C++学习_集合_六

集合

集合也是有序的容器

#include <set>
#include <iostream>

using namespace std;

int main() {
    set<int> a = {1, 6, 2, 4, 5, 3, 7};
    cout << a.size() << "\n";
    auto it = a.begin();
    for (auto it = a.begin(); it != a.end(); it++) {
        cout << *it << " ";
    }
    return 0;
}

输出结果是

1 2 3 4 5 6 7

插入

可以使用insert来插入

#include <set>
#include <iostream>

using namespace std;

int main() {
    set<int> a = {1, 6, 2, 4, 5, 3, 7};
    cout << a.size() << "\n";
    auto it = a.begin();
    a.insert(10);
    a.insert(4);
    for (auto it = a.begin(); it != a.end(); it++) {
        cout << *it << " ";
    }
    return 0;
}

删除数据

使用erase()函数来删除数据

#include <set>
#include <iostream>

using namespace std;

int main() {
    set<int> a = {1, 6, 2, 4, 5, 3, 7};
    cout << a.size() << "\n";

    a.insert(10);
    a.insert(4);
    auto it = a.begin();
    it++;
    a.erase((it));
    for (auto it = a.begin(); it != a.end(); it++) {
        cout << *it << " ";
    }
    return 0;
}

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