PKU 2752 - Seek the Name, Seek the Frame

PKU/2752 - Seek the Name, Seek the Frame.cpp

@@ -0,0 +1,43 @@
+#include <cstdio>
+#include <cstring>
+
+using namespace std;
+
+#define MAX_L 400000
+
+char P[MAX_L+1];
+int f[MAX_L];
+
+void prefixFunction(){
+	int n = strlen(P), k = 0;
+	f[0] = 0;
+
+	for(int i = 1;i<n;++i){
+		while(k>0 && P[k]!=P[i]) k = f[k-1];
+		if(P[k]==P[i]) ++k;
+		f[i] = k;
+	}
+}
+
+int main(){
+	int ans[MAX_L],sz;	
+
+	while(scanf("%s",P)==1){
+		prefixFunction();
+
+		int L = strlen(P);
+		sz = 0;
+
+		while(L!=0){
+			ans[sz] = L;
+			++sz;
+			L = f[L-1];
+		}
+
+		printf("%d",ans[sz-1]);
+		for(int i = sz-2;i>=0;--i) printf(" %d",ans[i]);
+		printf("\n");
+	}
+
+	return 0;
+}