Bạn kiểm tra lại đề nhé, đề đã yêu cầu nhập rồi nhưng sao lại yêu cầu gán cho 20 phần tử bằng 9, phần tử đầu là 20?

#include <bits/stdc++.h>

using namespace std;

long long a,b;

char st;

int main()

{

cin>>a>>b;

cout<<"Nhap phep tinh:"; cin>>st;

if (st=='+') cout<<a+b;

if (st=='-') cout<<a-b;

if (st=='*') cout<<a*b;

if (st=='/') cout<<a/b;

return 0;

}

minh tap lap trinh pascal ma du sao cung cam mon ban da co long tot

#include <iostream>
using namespace std;
int main()
{
    int n,i,j;
    cout<<"Nhap n="; cin>>n;
    for (i=1; i<=n; i++)
    {
        for (j=i; j<=i+n-1; j++)
            cout<<j<<" ";
        cout<<endl;
    }
    return 0;
}

#include <iostream>
using namespace std;
int main()
{
    int t,m,n,ucln;
    cout<<"Nhap n="; cin>>n;
    cout<<"Nhap m="; cin>>m;
    t=m%n;
    while (t!=0)
    {
        t=n%m;
        n=m;
        m=t;
    }
    ucln=n;
    cout<<ucln;
    return 0;
}

#include <iostream>
using namespace std;
int main()
{
    int n,i,j;
    cout<<"Nhap n="; cin>>n;
    for (i=1; i<=n; i++)
    {
        for (j=i; j<=i+n-1; j++)
            cout<<j<<" ";
        cout<<endl;
    }
    return 0;
}

baba ngon thí

```cpp
#include <iostream>
#include <vector>
#include <algorithm>

int main() {
int n;
std::cout << "Enter the number of integers (n < 10^5): ";
std::cin >> n;

std::vector&lt;int&gt; numbers(n); std::cout &lt;&lt; &quot;Enter &quot; &lt;&lt; n &lt;&lt; &quot; integers: &quot;; for (int i = 0; i &lt; n; ++i) { std::cin &gt;&gt; numbers[i]; } int sumOfOdd = 0; for (int i = 0; i &lt; n; ++i) { if (numbers[i] % 2 != 0) { sumOfOdd += numbers[i]; } } std::sort(numbers.begin(), numbers.end()); std::cout &lt;&lt; &quot;Sum of odd integers: &quot; &lt;&lt; sumOfOdd &lt;&lt; std::endl; std::cout &lt;&lt; &quot;Sorted sequence: &quot;; for (int i = 0; i &lt; n; ++i) { std::cout &lt;&lt; numbers[i] &lt;&lt; &quot; &quot;; } std::cout &lt;&lt; std::endl; return 0;

}
```