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2016 Update

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This commit is contained in:
Tina Müller 2016-12-05 22:15:40 +01:00
parent 948b86eafa
commit dcf5d15da3
7965 changed files with 139854 additions and 31002 deletions
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53
Task/Combinations-with-repetitions/JavaScript/combinations-with-repetitions-2.js
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@ -1,8 +1,45 @@
iced iced
iced jam
iced plain
jam jam
jam plain
plain plain
6 combos
pick 3 out of 10: 220 combos
(function () {
// n -> [a] -> [[a]]
function combsWithRep(n, lst) {
return n ? (
lst.length ? combsWithRep(n - 1, lst).map(function (t) {
return [lst[0]].concat(t);
}).concat(combsWithRep(n, lst.slice(1))) : []
) : [[]];
};
// If needed, we can derive a significantly faster version of
// the simple recursive function above by memoizing it
// f -> f
function memoized(fn) {
m = {};
return function (x) {
var args = [].slice.call(arguments),
strKey = args.join('-');
v = m[strKey];
if ('u' === (typeof v)[0])
m[strKey] = v = fn.apply(null, args);
return v;
}
}
// [m..n]
function range(m, n) {
return Array.apply(null, Array(n - m + 1)).map(function (x, i) {
return m + i;
});
}
return [
combsWithRep(2, ["iced", "jam", "plain"]),
// obtaining and applying a memoized version of the function
memoized(combsWithRep)(3, range(1, 10)).length
];
})();

5
Task/Combinations-with-repetitions/JavaScript/combinations-with-repetitions-3.js Normal file
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@ -0,0 +1,5 @@
[
[["iced", "iced"], ["iced", "jam"], ["iced", "plain"],
["jam", "jam"], ["jam", "plain"], ["plain", "plain"]],
220
]

24
Task/Combinations-with-repetitions/JavaScript/combinations-with-repetitions.js
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@ -1,24 +0,0 @@
<html><head><title>Donuts</title></head>
<body><pre id='x'></pre><script type="application/javascript">
function disp(x) {
var e = document.createTextNode(x + '\n');
document.getElementById('x').appendChild(e);
}
function pick(n, got, pos, from, show) {
var cnt = 0;
if (got.length == n) {
if (show) disp(got.join(' '));
return 1;
}
for (var i = pos; i < from.length; i++) {
got.push(from[i]);
cnt += pick(n, got, i, from, show);
got.pop();
}
return cnt;
}
disp(pick(2, [], 0, ["iced", "jam", "plain"], true) + " combos");
disp("pick 3 out of 10: " + pick(3, [], 0, "a123456789".split(''), false) + " combos");
</script></body></html>