459B Pashmak and Flowers

这道题给我wa惨了，数组元素范围分明是10^9，int完全够啊，今天改成long long 过了，求解释啊

#include<iostream>
#include<stdio.h>
#include<algorithm>
#define N 200005
using namespace std;
int main(){
    long long n,a[N];
    while(cin>>n){
        for(long long i=0;i<n;i++)
            cin>>a[i];
        sort(a,a+n);
        long long lena=1,lenb=1;
        for(long long i=1;i<n;i++)
            if(a[0]==a[i]) lena++;
        for(long long i=n-2;i>=0;i--)
            if(a[n-1]==a[i]) lenb++;
        if(lena==n){
            long long t=0;
            cout<<t<<" "<<n*(n-1)/2<<endl;
        }
        else{
            cout<<a[n-1]-a[0]<<" "<<lenb*lena<<endl;
        }
    }
}

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