delete pics to save space

1.3435.cpp

@@ -0,0 +1,28 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=1e6+5;
+int n,nxt[maxn]; char a[maxn]; long long res=0;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%s",&n,a+1);
+	nxt[1]=0;
+	for(int i=2,j=0;i<=n;i++)
+	{
+		while(j&&a[i]!=a[j+1]) j=nxt[j];
+		if(a[i]==a[j+1]) j++;
+		nxt[i]=j;
+	}
+	for(int i=2;i<=n;i++)
+	{
+		int j=i;
+		while(nxt[j]) j=nxt[j];
+		if(nxt[i]) nxt[i]=j;
+		res+=i-j;
+	}
+	printf("%lld\n",res);
+	return 0;
+}