给定两个数组 A[] 和 B[],分别由 n 和 m 个元素组成。找出要从每个数组中删除的最小元素数,使得两个数组中不存在公共元素。
例子:
Input : A[] = { 1, 2, 3, 4}
B[] = { 2, 3, 4, 5, 8 }
Output : 3
We need to remove 2, 3 and 4 from any array.
Input : A[] = { 4, 2, 4, 4}
B[] = { 4, 3 }
Output : 1
We need to remove 4 from B[]
Input : A[] = { 1, 2, 3, 4 }
B[] = { 5, 6, 7 }
Output : 0
There is no common element in both.
计算两个数组中每个数字的出现次数。如果两个数组中都有一个数字,则从它出现的次数较少的数组中删除数字,将其添加到结果中。
C++
// CPP program to find minimum element
// to remove so no common element
// exist in both array
#include
using namespace std;
// To find no elements to remove
// so no common element exist
int minRemove(int a[], int b[], int n, int m)
{
// To store count of array element
unordered_map countA, countB;
// Count elements of a
for (int i = 0; i < n; i++)
countA[a[i]]++;
// Count elements of b
for (int i = 0; i < m; i++)
countB[b[i]]++;
// Traverse through all common element, and
// pick minimum occurrence from two arrays
int res = 0;
for (auto x : countA)
if (countB.find(x.first) != countB.end())
res += min(x.second, countB[x.first]);
// To return count of minimum elements
return res;
}
// Driver program to test minRemove()
int main()
{
int a[] = { 1, 2, 3, 4 };
int b[] = { 2, 3, 4, 5, 8 };
int n = sizeof(a) / sizeof(a[0]);
int m = sizeof(b) / sizeof(b[0]);
cout << minRemove(a, b, n, m);
return 0;
}
Java
// JAVA Code to Remove minimum number of elements
// such that no common element exist in both array
import java.util.*;
class GFG {
// To find no elements to remove
// so no common element exist
public static int minRemove(int a[], int b[], int n,
int m)
{
// To store count of array element
HashMap countA = new HashMap<
Integer, Integer>();
HashMap countB = new HashMap<
Integer, Integer>();
// Count elements of a
for (int i = 0; i < n; i++){
if (countA.containsKey(a[i]))
countA.put(a[i], countA.get(a[i]) + 1);
else countA.put(a[i], 1);
}
// Count elements of b
for (int i = 0; i < m; i++){
if (countB.containsKey(b[i]))
countB.put(b[i], countB.get(b[i]) + 1);
else countB.put(b[i], 1);
}
// Traverse through all common element, and
// pick minimum occurrence from two arrays
int res = 0;
Set s = countA.keySet();
for (int x : s)
if(countB.containsKey(x))
res += Math.min(countB.get(x),
countA.get(x));
// To return count of minimum elements
return res;
}
/* Driver program to test above function */
public static void main(String[] args)
{
int a[] = { 1, 2, 3, 4 };
int b[] = { 2, 3, 4, 5, 8 };
int n = a.length;
int m = b.length;
System.out.println(minRemove(a, b, n, m));
}
}
// This code is contributed by Arnav Kr. Mandal.
Python3
# Python3 program to find minimum
# element to remove so no common
# element exist in both array
# To find no elements to remove
# so no common element exist
def minRemove(a, b, n, m):
# To store count of array element
countA = dict()
countB = dict()
# Count elements of a
for i in range(n):
countA[a[i]] = countA.get(a[i], 0) + 1
# Count elements of b
for i in range(n):
countB[b[i]] = countB.get(b[i], 0) + 1
# Traverse through all common
# element, and pick minimum
# occurrence from two arrays
res = 0
for x in countA:
if x in countB.keys():
res += min(countA[x],countB[x])
# To return count of
# minimum elements
return res
# Driver Code
a = [ 1, 2, 3, 4 ]
b = [2, 3, 4, 5, 8 ]
n = len(a)
m = len(b)
print(minRemove(a, b, n, m))
# This code is contributed
# by mohit kumar
C#
// C# Code to Remove minimum number of elements
// such that no common element exist in both array
using System;
using System.Collections.Generic;
class GFG
{
// To find no elements to remove
// so no common element exist
public static int minRemove(int []a, int []b, int n,
int m)
{
// To store count of array element
Dictionary countA = new Dictionary();
DictionarycountB = new Dictionary();
// Count elements of a
for (int i = 0; i < n; i++)
{
if (countA.ContainsKey(a[i]))
{
var v = countA[a[i]];
countA.Remove(countA[a[i]]);
countA.Add(a[i], v + 1);
}
else countA.Add(a[i], 1);
}
// Count elements of b
for (int i = 0; i < m; i++)
{
if (countB.ContainsKey(b[i]))
{
var v = countB[b[i]];
countB.Remove(countB[b[i]]);
countB.Add(b[i], v + 1);
}
else countB.Add(b[i], 1);
}
// Traverse through all common element, and
// pick minimum occurrence from two arrays
int res = 0;
foreach (int x in countA.Keys)
if(countB.ContainsKey(x))
res += Math.Min(countB[x],
countA[x]);
// To return count of minimum elements
return res;
}
/* Driver code */
public static void Main(String[] args)
{
int []a = { 1, 2, 3, 4 };
int []b = { 2, 3, 4, 5, 8 };
int n = a.Length;
int m = b.Length;
Console.WriteLine(minRemove(a, b, n, m));
}
}
// This code has been contributed by 29AjayKumar
Javascript
输出:
3
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