BZOJ3884: 上帝与集合的正确用法
题解:
最近颓的有点儿过了。。。主要是人太弱有点悲伤。。。
正经题解戳出题人吧:http://blog.csdn.net/popoqqq/article/details/43951401
代码:
1 #include<cstdio> 2 #include<cstdlib> 3 #include<cmath> 4 #include<cstring> 5 #include<algorithm> 6 #include<iostream> 7 #include<vector> 8 #include<map> 9 #include<set> 10 #include<queue> 11 #include<string> 12 #define inf 1000000000 13 #define maxn 10000000 14 #define maxm 100000+5 15 #define eps 1e-10 16 #define ll long long 17 #define pa pair<int,int> 18 #define for0(i,n) for(int i=0;i<=(n);i++) 19 #define for1(i,n) for(int i=1;i<=(n);i++) 20 #define for2(i,x,y) for(int i=(x);i<=(y);i++) 21 #define for3(i,x,y) for(int i=(x);i>=(y);i--) 22 #define for4(i,x) for(int i=head[x],y=e[i].go;i;i=e[i].next,y=e[i].go) 23 #define mod 1000000007 24 #define lch k<<1,l,mid 25 #define rch k<<1|1,mid+1,r 26 using namespace std; 27 inline int read() 28 { 29 int x=0,f=1;char ch=getchar(); 30 while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();} 31 while(ch>='0'&&ch<='9'){x=10*x+ch-'0';ch=getchar();} 32 return x*f; 33 } 34 int p[maxn+1],tot,f[maxn+1]; 35 bool v[maxn+1]; 36 inline void get() 37 { 38 f[1]=1; 39 for2(i,2,maxn) 40 { 41 if(!v[i])p[++tot]=i,f[i]=i-1; 42 for1(j,tot) 43 { 44 int k=i*p[j]; 45 if(k>maxn)break; 46 v[k]=1; 47 if(i%p[j])f[k]=f[i]*(p[j]-1); 48 else {f[k]=f[i]*p[j];break;} 49 } 50 } 51 } 52 inline int power(int x,int y,int p) 53 { 54 int t=1; 55 for(;y;y>>=1,x=(ll)x*x%p) 56 if(y&1)t=(ll)t*x%p; 57 return t; 58 } 59 inline int solve(int x) 60 { 61 if(x==1)return 0; 62 int t=0,y=x; 63 while((y&1)==0)y>>=1,t++; 64 return (power(2,(solve(f[y])-t%f[y]+f[y])%f[y],y)<<t)%x; 65 } 66 int main() 67 { 68 freopen("input.txt","r",stdin); 69 freopen("output.txt","w",stdout); 70 get(); 71 int T=read(); 72 while(T--)printf("%d\n",solve(read())); 73 return 0; 74 }