Amount n element in C++

Question

Necessary to create the program removing amount n element in C++. example :
n=2
1
2
1+2

n=3
1
2
3
1+2
1+3
2+3
1+2+3

n=4
1
2
3
4
1+2
1+3
1+4
2+3
2+4
3+4
1+2+3
1+2+4
2+3+4
1+2+3+4

and etc.
thank you for attention .

P.S. I bad understand english so has translated in program for translation .

Answer 1

Here we go, my friend. Had too much brain farting! 8D

#include <iostream>
#include <vector>
using namespace std;

int main()
{
int n,
i = 0,
group = 1;

do {
cout << "Enter the n (between 1 and 10): "; cin >> n;
} while (!(n >= 1 && n <= 10));

vector<int> v(n + 1);
for (auto &filler : v) filler = i++;

while (group < v.size()) {
size_t x = 0;
while (x < v.size()) { // **Not optimized**Need more thought**
size_t var_part = x + group;
while (var_part < v.size()) {

// fill the constant part of the series
for (size_t y = x + 1; y < (x + group); ++y)
cout << v[y] << " + ";
// fill the variable part of the series
if (var_part < v.size())
cout << v[var_part++] << endl;
else
break;
}
if (group == 1) x = v.size();
else ++x;
}
++group;
}
}

Sample output for n = 5

Enter the n (between 1 and 10):
1
2
3
4
5
1 + 2
1 + 3
1 + 4
1 + 5
2 + 3
2 + 4
2 + 5
3 + 4
3 + 5
4 + 5
1 + 2 + 3
1 + 2 + 4
1 + 2 + 5
2 + 3 + 4
2 + 3 + 5
3 + 4 + 5
1 + 2 + 3 + 4
1 + 2 + 3 + 5
2 + 3 + 4 + 5
1 + 2 + 3 + 4 + 5

______
https://code.sololearn.com/c0SzS97nRl05

Answer 2

Don't worry I'll try and prepare an example for you to produce the same output as in the question.

Answer 3

We do. But we get motivated when we see your attempt along with the problem description. Have you tried to implement it?

Answer 4

I tried , but can't 😔 . algorithm very difficult .

Answer 5

Good , very good . Thank you very much .

Отлично , очень хорошо . Огромное спасибо .