Experimental Educational Round: VolBIT Formulas Blitz(J)打表找规律
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题意:1-n中能整除2-10的数字个数
题解:很明显,数字太大不能枚举,那么打个表,发现周期是2520
#include<iostream>#include<cstdio>#include<cstring>#include<algorithm>#include<vector>#include<set>#include<string>using namespace std;#define N 1000+5typedef long long LL; int main(){#ifdef CDZSCfreopen("i.txt","r",stdin);#endifLL n;cin>>n;printf("%lld\n",n/2520);return 0;}
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