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/p.CH5302.cpp
+++ b/p.CH5302.cpp
@ -0,0 +1,26 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+typedef long long LL;
+const LL mod=1e9;
+const int maxn=305;
+int n; char s[maxn]; LL f[maxn][maxn];
+int main()
+{
+	#ifdef local
+	freopen("pro.in","r",stdin);
+	#endif
+	scanf("%s",s+1); n=strlen(s+1);
+	for(int i=1;i<=n;i++) f[i][i]=1;
+	for(int len=2;len<=n;len++)
+		for(int i=1;i+len-1<=n;i++)
+		{
+			int j=i+len-1;
+			if(s[i]!=s[j]) continue;
+			for(int k=i+2;k<=j-2;k++) (f[i][j]+=f[i+1][k-1]*f[k][j])%=mod;
+			(f[i][j]+=f[i+1][j-1])%=mod;
+		}
+	printf("%lld\n",f[1][n]);
+	return 0;
+}