C ++函数std::algorithm::lexicographical_compare()测试一个范围是否在字典上小于另一个范围。字典比较是一种比较,通常用于在字典中按字母顺序对单词进行排序。
模板<class InputIterator1,class InputIterator2>
bool lexicographical_compare(InputIterator1 first1,InputIterator1 last1,InputIterator2 first2,InputIterator2 last2);
Begin result = lexicographical_compare(v1.begin(), v1.end(), v2.begin(), v2.end()) if (result == true) Print v1 is less than v2 result = lexicographical_compare(v1.begin(), v1.end(), v2.begin(), v2.end()) if (result == false) Print v1 is not less than v2 End
#include <iostream> #include <vector> #include <algorithm> #include <string> using namespace std; int main(void) { //v1和v2的初始化 vector<string> v1 = {"One", "Two", "Three"}; vector<string> v2 = {"one", "two", "three"}; bool result; result = lexicographical_compare(v1.begin(), v1.end(), v2.begin(), v2.end()); if (result == true) cout << "v1 is less than v2." << endl; v1[0] = "two"; result = lexicographical_compare(v1.begin(), v1.end(), v2.begin(), v2.end()); if (result == false) cout << "v1 is not less than v2." << endl; return 0; }
输出结果
v1 is less than v2. v1 is not less than v2.