本文共 1501 字,大约阅读时间需要 5 分钟。
?n????????????1?n?????????????????????????????????
?????????????????????????????????????Fenwick Tree??????????????????????????
???????
#include#include #include using namespace std;int lowbit(int x) { return x & -x;}void add(int x, int c, int n, vector & tr) { while (x <= n) { tr[x] += c; x += lowbit(x); }}int sum(int x, int n, const vector & tr) { int res = 0; while (x > 0) { res += tr[x]; x -= lowbit(x); } return res;}int main() { int n; vector a(n + 1); for (int i = 2; i <= n; ++i) { a[i] = 0; } for (int i = 1; i <= n; ++i) { int val; scanf("%d", &val); a[i] = val; } vector tr(n + 1, 1); // ???????????????1 vector ans(n + 1); for (int i = n; i >= 1; --i) { int k = a[i] + 1; int l = 1, r = n; while (l < r) { int mid = (l + r + 1) / 2; int s = sum(mid, n, tr); if (s >= k) { r = mid; } else { l = mid; } } ans[i] = l; add(l, -1, n, tr); } for (int i = 1; i <= n; ++i) { printf("%d\n", ans[i]); } return 0; }
?????????????????????????????????
转载地址:http://satn.baihongyu.com/