#include <iostream>
using ll = long long;
const ll MOD = 1e9 + 7;
ll qpow(ll a, ll n){
if(n == 0) return 1;
ll res = qpow(a, n / 2); res *= res; res %= MOD;
if(n & 1) res *= a;
return res % MOD;
}
int...
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可能对按键不够熟悉，或者对输入法不够熟练所导致，不要急慢慢来，先打对把准确率提高，然后逐渐的加快速度，最后才能打准打快。
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