HDU4554 叛逆的小明水题

　　题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=4554
　　本来是拿这题的FB的，结果脑残把变量命敲错了，wa一次。。。。
 1 //STATUS:C++_AC_0MS_228KB
 2 #include <functional>
 3 #include <algorithm>
 4 #include <iostream>
 5 //#include <ext/rope>
 6 #include <fstream>
 7 #include <sstream>
 8 #include <iomanip>
 9 #include <numeric>
10 #include <cstring>
11 #include <cassert>
12 #include <cstdio>
13 #include <string>
14 #include <vector>
15 #include <bitset>
16 #include <queue>
17 #include <stack>
18 #include <cmath>
19 #include <ctime>
20 #include <list>
21 #include <set>
22 #include <map>
23 using namespace std;
24 //define
25 #define pii pair<int,int>
26 #define mem(a,b) memset(a,b,sizeof(a))
27 #define lson l,mid,rt<<1
28 #define rson mid+1,r,rt<<1|1
29 #define PI acos(-1.0)
30 //typedef
31 typedef __int64 LL;
32 typedef unsigned __int64 ULL;
33 //const
34 const int N=1000010;
35 const int INF=0x3f3f3f3f;
36 const int MOD=256,STA=8000010;
37 const LL LNF=1LL<<60;
38 const double EPS=1e-8;
39 const double OO=1e15;
40 const int dx[4]={-1,0,1,0};
41 const int dy[4]={0,1,0,-1};
42 const int day[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
43 //Daily Use ...
44 inline int sign(double x){return (x>EPS)-(x<-EPS);}
45 template<class T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
46 template<class T> T lcm(T a,T b){return a/gcd(a,b)*b;}
47 template<class T> inline T Min(T a,T b){return a<b?a:b;}
48 template<class T> inline T Max(T a,T b){return a>b?a:b;}
49 template<class T> inline T Min(T a,T b,T c){return min(min(a, b),c);}
50 template<class T> inline T Max(T a,T b,T c){return max(max(a, b),c);}
51 template<class T> inline T Min(T a,T b,T c,T d){return min(min(a, b),min(c,d));}
52 template<class T> inline T Max(T a,T b,T c,T d){return max(max(a, b),max(c,d));}
53 //End
54 
55 LL phi[N],f[N];
56 int n;
57 
58 void phitable(int n)
59 {
60     int i,j;
61     for(i=0;i<=n;i++)phi[i]=0;
62     phi[1]=1;
63     for(i=2;i<=n;i++)if(!phi[i]){
64         for(j=i;j<=n;j+=i){
65             if(!phi[j])phi[j]=j;
66             phi[j]=phi[j]/i*(i-1);
67         }
68     }
69 }
70 
71 int main()
72 {
73  //   freopen("in.txt","r",stdin);
74     int i,j,m=N-9;
75     phitable(m);
76     f[1]=2;
77     for(i=2;i<=m;i++)
78         f[i]=f[i-1]+phi[i];
79     for(i=1;i<=m;i++)
80         f[i]+=f[i]-1;
81     while(~scanf("%d",&n))
82     {
83         printf("%I64d\n",f[n]);
84     }
85     return 0;
86 }
HDU4554 叛逆的小明 水题

HDU4554 叛逆的小明水题
