# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
952810 | sondos225 | Vudu (COCI15_vudu) | C++17 | 239 ms | 33424 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template<typename T>using ordered_set = tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;//find_by_order(ind);
//order_of_key()
#define int long long
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define yes "YES"
#define no "NO"
#define bigg INT_MAX
#define debug(x) cout<<(#x)<<" = " <<x<<endl;
#define all(x) x.begin(),x.end()
#define sz size()
#define nn '\n'
#define mms(x,y) memset(x,y,sizeof(x))
#define forr(i,j,n) for (int i=j; i<n; i++)
#define forn(i,j,n) for (int i=j; i>n; i--)
#define fi first
#define se second
#define la "LA"
#define cinn(x,y) for(int i=0; i<y; i++) cin>>x[i];
#define pii pair<int,int>
int n;
int bit[1000005];
void add(int i, int x) //a[i] += x
{
for(; i <= n ; i += (i & (-i)))
bit[i] += x ;
}
int get(int i) //return a[1] + a[2] + a[3] + ... + a[i]
{
int sum = 0 ;
for(; i > 0 ; i -= (i & (-i)))
sum += bit[i] ;
return sum ;
}
signed main()
{
// #ifndef LOCAL
// freopen("lifeguards.in","r",stdin);
// freopen("lifeguards.out","w", stdout);
// #endif
fast
//int n;
cin>>n;
pii a[n];
forr(i,0,n){ cin>>a[i].fi;
a[i].se=i+1;
}
int p;
cin>>p;
int ans=0;
forr(i,0,n) a[i].fi-=p;
int sm=0;
forr(i,0,n)
{
sm+=a[i].fi;
a[i].fi=sm;
}//cout<<no<<endl;
//a[n]={0,0};
sort(a,a+n);
// add(0,1);
forr(i,0,n)
{
// cout<<la<<a[i].fi<<' '<<a[i].se<<endl;
int x=a[i].se;
ans+=get(x);add(x,1);//cout<<x<<' '<<get(x)<<endl;
if (a[i].fi>=0) ans++;
}
cout<<ans;
// int sm[n];
// sm[0]=a[0];
//int b[n];
// //b[0]=sm[0];
// //vector<int> s;
// // multiset<int> s;
// // s.pb(0);
// s.insert(a[0]-p);
// s.insert(0);
// int ans=0;
// // cout<<la<<0<<' '<<sm[0]<<endl;
// forr(i,1,n)
// {
//
// sm[i]=sm[i-1]+a[i];//cout<<la<<i<<' '<<sm[i]<<endl;
// int x=sm[i]-(p*(i+1));
//
// // sort(all(s));
// //cout<<no<<x<<endl;
// // for(auto y:s) cout<<la<<y<<endl;
// //cout<<x<<endl;
// auto k=s.lower_bound(x+1);
// int w=distance( s.begin(), k );
// // s.order_of_key(x+1);
// //w--;
// // cout<<w<<endl;
// s.insert(x);
// // (lower_bound(all(s),x+1)-s.begin());
// //w--;
// // int d=
// // if (w==s.sz) w=0;
// // w++;
//
// // cout<<w<<endl;
// ans+=max(0ll,w);
//
//
// // b[i]=;
// }
// cout<<la<<endl;
// for(auto y:s) cout<<y<<' ';
// cout<<ans;
return 0;
}
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