Submission #240974

#TimeUsernameProblemLanguageResultExecution timeMemory
240974AmineWeslatiMountains (NOI20_mountains)C++14
77 / 100
118 ms14548 KiB
//Never stop trying #pragma GCC optimize("O3") #include <bits/stdc++.h> #include<ext/pb_ds/assoc_container.hpp> #include<ext/pb_ds/tree_policy.hpp> using namespace __gnu_pbds; using namespace std; template <typename T> using ordered_set=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; //s.order_of_key(), *s.find_by_order() using namespace std; #define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0) typedef string str; typedef long long ll; #define int ll typedef double db; typedef long double ld; typedef pair<int,int> pi; #define fi first #define se second typedef vector<int> vi; typedef vector<ld> vd; typedef vector<str> vs; typedef vector<pi> vpi; #define pb push_back #define eb emplace_back #define pf push_front #define lb lower_bound #define ub upper_bound #define sz(x) (int)x.size() #define all(x) begin(x), end(x) #define rall(x) rbegin(x), rend(x) #define endl "\n" const int MOD = 1e9+7; //998244353 const ll INF = 1e18; const int nx[4]={0,0,1,-1}, ny[4]={1,-1,0,0}; //right left down up const int MX=3e5+10; int N; int t[MX]; int bit[MX]; int lsb(int i){return i&-i;} void update(int idx){ while(idx<MX){ bit[idx]++; idx+=lsb(idx); } } int getSum(int idx){ int ans=0; while(idx>0){ ans+=bit[idx]; idx-=lsb(idx); } return ans; } int32_t main(){ boost; memset(bit,0,MX); cin>>N; int r[N],l[N]; vpi vec; for(int i=0; i<N; i++){ cin>>t[i]; vec.pb({t[i],i}); }sort(all(vec)); int nb=0; for(int i=0; i<N; i++){ if(i==0||vec[i-1].fi<vec[i].fi) nb++; t[vec[i].se]=nb; } for(int i=0; i<N; i++){ l[i]=getSum(t[i]); update(t[i]+1); } memset(bit,0,MX); for(int i=N-1; i>=0; i--){ r[i]=getSum(t[i]); update(t[i]+1); } int res=0; for(int i=0; i<N; i++) res+=r[i]*l[i]; cout << res << endl; return 0; }
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