volny.petr
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My solution in Javascript. The idea is to iteratively fetch an object and combine it with all the sets that are already in the superset being created:
function powerset(array) {
var i, j, len,
powerset = [[]];
for (i=0; i<array.length; i++) {
for (j=0, len=powerset.length; j<len; j++) {
powerset.push(powerset[j].concat(array[i]));
}
}
return powerset;
}
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Javascript solution inspired by @showell30 comment:
var r2n = { I: 1, V: 5, X: 10, L: 50, C: 100, D: 500, M: 1000, }; function roman2num(roman) { var sum = 0, curr = 0, prev = 0; for (var i=roman.length-1; i>=0; i--) { curr = r2n[roman[i]]; sum += curr >= prev ? curr : -curr; prev = curr; } return sum; } console.log(roman2num(['C','M','I','V']));Output should be: 904
- volny.petr March 10, 2013