delete pics to save space

7.3090.cpp

@@ -0,0 +1,31 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=1005;
+int T,kase,n,v[maxn],p[maxn],cnt,phi[maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	for(int i=1;i<maxn;i++) v[i]=i;
+	for(int i=2;i<maxn;i++)
+	{
+		if(v[i]==i) { p[cnt++]=i; phi[i]=i-1; }
+		for(int j=0;j<cnt&&p[j]*i<maxn;j++)
+		{
+			if(p[j]>v[i]) break;
+			v[p[j]*i]=p[j];
+			phi[p[j]*i]=phi[i]*(p[j]<v[i]?p[j]-1:p[j]);
+		}
+	}
+	scanf("%d",&T);
+	for(int i=0;i<T;i++)
+	{
+		scanf("%d",&n);
+		int res=3;
+		for(int i=2;i<=n;i++) res+=phi[i]*2;
+		printf("%d %d %d\n",++kase,n,res);
+	}
+	return 0;
+}