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int solve (int n, int r) {
 vector<int> p;
	for (int i=2; i*i<=n; ++i)
		if (n % i == 0) {
 p.push_back (i);
			while (n % i == 0)
 n /= i;
		}
	if (n > 1)
 p.push_back (n);
 
	int sum = 0;
	for (int msk=1; msk<(1<<p.size()); ++msk) {
		int mult = 1,
 bits = 0;
		for (int i=0; i<(int)p.size(); ++i)
			if (msk & (1<<i)) {
				++bits;
 mult *= p[i];
			}
 
		int cur = r / mult;
		if (bits % 2 == 1)
 sum += cur;
		else
 sum -= cur;
	}
 
	return r - sum;
}

prog.cpp: In function 'int solve(int, int)':
prog.cpp:2:2: error: 'vector' was not declared in this scope
  vector<int> p;
  ^
prog.cpp:2:9: error: expected primary-expression before 'int'
  vector<int> p;
         ^
prog.cpp:5:2: error: 'p' was not declared in this scope
  p.push_back (i);
  ^
prog.cpp:10:2: error: 'p' was not declared in this scope
  p.push_back (n);
  ^
prog.cpp:13:26: error: 'p' was not declared in this scope
  for (int msk=1; msk<(1<<p.size()); ++msk) {
                          ^

Standard output is empty