Submission #967690

#	Time	Username	Problem	Language	Result	Execution time	Memory
967690		jadai007	Vudu (COCI15_vudu)	C++14	126 / 140	265 ms	48312 KiB

vudu

#include<bits/stdc++.h>
#define int long long

using namespace std;

int n,k,arr[1000010], ans, qs[1000010], fw[2001000];
vector<int> vc;

void update(int idx, int val){
    for(int i = idx; i<=1e6; i+=(i&-i)) fw[i]+=val;
}

int query(int idx){
    int sum = 0;
    for(int i = idx; i>0; i-=(i&-i)) sum+=fw[i];
    return sum;
}

signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n;
    for(int i = 1; i<=n; ++i) cin >> arr[i];
    for(int i = 1; i<=n; ++i) qs[i] = qs[i - 1] + arr[i];
    cin >> k;
    for(int i = 0; i<=n; ++i) vc.push_back(qs[i] - k*i);
    sort(vc.begin(), vc.end());
    vc.erase(unique(vc.begin(), vc.end()));
    for(int i = 0; i<=n; ++i){
        int idx = lower_bound(vc.begin(), vc.end(), qs[i] - k*i) - vc.begin();
        ans+=query(idx+1);
        update(idx+1, 1);
    }
    cout << ans;
}

• Subtask 1: 126 / 140