delete pics to save space

2023-08-03 09:22:52 +08:00
commit de60cd6ed4
1334 changed files with 66221 additions and 0 deletions
--- a/2.1644.cpp
+++ b/2.1644.cpp
@ -0,0 +1,29 @@
+#include<cstdio>
+#include<cmath>
+#include<algorithm>
+using namespace std;
+const int maxn=1299709;
+bool vis[maxn+5]={1,1};
+int pri[100005],cnt,n;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	int m=(int)sqrt(maxn+0.5),c=0,i,j;
+	for(i=2;i<=m;i++)
+		if(!vis[i])
+			for(j=i*i;j<=maxn;j+=i) vis[j]=1;
+	for(i=2;i<=maxn;i++)
+		if(!vis[i]) pri[cnt++]=i;
+	while(scanf("%d",&n)==1&&n)
+	{
+		if(!vis[n]) printf("0\n");
+		else
+		{
+			int *p=upper_bound(pri,pri+cnt,n);
+			printf("%d\n",*p-*(p-1));
+		}
+	}
+	return 0;
+}