#include <bits/stdc++.h>

using namespace std;

int main() {

int a;

cin>>a;

int x,y,z;

x=y=z=a/3;

x/=2;

y/=2;

z=x+y+z;

x/=2;

z/=2;

y=y+x+z;

y/=2;

z/=2;

x=x+y+z;

cout<<x<<" "<<y<<" "<<z;

return 0;

}

先模拟，再反推

题目传送门

AC code：

#include <bits/stdc++.h>
using namespace std;
int x, a, b, c;

int main() {
	cin >> x;

	a = b = c = x / 3;

	b /= 2;
	a /= 2;
	c += (b + a);

	a /= 2;
	c /= 2;
	b += (a + c);

	b /= 2;
	c /= 2;
	a += (b + c);

	cout << a << " " << b << " " << c;



	return 0;
}