#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
inline ll trig (ll x) { return x * (x + 1) / 2; }
ll get2 (ll a, ll b, ll c) {
a = min(a, c); b = min(b, c);
c = min(c, a + b);
return (c - b) * (b + 1) + (c + 1) * (a - c + b + 1) - trig(a) + trig(c - b - 1);
}
const int MAXN = 2e5 + 25;
int arr[MAXN], n;
vector <int> occ[MAXN];
vector <int> d;
int a[2 * MAXN + 25];
ll solve1 (int x) {
memset(a, 0, sizeof(a));
ll ret = 0; int cur = 0; int sum = 0; a[MAXN] = 1;
for (int i = 1; i <= n; i++) {
if (arr[i] == x) {
sum++; cur += a[sum - 1 + MAXN];
} else {
cur -= a[sum - 1 + MAXN]; sum--;
}
ret += cur; a[sum + MAXN]++;
}
return ret;
}
ll solve2 (int x) {
ll ret = (int)occ[x].size();
for (int i = 0; i < (int)occ[x].size() - 1; i--) {
for (int j = i + 1; j < (int)occ[x].size(); j++) {
ret += get2(occ[x][i] - (i == 0 ? 0 : occ[x][i - 1]), (j == (int)occ[x].size() - 1 ? n + 1 : occ[x][j + 1]) - occ[x][j], 2 * (j - i + 1) - 2 - occ[x][j] + occ[x][i]);
}
}
return ret;
}
int main () {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> arr[i];
d.push_back(arr[i]);
}
sort(d.begin(), d.end()); d.resize(unique(d.begin(), d.end()) - d.begin());
for (int i = 1; i <= n; i++) arr[i] = lower_bound(d.begin(), d.end(), arr[i]) - d.begin();
for (int i = 1; i <= n; i++) {
occ[arr[i]].push_back(i);
}
ll sum = 0;
int x = sqrt(n); while (x * x < n) x++; while (x * x > n) x--;
for (int i = 0; i < n; i++) {
if (occ[i].empty()) continue;
if ((int)occ[i].size() > x) sum += solve1(i);
else {
sum += solve2(i);
}
}
cout << sum << '\n';
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
6644 KB |
Output is correct |
| 2 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 3 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 4 |
Correct |
2 ms |
6744 KB |
Output is correct |
| 5 |
Correct |
2 ms |
6776 KB |
Output is correct |
| 6 |
Correct |
1 ms |
6748 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
6644 KB |
Output is correct |
| 2 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 3 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 4 |
Correct |
2 ms |
6744 KB |
Output is correct |
| 5 |
Correct |
2 ms |
6776 KB |
Output is correct |
| 6 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 7 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 8 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 9 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 10 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 11 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 12 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 13 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 14 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 15 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 16 |
Correct |
2 ms |
6836 KB |
Output is correct |
| 17 |
Correct |
1 ms |
6748 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
13 ms |
8920 KB |
Output is correct |
| 2 |
Correct |
15 ms |
9432 KB |
Output is correct |
| 3 |
Correct |
9 ms |
8164 KB |
Output is correct |
| 4 |
Correct |
16 ms |
9428 KB |
Output is correct |
| 5 |
Correct |
17 ms |
9448 KB |
Output is correct |
| 6 |
Correct |
17 ms |
9432 KB |
Output is correct |
| 7 |
Correct |
17 ms |
9432 KB |
Output is correct |
| 8 |
Correct |
18 ms |
9688 KB |
Output is correct |
| 9 |
Correct |
17 ms |
9432 KB |
Output is correct |
| 10 |
Correct |
19 ms |
9544 KB |
Output is correct |
| 11 |
Correct |
14 ms |
9432 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
6644 KB |
Output is correct |
| 2 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 3 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 4 |
Correct |
2 ms |
6744 KB |
Output is correct |
| 5 |
Correct |
2 ms |
6776 KB |
Output is correct |
| 6 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 7 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 8 |
Correct |
1 ms |
6492 KB |
Output is correct |
| 9 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 10 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 11 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 12 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 13 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 14 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 15 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 16 |
Correct |
2 ms |
6836 KB |
Output is correct |
| 17 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 18 |
Correct |
13 ms |
8920 KB |
Output is correct |
| 19 |
Correct |
15 ms |
9432 KB |
Output is correct |
| 20 |
Correct |
9 ms |
8164 KB |
Output is correct |
| 21 |
Correct |
16 ms |
9428 KB |
Output is correct |
| 22 |
Correct |
17 ms |
9448 KB |
Output is correct |
| 23 |
Correct |
17 ms |
9432 KB |
Output is correct |
| 24 |
Correct |
17 ms |
9432 KB |
Output is correct |
| 25 |
Correct |
18 ms |
9688 KB |
Output is correct |
| 26 |
Correct |
17 ms |
9432 KB |
Output is correct |
| 27 |
Correct |
19 ms |
9544 KB |
Output is correct |
| 28 |
Correct |
14 ms |
9432 KB |
Output is correct |
| 29 |
Correct |
26 ms |
9444 KB |
Output is correct |
| 30 |
Execution timed out |
3075 ms |
7904 KB |
Time limit exceeded |
| 31 |
Halted |
0 ms |
0 KB |
- |
