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/* The Great Computer Language Shootout
http://shootout.alioth.debian.org/
contributed by Isaac Gouy */
function fannkuch(n) {
var check = 0;
var perm = Array(n);
var perm1 = Array(n);
var count = Array(n);
var maxPerm = Array(n);
var maxFlipsCount = 0;
var m = n - 1;
for (var i = 0; i < n; i++) perm1[i] = i;
var r = n;
while (true) {
// write-out the first 30 permutations
if (check < 30){
var s = "";
for(var i=0; i<n; i++) s += (perm1[i]+1).toString();
check++;
}
while (r != 1) { count[r - 1] = r; r--; }
if (!(perm1[0] == 0 || perm1[m] == m)) {
for (var i = 0; i < n; i++) perm[i] = perm1[i];
var flipsCount = 0;
var k;
while (!((k = perm[0]) == 0)) {
var k2 = (k + 1) >> 1;
for (var i = 0; i < k2; i++) {
var temp = perm[i]; perm[i] = perm[k - i]; perm[k - i] = temp;
}
flipsCount++;
}
if (flipsCount > maxFlipsCount) {
maxFlipsCount = flipsCount;
for (var i = 0; i < n; i++) maxPerm[i] = perm1[i];
}
}
while (true) {
if (r == n) return maxFlipsCount;
var perm0 = perm1[0];
var i = 0;
while (i < r) {
var j = i + 1;
perm1[i] = perm1[j];
i = j;
}
perm1[r] = perm0;
count[r] = count[r] - 1;
if (count[r] > 0) break;
r++;
}
}
}
var n = 8;
var ret = fannkuch(n);
assertEq(ret, 22)
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