Submission #599082

#	Time	Username	Problem	Language	Result	Execution time	Memory
599082		Temmie	Horses (IOI15_horses)	C++17	0 / 100	1558 ms	35732 KiB

horses

#include <bits/stdc++.h>

struct Seg_max {
	
	int size;
	std::vector <int> v;
	
	Seg_max(int s) {
		size = 1;
		while (size < s) {
			size <<= 1;
		}
		v.resize(size << 1, 0);
	}
	
	void update(int ind, int val) {
		update(ind, val, 0, 0, size);
	}
	
	void update(int ind, int val, int now, int l, int r) {
		if (!(r - l - 1)) {
			v[now] = val;
			return;
		}
		int mid = (l + r) >> 1;
		if (ind < mid) {
			update(ind, val, now * 2 + 1, l, mid);
		} else {
			update(ind, val, now * 2 + 2, mid, r);
		}
		v[now] = std::max(v[now * 2 + 1], v[now * 2 + 2]);
	}
	
	int query(int l, int r) {
		return query(l, r, 0, 0, size);
	}
	
	int query(int tl, int tr, int now, int l, int r) {
		if (l >= tr || r <= tl) {
			return 0;
		}
		if (l >= tl && r <= tr) {
			return v[now];
		}
		int mid = (l + r) >> 1;
		return std::max(query(tl, tr, now * 2 + 1, l, mid), query(tl, tr, now * 2 + 2, mid, r));
	}
	
};

constexpr const int mod = 1e9 + 7;

int pw(int x, int p) {
	int res = 1;
	while (p) {
		if (p & 1) {
			res = (long long) res * x % mod;
		}
		p >>= 1;
		x = (long long) x * x % mod;
	}
	return res;
}

int inv(int val) {
	return pw(val, mod - 2);
}

int dv(int nu, int de) {
	nu %= mod;
	de %= mod;
	return (long long) nu * inv(de);
}

int n;
std::vector <int> gr, pr;
Seg_max seg_max(0);
std::set <int> st;

int tot_gr;

int get() {
	st.insert(0);
	for (int i = 0; i < n; i++) st.insert(i); // temp
	long long gr_div = 1;
	int res = (long long) tot_gr * pr[n - 1] % mod;
	for (auto it = st.rbegin(); it != st.rend(); it++) {
		int ind = *it;
		int sfmx = seg_max.query(ind, n);
		if (sfmx >= gr_div || res <= (long long) dv(tot_gr, gr_div) * sfmx % mod) {
			res = (long long) dv(tot_gr, gr_div) * sfmx % mod;
		}
		gr_div *= gr[ind];
		if (gr_div > (1LL << 30)) {
			break;
		}
	}
	return res;
}

int init(int _n, int _gr[], int _pr[]) {
	n = _n;
	gr.resize(n);
	pr.resize(n);
	seg_max = Seg_max(n);
	tot_gr = 1;
	for (int i = 0; i < n; i++) {
		gr[i] = _gr[i];
		pr[i] = _pr[i];
		if (gr[i] > 1) st.insert(i);
		seg_max.update(i, pr[i]);
		tot_gr = (long long) tot_gr * gr[i] % mod;
	}
	return get();
}

// gr
int updateX(int pos, int val) {
	tot_gr = dv(tot_gr, gr[pos]);
	tot_gr = (long long) tot_gr * (gr[pos] = val) % mod;
	st.erase(pos);
	if (gr[pos] > 1) st.insert(pos);
	return get();
}

// pr
int updateY(int pos, int val) {
	seg_max.update(pos, pr[pos] = val);
	return get();
}

Compilation message (stderr)

horses.cpp: In function 'int pw(int, int)':
horses.cpp:57:30: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   57 |    res = (long long) res * x % mod;
      |          ~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:60:25: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   60 |   x = (long long) x * x % mod;
      |       ~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int get()':
horses.cpp:86:43: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   86 |  int res = (long long) tot_gr * pr[n - 1] % mod;
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:90:55: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   90 |   if (sfmx >= gr_div || res <= (long long) dv(tot_gr, gr_div) * sfmx % mod) {
      |                                                       ^~~~~~
horses.cpp:91:33: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   91 |    res = (long long) dv(tot_gr, gr_div) * sfmx % mod;
      |                                 ^~~~~~
horses.cpp:91:48: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   91 |    res = (long long) dv(tot_gr, gr_div) * sfmx % mod;
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:112:39: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  112 |   tot_gr = (long long) tot_gr * gr[i] % mod;
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:120:48: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  120 |  tot_gr = (long long) tot_gr * (gr[pos] = val) % mod;
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23