Submission #531975

#	Time	Username	Problem	Language	Result	Execution time	Memory
531975		hoanghq2004	Diversity (CEOI21_diversity)	C++14	0 / 100	1 ms	332 KiB

diversity

#include <bits/stdc++.h>
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const int N = 3e5 + 10;

int n, q, cnt[N], a[N];
int maxv;

int main() {
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> n >> q;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    for (int i = 1; i <= n; ++i) maxv = max(maxv, a[i]), ++cnt[a[i]];
    sort(cnt + 1, cnt + maxv + 1);
    long long tot = 0, cur = 0, ans = 0;
    for (int i = 1; i <= maxv; ++i) {
        if (!cnt[i]) continue;
        ans += cur * cnt[i];
        for (int j = 1; j <= cnt[i]; ++j) ans += tot + j;
        tot += cnt[i];
        cur += tot;
    }
    cout << ans;
}

Compilation message (stderr)

diversity.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
diversity.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      |

• Subtask 1: 0 / 4
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 16
• Subtask 5: 0 / 26
• Subtask 6: 0 / 36