delete pics to save space

7.2185.cpp

@@ -0,0 +1,41 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+int R,C;
+char a[10005][80],buf[10005];
+inline int gcd(int a,int b) { return b?gcd(b,a%b):a; }
+inline int lcm(int a,int b) { return a/gcd(a,b)*b; }
+inline int Get(char *s,int n)
+{
+	static int nxt[10005];
+	nxt[1]=0;
+	for(int i=2,j=0;i<=n;i++)
+	{
+		while(j&&s[i]!=s[j+1]) j=nxt[j];
+		if(s[i]==s[j+1]) j++;
+		nxt[i]=j;
+	}
+	return n-nxt[n];
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d",&R,&C);
+	int clen=1,rlen=1;
+	for(int i=0;i<R;i++) scanf("%s",a[i]);
+	for(int i=0;i<R;i++)
+	{
+		clen=lcm(clen,Get(a[i]-1,C));
+		if(clen>=C) { clen=C; break; }
+	}
+	for(int i=0;i<C;i++)
+	{
+		for(int j=0;j<R;j++) buf[j]=a[j][i];
+		rlen=lcm(rlen,Get(buf-1,R));
+		if(rlen>=R) { rlen=R; break; }
+	}
+	printf("%d\n",rlen*clen);
+	return 0;
+}