#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define X first #define Y second #define pb push_back #define rep(X,Y) for (int (X) = 0;(X) < (int)(Y);++(X)) #define reps(X,S,Y) for (int (X) = (int)(S);(X) < (int)(Y);++(X)) #define rrep(X,Y) for (int (X) = (int)(Y)-1;(X) >=0;--(X)) #define rreps(X,S,Y) for (int (X) = (int)(Y)-1;(X) >= (int)(S);--(X)) #define repe(X,Y) for ((X) = 0;(X) < (Y);++(X)) #define peat(X,Y) for (;(X) < (Y);++(X)) #define all(X) (X).begin(),(X).end() #define rall(X) (X).rbegin(),(X).rend() #define eb emplace_back #define UNIQUE(X) (X).erase(unique(all(X)),(X).end()) #define Endl endl #define NL <<"\n" #define cauto const auto using namespace std; using ll=long long; using pii=pair; using pll=pair; template using vv=vector>; template inline bool MX(T &l,const T &r){return l inline bool MN(T &l,const T &r){return l>r?l=r,1:0;} //#undef NUIP #ifdef NUIP #include "benri.h" #else #define out(args...) #endif #ifdef __cpp_init_captures templatevector table(int n, T v){ return vector(n, v);} template auto table(int n, Args... args){auto val = table(args...); return vector(n, move(val));} #endif template pair operator+(const pair &p,const pair &q){ return {p.X+q.X,p.Y+q.Y};} template pair& operator+=(pair &p,const pair &q){ p.X+=q.X; p.Y+=q.Y; return p;} template pair operator-(const pair &p,const pair &q){ return {p.X-q.X,p.Y-q.Y};} template pair& operator-=(pair &p,const pair &q){ p.X-=q.X; p.Y-=q.Y; return p;} template istream& operator>>(istream &is, pair &p){ is>>p.X>>p.Y; return is;} template T read(){ T re; cin>>re; return move(re);} template T read(const T &dec){ T re; cin>>re; return re-dec;} template vector readV(const int sz){ vector re(sz); for(auto &x:re) x=read(); return move(re);} template vector readV(const int sz, const T &dec){ vector re(sz); for(auto &x:re) x=read(dec); return move(re);} vv readG(const int &n,const int &m){ vv g(n); rep(_,m){ cauto a=read(1),b=read(1); g[a].pb(b); g[b].pb(a);} return move(g);} vv readG(const int &n){ return readG(n,n-1);} const ll MOD=1e9+7; //998244353 const int nn=212345; ll bit[nn+1]; ll cnt[nn+1]; pll sum(int i){ ++i; pll s(0,0); while(i>0){ s.X+=bit[i]; s.Y+=cnt[i]; i-=i&-i; } return s; } void add(int i,ll x){ ++i; while(i<=nn){ bit[i]+=x; ++cnt[i]; i+=i&-i; } } int main(){ ios_base::sync_with_stdio(false); cin.tie(0); cout< ind(n); iota(all(ind),0); sort(all(ind),[&](cauto &i,cauto &j){ return vs[i] sums(n+1); rep(i,n) sums[i+1]=sums[i]+vs[i]; ll re=0; for(cauto &i:ind){ cauto L=sum(i); cauto R=sum(n)-L; int lc=i-L.Y, rc=R.Y; ll ls=sums[i]-L.X, rs=R.X; out(i,lc,rc,ls,rs,1); re+=ls*rc; re+=rs*lc; re+=vs[i]*lc*rc; re%=MOD; add(i,vs[i]); } if(0)rep(i,n){ int lc=0,rc=0; ll ls=0,rs=0; rep(j,i)if(vs[j]>vs[i]) ++lc, ls+=vs[j]; reps(j,i+1,n)if(vs[i]>vs[j]) ++rc, rs+=vs[j]; out(i,lc,rc,ls,rs,1); } cout<