Submission #989492

#	Time	Username	Problem	Language	Result	Execution time	Memory
989492		yoav_s	Diversity (CEOI21_diversity)	C++17	0 / 100	1 ms	2652 KiB

diversity

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef vector<ll> v;
typedef vector<v> vv;
typedef vector<vv> vvv;
typedef pair<ll,ll> p;
typedef vector<p> vp;
typedef vector<vp> vvp;
typedef vector<vvp> vvvp;
typedef pair<ll, p> tri;
typedef vector<tri> vtri;
typedef vector<vtri> vvtri;
typedef vector<vvtri> vvvtri;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;
 
#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()
 
const ll INF = 1e18;
const ll mod = 1e9 + 7;
const ll maxValue = 3e5;
 
ll evaluate(v &segments)
{
    ll N = 0;
    for (ll x : segments) N += x;
    ll l = 0;
    ll res = 0;
    for (ll x : segments)
    {
        ll r = l + x - 1;
        res += ((r - l + 1) * (r - l + 2)) / 2 + l * (N - r - 1) + (r - l + 1) * l + (r - l + 1) * (N - r - 1);
        l += x;
    }
    return res;
}
 
int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    ll N, Q;
    cin >> N >> Q;
    v a(N);
    for (ll i = 0; i < N; i++) cin >> a[i];
    sort(all(a));
    v histogram(maxValue + 1, 0);
    for (ll x : a) histogram[x]++;
    v segments;
    for (ll i = 0; i <= maxValue; i++) if (histogram[i] > 0) segments.pb(histogram[i]);
    sort(all(segments));
    v segOrder;
    for (ll i = 0; i < segments.size() / 2; i++)
    {
        segOrder.pb(segments[i]);
        segOrder.pb(segments[segments.size() - 1 - i]);
    }
    if (N % 2 == 1) segOrder.pb(segments[segments.size() / 2]);
    ll mini = evaluate(segOrder);
    /*while (next_permutation(all(segments)))
    {
        mini = min(mini, evaluate(segments));
    }*/
    cout << mini << "\n";
    return 0;
}

Compilation message (stderr)

diversity.cpp: In function 'int main()':
diversity.cpp:60:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |     for (ll i = 0; i < segments.size() / 2; i++)
      |                    ~~^~~~~~~~~~~~~~~~~~~~~

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