46 lines
1017 B
C++
46 lines
1017 B
C++
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// vector 的删除操作
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#include <bits/stdc++.h>
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using namespace std;
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template <typename T>
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void print(vector<T> &v)
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{
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typename vector<T>::iterator it = v.begin();
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while (it != v.end())
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{
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cout << *it << " ";
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it++;
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}
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cout << endl;
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}
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int main()
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{
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int arr1[5] = {1, 2, 3, 4, 5};
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vector<int> v1(arr1, arr1 + 5);
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print(v1);
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vector<int>::iterator it = v1.begin();
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v1.insert(it, 1, 10); // 在 it 位置插入 1 个 10
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print(v1);
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it = v1.begin(); // 重新获取迭代器，因为之前的迭代器已经失效（插入后迭代器首地址变了）
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v1.erase(it); // 删除 it 位置的元素
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print(v1);
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it = v1.begin();
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v1.erase(it, it + 2); // 删除 [it, it+2) 位置的元素
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print(v1);
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// 清空
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v1.clear();
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v1.empty(); // 判断是否为空
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cout << "清空后：" << endl;
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print(v1);
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cout << "size: " << v1.size() << " capacity: " << v1.capacity() << endl; // size: 0 capacity: 8
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return 0;
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}
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