이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
// #pragma GCC target ("avx,avx2,fma")
// #pragma GCC optimize ("Ofast,inline") // O1 - O2 - O3 - Os - Ofast
// #pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define rep(i, a, b) for (int i = (a); i < (b); ++i)
#define per(i, a, b) for (int i = (b - 1); i >= (a); --i)
#define trav(a, x) for (auto &a : x)
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back
#define debug(x) cout << #x << " = " << x << endl
#define umap unordered_map
#define uset unordered_set
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
typedef vector<pll> vpll;
const int INF = 1'000'000'007;
int n, arr[300001], q;
int main() {
cin.tie(0)->sync_with_stdio(0);
cin.exceptions(cin.failbit);
umap<int, int> ttoi;
vii types;
cin >> n >> q;
rep(i, 0, n) {
int type;
cin >> type;
if (!ttoi.count(type)) {
types.emplace_back(0, sz(ttoi));
ttoi[type] = sz(types) - 1;
}
++types[ttoi[type]].first;
}
sort(all(types));
n = sz(types);
int lo = 0, hi = n - 1;
bool side = 0;
ll ans = 0;
trav(item, types) {
int type, cnt;
tie(cnt, type) = item;
if (side)
arr[hi--] = cnt;
else
arr[lo++] = cnt;
side ^= 1;
ans += ll(cnt) * (cnt + 1) / 2;
}
if (q == 1) {
rep(i, 0, n) rep(j, i + 1, n) ans += ll(j - i + 1) * arr[i] * arr[j];
cout << ans << endl;
}
return 0;
}
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