C++ 程式在 STL 中實現 LexicoGraphical_Compare
C++ 函式 std::algorithm::lexicographical_compare() 會測試一個範圍是否詞法上小於另一個,或與另一個是否相等。詞法上的比較通常用於對字典中的單詞按字母順序排序。
宣告
template <class InputIterator1, class InputIterator2>
bool lexicographical_compare(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2);
演算法
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
示例
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
int main(void) {
//initialization of v1 and v2
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;
}輸出
v1 is less than v2. v1 is not less than v2.
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