4-A-reverse

题目

Reverse Write a program which reads a sequence of integers A={a0,a1,…,an−1} and reverse specified elements by a list of the following operation: reverse(b,e): reverse the order of ab,ab+1,…,ae−1

输入

The input is given in the following format. n a0 a1…,an−1 q b1 e1 b2 e2 : bq bq In the first line, n (the number of elements in A) is given. In the second line, ai (each element in A) are given. In the third line, the number of queries q is given and each query is given by two integers biei in the following q lines.

输出

Print all elements of A in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.

样例输入

8
1 2 3 4 5 6 7 8
2
1 6
3 8

样例输出

1 6 5 8 7 2 3 4

题解（代码流程）

#include<bits/stdc++.h>
#include<iostream>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, q;
    cin >> n;
    vector<int> A(n);
    for (int i = 0; i < n; i++)cin >> A[i];
    cin >> q;
    while (q--) {
        int b, e;
        cin >> b >> e;
        reverse(A.begin() + b, A.begin() + e);//对数组范围内b~e的数进行反转
    }
    for (auto e:A) {
        cout << e << " ";
    }
    cout << endl;
    return 0;
}

小结

学会简单运用reverse来反转范围中的元素顺序

reverse(BidirIt first, BidirIt last )
first, last - 要反转的元素的范围
BidirIt 必须满足值可交换 (ValueSwappable) 和 遗留双向迭代器 (LegacyBidirectionalIterator) 的要求。

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