delete pics to save space

2.1363.cpp

@@ -0,0 +1,31 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+inline long long sum(int a,int d,int n)
+{
+	return (2ll*a-n*d)*(n+1)/2;
+}
+int n,k,i,q,p,cnt;
+long long res;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif 
+	while(scanf("%d%d",&n,&k)==2)
+	{
+		i=1;
+		res=0;
+		while(i<=n)
+		{
+			q=k%i;
+			p=k/i;
+			cnt=n-i;
+			if(p>0) cnt=min(cnt,q/p);
+			res+=sum(q,p,cnt);
+			i+=cnt+1;
+		}
+		printf("%lld\n",res);
+	}
+	return 0;
+}