 4; k++){
                    char ch = '0' + k;
                    if(checkIfInsertOkay(board, i, j, ch)){
                        board[i][j] = ch;
                        bool flag = sudokuSolveHelper(board);
                        if(flag)
                            return true;
                        else
                            board[i][j] = '.';
                    }
                }
                return false;
            }
        }
    }
    return true;
}
bool sudokuSolve(vector<vector<char>> &board){
    return sudokuSolveHelper(board);
}
int main() {
    vector<vector<char>> board = {
            {'.','.','.','4'},
            {'4','.','.','1'},
            {'.','3','.','2'},
            {'.','4','.','3'},
    };
    print(board);
    bool flag = sudokuSolve(board);
    if(flag){
        cout << "JAVAB MOJUD AST\n";
        print(board);
    }
    else
        cout << "BEDUNE JAVAB\n";
    return 0;
}


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