Submission #549944

#TimeUsernameProblemLanguageResultExecution timeMemory
549944BungmintZoltan (COCI16_zoltan)C++17
140 / 140
258 ms10340 KiB
//Copyright © 2022 Youngmin Park. All rights reserved.
//#pragma GCC optimize("O3")
//#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using vi = vector<int>;
using pii = pair<int, int>;
using vpi = vector<pii>;
using pll = pair<ll, ll>;
using vl = vector<ll>;
using vpl = vector<pll>;
using ld = long double;
template <typename T, size_t SZ>
using ar = array<T, SZ>;

#define all(v) (v).begin(), (v).end()
#define pb push_back
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i, a) ROF(i, 0, a)
#define REP(a) F0R(_, a)

const int INF = 1e9;
const ll LINF = 1e18;
const int MOD = 1e9 + 7; //998244353;
const ld PI = acos((ld)-1.0);
const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T>
using pqg = priority_queue<T, vector<T>, greater<T>>;
template <typename T>
bool ckmin(T &a, const T &b) { return b < a ? a = b, 1 : 0; }
template <typename T>
bool ckmax(T &a, const T &b) { return b > a ? a = b, 1 : 0; }

template <typename A, typename B>
ostream &operator<<(ostream &os, const pair<A, B> &p)
{
    return os << '(' << p.first << ", " << p.second << ')';
}
template <typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type>
ostream &operator<<(ostream &os, const T_container &v)
{
    os << '{';
    string sep;
    for (const T &x : v)
        os << sep << x, sep = ", ";
    return os << '}';
}
void dbg_out()
{
    cerr << endl;
}
template <typename Head, typename... Tail>
void dbg_out(Head H, Tail... T)
{
    cerr << ' ' << H;
    dbg_out(T...);
}
#ifdef LOCAL
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...) 42
#endif

inline namespace RecursiveLambda{
	template <typename Fun>
	struct y_combinator_result{
		Fun fun_;
		template <typename T> 
		explicit y_combinator_result(T &&fun): fun_(forward<T>(fun)){}
		template <typename...Args>
		decltype(auto) operator()(Args &&...args){
			return fun_(ref(*this), forward<Args>(args)...);
		}
	};
	template <typename Fun>
	decltype(auto) y_combinator(Fun &&fun){
		return y_combinator_result<decay_t<Fun>>(forward<Fun>(fun));
	}
};

void setIO(string s) // USACO
{
	#ifndef LOCAL
	    freopen((s + ".in").c_str(), "r", stdin);
	    freopen((s + ".out").c_str(), "w", stdout);
	#endif
}

/**
 * Description: modular arithmetic operations 
 * Source: 
	* KACTL
	* https://codeforces.com/blog/entry/63903
	* https://codeforces.com/contest/1261/submission/65632855 (tourist)
	* https://codeforces.com/contest/1264/submission/66344993 (ksun)
	* also see https://github.com/ecnerwala/cp-book/blob/master/src/modnum.hpp (ecnerwal)
 * Verification: 
	* https://open.kattis.com/problems/modulararithmetic
 */
template<int MOD, int RT> struct mint {
	static const int mod = MOD;
	static constexpr mint rt() { return RT; } // primitive root for FFT
	int v; explicit operator int() const { return v; } // explicit -> don't silently convert to int
	mint() { v = 0; }
	mint(ll _v) { v = int((-MOD < _v && _v < MOD) ? _v : _v % MOD);
		if (v < 0) v += MOD; }
	bool operator==(const mint& o) const{
		return v == o.v; }
	friend bool operator!=(const mint& a, const mint& b) { 
		return !(a == b); }
	friend bool operator<(const mint& a, const mint& b) { 
		return a.v < b.v; }
	friend istream& operator>>(istream& is, const mint& o){
		ll v; is >> v; o = mint(v); return is; }
	friend ostream& operator<<(ostream& os, const mint& o){
		os << o.v; return os; }
	
	mint& operator+=(const mint& m) { 
		if ((v += m.v) >= MOD) v -= MOD; 
		return *this; }
	mint& operator-=(const mint& m) { 
		if ((v -= m.v) < 0) v += MOD; 
		return *this; }
	mint& operator*=(const mint& m) { 
		v = int((ll)v*m.v%MOD); return *this; }
	mint& operator/=(const mint& m) { return (*this) *= inv(m); }
	friend mint pow(mint a, ll p) {
		mint ans = 1; assert(p >= 0);
		for (; p; p /= 2, a *= a) if (p&1) ans *= a;
		return ans; }
	friend mint inv(const mint& a) { assert(a.v != 0); 
		return pow(a,MOD-2); }
		
	mint operator-() const { return mint(-v); }
	mint& operator++() { return *this += 1; }
	mint& operator--() { return *this -= 1; }
	friend mint operator+(mint a, const mint& b) { return a += b; }
	friend mint operator-(mint a, const mint& b) { return a -= b; }
	friend mint operator*(mint a, const mint& b) { return a *= b; }
	friend mint operator/(mint a, const mint& b) { return a /= b; }
};

using Mint = mint<MOD,5>; // 5 is primitive root for both common mods

template<typename T, typename Merge = plus<T>>
struct SegTree{
	int sz;
	const Merge merge;
	vector<T> t;
	SegTree(int n) : merge(Merge()) {
		sz = 1;
		while (sz<n) sz*=2;
		t.resize(sz*2);
	}
	void build(vector<T> &vec, int x, int l, int r)
	{
	    if (r - l == 1)
	    {
	        if (l < (int)vec.size())
	            t[x] = vec[l];
	        return;
	    }
	    int mid = (l + r) / 2;
	    build(vec, 2 * x + 1, l, mid);
	    build(vec, 2 * x + 2, mid, r);
	    t[x] = merge(t[2 * x + 1], t[2 * x + 2]);
	}
	void build(vector<T> &vec)
	{
	    build(vec, 0, 0, sz);
	}
	void upd(int i, const T& v, int x, int l, int r)
	{
	    if (r - l == 1)
	    {
	        t[x] = merge(t[x], v);
	        return;
	    }
	    int mid = (l + r) / 2;
	    if (i < mid)
	        upd(i, v, 2 * x + 1, l, mid);
	    else
	        upd(i, v, 2 * x + 2, mid, r);
	    t[x] = merge(t[2 * x + 1], t[2 * x + 2]);
	}
	void upd(int i, const T& v)
	{
	    upd(i, v, 0, 0, sz);
	}
	T query(int l, int r, int x, int lx, int rx)
	{
	    if (lx >= r || rx <= l)
	        return T();
	    if (lx >= l && rx <= r)
	        return t[x];
	    int mid = (lx + rx) / 2;
	    T a = query(l, r, 2 * x + 1, lx, mid);
	    T b = query(l, r, 2 * x + 2, mid, rx);
	    return merge(a, b);
	}
	T query(int l, int r)
	{
	    return query(l, r, 0, 0, sz);
	}
};

struct Max {
	int len;
	Mint cnt;
	Max(int x = 0, Mint c = 1) : len(x), cnt(c) {}
	Max operator+(const Max& other) const {
		if (other.len == 0) return *this;
		if (len == 0) return other;
		if (other.len > len) return other;
		if (len > other.len) return *this;
		return {len, cnt + other.cnt};
	}
};


void solve()
{
	int n;
	cin >> n;
	vi a(n), tmp;
	for (int &e : a) cin >> e, tmp.pb(e);
	sort(all(tmp));
	tmp.resize(unique(all(tmp)) - tmp.begin());
	for (auto &e : a) e = lb(all(tmp), e) - tmp.begin();
	Mint ans = 0;
	int mx = 0;
	SegTree<Max> smax(sz(tmp)), smin(sz(tmp));
	R0F(i, n) {
		auto &e = a[i];
		Max z = smax.query(e + 1, sz(tmp)), w = smin.query(0, e);
		int len = z.len + w.len + 1;
		if (ckmax(mx, len)) {
			ans = z.cnt * w.cnt;
		}else if (mx == len) ans += z.cnt * w.cnt;
		z.len++;
		w.len++;
		dbg(i, e, w.len, z.len);
		smax.upd(e, z);
		smin.upd(e, w);
	}
	cout << mx << ' ' << ans * pow(Mint(2), n - mx) << '\n';
}

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);
    int testcase=1;
    // cin >> testcase;
    while (testcase--)
    {
        solve();
    }
}

Compilation message (stderr)

zoltan.cpp: In function 'void solve()':
zoltan.cpp:71:18: warning: statement has no effect [-Wunused-value]
   71 | #define dbg(...) 42
      |                  ^~
zoltan.cpp:252:3: note: in expansion of macro 'dbg'
  252 |   dbg(i, e, w.len, z.len);
      |   ^~~
zoltan.cpp: In function 'void setIO(std::string)':
zoltan.cpp:94:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |      freopen((s + ".in").c_str(), "r", stdin);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
zoltan.cpp:95:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |      freopen((s + ".out").c_str(), "w", stdout);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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