Thread: Cannot find Bug in my Othello program.

I have written an Othello game program that you play in the console but it will not let you make a move in the bottom row of the board. The program crashes. I've looked and looked for hours and can't find the problem. Any help would be appreciated. I have a comment in the code where I think the problem is happening.

Code:

#include <vector>
#include <iostream>
#include <algorithm>
#include <utility>
#include <stack>
using namespace std;




#define SIZE 4

vector<pair<int,int> > get_all_flips(vector<vector<int> >& board, int r, int c, int color){
    vector<pair<int,int> > rv;
    int rr,cc;
    int opposite = color^3;

    //N,NE,E,SE,S,SW,W,NW
    int drs[]={-1,-1, 0, 1, 1, 1, 0,-1};
    int dcs[]={ 0, 1, 1, 1, 0,-1,-1,-1};
    for(int qq=0;qq<8;++qq){
        int dr = drs[qq];
        int dc = dcs[qq];
        rr=r+dr;
        cc=c+dc;

        if(board[rr][cc] == opposite ){
            stack<pair<int,int> >stk;

            while( rr >= 0 && cc >= 0 && rr < SIZE && cc < SIZE &&
                                        board[rr][cc] == opposite ){
                stk.push(make_pair(rr,cc));
                rr+=dr;
                cc+=dc;
            }

            //fallen off board, hit blank, hit my own color
            if( rr >= 0 && cc >= 0 && rr < SIZE && cc < SIZE &&
                                        board[rr][cc] == color ){
                while(!stk.empty()){
                    rv.push_back( stk.top() );
                    stk.pop();
                }
            }
        }
    }
    return rv;
}
bool is_valid_move(vector<vector<int> >& board, int r, int c, int colour){
    if( get_all_flips(board,r,c,colour).empty())
        return true;
    else
        return false;
}
void print_board(vector<vector<int> >& board){
    cout << "  ";
    for(int i=0;i<SIZE;i++)
        cout  << " " << i ;
    cout << "\n";

    for(int i =0; i<SIZE; ++i){
        cout << i << " ";
        for(int j=0;j<SIZE;j++){
            if( board[i][j] == 0 )
                cout << "| ";
            else if(board[i][j] == 1 )
                cout << "|O" ;
            else
                cout << "|#";
        }
        cout << "|\n";
    }
}
bool can_someone_move(vector<vector<int> >&board){
    for(int i=0;i<SIZE;++i){
        for(int j=0;j<SIZE;++j){
            if( board[i][j] == 0 )
                return true;
        }
    }
    return false;
}


int blkCount(vector<vector<int> >&board){
    int blackcount = 0;
    for(int i = 0; i<SIZE; ++i)
        for(int j = 0; j<SIZE; ++j){
            if(board[i][j] == 2)
                blackcount++;
        }


    return blackcount;
    }

int whtCount(vector<vector<int> >&board){
    int whitecount = 0;
    for(int i = 0; i<SIZE; ++i)
        for(int j = 0; j<SIZE; ++j){
            if(board[i][j] == 1)
                whitecount++;
        }


    return whitecount;
    }




int main(int argc, char* argv[])
{

    do{
    vector<vector<int> > board;
    vector<pair<int,int> > rv;
    int temp;


    board.resize(SIZE);
    for(int i=0;i<SIZE;++i)
        board[i].resize(SIZE);
    board[SIZE/2][SIZE/2] = board[SIZE/2-1][SIZE/2-1] = 1;
    board[SIZE/2-1][SIZE/2] = board[SIZE/2][SIZE/2-1] = 2;

    int turn=1;
    while( can_someone_move(board) ){
        print_board(board);
        //Shows score of the game.
        //int blkCount = 2;
        //int whtCount = 2;
        int blackcount = blkCount(board);
        int whitecount = whtCount(board);
        cout << "Black Count is: " << blackcount << endl;
        cout << "White Count is: " << whitecount << endl;

        if(turn == 1){
            cout << "Player 1 Move (row column)? ";
            //cout << "" << endl;
        }
        else{
            cout << "Player 2 Move (row column)? ";
            //cout << "" << endl;
        }
        int r,c;
        cin >> r >> c;
        if( cin.fail() ){
            cout << "BAD!\n";
            continue;
        }


        //off the board or space is used
        if( r < 0 || c < 0 || r >= SIZE || c >= SIZE ||                 //!!!!!!!!!!!!
            board[r][c] != 0 || !is_valid_move(board,r,c,turn) ){         //This code is causing problem
            cout << "You're stupid! Try Again!\n";
            continue;
        }


        //determine which pieces to flip
        temp = board[r][c];
        board[r][c] = turn ^ 3;
        rv = get_all_flips(board, r, c, turn ^ 3);




        //flip them
        if(!rv.empty()){                                        //if rv returns empty there is nothing to flip so move is invalid.
            for(int i = 0; i<rv.size(); i++ ){
                board[rv[i].first][rv[i].second] = turn^3;
            }
        }
        else{
            cout << "Invalid Move, Choose Again." << endl;
            board[r][c] = temp;
            continue;
        }


        turn = turn ^ 3;
        cout << "" << endl;


    }

    }while(1);

};