Submission #1125320

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125320		Peter2017	Diversity (CEOI21_diversity)	C++20	64 / 100	32 ms	4604 KiB

diversity

#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define pii pair<int,int>
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define mem(a, b) memset(a, b, sizeof(a))
#define name "test"

using namespace std;

const int N = 3e5 + 5;
const int mod = 1e9 + 7;

template <typename T1, typename T2> bool maxi(T1 &a, T2 b){if (a < b){a = b; return 1;} return 0;}
template <typename T1, typename T2> bool mini(T1 &a, T2 b){if (a > b){a = b; return 1;} return 0;}

int n;
int q;
int a[N];
int L[N];
int R[N];
int cnt[N];
deque<int> dq;
vector<int> value;

void load(){
    cin.tie(0)->sync_with_stdio(0);
    if (fopen(name".inp", "r")){
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }
}

void input(){
    cin >> n >> q;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
        cnt[a[i]]++;
    }
    for (int i = 1; i <= q; i++)
        cin >> L[i] >> R[i];
}

ll cal(ll n){
    return n * (n + 1) / 2;
}

void solve(){
    int MAX = 3e5;
    for (int i = MAX; i >= 1; i--) if (cnt[i]) value.push_back(cnt[i]);
    sort(value.begin(), value.end(), greater<int>());
    bool type = 0;
    for (int x : value){
        if (type == 0) dq.push_front(x);
        else dq.push_back(x);
        type ^= 1;
    }
    value.clear();
    while (dq.size()){
        value.push_back(dq.front());
        dq.pop_front();
    }
    ll ans = 0;
    int sum = n;
    for (int x : value){
        for (int j = 1; j <= x; j++){
            if (j == 1) ans += 1LL * (n - sum + 1) * sum;
            else ans += sum;
            sum--;
        }
    }
    cout << ans;
}

int main(){
    load();
    input();
    solve();
}

Compilation message (stderr)

diversity.cpp: In function 'void load()':
diversity.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
diversity.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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