asa, C++ (gcc) - rextester

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#include<bits/stdc++.h>
using namespace std;
#define pb push_back

int main(){
    int n;
    cin >> n;
    vector <int> v;
    
    for(int i = 0;i < n;i++){
        int x;cin >> x;
        v.pb(x);
    }
    
    sort(v.begin(),v.end());
   
    vector <int> freq;
    
    int cnt = 1;
    
    for(int i = 1;i < n;i++){
        if(v[i] == v[i-1]) cnt++;
        else {
            freq.pb(cnt);
            cnt = 1;
        }
    }
    freq.pb(cnt);
    
    if(freq.size() < 3) cout << 0 << endl;
    else{
        int a = 0,b = 1,c = 2;
        int ans = 0;
       
        while(c < freq.size()){
            
            while(freq[a] > 0 && freq[b] > 0 && freq[c] > 0){
                freq[a]--;
                freq[b]--;
                freq[c]--;
                ans++;
            }

while(c < freq.size() && (freq[a] <= 0 || freq[b] <= 0 || freq[c] <= 0)){
       
                if(freq[a] <= 0) {a++;b++;c++;}
                else if(freq[b] <=0 ) {b++;c++;}
                else if(freq[c] <=0 ) {c++;}
            }
        }
        cout << ans << endl;
    }
        
}

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Compilation time: 1.72 sec, absolute running time: 0.16 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 2,08 sec