C++ reverse()函数用法

#include <bits/stdc++.h>

using namespace std;

//方法一 翻转字符串
void method1()
{
    string s = "i love acm";
    reverse(s.begin(), s.end());
    cout << s << endl;
}

//方法二 翻转整形数组
void method2()
{
    int n, a[100], l, r; //需要翻转的左边界 右边界

    cin >> n;
    for(int i = 1; i <= n; ++i) cin >> a[i];
    cin >> l >> r;

    reverse(a + l, a + r + 1); //这里注意 结束的指针是右边界下标加 1

    for(int i = 1; i <= n; ++i) cout << a[i] << " ";
    cout<<endl;
}

signed main()
{
    method1();
    method2();
    return 0;
}