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day-11-2.js
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day-11-2.js
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var input = "cqjxxyzz"; // zaa?
// var input = "abcdefgh"; // abcdffaa
// var input = "ghijklmn"; // ghjaabcc
var straight = false;
var omission = false;
var pairs = false;
var increment = false;
String.prototype.replaceAt = function (index, character) {
var subject = this.split ("");
subject [index] = character;
return subject.join ("");
}
do {
omission = false;
straight = false;
pairs = false;
increment = false;
// Increment from the right
for (var x = input.length - 1; x >= 0; x --) {
if (input [x] == "z") {
// Increment
input = input.replaceAt (x, "a");
increment = true;
} else if (x == input.length - 1 || increment) {
var code = input.charCodeAt (x);
var letter = String.fromCharCode (code + 1);
letter = letter == "i" ? "j" : letter;
letter = letter == "l" ? "m" : letter;
letter = letter == "o" ? "p" : letter;
input = input.replaceAt (x, letter);
break;
}
}
// Check for omissions
if (input.indexOf ("i") == -1 && input.indexOf ("l") == -1 && input.indexOf ("o") == -1) {
omission = true;
} else {
continue;
}
// Check for pairs
var pair = input.search (/([a-z])\1/);
if (pair != -1) {
var repeat = input.substring (pair + 2);
pair = repeat.search (/([a-z])\1/);
if (pair != -1) {
pairs = true;
// console.log ("pairs");
} else continue;
} else continue;
// Check for straights
for (var x = 0; x < input.length - 2; x ++) {
var code = input.charCodeAt (x);
if (input.charCodeAt (x + 1) == code + 1 && input.charCodeAt (x + 2) == code + 2) {
straight = true;
// console.log ("straight");
break;
}
}
} while (!straight || !omission || !pairs);
console.log (input);
alert (input); // cqkaabcc