bool findx(SqList *L, int target){
int l = 0, r = L->length - 1;
while(l<=r){
int mid = (l+r)/2;
if(L->data[mid] == target){
int temp = L->data[mid];
L->data[mid] = L->data[mid+1];
L->data[mid+1] = temp;
return true;
}
else if(L->data[mid]<target)
l = mid + 1;
else
r = mid - 1;
}
return false;
}