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2 years ago
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// четырехзначное число
#include <iostream>
using namespace std;
int main()
{
int a;
cin >> a;
if ((a / 1000) - (a % 10) == (a / 100) - ((a / 1000) * 10) + (((a % 100) - (a % 10)) / 10 ))
{
cout << "YES";
}
else
{
cout << "NO";
}
return 0;
}
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