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답안 #823427

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
823427 2023-08-12T14:00:25 Z _martynas 말 (IOI15_horses) C++11
100 / 100
 399 ms 49252 KB 
#include "horses.h"
#include <bits/stdc++.h>

using namespace std;

using ll = long long;

#warning change mxn
const int mxn = 5e5+5;
const int mxval = 1e9;
const int mod = 1e9+7;

struct Seg {
	int mx[4*mxn];
	int get(int u, int l, int r, int ql, int qr) {
		if(qr < l || r < ql) return 0;
		if(ql <= l && r <= qr) return mx[u];
		int m = (l+r)/2;
		return max(get(2*u, l, m, ql, qr), get(2*u+1, m+1, r, ql, qr));
	}
	void set(int u, int l, int r, int i, int x) {
		if(l == r) {
			mx[u] = x; return;
		}
		int m = (l+r)/2;
		if(i <= m) set(2*u, l, m, i, x);
		else set(2*u+1, m+1, r, i, x);
		mx[u] = max(mx[2*u], mx[2*u+1]);
	}
} seg;
int n;
int x[mxn], y[mxn];
set<int> st;
ll tot = 1;

ll mod_pow(ll a, ll b) {
	ll ans = 1;
	while(b) {
		if(b & 1) ans = ans*a%mod;
		a = a*a%mod;
		b >>= 1;
	}
	return ans;
}

int get();
int init(int N, int X[], int Y[]) {
	n = N;
	copy(X, X+n, x); copy(Y, Y+n, y);
	for(int i = 0; i < N; i++) seg.set(1, 0, n-1, i, Y[i]);
	st.insert(0);
	st.insert(n);
	for(int i = n-1; i >= 0; i--) {
		if(X[i] > 1) {
			tot = tot*X[i]%mod;
			st.insert(i);
		}
	}
	return get();
}

int get() {
	ll acc = 1;
	int last = -1;
	auto rit = next(st.rbegin());
	while(rit != st.rend()) {
		acc *= x[*rit];
		last = *rit;
		if(acc > mxval) break;
		rit = next(rit);
	}
	auto it = st.lower_bound(last);
	ll mx = 0; acc = 1;
	while(next(it) != st.end()) {
		int i = *it;
		int j = *next(it);
		if(i != last) acc = acc*x[i];
		ll best_y = seg.get(1, 0, n-1, i, j-1);
		mx = max(mx, acc*best_y);
		it = next(it);
	}
	//printf("mx = %lld\n", mx);
	mx %= mod;
	return tot*mod_pow(acc, mod-2)%mod*mx%mod;
}

int updateX(int pos, int val) {
	tot = tot*mod_pow(x[pos], mod-2)%mod;
	x[pos] = val;
	tot = tot*val%mod;
	if(val > 1 || pos == 0) st.insert(pos);
	else (st.erase(pos));
	return get();
}

int updateY(int pos, int val) {
	seg.set(1, 0, n-1, pos, val);
	return get();
}

// int main(int argc, char const *argv[])
// {
// 	int N;
// 	cin >> N;
// 	int X[N], Y[N];
// 	for(int i = 0; i < N; i++) cin >> X[i];
// 	for(int i = 0; i < N; i++) cin >> Y[i];
// 	cout << "init: " << init(N, X, Y) << "\n";
// 	int M;
// 	cin >> M;
// 	for(int i = 0; i < M; i++) {
// 		int type; cin >> type;
// 		int pos, val; cin >> pos >> val;
// 		if(type == 1) {
// 			cout << "resp: " << updateX(pos, val) << "\n";
// 		}
// 		else {
// 			cout << "resp: " << updateY(pos, val) << "\n";
// 		}
// 	}
// 	return 0;
// }

Compilation message

horses.cpp:8:2: warning: #warning change mxn [-Wcpp]
    8 | #warning change mxn
      |  ^~~~~~~
horses.cpp: In function 'int get()':
horses.cpp:84:39: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   84 |  return tot*mod_pow(acc, mod-2)%mod*mx%mod;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

Subtask #1
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 308 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 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 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 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 212 KB Output is correct
15 Correct 1 ms 308 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 2 ms 320 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 3 ms 396 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 308 KB Output is correct
30 Correct 1 ms 420 KB Output is correct
31 Correct 2 ms 324 KB Output is correct
32 Correct 2 ms 340 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 399 ms 36604 KB Output is correct
2 Correct 366 ms 36688 KB Output is correct
3 Correct 330 ms 36660 KB Output is correct
4 Correct 313 ms 36636 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 304 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 304 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 2 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 312 KB Output is correct
30 Correct 1 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 71 ms 16376 KB Output is correct
34 Correct 64 ms 16392 KB Output is correct
35 Correct 179 ms 46612 KB Output is correct
36 Correct 179 ms 46756 KB Output is correct
37 Correct 87 ms 14472 KB Output is correct
38 Correct 109 ms 27220 KB Output is correct
39 Correct 57 ms 14216 KB Output is correct
40 Correct 166 ms 41676 KB Output is correct
41 Correct 69 ms 14356 KB Output is correct
42 Correct 76 ms 14312 KB Output is correct
43 Correct 156 ms 42060 KB Output is correct
44 Correct 158 ms 42092 KB Output is correct

Subtask #5
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 308 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 0 ms 312 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 3 ms 324 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 2 ms 340 KB Output is correct
32 Correct 2 ms 340 KB Output is correct
33 Correct 387 ms 40500 KB Output is correct
34 Correct 280 ms 49252 KB Output is correct
35 Correct 276 ms 40436 KB Output is correct
36 Correct 354 ms 44308 KB Output is correct
37 Correct 66 ms 16348 KB Output is correct
38 Correct 65 ms 16328 KB Output is correct
39 Correct 182 ms 46692 KB Output is correct
40 Correct 180 ms 46528 KB Output is correct
41 Correct 90 ms 14468 KB Output is correct
42 Correct 108 ms 27264 KB Output is correct
43 Correct 57 ms 14308 KB Output is correct
44 Correct 164 ms 41816 KB Output is correct
45 Correct 71 ms 14312 KB Output is correct
46 Correct 76 ms 14328 KB Output is correct
47 Correct 157 ms 42060 KB Output is correct
48 Correct 161 ms 42128 KB Output is correct
49 Correct 136 ms 19368 KB Output is correct
50 Correct 131 ms 19392 KB Output is correct
51 Correct 274 ms 48548 KB Output is correct
52 Correct 238 ms 48116 KB Output is correct
53 Correct 371 ms 17676 KB Output is correct
54 Correct 222 ms 31164 KB Output is correct
55 Correct 142 ms 15364 KB Output is correct
56 Correct 236 ms 43608 KB Output is correct
57 Correct 225 ms 16000 KB Output is correct
58 Correct 310 ms 16412 KB Output is correct
59 Correct 164 ms 41996 KB Output is correct