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    public static String kangaroo(int x1, int v1, int x2, int v2) {
    // Write your code here
    int kangaroo1=x1, kangaroo2=x2;
    if (kangaroo1>kangaroo2) {
       while(kangaroo1>=kangaroo2){
        kangaroo1=kangaroo1+v1;
        kangaroo2=kangaroo2+v2;
        if(kangaroo1==kangaroo2){
            return("YES");
        }
       }
    
    } else if(kangaroo1<kangaroo2) {
         while(kangaroo1<=kangaroo2){
        kangaroo1=kangaroo1+v1;
        kangaroo2=kangaroo2+v2;
        if(kangaroo1==kangaroo2){
            return("YES");
        }  
    }
    
    } else{
        do {
        kangaroo1=kangaroo1+v1;
        kangaroo2=kangaroo2+v2;
        if(kangaroo1==kangaroo2){
            return("YES");
        } 
        } while (kangaroo1 != kangaroo2);
    
    }
    return("NO");
    

    }****