X 的最小值,使得 arr[I]–X 上升到 brr[i]的幂的和小于或等于 K
给定一个由 N 个整数和一个正整数 K 组成的数组arr【】】和brr【】,任务是找到 X 的最小值,使得所有数组元素(arr[I]–X,0) 的最大值之和上升到 brr[i] 的幂
示例:
输入: arr[] = {2,1,4,3,5} brr[] = { 4,3,2,3,1},K = 12 输出: 2 解释: 把 X 的值看作 2,那么给定表达式的值是: =>max(2–2,0)4+max(1–2,0) 3 【T13 0)3+最大值(5–2,0)1 =>04+03+22+13+31= 8<= K(= 12)。 因此,X 的合成值为 2,为最小值。
输入: arr[] = {2,1,4,3,5} brr[] = { 4,3,2,3,1},K = 22 输出: 1
天真法:解决给定问题最简单的方法是检查从 0 到数组的最大元素的 X 的每个值,如果存在满足给定条件的 X 的任何值,则打印出 X 和的那个值脱离循环。
时间复杂度: O(NM),其中,M 为 阵的最大元素 。* 辅助空间: O(1)
高效法:上述方法也可以通过使用二分搜索法找到 X 的值来优化,如果 X 的某个特定值满足上述条件,那么,所有更大的值也会满足,因此,然后尝试搜索更小的值。按照以下步骤解决问题:
- 定义一个函数 检查(a[],b[],k,n,x):
- 将变量 sum 初始化为 0 以根据数组 arr[] 和 brr[]。
- 使用变量 i 迭代范围【0,N】,并将幂(max(arr[I]–x,0),brr[i]) 的值加到变量和上。
- 如果和的值小于等于 K ,则返回真。否则,返回假。
- 初始化变量,说低为 0 ,说高为数组最大值。
- 循环迭代直到低小于高,执行以下步骤:
- 执行上述步骤后,将低的值打印为期望的值 X 作为答案。
下面是上述方法的实现:
C++14
// C++ program for the above approach
#include <bits/stdc++.h>
using namespace std;
// Function to check if there exists an
// X that satisfies the given conditions
bool check(int a[], int b[], int k, int n, int x)
{
int sum = 0;
// Find the required value of the
// given expression
for (int i = 0; i < n; i++) {
sum = sum + pow(max(a[i] - x, 0), b[i]);
}
if (sum <= k)
return true;
else
return false;
}
// Function to find the minimum value
// of X using binary search.
int findMin(int a[], int b[], int n, int k)
{
// Boundaries of the Binary Search
int l = 0, u = *max_element(a, a + n);
while (l < u) {
// Find the middle value
int m = (l + u) / 2;
// Check for the middle value
if (check(a, b, k, n, m)) {
// Update the upper
u = m;
}
else {
// Update the lower
l = m + 1;
}
}
return l;
}
// Driver Code
int main()
{
int arr[] = { 2, 1, 4, 3, 5 };
int brr[] = { 4, 3, 2, 3, 1 };
int K = 12;
int N = sizeof(arr) / sizeof(arr[0]);
cout << findMin(arr, brr, N, K);
return 0;
}
Java 语言(一种计算机语言,尤用于创建网站)
// Java program for the above approach
import java.io.*;
class GFG{
// Function to check if it is possible to
// get desired result
static boolean check(int a[], int b[], int k, int x)
{
int sum = 0;
for(int i = 0; i < a.length; i++)
{
sum = sum + (int)Math.pow(
Math.max(a[i] - x, 0), b[i]);
}
if (sum <= k)
return true;
else
return false;
}
// Function to find the minimum value
// of X using binary search.
static int findMin(int a[], int b[], int n, int k)
{
// Boundaries of the Binary Search
int l = 0, u = (int)1e9;
while (l < u)
{
// Find the middle value
int m = (l + u) / 2;
// Check for the middle value
if (check(a, b, k, m))
// Update the upper
u = m;
else
// Update the lower
l = m + 1;
}
return l;
}
// Driver code
public static void main(String[] args)
{
int n = 5;
int k = 12;
int a[] = { 2, 1, 4, 3, 5 };
int b[] = { 4, 3, 2, 3, 1 };
System.out.println(findMin(a, b, n, k));
}
}
// This code is contributed by ayush_dragneel
Python 3
# Python 3 program for the above approach
# Function to check if there exists an
# X that satisfies the given conditions
def check(a, b, k, n, x):
sum = 0
# Find the required value of the
# given expression
for i in range(n):
sum = sum + pow(max(a[i] - x, 0), b[i])
if (sum <= k):
return True
else:
return False
# Function to find the minimum value
# of X using binary search.
def findMin(a, b, n, k):
# Boundaries of the Binary Search
l = 0
u = max(a)
while (l < u):
# Find the middle value
m = (l + u) // 2
# Check for the middle value
if (check(a, b, k, n, m)):
# Update the upper
u = m
else:
# Update the lower
l = m + 1
return l
# Driver Code
if __name__ == '__main__':
arr = [2, 1, 4, 3, 5]
brr = [4, 3, 2, 3, 1]
K = 12
N = len(arr)
print(findMin(arr, brr, N, K))
# This code is contributed by ipg2016107.
C
// C# program for the above approach
using System;
public class GFG{
// Function to check if it is possible to
// get desired result
static bool check(int []a, int []b, int k, int x)
{
int sum = 0;
for(int i = 0; i < a.Length; i++)
{
sum = sum + (int)Math.Pow(
Math.Max(a[i] - x, 0), b[i]);
}
if (sum <= k)
return true;
else
return false;
}
// Function to find the minimum value
// of X using binary search.
static int findMin(int []a, int []b, int n, int k)
{
// Boundaries of the Binary Search
int l = 0, u = (int)1e9;
while (l < u)
{
// Find the middle value
int m = (l + u) / 2;
// Check for the middle value
if (check(a, b, k, m))
// Update the upper
u = m;
else
// Update the lower
l = m + 1;
}
return l;
}
// Driver code
public static void Main(String[] args)
{
int n = 5;
int k = 12;
int []a = { 2, 1, 4, 3, 5 };
int []b = { 4, 3, 2, 3, 1 };
Console.WriteLine(findMin(a, b, n, k));
}
}
// This code is contributed by Princi Singh
java 描述语言
<script>
// JavaScript program for the above approache9 + 7;
// Function to check if there exists an
// X that satisfies the given conditions
function check(a, b, k, n, x) {
let sum = 0;
// Find the required value of the
// given expression
for (let i = 0; i < n; i++) {
sum = sum + Math.pow(Math.max(a[i] - x, 0), b[i]);
}
if (sum <= k)
return true;
else
return false;
}
function max_element(a) {
let maxi = Number.MIN_VALUE;
for (let i = 0; i < a.length; i++) {
if (a[i] > maxi) {
maxi = a[i];
}
}
return maxi;
}
// Function to find the minimum value
// of X using binary search.
function findMin(a, b, n, k) {
// Boundaries of the Binary Search
let l = 0, u = max_element(a);
while (l < u) {
// Find the middle value
let m = Math.floor((l + u) / 2);
// Check for the middle value
if (check(a, b, k, n, m)) {
// Update the upper
u = m;
}
else {
// Update the lower
l = m + 1;
}
}
return l;
}
// Driver Code
let arr = [2, 1, 4, 3, 5];
let brr = [4, 3, 2, 3, 1];
let K = 12;
let N = arr.length;
document.write(findMin(arr, brr, N, K));
// This code is contributed by Potta Lokesh
</script>
Output
2
时间复杂度: O(Nlog M),其中,M 为 阵的最大元素 。* 辅助空间: O(1)
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