| 比赛 |
USACO2026 JAN G&P2 |
评测结果 |
AAAAAAAAAAAAAA |
| 题目名称 |
Milk Buckets |
最终得分 |
100 |
| 用户昵称 |
xuyuqing |
运行时间 |
1.975 s |
| 代码语言 |
C++ |
内存使用 |
12.85 MiB |
| 提交时间 |
2026-01-24 10:34:17 |
显示代码纯文本
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <vector>
using namespace std;
const int N = 514514;
int t;
int n;
vector<int> nums;
vector<int> magic;
int le[N];
int ri[N];
long long res;
long long leTree[N];
long long riTree[N];
int lowbit (int id) {
return id & (-id);
}
void add (int id, int num, long long *tree) {
for (; id < N; id += lowbit (id)) {
tree[id] += num;
}
}
long long query (int id, long long *tree) {
long long ans = 0;
for (; id > 0; id -= lowbit (id)) {
ans += tree[id];
}
return ans;
}
int main () {
freopen ("Milk.in", "r", stdin);
freopen ("Milk.out", "w", stdout);
cin >> t;
for (int index = 1; index <= t; index++) {
cin >> n;
int num;
nums.clear();
memset (leTree, 0, sizeof (leTree));
memset (riTree, 0 ,sizeof (riTree));
for (int i = 1; i <= n; i++) {
cin >> num;
nums.push_back(num);
}
magic = nums;
sort (magic.begin(), magic.end());
magic.erase(unique (magic.begin(), magic.end()), magic.end());
for (int i = 0; i < n; i++) {
int num = lower_bound(magic.begin(), magic.end(), nums[i]) - magic.begin() + 1;
le[i + 1] = query(num - 1, leTree);
add(num, 1, leTree);
}
for (int i = n - 1; i >= 0; i--) {
int num = lower_bound(magic.begin(), magic.end(), nums[i]) - magic.begin() + 1;
ri[i + 1] = query(num - 1, riTree);
add(num, 1, riTree);
}
res = 0;
for (int i = 1; i <= n; i++) {
res += min (le[i], ri[i]);
}
cout << res << endl;
}
return 0;
}