Submission #685002

#	Time	Username	Problem	Language	Result	Execution time	Memory
685002		moonhero	Diversity (CEOI21_diversity)	C++14	0 / 100	1 ms	212 KiB

diversity

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const long long N = 3e5 + 5;
long long cont (long long r) {
    return (r + 1) * (r) / 2;
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, q; cin >> n >> q;
    vector <int> b(n), a;
    map <int, int> cnt;
    for (int i = 0; i < n; i++) {
        cin >> b[i];
        cnt[b[i]]++;
    } for (auto it : cnt) a.push_back(it.second);
    n = a.size();
    int l, r; cin >> l >> r;
    ll ans = 0;
    for (int i = 0; i < a.size(); i++) {
        ll k = 2, nwres = a[i];
        for (int j = i + 1; j < a.size(); j++) {
            nwres += k * a[j], k++;
        } ans += nwres * a[i] - cont(a[i] - 1);
    } map <vector <int>, int> used;
    used[a] = 1;
    while (next_permutation(a.begin(), a.end())) {
        if (used[a]) continue;
        used[a] = 1;
        ll x = 0;
        for (int i = 0; i < a.size(); i++) {
            ll k = 2, nwres = a[i];
            for (int j = i + 1; j < a.size(); j++) {
                nwres += k * a[j], k++;
            } x += nwres * a[i] - cont(a[i] - 1);
        } ans = min(ans, x);
    } cout << ans << '\n';
    return 0;
}

Compilation message (stderr)

diversity.cpp: In function 'int main()':
diversity.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 0; i < a.size(); i++) {
      |                     ~~^~~~~~~~~~
diversity.cpp:23:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for (int j = i + 1; j < a.size(); j++) {
      |                             ~~^~~~~~~~~~
diversity.cpp:32:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for (int i = 0; i < a.size(); i++) {
      |                         ~~^~~~~~~~~~
diversity.cpp:34:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |             for (int j = i + 1; j < a.size(); j++) {
      |                                 ~~^~~~~~~~~~

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