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Submission #1018547

# Submission time Handle Problem Language Result Execution time Memory
1018547 2024-07-10T06:42:12 Z parsadox2 Horses (IOI15_horses) C++17
0 / 100
 292 ms 45900 KB 
#include "horses.h"
#include <bits/stdc++.h>

using namespace std;

const long long N = 5e5 + 10 , mod = 1e9 + 7;

long long n , x[N] , y[N] , mulx;
set <long long> st;

long long tav(long long a , long long b)
{
	long long res = 1;
	while(b)
	{
		if(b & 1)
			res = 1LL * res * a % mod;
		b >>= 1;
		a = 1LL * a * a % mod;
	}
	return res;
}

struct SEG{
	long long mx[N << 4];
	void Build(long long node = 1 , long long nl = 0 , long long nr = n)
	{
		if(nr - nl == 1)
		{
			mx[node] = y[nl];
			return;
		}
		long long mid = (nl + nr) >> 1 , lc = node << 1 , rc = lc | 1;
		Build(lc , nl , mid);  Build(rc , mid , nr);
		mx[node] = max(mx[lc] , mx[rc]);
	}
	void Update(long long id , long long node = 1 , long long nl = 0 , long long nr = n)
	{
		if(nr - nl == 1)
		{
			mx[node] = y[nl];
			return;
		}
		long long mid = (nl + nr) >> 1 , lc = node << 1 , rc = lc | 1;
		if(id < mid)
			Update(id , lc , nl , mid);
		else
			Update(id , rc , mid , nr);
		mx[node] = max(mx[lc] , mx[rc]);
	}
	long long Get(long long l , long long r , long long node = 1 , long long nl = 0 , long long nr = n)
	{
		if(r <= nl || nr <= l)
			return 0;
		if(l <= nl && nr <= r)
			return mx[node];
		long long mid = (nl + nr) >> 1 , lc = node << 1 , rc = lc | 1;
		return max(Get(l , r , lc , nl , mid) , Get(l , r , rc , mid , nr));
	}
} seg;

long long Solve()
{
	long long tmpx = 1 , mx_x = 1 , mx_y = 1;
	for(auto asd : st)
	{
		auto u = abs(asd);
		long long Y = seg.Get(u , n);
		if(Y > 1LL * mx_x * mx_y)
		{
			mx_y = Y;
			mx_x = x[u];
		}
		else
		{
			mx_x *= x[u];
		}
		tmpx *= x[u];
		if(mx_x * mx_y > mod)
			break;
	}
	long long res = mx_x * mx_y % mod;
	return 1LL * mulx * tav(tmpx , mod - 2) % mod * res % mod;
}

int init(int nn, int X[], int Y[]) {
	mulx = 1;
	n = nn;
	for(long long i = 0 ; i < n ; i++)
	{
		x[i] = X[i];
		y[i] = Y[i];
		mulx = 1LL * mulx * x[i] % mod;
	}
	seg.Build();
	for(long long i = 0 ; i < n ; i++)  if(x[i] > 1)
		st.insert(-i);
	return Solve();
}

int updateX(int pos, int val) {	
	if(x[pos] > 1)
		st.erase(-pos);
	mulx = 1LL * mulx * tav(x[pos] , mod - 2) % mod;
	x[pos] = val;
	if(x[pos] > 1)
		st.insert(-pos);
	mulx = 1LL * mulx * x[pos] % mod;
	return Solve();
}

int updateY(int pos, int val) {
	y[pos] = val;
	seg.Update(pos);
	return Solve();
}

Compilation message

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:98:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   98 |  return Solve();
      |         ~~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:109:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  109 |  return Solve();
      |         ~~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:115:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  115 |  return Solve();
      |         ~~~~~^~

Subtask #1
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4440 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4532 KB Output is correct
5 Incorrect 1 ms 4696 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Incorrect 0 ms 4444 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 292 ms 45780 KB Output is correct
2 Correct 246 ms 45772 KB Output is correct
3 Incorrect 246 ms 45900 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Incorrect 1 ms 4440 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Incorrect 1 ms 4444 KB Output isn't correct
6 Halted 0 ms 0 KB -