Language: C++

#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define rrng(a) a.rbegin(),a.rend()
#define uni(x) x.erase(unique(rng(x)),x.end())
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define dup(x,y) (((x)+(y)-1)/(y))
#define v(T) vector<T>
#define vv(T) v(v(T))
#define diup(v,a,k) distance((v).begin(),(k)+upper_bound((v).begin(),(v).end(),(a)))
#define dilo(v,a,k) distance((v).begin(),(k)+lower_bound((v).begin(),(v).end(),(a)))
using ll = int64_t;
using ull = uint64_t;
using uint = uint32_t;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pil = pair<int,ll>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
template<typename T>inline istream& operator>>(istream&i,v(T)&v)
{rep(j,v.size())i>>v[j];return i;}
template<typename T>string join(const v(T)&v)
{stringstream s;rep(i,v.size())s<<' '<<v[i];return s.str().substr(1);}
template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v)
{if(v.size())o<<join(v);return o;}
template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v)
{return i>>v.fi>>v.se;}
template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v)
{return o<<v.fi<<","<<v.se;}
const double eps = 1e-6;
const ll LINF = 100200300400500600ll;
const int INF = 1001001001;
#define MOD 1000000007
//---------------------------------------------------------------
#define fastio cin.tie(nullptr); std::ios::sync_with_stdio(false);
#define myio ifstream iofi; if(argc>1){iofi.open(argv[1]); std::cin.rdbuf(iofi.rdbuf());}
#define myloopset int loop = 1; if(argc>2) loop =stoi(argv[2]); rep(i,loop)
//--------------------------------------------------------------
template <class T> T chmin(T &a,T b){if(a>b){a=b; return 1;}else return 0;}
template <class T> T chmax(T &a,T b){if(a<b){a=b; return 1;}else return 0;}

ll share_case(ll left1, ll right1,ll left2,ll right2){
  return max(0ll, min(right1,right2) - max(left1,left2));
}

void Main(){
  int n;
  cin>>n;
  ll k;
  cin>>k;
  vl a(n);
  cin>>a;
  vl inv(n,0);
  vl d(n,0);
  rep(i,n){
    rep(j,n){
      if(a[i]>a[j]){
        d[i]++;
        if(j>i) inv[i]++;
      }
    }
  }
  ll ans=0;
  rep(i,n){
    ll b = k*inv[i] ;
    if(b>MOD) b%=MOD; 
    ll bk = (d[i] * k*(k-1)/2);
    if(bk>MOD) bk%=MOD; 
    ll bkk = b+bk;
    if(bkk>MOD) bkk%=MOD; 
    ans += bkk; 
    if(ans>MOD) ans%=MOD; 
  }
  cout<<ans<<endl;
} int main(int argc,char** argv)
{fastio; myio; myloopset Main();}


Compiler output:
a.cc: In function 'll share_case(ll, ll, ll, ll)':
a.cc:51:13: error: no matching function for call to 'max(long long int, long int)'
   51 |   return max(0ll, min(right1,right2) - max(left1,left2));
      |          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:51:13: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long int')
   51 |   return max(0ll, min(right1,right2) - max(left1,left2));
      |          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:51:13: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   51 |   return max(0ll, min(right1,right2) - max(left1,left2));
      |          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~