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<html> | |
<body> | |
<h1 id="title">Combinations</h1> | |
<input type="text" id="numbers" value="1,2,3,4,5" /> | |
<input type="text" id="stars" value="1,2,3" /> | |
<input type="submit" id="byBtn" value="Change" onclick="change()" /> | |
<div id="info"></div> | |
<div id="combinations"></div> | |
<script> | |
function change() { | |
var numbers = document.getElementById('numbers').value.split(","); | |
var stars = document.getElementById('stars').value.split(","); | |
var c = document.getElementById('combinations'); | |
var info = document.getElementById('info'); | |
var myTable = "<table border='1'><tr><td>Numbers</td><td>Stars</td></tr>"; | |
var start = performance.now(); | |
var numberCombinations = combinations(numbers.sort(), 5); | |
var starCombinations = combinations(stars.sort(), 2); | |
for (var i = 0; i < numberCombinations.length; i++) { | |
for (var j = 0; j < starCombinations.length; j++) { | |
myTable += "<tr><td>" +numberCombinations[i] + "</td><td>" + starCombinations[j] + "</td></tr>"; | |
} | |
} | |
info.innerHTML = "<br><br>Combinations: " + (numberCombinations.length * starCombinations.length) + "<br>" + logTime(start) + "<br><br>"; | |
c.innerHTML = myTable + "</table>"; | |
} | |
function logTime(start) { | |
var end = performance.now(); | |
var time = end - start; | |
return 'Execution time: ' + time + ' ms'; | |
} | |
function combinations(set, k) { | |
var i, j, combs, head, tailcombs; | |
if (!set || !k || k > set.length || k <= 0) { | |
return []; | |
} | |
if (k == set.length) { | |
return [set]; | |
} | |
if (k == 1) { | |
combs = []; | |
for (i = 0; i < set.length; i++) { | |
combs.push([set[i]]); | |
} | |
return combs; | |
} | |
combs = []; | |
for (i = 0; i < set.length - k + 1; i++) { | |
head = set.slice(i, i + 1); | |
tailcombs = combinations(set.slice(i + 1), k - 1); | |
for (j = 0; j < tailcombs.length; j++) { | |
combs.push(head.concat(tailcombs[j])); | |
} | |
} | |
return combs; | |
} | |
</script> | |
</body> | |
</html> |
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