Submission #246475

#	Time	Username	Problem	Language	Result	Execution time	Memory
246475		bibabas	Vudu (COCI15_vudu)	C++14	140 / 140	829 ms	57976 KiB

vudu

#include <bits/stdc++.h>
 
#define ll long long
#define ull unsigned ll
#define vi vector<ll>
#define vvi vector<vi>
#define all(x) x.begin(), x.end()
#define pb push_back
#define mp make_pair
#define ld long double
#define pii pair<ll, ll>
#define mt make_tuple
#define mn(a, b) a = min(a, b)
#define mx(a, b) a = max(a, b)
 
using namespace std;
 
const ll INF = (ll)2e9;
const ll inf = (ll)2e18;
const ld eps = (ld)1e-8;
const ll mod = (ll)10007;
const ll MAXN = (ll)1e4 + 1;
const ll MAXC = (ll)1e6 + 1;
const ll MAXE = (ll)1000;
const ll MAXLOG = 21;
const ll maxlen = (ll)1e5;
const ll asci = (ll)256;
const ll block = 480;
const ld PI = acos(-1);
const ld e = 2.7182818284;
 
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<
pii,
null_type,
less<pii>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;*/
 
template <class T>
istream& operator >>(istream &in, vector<T> &arr){
    for (T &cnt : arr) {
        in >> cnt;
    }
    return in;
};

struct stree{
    vi t;

    stree (ll n) {
        t.resize(4 * n);
    }

    void upd(ll v, ll tl, ll tr, ll pos) {
        if (tl + 1 == tr) return void(t[v]++);
        ll tm = (tl + tr) / 2;
        if (pos < tm) upd(2 * v, tl, tm, pos);
        else upd(2 * v + 1, tm, tr, pos);
        t[v]++;
    }

    ll ask(ll v, ll tl, ll tr, ll l, ll r) {
        if (l <= tl && tr <= r) return t[v];
        if (tl >= r || l >= tr) return 0;
        ll tm = (tl + tr) / 2;
        return ask(2 * v, tl, tm, l, r) + ask(2 * v + 1, tm, tr, l, r);
    }
};

void solve() {
    ll n; cin >> n;
    vi a(n); cin >> a;
    ll p; cin >> p;
    vi pref(n + 1);
    for (ll i = 0; i < n; ++i) pref[i + 1] = pref[i] + a[i] - p;
    vi vals = pref;
    sort(all(vals));
    vals.resize(unique(all(vals)) - vals.begin());
    stree t(vals.size());
    ll ans = 0;
    for (ll i = 0; i <= n; ++i) {
        ans += t.ask(1, 0, vals.size(), 0, upper_bound(all(vals), pref[i]) - vals.begin());
        t.upd(1, 0, vals.size(), lower_bound(all(vals), pref[i]) - vals.begin());
    }
    cout << ans;
}

signed main() {
    srand(time(0));
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
#endif
    cout.precision(30);
    
    solve();
 
    return 0;
}

• Subtask 1: 140 / 140