Submission #968663

#	Time	Username	Problem	Language	Result	Execution time	Memory
968663		RandomUser	Vudu (COCI15_vudu)	C++17	140 / 140	482 ms	19836 KiB

vudu

#include <bits/stdc++.h>
#define all(x) x.begin(), x.end()
using namespace std;
using ll = long long;
 
struct BIT {
    int n;
    vector<int> tree;
 
    void config(int _n) {
        n = _n + 5;
        tree.resize(_n+10);
    }
 
    void update(int p, int v) {
        for(p++; p<n; p+=p&-p) tree[p] += v;
    }
 
    int query(int p) {
        int ans = 0;
        for(p++; p>0; p-=p&-p) ans += tree[p];
        return ans;
    }
};
 
 
int main() {
    int n, p, i;
    cin >> n;
 
    ll v[n+1], ans = 0; v[0] = 0;
    for(i=1; i<=n; i++) cin >> v[i];
 
    cin >> p;
    ll sum = 0;
    for(i=0; i<=n; i++) {
        sum += v[i];
        v[i] = sum - (ll)i * p;
    }
 
    vector<ll> comp;
    for(int i=0; i<=n; i++) comp.push_back(v[i]);
    sort(comp.begin(), comp.end());
    comp.erase(unique(comp.begin(), comp.end()), comp.end());
 
    int P;
    BIT bit; bit.config(n);
    for(i=0; i<=n; i++) {
        P = lower_bound(comp.begin(), comp.end(), v[i]) - comp.begin();
        ans += bit.query(P);
        bit.update(P, 1);
    }
 
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 140 / 140