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답안 #567867

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
567867 2022-05-24T09:39:25 Z ngpin04 말 (IOI15_horses) C++17
100 / 100
 714 ms 58852 KB 
#include <bits/stdc++.h>
#include "horses.h"
#define fi first
#define se second
#define mp make_pair
#define TASK ""
#define bit(x) (1LL << (x))
#define getbit(x, i) (((x) >> (i)) & 1)
#define ALL(x) (x).begin(), (x).end() 
using namespace std;
template <typename T1, typename T2> bool mini(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maxi(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}
mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());

int rand(int l, int r) {
	return l + rd() % (r - l + 1);
}
const int N = 5e5 + 5; 
const int oo = 1e9;
const long long ooo = 1e18;
const int mod = 1e9 + 7; // 998244353;
const long double pi = acos(-1);

struct segtree {
	int n;
	vector <int> st;

	segtree(int _n = 0){
		n = _n;
		st.assign((n << 2) + 5, 0);
	}

	void update(int id, int l, int r, int pos, int val) {
		if (l > pos || r < pos)
			return;
		if (l == r) {
			st[id] = val;
			return;
		}
		int mid = (l + r) >> 1;
		update(id << 1, l, mid, pos, val);
		update(id << 1 | 1, mid + 1, r, pos, val);
		st[id] = max(st[id << 1], st[id << 1 | 1]);
	}

	void update(int pos, int val) {
		update(1, 1, n, pos, val);
	}

	int getmax(int id, int l, int r, int u, int v) {
		if (l > v || r < u)
			return 0;
		if (l >= u && r <= v) 
			return st[id];
		int mid = (l + r) >> 1;
		int lnode = getmax(id << 1, l, mid, u, v);
		int rnode = getmax(id << 1 | 1, mid + 1, r, u, v);
		return max(lnode, rnode);
	}

	int getmax(int l, int r) {
		return getmax(1, 1, n, l, r);
	}
};

struct BIT {
	int n;
	vector <int> bit;

	BIT(int _n = 0){
		n = _n;
		bit.assign(n + 5, 1);
	}

	void update(int pos, int val) {
		for (; pos <= n; pos += pos & -pos)
			bit[pos] = (long long) bit[pos] * val % mod;
	}

	int getmul(int pos) {
		int res = 1;
		for (; pos; pos -= pos & -pos)
			res = (long long) res * bit[pos] % mod;
		return res;
	}
};


BIT bit;
segtree st; 

set <int> pos;

int l[N];
int r[N];
int x[N];
int y[N];
int n;

int bpow(int x, int k) {
	int res = 1;
	for (; k; k >>= 1, x = (long long) x * x % mod)
		if (k & 1) 
			res = (long long) res * x % mod;
	return res;
}

void build() {
	st = segtree(n);
	bit = BIT(n);
	pos.insert(0);
	pos.insert(n + 1);
	r[0] = n + 1;
	l[n + 1] = 0;

	for (int i = 1; i <= n; i++) if (x[i] > 1) {
		auto it = pos.upper_bound(i);
		int v = *it;
		int u = *(--it);
		l[i] = u;
		r[i] = v;

		r[u] = i;
		l[v] = i;
		
		pos.insert(i);
		bit.update(i, x[i]);
	}

	for (int i = 1; i <= n; i++)
		st.update(i, y[i]);
}

int solve() {
	vector <int> cand;
	long long tot = 1;
	for (int i = n + 1; i > 0 && tot < oo; i = l[i]) {
		cand.push_back(i);
		if (i <= n)
			tot *= x[i];
	}

	if (tot < oo && cand.back() != 1)
		cand.push_back(1);

	reverse(ALL(cand));

	pair <long long, long long> ans = mp(1, 0);

	long long cur = 1;
	int pos = 0;
	for (int it = 0; it + 1 < (int) cand.size(); it++) {
		int i = cand[it];
		int j = cand[it + 1];
		cur *= x[i];
		// cerr << cur << " " << i << " " << j << "\n";
		int mx = st.getmax(i, j - 1);

		if (cur / ans.fi > ans.se / mx) {
			pos = it;
			ans = mp(cur, mx);
		}

	}	

	int ret = bit.getmul(cand[pos]);
	ret = (long long) ret * st.getmax(cand[pos], cand[pos + 1] - 1) % mod;
	return ret;
}

int init(int N, int X[], int Y[]) {
	n = N;
	for (int i = 1; i <= n; i++)
		x[i] = X[i - 1];

	for (int i = 1; i <= n; i++)
		y[i] = Y[i - 1];

	build();
	return solve();
}

int updateX(int i, int val) {	
	i++;
	if (x[i] > 1) {
		pos.erase(i);
		auto it = pos.upper_bound(i);
		int v = *it;
		int u = *(--it);

		r[u] = v;
		l[v] = u;
	}

	bit.update(i, bpow(x[i], mod - 2));

	x[i] = val;

	bit.update(i, x[i]);

	if (x[i] > 1) {
		auto it = pos.upper_bound(i);
		int v = *it;
		int u = *(--it);

		r[u] = i;
		l[v] = i;

		r[i] = v;
		l[i] = u;

		pos.insert(i);
	}
	return solve();
}

int updateY(int pos, int val) {
	pos++;
	st.update(pos, val);
	return solve();
}

//#include "grader.cpp"

Compilation message

horses.cpp: In function 'int rand(int, int)':
horses.cpp:20:11: warning: conversion from 'std::mersenne_twister_engine<long unsigned int, 64, 312, 156, 31, 13043109905998158313, 29, 6148914691236517205, 17, 8202884508482404352, 37, 18444473444759240704, 43, 6364136223846793005>::result_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   20 |  return l + rd() % (r - l + 1);
      |         ~~^~~~~~~~~~~~~~~~~~~~
horses.cpp: In member function 'void BIT::update(int, int)':
horses.cpp:81:42: warning: conversion from 'long long int' to '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} may change value [-Wconversion]
   81 |    bit[pos] = (long long) bit[pos] * val % mod;
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In member function 'int BIT::getmul(int)':
horses.cpp:87:37: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   87 |    res = (long long) res * bit[pos] % mod;
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int bpow(int, int)':
horses.cpp:104:14: warning: declaration of 'x' shadows a global declaration [-Wshadow]
  104 | int bpow(int x, int k) {
      |          ~~~~^
horses.cpp:100:5: note: shadowed declaration is here
  100 | int x[N];
      |     ^
horses.cpp:106:43: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  106 |  for (; k; k >>= 1, x = (long long) x * x % mod)
      |                         ~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:108:30: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  108 |    res = (long long) res * x % mod;
      |          ~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int solve()':
horses.cpp:155:6: warning: declaration of 'pos' shadows a global declaration [-Wshadow]
  155 |  int pos = 0;
      |      ^~~
horses.cpp:96:11: note: shadowed declaration is here
   96 | set <int> pos;
      |           ^~~
horses.cpp:171:66: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  171 |  ret = (long long) ret * st.getmax(cand[pos], cand[pos + 1] - 1) % mod;
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:175:14: warning: declaration of 'N' shadows a global declaration [-Wshadow]
  175 | int init(int N, int X[], int Y[]) {
      |          ~~~~^
horses.cpp:22:11: note: shadowed declaration is here
   22 | const int N = 5e5 + 5;
      |           ^
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:221:17: warning: declaration of 'pos' shadows a global declaration [-Wshadow]
  221 | int updateY(int pos, int val) {
      |             ~~~~^~~
horses.cpp:96:11: note: shadowed declaration is here
   96 | set <int> pos;
      |           ^~~

Subtask #1
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 308 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 308 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 312 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 316 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 316 KB Output is correct
18 Correct 1 ms 312 KB Output is correct
19 Correct 1 ms 312 KB Output is correct
20 Correct 1 ms 340 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 312 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 312 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 308 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 312 KB Output is correct
15 Correct 1 ms 308 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 312 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 404 KB Output is correct
24 Correct 2 ms 340 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 2 ms 340 KB Output is correct
27 Correct 3 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 2 ms 340 KB Output is correct
30 Correct 2 ms 340 KB Output is correct
31 Correct 3 ms 340 KB Output is correct
32 Correct 3 ms 324 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 680 ms 48592 KB Output is correct
2 Correct 504 ms 48596 KB Output is correct
3 Correct 503 ms 48556 KB Output is correct
4 Correct 621 ms 48576 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 224 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 308 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 316 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 468 KB Output is correct
24 Correct 2 ms 340 KB Output is correct
25 Correct 2 ms 448 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 3 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 2 ms 340 KB Output is correct
31 Correct 2 ms 340 KB Output is correct
32 Correct 3 ms 340 KB Output is correct
33 Correct 97 ms 25904 KB Output is correct
34 Correct 106 ms 25876 KB Output is correct
35 Correct 343 ms 56204 KB Output is correct
36 Correct 346 ms 56220 KB Output is correct
37 Correct 137 ms 22092 KB Output is correct
38 Correct 203 ms 36852 KB Output is correct
39 Correct 96 ms 20044 KB Output is correct
40 Correct 340 ms 51276 KB Output is correct
41 Correct 111 ms 20184 KB Output is correct
42 Correct 128 ms 20100 KB Output is correct
43 Correct 306 ms 51704 KB Output is correct
44 Correct 350 ms 51708 KB Output is correct

Subtask #5
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 312 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 280 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 312 KB Output is correct
20 Correct 1 ms 308 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 340 KB Output is correct
24 Correct 3 ms 340 KB Output is correct
25 Correct 3 ms 468 KB Output is correct
26 Correct 2 ms 340 KB Output is correct
27 Correct 4 ms 320 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 2 ms 340 KB Output is correct
30 Correct 2 ms 340 KB Output is correct
31 Correct 2 ms 340 KB Output is correct
32 Correct 5 ms 340 KB Output is correct
33 Correct 714 ms 50240 KB Output is correct
34 Correct 536 ms 58852 KB Output is correct
35 Correct 518 ms 50080 KB Output is correct
36 Correct 638 ms 53852 KB Output is correct
37 Correct 98 ms 25840 KB Output is correct
38 Correct 112 ms 25904 KB Output is correct
39 Correct 357 ms 56272 KB Output is correct
40 Correct 361 ms 56240 KB Output is correct
41 Correct 132 ms 22156 KB Output is correct
42 Correct 210 ms 36844 KB Output is correct
43 Correct 97 ms 19984 KB Output is correct
44 Correct 325 ms 51316 KB Output is correct
45 Correct 126 ms 20228 KB Output is correct
46 Correct 125 ms 20024 KB Output is correct
47 Correct 298 ms 51652 KB Output is correct
48 Correct 325 ms 51616 KB Output is correct
49 Correct 203 ms 28916 KB Output is correct
50 Correct 183 ms 28892 KB Output is correct
51 Correct 471 ms 58152 KB Output is correct
52 Correct 392 ms 57608 KB Output is correct
53 Correct 588 ms 25208 KB Output is correct
54 Correct 384 ms 40728 KB Output is correct
55 Correct 187 ms 21100 KB Output is correct
56 Correct 426 ms 53196 KB Output is correct
57 Correct 371 ms 21824 KB Output is correct
58 Correct 544 ms 22152 KB Output is correct
59 Correct 292 ms 51636 KB Output is correct