AOJ (C++ Programming II)—4-C-swap

4-C-swap

题目

Swap Write a program which reads a sequence of integers A={a0,a1,…,an−1} and swap specified elements by a list of the following operation: swapRange(b,e,t): For each integer k (0≤k<(e−b), swap element (b+k) and element (t+k).

输入

The input is given in the following format.

n

a0 a1…,an−1

q

b1 e1 t1

b2 e2 t2

:

bq eq tq

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 three integers bi ei ti 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

11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7

样例输出

1 8 9 10 5 6 7 2 3 4 11

提示：swap_ranges(A.begin() + b, A.begin()+m,A.begin() + e);

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, t;
        cin >> b >> t >> e;
        swap_ranges(A.begin() + b, A.begin() + t, A.begin() + e);//调用swap_ranges函数，代入三个迭代器参数
    }
    for (auto e:A) {
        cout << e << " ";
    }
    cout << endl;
    return 0;
}

小结

学会运用swap_ranges函数来交换范围中的元素

swap_ranges()

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