ACdream 1154 Lowbit Sum (数位dp)
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题目链接:
ACdream 1154
题解:数位
这题可以加深对
你打个表就可以发现规律了。
当
当
AC代码:
/** this code is made by LzyRapx* Problem: 1154* Verdict: Accepted* Submission Date: 2017-06-21 23:56:51* Time: 180MS* Memory: 1664KB*/#include <bits/stdc++.h>using namespace std;typedef long long ll;int lowbit(int x){ return x&(-x);}ll DP(int x){ if(x==1)return 1; return 2*DP(x>>1) + (x>>1) + (x&1); }int main(){ int n =0 ; /* for(int n=1;n<=10;n++){ int ans = 0 ; for(int i=1;i<=n;i++){ ans+=lowbit(i); cout<<lowbit(i)<<" "; } cout<<endl; cout<<ans<<endl; } */ while(~scanf("%d",&n)) { cout<<DP(n)<<endl; } return 0;}
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