rattle joint

for(int i=0;i<astronaut.Length;i++){
            int lesser,greater;

            if(astronaut[i][0]<astronaut[i][1]){
                lesser = astronaut[i][0];
                greater = astronaut[i][1];
            }else{
                lesser = astronaut[i][1];
                greater = astronaut[i][0];
            }

            if(!allCountries.ContainsKey(lesser)) lesser = roots[lesser];
            if(!allCountries.ContainsKey(greater)) greater = roots[greater];

            allCountries[roots[lesser]].UnionWith(allCountries[roots[greater]]);
            foreach(int key in allCountries[greater]){
                roots[key] = roots[lesser];
            }
            if(roots[greater]!=greater) allCountries.Remove(greater);
            //PrintRoots(roots,n);
            //PrintCountries(allCountries);
        }