我想在vector中对具有奇数索引的数字进行排序(索引从0
开始)。
例如,如果我输入这个数字; 1 6 5 7 3 2 0
,程序必须返回:1 2 5 6 3 7 0
。
我的代码
#include <iostream>
#include <vector>
using namespace std;
int main()
{
int eded, n, _temp;
size_t i;
cout << "Nece eded daxil edeceksiniz?" << endl << ">>> ";
cin >> n;
vector<int> v_eded;
v_eded.reserve(n); // n qeder bosh yer ayiriram vektor-da
cout << "Ededleri daxil edin:" << endl;
for (int i = 0; i < n; i++)
{
cin >> eded;
v_eded.push_back(eded);
}
for (i = 1; i < v_eded.size(); i+=2)
{
if (v_eded[i] > v_eded[i+2])
{
_temp = v_eded[i+2];
v_eded[i+2] = v_eded[i];
v_eded[i] = _temp;
}
}
for (auto j : v_eded)
cout << j << " ";
return 0;
}
它编译时没有任何警告和/或错误。插入eded
后,我按Enter
,程序就会出现此错误:
我无法确定问题所在。请解释一下我的错误以及如何解决这个问题。
最好的问候。
答案 0 :(得分:1)
您使用
进行了超出限制的访问权限if (v_eded[i] > v_eded[i+2])
只有i < v_eded.size()
,而不是i + 2
答案 1 :(得分:1)
这应该或多或少地做到:
#include <boost/iterator_adaptors.hpp>
using namespace std;
template<class Iter>
struct by_2_iterator
: boost::iterator_adaptor<by_2_iterator<Iter>, Iter>
{
by_2_iterator(Iter it, Iter limit)
: by_2_iterator::iterator_adaptor_(it)
, _limit(limit)
{}
private:
struct enabler {}; // a private type avoids misuse
friend class boost::iterator_core_access;
void advance(typename by_2_iterator<Iter>::difference_type n)
{
std::advance(this->base_reference(), n * 2);
}
void increment()
{
auto dist = _limit - this->base_reference();
if (dist == 1) {
++(this->base_reference());
_was_half = true;
}
else {
this->advance(1);
_was_half = false;
}
}
void decrement()
{
if (_was_half) {
--(this->base_reference());
_was_half = false;
}
else {
this->advance(-1);
}
}
private:
Iter _limit;
bool _was_half = false;
};
template<class Iter>
by_2_iterator<Iter>
make_by_2(Iter it, Iter e) {
return by_2_iterator<Iter>(it, e);
}
BOOST_AUTO_TEST_CASE(play_2sort)
{
std::vector<int> v { 1, 6, 5, 7, 3, 2, 0 };
auto b = make_by_2(begin(v)+1, end(v));
auto e = make_by_2(end(v), end(v));
std::sort(b, e);
std::copy(begin(v), end(v), ostream_iterator<int>(cout, ", "));
cout << endl;
}
答案 2 :(得分:0)
我刚编辑了代码,并使用了简单的*select sort*
算法。
#include <iostream>
#include <vector>
using namespace std;
int main()
{
int eded, n, _temp, min_i;
size_t i, j;
cout << "Nece eded daxil edeceksiniz?" << endl << ">>> ";
cin >> n;
vector<int> v_eded;
v_eded.reserve(n); // n qeder bosh yer ayiriram vektor-da
cout << "Ededleri daxil edin:" << endl;
for (int i = 0; i < n; i++)
{
cin >> eded;
v_eded.push_back(eded);
}
for (i = 1; i <= n; i += 2) // or you can replace " n " with v_eded.size()
{
min_i = i;
for (j = i; j < n; j += 2)
{
if (v_eded[j] < v_eded[min_i])
min_i = j;
_temp = v_eded[i];
v_eded[i] = v_eded[min_i];
v_eded[min_i] = _temp;
}
}
cout << endl << endl;
for (auto v : v_eded)
cout << v << " ";
return 0;
}
感谢。