Submission #1230452

#	Time	Username	Problem	Language	Result	Execution time	Memory
1230452		warrenn	Vudu (COCI15_vudu)	C++20	140 / 140	235 ms	39700 KiB

vudu

#include<bits/stdc++.h>
using namespace std;
#define int long long

const int maxn=1e6+2;
int n,p;
int a[maxn];
int b[maxn];
int pref[maxn];
int cnt=1;
vector<int>tmp;

vector<int>bit;
void update(int x,int val){
    for(int q=x;q<=n+2;q+=(q&-q)){
        bit[q]+=val;
    }
}
int get(int idx){
    int res=0;
    for(int u=idx;u>0;u-=(u&-u)){
        res+=bit[u];
    }
    return res;
}

int conv(int hah){
    int idx=lower_bound(tmp.begin(),tmp.end(),hah)-tmp.begin();
    return idx+1;
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n;    
    for(int q=1;q<=n;q++){
        cin>>a[q];
    }
    cin>>p;
    for(int q=1;q<=n;q++){
        pref[q]=pref[q-1]+a[q];
        b[q]=pref[q]-p*q;
        tmp.push_back(b[q]);
    }
    tmp.push_back(0);

    sort(tmp.begin(),tmp.end());
    tmp.erase(unique(tmp.begin(),tmp.end()),tmp.end());
    bit=vector<int>(n+3);
    int ans=0;
    update(conv(0),1);
   
    for(int q=1;q<=n;q++){
        ans+=get(conv(b[q]));
    //    cout<<ans<<" "<<conv[b[q]]<<endl;
        update(conv(b[q]),1);
    }
    cout<<ans<<endl;
}

• Subtask 1: 140 / 140