Submission #1084207

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084207		ilovveyyou	Baloni (COCI15_baloni)	C++14	100 / 100	438 ms	35152 KiB

baloni

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long
#define mp(x, y) make_pair(x, y)
#define sz(v) ((int) (v).size())
#define all(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define BIT(x, y) (((x) >> (y)) & 1)
#define pb push_back
#define max_rng *max_element
#define min_rng *min_element
#define rep(i, n) for(int i = 1, _n = (n); i <= _n; ++i)
#define forn(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i)
#define ford(i, a, b) for(int i = (a), _b = (b); i >= _b; --i)

template <class X, class Y>
    inline bool maximize(X &x, Y y) {
        return (x < y ? x = y, true : false);
    }

template <class X, class Y>
    inline bool minimize(X &x, Y y) {
        return (x > y ? x = y, true : false);
    }

template <class X>
    inline void compress(vector<X> &a) {
        sort(all(a));
        a.resize(unique(all(a)) - a.begin());
    }

int ctz(ll x) { return __builtin_ctzll(x); }
int lg(ll x) { return 63 - __builtin_clzll(x); }
int popcount(ll x) { return __builtin_popcount(x); }

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) {
    return l + abs((ll) rng()) % (r - l + 1);
}

const ll oo = (ll) 1e17;
const int inf = (ll) 1e9, mod = (ll) 1e9 + 7;

const int mxn = 1e6, mxm = 3e6;
const int LG = 17;

int n;
int a[mxn + 5];

struct Seg {
    int n;
    vector<pair<int, int>> st;
    Seg(int n) : n(n) {
        st.resize(n << 2);
        build(1, 1, n);
    }
    void build(int i, int l, int r) {
        if (l == r) {
            st[i] = mp(a[l], l);
            return;
        }
        int m = (l + r) >> 1;
        build(2 * i, l, m);
        build(2 * i + 1, m + 1, r);

        st[i] = max(st[2 * i], st[2 * i + 1]);
    }

    void shutdown(int p) {
        int i = 1;
        for (int l = 1, r = n; l < r; ) {
            int m = (l + r) >> 1;
            if (p > m) {
                l = m + 1;
                i = 2 * i + 1;
            }
            else {
                r = m;
                i = 2 * i;
            }
        }
        st[i] = mp(-inf, 0);
        while (i > 1) {
            i >>= 1;
            st[i] = max(st[2 * i], st[2 * i + 1]);
        }
    }

    pair<int, int> get(int i, int l, int r, int u, int v) {
        if (l > v || r < u) return mp(-inf, 0);
        if (l >= u && r <= v) return st[i];
        int m = (l + r) >> 1;
        pair<int, int> L = get(2 * i, l, m, u, v);
        pair<int, int> R = get(2 * i + 1, m + 1, r, u, v);
        return max(L, R);
    }

    pair<int, int> get(int u, int v) {
        return get(1, 1, n, u, v);
    }
};

int main(void) {

    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    cin >> n;
    rep(i, n) cin >> a[i];

    Seg s(n);

    int cnt = 0;
    pair<int, int> start;
    while ((start = s.get(1, n)) != mp(-inf, 0)) {
        cnt++;
        while (true) {
            s.shutdown(start.se);
            pair<int, int> nxt = s.get(start.se + 1, n);
            if (start.fi - 1 != nxt.fi) break;
            else start = nxt;
        }
    }

    cout << cnt;

    return 0;
}

• Subtask 1: 100 / 100