Rectangle Area

public class Solution {
    public int computeArea(int A, int B, int C, int D, int E, int F, int G, int H) {
        int l, m, n, o;

        // calculate l (left edge)
        if (E > A) l = E;
        else l = A;

        // calculate n (right edge)
        if (G > C) n = C;
        else n = G;

        // calculate m (bottom edge)
        if (B > F) m = B;
        else m = F;

        // calculate o (top edge)
        if (D > H) o = H;
        else o = D;

        int area = ((C-A)*(D-B))+((G-E)*(H-F));

        if (A >= G || C <= E || B >= H || D <= F)
            return area;

        return  area - ((n - l) * (o - m));
    }
}