Submission #23623928

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define u unsigned
#define ull unsigned long long
#define ld long double
#define pb push_back
#define fasterInOut ios::sync_with_stdio(false); cin.tie(0);
#define pi acos(-1)
#define f(i,a,b) for(int i=(a);i<=(b);i++)
#define fr(i,a,b) for(int i=(a);i>=(b);i--)
#define MAX 1000000

void function(int x);

int main()
{
    #ifndef ONLINE_JUDGE
    freopen("C:/Users/ASUS/Desktop/inout/input.txt", "r", stdin);
    freopen("C:/Users/ASUS/Desktop/inout/output.txt", "w", stdout);
    #endif

    int n;
    cin>>n;
    ll arr[n+1];
    for(int i=0;i<n;i++){
    	cin>>arr[i];
    }
    ll ans=(n*(n-1))/2;
    //cout<<ans<<endl;
    sort(arr, arr+n);
    /*for(int i=0;i<n;i++){
    	cout<<arr[i]<<" ";
    }
    cout<<endl;*/
    int cnt=1;
    ll x=arr[0];
    for(int i=1;i<n;i++){
    	if(arr[i]==x)
    		cnt++;
    	if(arr[i]!=x){
    		if(cnt>1){
    			//cout<<cnt<<endl;
    			ans=ans-((cnt*(cnt-1))/2);
    		}
    		x=arr[i];
    		cnt=1;
    	}
    }
    if(cnt>1){
    			//cout<<cnt<<endl;
    			ans=ans-((cnt*(cnt-1))/2);
    		}
    cout<<ans<<endl;
    
    return 0;
}

Submission Info

Judge Result