#include <iostream> #include <unordered_map> using namespace std; int main(){ long long f(long long a); int n; char ch; cin>>n; unordered_map<char,int>m; unordered_map<char,int>::iterator iter; for(int i=0;i<n;i++){ cin>>ch; if(m.find(ch)==m.end()){ m[ch] = 1; } else m[ch]++; } int temp = 1; for(iter=m.begin();iter!=m.end();iter++){ temp *= f(iter->second); } cout<<f(n)/temp; return 0; } long long f(long long a){ long long n = 1; for(long long i = 1;i<=a;i++){ n *= i; } return n; }
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