Maximum Non Negative Product in a Matrix.java

// Runtime: 4 ms (Top 41.67%) | Memory: 43.3 MB (Top 29.76%)
class Solution {
    public class Pair{
        long min=Integer.MAX_VALUE,max=Integer.MIN_VALUE;
        Pair(){

        }
        Pair(long min,long max){
            this.min=min;
            this.max=max;
        }
    }
    public int maxProductPath(int[][] grid) {
        Pair[][] dp=new Pair[grid.length][grid[0].length];
        for(int r=grid.length-1;r>=0;r--){
            for(int c=grid[0].length-1;c>=0;c--){
                if(r==grid.length-1 && c==grid[0].length-1){
                    dp[r][c]=new Pair(grid[r][c],grid[r][c]);
                }else{
                    Pair hor=(c==grid[0].length-1)?new Pair():dp[r][c+1];
                    Pair ver=(r==grid.length-1)?new Pair():dp[r+1][c];
                    long min,max;
                    if(grid[r][c]>=0){
                         max=Math.max(hor.max,ver.max);
                         min=Math.min(hor.min,ver.min);
                    }else{
                         min=Math.max(hor.max,ver.max);
                         max=Math.min(hor.min,ver.min);
                    }
                        dp[r][c]=new Pair(min*grid[r][c],max*grid[r][c]);
                }
            }
        }
        int mod=(int)1e9 +7;
        return dp[0][0].max<0?-1:(int)(dp[0][0].max%mod);
    }
}