03 February Last cell in a Matrix

class Solution{
    public:
    pair<int,int> endPoints(vector<vector<int>> matrix, int R, int C){
        //code here
        int x=0;
        int y=0;
        int dir =0;
        int dirx[] = {0,1,0,-1};
        int diry[] = {1,0,-1,0};
        while(x>=0 && y>=0 && x<R && y< C){
            if(matrix[x][y]){
                dir = (dir+1)%4;
                matrix[x][y] =0;
                
            }
            x+=dirx[dir];
            y += diry[dir];
        }
        pair<int,int> ans;
        ans.first = x-dirx[dir];
        ans.second = y-diry[dir];
        return ans;
    }
};