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day-7-2.js
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day-7-2.js
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var input = document.getElementsByTagName ("pre") [0].textContent.split ("\n");
wires = {
"b": 956
};
var skip = [];
// Find literal values first
for (var i = 0; i < input.length; i ++) {
var parameters = input [i].split (" ");
if (parameters.length != 3 || isNaN (parameters [0])) continue;
if (parameters [2] == "b") {
// OVERRIDE EXPLANATION WASN'T IMMEDIATELY CLEAR
skip.push (i);
continue;
}
wires [parameters [2]] = parameters [0];
skip.push (i);
}
var skipped = 0;
// Use variables with literal values until none are undefined
while (skip.length < input.length && skip.length != skipped) {
skipped = skip.length;
for (var i = 0; i < input.length; i ++) {
var parameters = input [i].split (" ");
if (skip.indexOf (i) != -1) continue;
if (parameters [4] == "b") continue;
if (parameters.length == 3 && parameters [0] in wires) {
wires [parameters [2]] = wires [parameters [0]];
}
if (parameters [0] == "NOT" && parameters [1] in wires) {
skip.push (i);
wires [parameters [3]] = ~ wires [parameters [1]];
continue;
}
if (parameters [0] in wires && parameters [2] in wires) {
skip.push (i);
if (parameters [1] == "OR") wires [parameters [4]] = wires [parameters [0]] | wires [parameters [2]];
if (parameters [1] == "LSHIFT") wires [parameters [4]] = wires [parameters [0]] << wires [parameters [2]];
if (parameters [1] == "RSHIFT") wires [parameters [4]] = wires [parameters [0]] >> wires [parameters [2]];
if (parameters [1] == "AND") wires [parameters [4]] = wires [parameters [0]] & wires [parameters [2]];
continue;
}
if (!isNaN (parameters [0]) && parameters [2] in wires) {
skip.push (i);
if (parameters [1] == "OR") wires [parameters [4]] = parameters [0] | wires [parameters [2]];
if (parameters [1] == "LSHIFT") wires [parameters [4]] = parameters [0] << wires [parameters [2]];
if (parameters [1] == "RSHIFT") wires [parameters [4]] = parameters [0] >> wires [parameters [2]];
if (parameters [1] == "AND") wires [parameters [4]] = parameters [0] & wires [parameters [2]];
continue;
}
if (parameters [0] in wires && !isNaN (parameters [2])) {
skip.push (i);
if (parameters [1] == "OR") wires [parameters [4]] = wires [parameters [0]] | parameters [2];
if (parameters [1] == "LSHIFT") wires [parameters [4]] = wires [parameters [0]] << parameters [2];
if (parameters [1] == "RSHIFT") wires [parameters [4]] = wires [parameters [0]] >> parameters [2];
if (parameters [1] == "AND") wires [parameters [4]] = wires [parameters [0]] & parameters [2];
continue;
}
if (!isNaN (parameters [0]) && !isNaN (parameters [2])) {
skip.push (i);
if (parameters [1] == "OR") wires [parameters [4]] = parameters [0] | parameters [2];
if (parameters [1] == "LSHIFT") wires [parameters [4]] = parameters [0] << parameters [2];
if (parameters [1] == "RSHIFT") wires [parameters [4]] = parameters [0] >> parameters [2];
if (parameters [1] == "AND") wires [parameters [4]] = parameters [0] & parameters [2];
continue;
}
}
}
console.log (wires.a);
alert (wires.a); // 40149