LeetCode2514.统计同位异构字符串数目

题目简单，关键是灵茶山艾府的代码写起来太优美，不得不记录一下

const int Mod = 1e9+7;
using ll = long long;
ll qmi(ll a,ll b,ll mod){
    ll res =1;
    while(b){
        if(b&1)res = res*a%mod;
        a=a*a%mod;
        b>>=1;
    }
    return res;
}

class Solution {
public:
    int countAnagrams(string s) {
        int cnt[30]{};
        int j = 0;
        long long ans = 1ll,mul=1ll;
        for(int i=0;i