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-rw-r--r--other/repeated_substring_pattern.cpp31
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diff --git a/other/repeated_substring_pattern.cpp b/other/repeated_substring_pattern.cpp
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+// 459. Repeated Substring Pattern
+#include "leetcode.h"
+
+/*
+ * given a string 's', check if it can be constructed by taking a substring of
+ * it and appending multiple copies of the substring together.
+ */
+
+class Solution {
+public:
+ bool repeatedSubstringPattern(string s) {
+ int i = 1, j = 0, n = s.size();
+ vector<int> dp(n + 1, 0);
+ while (i < n) {
+ if (s[i] == s[j])
+ dp[++i] = ++j;
+ else if (!j)
+ i++;
+ else
+ j = dp[j];
+ }
+ return dp[n] && dp[n] % (n - dp[n]) == 0;
+ }
+};
+
+int main() {
+ Solution obj;
+ printf("%d\n", obj.repeatedSubstringPattern("abab")); // expect: 1
+ printf("%d\n", obj.repeatedSubstringPattern("aba")); // expect: 0
+ printf("%d\n", obj.repeatedSubstringPattern("abcabcabcabc")); // expect: 1
+}