依旧暴力

#include<bits/stdc++.h>
using namespace std;

int main()
{
	string s;
	cin >> s;
	if (s == "ABC" || s == "ACB" || s == "BAC" || s == "BCA" || s == "CAB" || s == "CBA") cout << "Yes";
	else cout << "No";
	return 0;
}

数量较少，可以暴力