${[...Array(81).keys()].map(i => {
let { row, col } = i2rc(i);
return ``;
}).join("")}
${!controls ? '' : `
`}
`;
container.innerHTML = html;
let fields = container.querySelectorAll("input.js-field");
fields.forEach(input => {
input.addEventListener("click", ev => {
input.focus();
input.select();
});
input.addEventListener("focus", ev => {
let index = +input.dataset.index;
log(container, `Allowed digits:
${b2ds(analyze(this.readBoard()).allowed[index]).join(", ")}`);
});
input.addEventListener("keydown", ev => {
let idx = +input.dataset.index;
if (ev.keyCode >= 48 && ev.keyCode <= 57) {
input.value = String.fromCharCode(ev.keyCode);
if (input.value == "0") input.value = "";
input.select();
ev.preventDefault();
} else {
let parent = input.parentNode;
let next;
switch (ev.keyCode) {
case 38: // ↑
next = idx - 9; break;
case 40: // ↓
next = idx + 9; break;
case 39: // →
next = idx + 1; break;
case 37: // ←
next = idx - 1; break;
}
if (next != null) {
if (next < 0) next += 81;
next %= 81;
next = parent.querySelector(`input[data-index="${next}"]`);
next.focus();
next.select();
ev.preventDefault();
}
}
});
});
}
pause() {
clearTimeout(this._playTimer);
this.container.classList.add("paused");
}
continue() {
this.container.classList.remove("paused");
this._playCont();
}
readBoard(init = false) {
return [...this.container.querySelectorAll("input.js-field")]
.map(el => {
if (init) el.classList.toggle("init", el.value);
return el.value ? d2b(parseInt(el.value, 10)) : 0;
});
}
writeBoard(values, init = false) {
let el = this.container;
[...el.querySelectorAll("input.js-field")].forEach((el, i) => {
el.value = values[i] || "";
el.classList.remove("current");
if (init) {
el.classList.toggle("init", values[i]);
}
});
if (init) {
this._initBoard = values;
this._reset();
}
}
writeBytes(values, init = false) {
this.writeBoard(values.map(b2d), init);
}
clearBoard() {
let el = this.container;
[...el.querySelectorAll("input.js-field")].forEach(el => {
el.value = "";
el.classList.remove("init");
});
this._reset();
}
reset() {
this.writeBoard(this._initBoard || [], true);
}
_reset() {
let el = this.container;
clearTimeout(this._playTimer);
el.classList.remove("solved", "playing", "paused");
log(el, "");
}
solve() {
let self = this;
let el = self.container;
let board = self.readBoard(true);
let backtrack = 0;
let guesswork = 0;
let dcount = 0;
let time = Date.now();
if (solve()) {
stats();
self.writeBytes(board);
el.classList.add("solved");
} else {
stats();
alert("no solution");
}
function solve() {
let { index, moves, len } = analyze(board);
if (index == null) return true;
if (len > 1) guesswork++;
for (let m = 1; moves; m <<= 1) {
if (moves & m) {
dcount++;
board[index] = m;
if (solve()) return true;
moves ^= m;
}
}
board[index] = 0;
++backtrack;
return false;
}
function stats() {
log(el, `${dcount} digits placed