vertex_sort.js

function getHash (v) {
    
    return v.x+'_'+v.y+'_'+v.z;
    
}

function solve(input) {
    
    var l = input.length,
        map = {},
        hash;
    
    while(l--) {
        
        hash = getHash(input[l]);
        
        if(map[hash]) {
            
            return true;
            
        }
        
        map[hash] = true;
        
    }
    
    return false;
    
}