int partition(vector<string> &nuts, vector<string> &bolts, int s, int e, Comparator compare) {
for(int i = s; i <= e; i++) {
if(compare.cmp(nuts[s], bolts[i]) == 0) {
swap(bolts[s], bolts[i]);
break;
}
}
int p = s+1, i = s+1;
while(i <= e) {
if(compare.cmp(nuts[s], bolts[i]) == 1) {
swap(bolts[p], bolts[i]);
p++;
}
i++;
}
swap(bolts[s], bolts[--p]);
swap(nuts[s], nuts[p]);
i = s;
int j = p+1;
while(i <= p-1 && j <= e) {
if(compare.cmp(nuts[i], bolts[p]) == 1) {
swap(nuts[i], nuts[j]);
j++;
} else {
i++;
}
}
return p;
}
void sort(vector<string> &nuts, vector<string> &bolts, int left, int right, Comparator compare) {
if (left >= right) return;
fprintf(stderr, "%d %d ", left, right);
int ni, nj, bi, bj, m;
ni = bi = left; nj = bj = right;
m = (left + right) >> 1;
// recover bolts
int bp = 0;
while (bi < bj) {
while (bi < bj && compare.cmp(nuts[m], bolts[bi]) < 0) bi ++;
while (bi < bj && compare.cmp(nuts[m], bolts[bj]) > 0) bj --;
if (compare.cmp(nuts[m], bolts[bi]) == 0) bp = bj; else
if (compare.cmp(nuts[m], bolts[bj]) == 0) bp = bi;
if (bi < bj) {
swap(bolts, bi, bj);
bi ++; bj --;
}
// print(bolts);
}
// printf("%d %d\n", bi, bp);
while (compare.cmp(nuts[m], bolts[bi]) < 0) bi ++;
fprintf(stderr, "%d %d ", bi, bp);
if (bp < bi) { swap(bolts, bp, bi - 1); bp = bi - 1; } else
if (bp > bi) { swap(bolts, bp, bi); bp = bi; }
// print(bolts);
// recover nuts
swap(nuts, m, bp);
m = bp;
int np = 0;
while (ni < m) {
while (ni < m && compare.cmp(nuts[ni], bolts[m]) > 0) ni ++;
while (ni < m && compare.cmp(nuts[nj], bolts[m]) < 0) nj --;
if (ni < m) {
swap(nuts, ni, nj);
ni ++; nj --;
}
}
// print(nuts);
fprintf(stderr, "%d|", m);
sort(nuts, bolts, left, m - 1, compare);
sort(nuts, bolts, m + 1, right, compare);
}
void quicksort(vector<string>& nuts, vector<string>& bolts, int begin, int end, Comparator cmp) {
if (begin >= end) return;
int pivot_pos;
int left = 0;
for (int i = begin; i <= end; ++i) {
int res = cmp.cmp(nuts[begin], bolts[i]);
if (res == 0) {
// find the corresponding place for bolt
pivot_pos = i;
} else if (res == 1) {
// find number of smaller bolts
++left;
}
}
// put pivot into position
swap(nuts, begin, begin+left);
swap(bolts, pivot_pos, begin+left);
pivot_pos = begin + left;
// do mutual quicksort
int i = begin, j = end;
while (i < pivot_pos && pivot_pos < j) {
while (i < pivot_pos && cmp.cmp(nuts[pivot_pos], bolts[i]) == 1) ++i;
while (j > pivot_pos && cmp.cmp(nuts[pivot_pos], bolts[j]) == -1) --j;
if (i < j) {
swap(bolts, i, j);
++i;
--j;
}
}
i = begin, j = end;
while (i < pivot_pos && pivot_pos < j) {
while (i < pivot_pos && cmp.cmp(nuts[i], bolts[pivot_pos]) == -1) ++i;
while (j > pivot_pos && cmp.cmp(nuts[j], bolts[pivot_pos]) == 1) --j;
if (i < j) {
swap(nuts, i, j);
++i;
--j;
}
}
quicksort(nuts, bolts, begin, pivot_pos-1, cmp);
quicksort(nuts, bolts, pivot_pos+1, end, cmp);
}
// All the smaller elements should be in the left side of the pivot,
// and all the bigger elements should in the right side of the pivot.
int partition(vector<string>& arr,
int left, int right, const string& pivot,
Comparator& compare) {
for (int i = left; i < right; ) {
if (compare.cmp(arr[i], pivot) == SMALLER || // Smaller.
(compare.cmp(arr[i], pivot) == REVERSE &&
compare.cmp(pivot, arr[i]) == BIGGER)) {
swap(arr[left++], arr[i++]);
} else if (compare.cmp(arr[i], pivot) == BIGGER || // Bigger.
(compare.cmp(arr[i], pivot) == REVERSE &&
compare.cmp(pivot, arr[i]) == SMALLER)) {
++i;
} else { // Equal.
swap(arr[i], arr[right]);
}
}
// Put the pivot to the partition index.
swap(arr[left], arr[right]);
// Return the partition index of an array.
return left;
}
int partition(vector<string> &str, string pivot, Comparator compare, int l, int u){
int mid = l; // middle
for (int i = l + 1; i <= u; i++) {
if (compare.cmp(str[i], pivot) == -1 ||
compare.cmp(pivot, str[i]) == 1) {
// str[i] smaller than pivot
mid++;
swap(str, i, mid);
} else if (compare.cmp(str[i], pivot) == 0 ||
compare.cmp(pivot, str[i]) == 0) {
// swap nuts[l]/bolts[l] with pivot
// l位置放pivot
swap(str, i, l);
i--;
}
}
// move pivot to proper index
swap(str, mid, l);
return mid;
}
/**
* @param nuts: a vector of integers
* @param bolts: a vector of integers
* @param compare: a instance of Comparator
* @return: nothing
*/
void sortNutsAndBoltsN2(vector<string> &nuts, vector<string> &bolts, Comparator compare) {
int n = nuts.size();
int m = bolts.size();
for (int i = 0; i < n - 1; i ++) {
int j = i;
while (j < m && compare.cmp(nuts[i], bolts[j])) j ++;
string temp = bolts[j];
bolts[j] = bolts[i];
bolts[i] = temp;
}
for (int i = 0; i < n; i ++) {
printf("%s ", bolts[i].c_str());
}
}