96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
#include <algorithm>
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#include <iostream>
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#include <vector>
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// 比較函式：整數由大到小排序
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bool cmpInt(int a, int b) {
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return a > b;
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}
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// 定義學生結構
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struct student {
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int number; // 學號
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int score; // 成績
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};
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// 學號升冪排序
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bool cmpStucdentnumberUp(student a, student b) {
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return a.number < b.number;
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}
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// 學號降冪排序
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bool cmpStucdentnumberDown(student a, student b) {
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return a.number > b.number;
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}
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// 成績升冪排序
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bool cmpStucdentScoreUp(student a, student b) {
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return a.score < b.score;
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}
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// 成績降冪排序
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bool cmpStucdentScoreDown(student a, student b) {
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return a.score > b.score;
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}
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int main() {
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// ----------- int 排序範例 -----------
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// 建立一個整數 vector
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std::vector<int> nums = {10, 14, 6, 7, 8, 15, 1, 9, 12, 11, 3, 4, 5, 13, 2};
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// 升冪排序 (小到大) - 預設比較器
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std::sort(nums.begin(), nums.end());
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for (auto num : nums) {
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std::cout << num << ' ';
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}
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std::cout << std::endl;
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// 降冪排序 (大到小) - 使用自定義比較函式 cmpInt
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std::sort(nums.begin(), nums.end(), cmpInt);
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for (auto num : nums) {
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std::cout << num << ' ';
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}
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std::cout << std::endl;
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// ----------- struct student 排序範例 -----------
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// 建立一個學生 vector
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std::vector<student> students;
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students.push_back(student{2, 60});
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students.push_back(student{1, 100});
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students.push_back(student{4, 70});
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students.push_back(student{5, 80});
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students.push_back(student{3, 90});
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// 用 number (學號) 升冪排序
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std::sort(students.begin(), students.end(), cmpStucdentnumberUp);
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for (auto student : students) {
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std::cout << '(' << student.number << ',' << student.score << ") ";
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}
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std::cout << std::endl;
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// 用 number (學號) 降冪排序
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std::sort(students.begin(), students.end(), cmpStucdentnumberDown);
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for (auto student : students) {
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std::cout << '(' << student.number << ',' << student.score << ") ";
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}
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std::cout << std::endl;
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// 用 score (成績) 升冪排序
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std::sort(students.begin(), students.end(), cmpStucdentScoreUp);
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for (auto student : students) {
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std::cout << '(' << student.number << ',' << student.score << ") ";
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}
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std::cout << std::endl;
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// 用 score (成績) 降冪排序
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std::sort(students.begin(), students.end(), cmpStucdentScoreDown);
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for (auto student : students) {
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std::cout << '(' << student.number << ',' << student.score << ") ";
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}
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std::cout << std::endl;
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return 0;
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}
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