#include using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- int N; int A[505050]; template class BIT { public: V bit[1< bt; void solve() { int i,j,k,l,r,x,y; string s; cin>>N; vector V; V.push_back(-1); FOR(i,N) cin>>A[i],V.push_back(A[i]); sort(ALL(V)); V.erase(unique(ALL(V)),V.end()); ll ret=0; FOR(i,N) { A[i]=lower_bound(ALL(V),A[i])-V.begin(); ret+=bt(A[i]-1); bt.add(A[i],1); } cout<