如何在C++中比较两个向量

yeg*_*256 4 c++

这是我的代码:

#include <algorithm>
void f() {
    int[] a = {1, 2, 3, 4};
    int[] b = {1, 2, 100, 101};
    // I want to do something like this:
    // int* found = compare(a[0], a[3], b[0]);
    // in order to get a pointer to a[2]
}
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也许我在手册中错过了这个算法...请帮忙:)