제출 #94545

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
94545		theknife2001	Vudu (COCI15_vudu)	C++17	140 / 140	334 ms	45356 KiB

vudu

#include <bits/stdc++.h>
#define ll long long
#define mid (l+r)/2
#define ii pair < ll , int >
#define se second
#define fi first


using namespace std;
const int N=1e6+55;
vector < ii > vec;
int tree[N];
ll sum[N];
ll a[N];
int n;

bool cmp (ii A, ii B) {
  if (A.first != B.first) return A.first < B.first;
  return A.second > B.second;
}

int query(int x)
{
    if(x<=0)
        return 0;
    return query(x-(x&(-x)))+tree[x];
}

void update(int x)
{
    if(x>n)
        return ;
    tree[x]++;
    update(x+(x&(-x)));
}

int main()
{
    ios::sync_with_stdio(false);
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>a[i];
    int p;
    cin>>p;
    for(int i=n-1;i>=0;i--)
    {
        sum[i]=a[i]-p;
        if(i!=n-1)
            sum[i]+=sum[i+1];
        a[i]=sum[i];
    }
    for(int i=0;i<n;i++)
    {
        vec.push_back({a[i],i+1});
    }
    sort(vec.begin(),vec.end(),cmp);
    int cnt=1;
    ll ans=0;
    for(int i=0;i<n;i++)
    {
//        cout<<vec[i].fi<<' '<<vec[i].se<<endl;
        if(vec[i].fi>=0)
            ans++;
        ans+=(i)-query(vec[i].se);
//        cout<<ans<<endl;
        update(vec[i].se);
    }
    cout<<ans<<endl;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

vudu.cpp: In function 'int main()':
vudu.cpp:57:9: warning: unused variable 'cnt' [-Wunused-variable]
     int cnt=1;
         ^~~

• Subtask 1: 140 / 140