oj.uz

답안 #583336

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
583336 2022-06-25T08:50:48 Z Drew_ 말 (IOI15_horses) C++17
100 / 100
 323 ms 56912 KB 
#include "horses.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back

using ll = long long;

const int MAX = 5e5 + 69;
const ll inf = 1e9 + 5;
const int mod = 1e9 + 7;

template<int MOD = mod>
struct Mint
{
    int val;

    Mint() : val(0) {}
    Mint(int64_t _val) : val((int)(_val % MOD)) { if (val < 0) val += MOD; }

    Mint& operator+= (const Mint &rhs) { val += rhs.val; if (val >= MOD) val -= MOD; return *this; }
    Mint& operator-= (const Mint &rhs) { val -= rhs.val; if (val < 0) val += MOD; return *this; }
    Mint& operator*= (const Mint &rhs) { val = (int)(1ll * val * rhs.val % MOD); return *this; }

    friend Mint fpow(Mint x, int64_t y)
    {
        Mint res = 1;
        for (; y > 0; y >>= 1, x *= x)
        {
            if (y & 1)
                res *= x;
        }
        return res;
    }
    friend Mint inverse(Mint x) { return fpow(x, MOD-2); }
    Mint& operator/= (const Mint &rhs) { return *this *= inverse(rhs); }

    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) { return 0 - a; }
    friend Mint operator* (Mint a, const Mint &b) { return a *= b; }
    friend Mint operator/ (Mint a, const Mint &b) { return a /= b; }
    friend ostream& operator<< (ostream &os, const Mint &a) { return os << a.val; }
    friend bool operator== (const Mint &a, const Mint &b) { return a.val == b.val; }
    friend bool operator!= (const Mint &a, const Mint &b) { return a.val != b.val; }
};

struct Segtree1
{
	int n;
	Mint<> st[2 * MAX];

	Segtree1() {}
	Segtree1(int n_, int ar[]) : n(n_)
	{
		for (int i = 0; i < n; ++i)
			st[i+n] = ar[i];
		for (int i = n-1; i >= 0; --i)
			st[i] = st[i << 1] * st[i << 1 | 1];
	}

	inline void modify(int p, int val)
	{
		for (st[p += n] = val; p > 1; p >>= 1)
			st[p >> 1] = st[p] * st[p^1];
	}

	inline Mint<> query(int l, int r)
	{
		Mint<> res = 1;
		for (l += n, r += n+1; l < r; l >>= 1, r >>= 1)
		{
			if (l & 1) res *= st[l++];
			if (r & 1) res *= st[--r];
		}
		return res;
	}
} st1;

struct Segtree2
{
	int n;
	int st[2 * MAX];

	Segtree2() {}
	Segtree2(int n_, int ar[]) : n(n_)
	{
		for (int i = 0; i < n; ++i)
			st[i+n] = ar[i];
		for (int i = n-1; i >= 0; --i)
			st[i] = max(st[i << 1], st[i << 1 | 1]);
	}

	inline void modify(int p, int val)
	{
		for (st[p += n] = val; p > 1; p >>= 1)
			st[p >> 1] = max(st[p], st[p^1]);
	}

	inline int query(int l, int r)
	{
		int res = 0;
		for (l += n, r += n+1; l < r; l >>= 1, r >>= 1)
		{
			if (l & 1) res = max(res, st[l++]);
			if (r & 1) res = max(res, st[--r]);
		}
		return res;
	}
} st2;


int N, X[MAX], Y[MAX];
set<int, greater<int>> non_one; // position of non-one numbers

int calc()
{
	vector<int> idx = { N };
	{
		ll val = 1;
		for (int x : non_one)
		{
			idx.pb(x);
			val *= X[x];

			if (val > inf)
				break;
		}

		if (val <= inf && idx.back() != 0)
			idx.pb(0);
	}
	reverse(idx.begin(), idx.end());

	ll mx = 0; int best = 0, ybest = 0;
	for (int i = 0; i+1 < (int)idx.size(); ++i)
	{
		int ymax = st2.query(idx[i], idx[i+1] - 1);
		ll xval = st1.query(idx[1], idx[i]).val;
			
		// cerr << idx[i] << " " << idx[i+1] << " " << xval << " " << ymax << '\n';

		if (ymax * xval > mx)
			mx = ymax * xval, best = i, ybest = ymax;
	}
	// cerr << "best: " << best << '\n';
	// cerr << '\n';

	return (st1.query(0, idx[best]) * ybest).val;
}

int init(int n, int x[], int y[])
{
	N = n;
	for (int i = 0; i < N; ++i)
		X[i] = x[i], Y[i] = y[i];

	st1 = Segtree1(n, x);
	st2 = Segtree2(n, y);

	for (int i = 0; i < N; ++i) if (x[i] != 1)
		non_one.insert(i);

	return calc();
}

int updateX(int pos, int val) 
{
	X[pos] = val;
	st1.modify(pos, val);
	if (val == 1) non_one.erase(pos);
	else non_one.insert(pos);

	return calc();
}

int updateY(int pos, int val) 
{
	Y[pos] = val;
	st2.modify(pos, val);	
	return calc();
}

Subtask #1
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 11988 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 8 ms 11988 KB Output is correct
4 Correct 8 ms 11968 KB Output is correct
5 Correct 7 ms 11988 KB Output is correct
6 Correct 7 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 5 ms 11988 KB Output is correct
11 Correct 6 ms 12060 KB Output is correct
12 Correct 6 ms 11988 KB Output is correct
13 Correct 6 ms 12116 KB Output is correct
14 Correct 6 ms 11988 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 9 ms 12000 KB Output is correct
18 Correct 6 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 8 ms 11952 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 8 ms 11988 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 7 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11996 KB Output is correct
11 Correct 6 ms 12024 KB Output is correct
12 Correct 6 ms 11988 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11988 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 11988 KB Output is correct
17 Correct 7 ms 11988 KB Output is correct
18 Correct 6 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 6 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct
22 Correct 6 ms 11988 KB Output is correct
23 Correct 7 ms 11976 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 12116 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 8 ms 12080 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 8 ms 11988 KB Output is correct
30 Correct 7 ms 12072 KB Output is correct
31 Correct 8 ms 11988 KB Output is correct
32 Correct 8 ms 12052 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 228 ms 46008 KB Output is correct
2 Correct 289 ms 56852 KB Output is correct
3 Correct 230 ms 48060 KB Output is correct
4 Correct 314 ms 51868 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 6 ms 11988 KB Output is correct
3 Correct 6 ms 12056 KB Output is correct
4 Correct 7 ms 11988 KB Output is correct
5 Correct 7 ms 11956 KB Output is correct
6 Correct 7 ms 12012 KB Output is correct
7 Correct 8 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 8 ms 11988 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 6 ms 11988 KB Output is correct
13 Correct 6 ms 11940 KB Output is correct
14 Correct 7 ms 11988 KB Output is correct
15 Correct 6 ms 11944 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 6 ms 11988 KB Output is correct
18 Correct 6 ms 11936 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 7 ms 11988 KB Output is correct
21 Correct 7 ms 11988 KB Output is correct
22 Correct 8 ms 11956 KB Output is correct
23 Correct 7 ms 12088 KB Output is correct
24 Correct 8 ms 12032 KB Output is correct
25 Correct 7 ms 12016 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 10 ms 12020 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 7 ms 11988 KB Output is correct
30 Correct 7 ms 12116 KB Output is correct
31 Correct 7 ms 11988 KB Output is correct
32 Correct 7 ms 12004 KB Output is correct
33 Correct 41 ms 20084 KB Output is correct
34 Correct 41 ms 24004 KB Output is correct
35 Correct 181 ms 54284 KB Output is correct
36 Correct 176 ms 54248 KB Output is correct
37 Correct 51 ms 22108 KB Output is correct
38 Correct 94 ms 34960 KB Output is correct
39 Correct 31 ms 21892 KB Output is correct
40 Correct 156 ms 49344 KB Output is correct
41 Correct 33 ms 21972 KB Output is correct
42 Correct 42 ms 21988 KB Output is correct
43 Correct 147 ms 49848 KB Output is correct
44 Correct 154 ms 49816 KB Output is correct

Subtask #5
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 6 ms 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 7 ms 12024 KB Output is correct
6 Correct 8 ms 11992 KB Output is correct
7 Correct 7 ms 11988 KB Output is correct
8 Correct 7 ms 11988 KB Output is correct
9 Correct 8 ms 11988 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 6 ms 12028 KB Output is correct
12 Correct 7 ms 11984 KB Output is correct
13 Correct 7 ms 11988 KB Output is correct
14 Correct 6 ms 11988 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 6 ms 11936 KB Output is correct
18 Correct 6 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 6 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct
22 Correct 5 ms 11988 KB Output is correct
23 Correct 7 ms 11988 KB Output is correct
24 Correct 7 ms 12096 KB Output is correct
25 Correct 7 ms 12116 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 8 ms 11988 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 7 ms 12008 KB Output is correct
30 Correct 6 ms 12116 KB Output is correct
31 Correct 7 ms 11988 KB Output is correct
32 Correct 7 ms 12072 KB Output is correct
33 Correct 235 ms 45892 KB Output is correct
34 Correct 323 ms 56912 KB Output is correct
35 Correct 239 ms 48132 KB Output is correct
36 Correct 301 ms 51964 KB Output is correct
37 Correct 37 ms 23904 KB Output is correct
38 Correct 39 ms 24020 KB Output is correct
39 Correct 188 ms 54324 KB Output is correct
40 Correct 177 ms 54196 KB Output is correct
41 Correct 55 ms 22168 KB Output is correct
42 Correct 86 ms 34948 KB Output is correct
43 Correct 29 ms 21880 KB Output is correct
44 Correct 165 ms 49380 KB Output is correct
45 Correct 33 ms 21976 KB Output is correct
46 Correct 37 ms 22024 KB Output is correct
47 Correct 153 ms 49680 KB Output is correct
48 Correct 149 ms 49796 KB Output is correct
49 Correct 105 ms 27008 KB Output is correct
50 Correct 104 ms 26932 KB Output is correct
51 Correct 234 ms 56144 KB Output is correct
52 Correct 245 ms 55708 KB Output is correct
53 Correct 219 ms 25324 KB Output is correct
54 Correct 181 ms 38884 KB Output is correct
55 Correct 92 ms 23000 KB Output is correct
56 Correct 213 ms 51244 KB Output is correct
57 Correct 100 ms 23588 KB Output is correct
58 Correct 145 ms 24096 KB Output is correct
59 Correct 190 ms 49636 KB Output is correct