-
Notifications
You must be signed in to change notification settings - Fork 0
/
B.cpp
60 lines (52 loc) · 1.11 KB
/
B.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> Pii;
typedef pair<int, ll> Pil;
typedef pair<ll, ll> Pll;
typedef pair<ll, int> Pli;
typedef vector<vector<ll>> Mat;
#define fi first
#define se second
const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll MOD3 = 1812447359;
const ll INF = 1ll << 62;
const double PI = 2 * asin(1);
void yes() { printf("yes\n"); }
void no() { printf("no\n"); }
void Yes() { printf("Yes\n"); }
void No() { printf("No\n"); }
void YES() { printf("YES\n"); }
void NO() { printf("NO\n"); }
int n;
ll a[int(3e5 + 5)], cnt[int(3e5 + 5)];
ll solve() {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
cnt[a[i]]++;
}
ll ans = 0, sum = 0;
for (int i = 0; i <= n; i++) {
ans += cnt[i] * (cnt[i] - 1) * (cnt[i] - 2) / 6;
ans += cnt[i] * (cnt[i] - 1) * sum / 2;
sum += cnt[i];
}
return ans;
}
void reset() {
fill(a, a + n + 1, 0);
fill(cnt, cnt + n + 1, 0);
return;
}
int main() {
int t;
cin >> t;
for (int i = 0; i < t; i++) {
cout << solve() << endl;
reset();
}
return 0;
}