我想使用 c++ 算法库中的函数 lexicographical_compare。
但就using语句而言,我不知道该写什么。例如
using std::lexicographical_compare ??
我以后该如何解决这个问题?
谢谢
最佳答案
就这样
using std::lexicographical_compare;
然后(从 SGI STL Doc 复制)
int main()
{
int A1[] = {3, 1, 4, 1, 5, 9, 3};
int A2[] = {3, 1, 4, 2, 8, 5, 7};
int A3[] = {1, 2, 3, 4};
int A4[] = {1, 2, 3, 4, 5};
const int N1 = sizeof(A1) / sizeof(int);
const int N2 = sizeof(A2) / sizeof(int);
const int N3 = sizeof(A3) / sizeof(int);
const int N4 = sizeof(A4) / sizeof(int);
bool C12 = lexicographical_compare(A1, A1 + N1, A2, A2 + N2);
bool C34 = lexicographical_compare(A3, A3 + N3, A4, A4 + N4);
cout << "A1[] < A2[]: " << (C12 ? "true" : "false") << endl;
cout << "A3[] < A4[]: " << (C34 ? "true" : "false") << endl;
}
或者
// no using statement
int main()
{
//... same as above
bool C12 = std::lexicographical_compare(A1, A1 + N1, A2, A2 + N2);
bool C34 = std::lexicographical_compare(A3, A3 + N3, A4, A4 + N4);
//... same as above
}
要了解 future 的自己,请从头到尾阅读一本 C++ 书籍(例如 Stroustrup 的“The C++ Programming Language”)。
关于C++ lexicographical_compare 有什么用?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2033311/