给定两个数组,请使用C++中的STL查找这两个数组之间的公共元素。
例子:
Input:
arr1[] = {1, 45, 54, 71, 76, 12},
arr2[] = {1, 7, 5, 4, 6, 12}
Output: {1, 12}
Input:
arr1[] = {1, 7, 5, 4, 6, 12},
arr2[] = {10, 12, 11}
Output: {1, 4, 12}
方法:可以通过STL中提供的set_intersection()函数找到常见元素。
句法:
set_intersection (InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, InputIterator2 last2,
OutputIterator result);
// C++ program to find common elements
// between two Arrays using STL
#include
using namespace std;
int main()
{
// Get the array
int arr1[] = { 1, 45, 54, 71, 76, 12 };
int arr2[] = { 1, 7, 5, 4, 6, 12 };
// Compute the sizes
int n1 = sizeof(arr1) / sizeof(arr1[0]);
int n2 = sizeof(arr2) / sizeof(arr2[0]);
// Sort the arrays
sort(arr1, arr1 + n1);
sort(arr2, arr2 + n2);
// Print the array
cout << "First Array: ";
for (int i = 0; i < n1; i++)
cout << arr1[i] << " ";
cout << endl;
cout << "Second Array: ";
for (int i = 0; i < n2; i++)
cout << arr2[i] << " ";
cout << endl;
// Initialise a vector
// to store the common values
// and an iterator
// to traverse this vector
vector v(n1 + n2);
vector::iterator it, st;
it = set_intersection(arr1, arr1 + n1,
arr2, arr2 + n2,
v.begin());
cout << "\nCommon elements:\n";
for (st = v.begin(); st != it; ++st)
cout << *st << ", ";
cout << '\n';
return 0;
}
输出:
First Array: 1 12 45 54 71 76
Second Array: 1 4 5 6 7 12
Common elements:
1, 12,
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