Submission #380263

#	Time	Username	Problem	Language	Result	Execution time	Memory
380263		vishesh312	Vudu (COCI15_vudu)	C++17	42 / 140	1099 ms	51180 KiB

vudu

#pragma GCC optimize("unroll-loops", "Ofast")

#include "bits/stdc++.h"
using namespace std;

using ll = long long;

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using ordered_set = tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>;

#define all(x) begin(x), end(x)
#define sz(x) (int)x.size()

const int mod = 1e9+7;

struct SegTree {
    vector<ll> t;
    int n;
    SegTree (int _n) {
        n = _n;
        t.resize(4*n+1);
    }
    void update(int v, int tl, int tr, int val) {
        if (tl == tr) {
            t[v]++;
        } else {
            int tm = (tl + tr) / 2;
            if (val <= tm) {
                update(v*2, tl, tm, val);
            } else {
                update(v*2+1, tm+1, tr, val);
            }
            t[v] = t[v*2] + t[v*2+1];
        }
    }
    ll query(int v, int tl, int tr, int l, int r) {
        if (r < l) return 0;
        if (tl == tr) {
            return t[v];
        }
        int tm = (tl + tr) / 2;
        return query(v*2, tl, tm, l, min(tm, r)) + query(v*2+1, tm+1, tr, max(tm+1, l), r);
    }
    void update(int val) {update(1, 0, n, val);}
    ll query(int x) {return query(1, 0, n, 0, x);}
};

void solve(int tc) {
    int n;
    cin >> n;
    pair<ll, int> v[n+1];
    v[0] = {0, 0};
    for (int i = 1; i <= n; ++i) {
        cin >> v[i].first;
        v[i].second = i;
    }
    int a[n+1];
    ll p;
    cin >> p;
    for (int i = 1; i <= n; ++i) {
        v[i].first += v[i-1].first - p;
    }
    sort(v, v+n+1);
    ll cur = 0;
    for (int i = 0; i <= n; ++i) {
        if (i) if (v[i].first == v[i-1].first) --cur;
        a[v[i].second] = cur;
        ++cur;
    }
    SegTree seg(n+1);
    ll ans = 0;
    seg.update(a[0]);
    for (int i = 1; i <= n; ++i) {
        ans += seg.query(a[i]);
        seg.update(a[i]);
    }
    cout << ans << '\n';
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int tc = 1;
    //cin >> tc;
    for (int i = 1; i <= tc; ++i) solve(i);
    return 0;
}

• Subtask 1: 42 / 140