/**
 * @param {string} S
 * @param {string} T
 * @return {boolean}
 */
var b = "#"

var normalize = s => {
    var c
    while ((c=s.search(b))>-1)s=(s[c-2]?s.slice(0, c-1):'')+s.slice(c+1)
    return s
}
var backspaceCompare = function(S, T) {

    const [S_,T_] = [S,T].map(normalize);
    return S_ == T_
};