前缀积数组
给定一个由 N 个整数组成的数组 arr[] ,任务是根据给定的数组生成一个前缀乘积数组。
在前缀乘积数组中,i 第项优先于[I]= arr[I] arr[I–1]……* arr[0]
例:
输入: {1,2,3,4,5} 输出: {1,2,6,24,120} 解释: 前缀积数组将为{1,21,321,4321,54321} = {1,2,6,24,120} 输入: {2,4
进场: 按照以下步骤解决问题:
-
迭代给定数组,从索引 1 到N–1。
-
计算每个 i 第T3】指数的 arr[i] = arr[i] * arr[i-1]。
- 最后,打印前缀产品数组。
下面是上述方法的实现。
C++
// C++ Program to generate
// Prefix Product Array
#include <bits/stdc++.h>
using namespace std;
// Function to generate
// prefix product array
int prefixProduct(int a[],
int n)
{
// Update the array
// with the product of
// prefixes
for (int i = 1; i < n; i++) {
a[i] = a[i] * a[i - 1];
}
// Print the array
for (int j = 0; j < n; j++) {
cout << a[j] << ", ";
}
return 0;
}
// Driver Code
int main()
{
int arr[] = { 2, 4, 6, 5, 10 };
int N = sizeof(arr) / sizeof(arr[0]);
prefixProduct(arr, N);
return 0;
}
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to generate
// Prefix Product Array
class GFG{
// Function to generate
// prefix product array
static int prefixProduct(int []a, int n)
{
// Update the array
// with the product of
// prefixes
for(int i = 1; i < n; i++)
{
a[i] = a[i] * a[i - 1];
}
// Print the array
for(int j = 0; j < n; j++)
{
System.out.print(a[j] + ", ");
}
return 0;
}
// Driver Code
public static void main (String[] args)
{
int arr[] = new int[]{ 2, 4, 6, 5, 10 };
int N = 5;
prefixProduct(arr, N);
}
}
// This code is contributed by Ritik Bansal
Python 3
# Python3 Program to generate
# Prefix Product Array
# Function to generate
# prefix product array
def prefixProduct(a, n):
# Update the array
# with the product of
# prefixes
for i in range(1, n):
a[i] = a[i] * a[i - 1];
# Print the array
for j in range(0, n):
print(a[j], end = ", ");
return 0;
# Driver Code
arr = [ 2, 4, 6, 5, 10 ];
N = len(arr);
prefixProduct(arr, N);
# This code is contributed by Code_Mech
C
// C# program to generate
// Prefix Product Array
using System;
class GFG{
// Function to generate
// prefix product array
static int prefixProduct(int []a, int n)
{
// Update the array
// with the product of
// prefixes
for(int i = 1; i < n; i++)
{
a[i] = a[i] * a[i - 1];
}
// Print the array
for(int j = 0; j < n; j++)
{
Console.Write(a[j] + ", ");
}
return 0;
}
// Driver Code
public static void Main (string[] args)
{
int []arr = new int[]{ 2, 4, 6, 5, 10 };
int N = 5;
prefixProduct(arr, N);
}
}
// This code is contributed by rock_cool
java 描述语言
<script>
// Javascript Program to generate
// Prefix Product Array
// Function to generate
// prefix product array
function prefixProduct(a, n)
{
// Update the array
// with the product of
// prefixes
for (let i = 1; i < n; i++) {
a[i] = a[i] * a[i - 1];
}
// Print the array
for (let j = 0; j < n; j++) {
document.write(a[j] + ", ");
}
return 0;
}
let arr = [ 2, 4, 6, 5, 10 ];
let N = arr.length;
prefixProduct(arr, N);
</script>
Output:
2, 8, 48, 240, 2400
时间复杂度: O(N) 辅助空间: O(1)
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