#include <iostream>
#include <vector>
#include <algorithm>
typedef long long i64;
using namespace std;
const int N = 3e5 + 5;
i64 a [N];
struct FenwickTree {
vector<int> bit;
const int N;
FenwickTree (int n) : N (n + 5) {
bit.clear(); bit.resize(N);
}
void update (int idx, int delta) {
for (; idx < N; idx += idx & (- idx)) {
bit[idx] += delta;
}
}
int query (int idx) {
int res = 0;
for (; idx > 0; idx -= idx & (- idx)) {
res += bit[idx];
}
return res;
}
int range_sum (int lo, int hi) {
return query (hi) - query (lo -1);
}
};
int main () {
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
vector<i64> comp;
for (int i = 0; i < n; i++) {
cin >> a[i];
comp.emplace_back(a[i]);
}
sort (comp.begin(), comp.end());
comp.erase(unique(comp.begin(), comp.end()), comp.end());
FenwickTree menor (n), maior (n);
for (int i = 0; i < n; i++) {
a[i] = (lower_bound (comp.begin(), comp.end(), a[i]) - comp.begin() + 1);
maior.update(a[i], +1);
}
i64 res = 0;
for (int i = 0; i < n; i++) {
maior.update(a[i], -1);
res += 1LL * menor.range_sum (0, a[i] - 1) * maior.range_sum (0, a[i] - 1);
menor.update(a[i], +1);
}
cout << res << '\n';
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
118 ms |
7396 KB |
Output is correct |
| 3 |
Correct |
125 ms |
7548 KB |
Output is correct |
| 4 |
Correct |
115 ms |
7400 KB |
Output is correct |
| 5 |
Correct |
116 ms |
7396 KB |
Output is correct |
| 6 |
Correct |
118 ms |
7396 KB |
Output is correct |
| 7 |
Correct |
117 ms |
7396 KB |
Output is correct |
| 8 |
Correct |
117 ms |
7396 KB |
Output is correct |
| 9 |
Correct |
114 ms |
7396 KB |
Output is correct |
| 10 |
Correct |
113 ms |
7396 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
67 ms |
7400 KB |
Output is correct |
| 2 |
Correct |
72 ms |
7400 KB |
Output is correct |
| 3 |
Correct |
69 ms |
7408 KB |
Output is correct |
| 4 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 5 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 6 |
Correct |
68 ms |
7400 KB |
Output is correct |
| 7 |
Correct |
68 ms |
7408 KB |
Output is correct |
| 8 |
Correct |
72 ms |
7412 KB |
Output is correct |
| 9 |
Correct |
66 ms |
7400 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
67 ms |
7400 KB |
Output is correct |
| 2 |
Correct |
72 ms |
7400 KB |
Output is correct |
| 3 |
Correct |
69 ms |
7408 KB |
Output is correct |
| 4 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 5 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 6 |
Correct |
68 ms |
7400 KB |
Output is correct |
| 7 |
Correct |
68 ms |
7408 KB |
Output is correct |
| 8 |
Correct |
72 ms |
7412 KB |
Output is correct |
| 9 |
Correct |
66 ms |
7400 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| 11 |
Correct |
82 ms |
7396 KB |
Output is correct |
| 12 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 13 |
Correct |
82 ms |
7392 KB |
Output is correct |
| 14 |
Correct |
84 ms |
7428 KB |
Output is correct |
| 15 |
Correct |
84 ms |
7396 KB |
Output is correct |
| 16 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 17 |
Correct |
80 ms |
7396 KB |
Output is correct |
| 18 |
Correct |
59 ms |
7400 KB |
Output is correct |
| 19 |
Correct |
66 ms |
7408 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
5 ms |
384 KB |
Output is correct |
| 7 |
Correct |
5 ms |
384 KB |
Output is correct |
| 8 |
Correct |
5 ms |
384 KB |
Output is correct |
| 9 |
Correct |
5 ms |
384 KB |
Output is correct |
| 10 |
Correct |
5 ms |
288 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
5 ms |
384 KB |
Output is correct |
| 7 |
Correct |
5 ms |
384 KB |
Output is correct |
| 8 |
Correct |
5 ms |
384 KB |
Output is correct |
| 9 |
Correct |
5 ms |
384 KB |
Output is correct |
| 10 |
Correct |
5 ms |
288 KB |
Output is correct |
| 11 |
Correct |
9 ms |
640 KB |
Output is correct |
| 12 |
Correct |
9 ms |
640 KB |
Output is correct |
| 13 |
Correct |
9 ms |
640 KB |
Output is correct |
| 14 |
Correct |
10 ms |
640 KB |
Output is correct |
| 15 |
Correct |
9 ms |
640 KB |
Output is correct |
| 16 |
Correct |
9 ms |
640 KB |
Output is correct |
| 17 |
Correct |
9 ms |
640 KB |
Output is correct |
| 18 |
Correct |
9 ms |
640 KB |
Output is correct |
| 19 |
Correct |
7 ms |
640 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
67 ms |
7400 KB |
Output is correct |
| 2 |
Correct |
72 ms |
7400 KB |
Output is correct |
| 3 |
Correct |
69 ms |
7408 KB |
Output is correct |
| 4 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 5 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 6 |
Correct |
68 ms |
7400 KB |
Output is correct |
| 7 |
Correct |
68 ms |
7408 KB |
Output is correct |
| 8 |
Correct |
72 ms |
7412 KB |
Output is correct |
| 9 |
Correct |
66 ms |
7400 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| 11 |
Correct |
82 ms |
7396 KB |
Output is correct |
| 12 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 13 |
Correct |
82 ms |
7392 KB |
Output is correct |
| 14 |
Correct |
84 ms |
7428 KB |
Output is correct |
| 15 |
Correct |
84 ms |
7396 KB |
Output is correct |
| 16 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 17 |
Correct |
80 ms |
7396 KB |
Output is correct |
| 18 |
Correct |
59 ms |
7400 KB |
Output is correct |
| 19 |
Correct |
66 ms |
7408 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| 21 |
Correct |
140 ms |
7432 KB |
Output is correct |
| 22 |
Correct |
137 ms |
7396 KB |
Output is correct |
| 23 |
Correct |
135 ms |
7396 KB |
Output is correct |
| 24 |
Correct |
140 ms |
7404 KB |
Output is correct |
| 25 |
Correct |
138 ms |
7392 KB |
Output is correct |
| 26 |
Correct |
138 ms |
7392 KB |
Output is correct |
| 27 |
Correct |
139 ms |
7392 KB |
Output is correct |
| 28 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 29 |
Correct |
89 ms |
7532 KB |
Output is correct |
| 30 |
Correct |
4 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
118 ms |
7396 KB |
Output is correct |
| 3 |
Correct |
125 ms |
7548 KB |
Output is correct |
| 4 |
Correct |
115 ms |
7400 KB |
Output is correct |
| 5 |
Correct |
116 ms |
7396 KB |
Output is correct |
| 6 |
Correct |
118 ms |
7396 KB |
Output is correct |
| 7 |
Correct |
117 ms |
7396 KB |
Output is correct |
| 8 |
Correct |
117 ms |
7396 KB |
Output is correct |
| 9 |
Correct |
114 ms |
7396 KB |
Output is correct |
| 10 |
Correct |
113 ms |
7396 KB |
Output is correct |
| 11 |
Correct |
67 ms |
7400 KB |
Output is correct |
| 12 |
Correct |
72 ms |
7400 KB |
Output is correct |
| 13 |
Correct |
69 ms |
7408 KB |
Output is correct |
| 14 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 15 |
Correct |
69 ms |
7400 KB |
Output is correct |
| 16 |
Correct |
68 ms |
7400 KB |
Output is correct |
| 17 |
Correct |
68 ms |
7408 KB |
Output is correct |
| 18 |
Correct |
72 ms |
7412 KB |
Output is correct |
| 19 |
Correct |
66 ms |
7400 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| 21 |
Correct |
82 ms |
7396 KB |
Output is correct |
| 22 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 23 |
Correct |
82 ms |
7392 KB |
Output is correct |
| 24 |
Correct |
84 ms |
7428 KB |
Output is correct |
| 25 |
Correct |
84 ms |
7396 KB |
Output is correct |
| 26 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 27 |
Correct |
80 ms |
7396 KB |
Output is correct |
| 28 |
Correct |
59 ms |
7400 KB |
Output is correct |
| 29 |
Correct |
66 ms |
7408 KB |
Output is correct |
| 30 |
Correct |
4 ms |
384 KB |
Output is correct |
| 31 |
Correct |
5 ms |
384 KB |
Output is correct |
| 32 |
Correct |
5 ms |
384 KB |
Output is correct |
| 33 |
Correct |
5 ms |
384 KB |
Output is correct |
| 34 |
Correct |
5 ms |
384 KB |
Output is correct |
| 35 |
Correct |
5 ms |
384 KB |
Output is correct |
| 36 |
Correct |
5 ms |
384 KB |
Output is correct |
| 37 |
Correct |
5 ms |
384 KB |
Output is correct |
| 38 |
Correct |
5 ms |
384 KB |
Output is correct |
| 39 |
Correct |
5 ms |
384 KB |
Output is correct |
| 40 |
Correct |
5 ms |
288 KB |
Output is correct |
| 41 |
Correct |
9 ms |
640 KB |
Output is correct |
| 42 |
Correct |
9 ms |
640 KB |
Output is correct |
| 43 |
Correct |
9 ms |
640 KB |
Output is correct |
| 44 |
Correct |
10 ms |
640 KB |
Output is correct |
| 45 |
Correct |
9 ms |
640 KB |
Output is correct |
| 46 |
Correct |
9 ms |
640 KB |
Output is correct |
| 47 |
Correct |
9 ms |
640 KB |
Output is correct |
| 48 |
Correct |
9 ms |
640 KB |
Output is correct |
| 49 |
Correct |
7 ms |
640 KB |
Output is correct |
| 50 |
Correct |
4 ms |
384 KB |
Output is correct |
| 51 |
Correct |
140 ms |
7432 KB |
Output is correct |
| 52 |
Correct |
137 ms |
7396 KB |
Output is correct |
| 53 |
Correct |
135 ms |
7396 KB |
Output is correct |
| 54 |
Correct |
140 ms |
7404 KB |
Output is correct |
| 55 |
Correct |
138 ms |
7392 KB |
Output is correct |
| 56 |
Correct |
138 ms |
7392 KB |
Output is correct |
| 57 |
Correct |
139 ms |
7392 KB |
Output is correct |
| 58 |
Correct |
83 ms |
7396 KB |
Output is correct |
| 59 |
Correct |
89 ms |
7532 KB |
Output is correct |
| 60 |
Correct |
4 ms |
384 KB |
Output is correct |
| 61 |
Correct |
183 ms |
7392 KB |
Output is correct |
| 62 |
Correct |
181 ms |
7388 KB |
Output is correct |
| 63 |
Correct |
184 ms |
7460 KB |
Output is correct |
| 64 |
Correct |
178 ms |
7392 KB |
Output is correct |
| 65 |
Correct |
213 ms |
7396 KB |
Output is correct |
| 66 |
Correct |
179 ms |
7392 KB |
Output is correct |
| 67 |
Correct |
181 ms |
7392 KB |
Output is correct |
| 68 |
Correct |
177 ms |
7392 KB |
Output is correct |
| 69 |
Correct |
140 ms |
7392 KB |
Output is correct |
| 70 |
Correct |
5 ms |
384 KB |
Output is correct |
