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author | jack <[email protected]> | 2024-06-14 13:13:15 -0600 |
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committer | jack <[email protected]> | 2024-06-14 13:13:15 -0600 |
commit | d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa (patch) | |
tree | 96df922dae2a5073d9a50ea70c7aae6aa37e3ebe /palindromic_substrings.cpp | |
download | leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.tar.gz leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.zip |
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Diffstat (limited to 'palindromic_substrings.cpp')
-rw-r--r-- | palindromic_substrings.cpp | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/palindromic_substrings.cpp b/palindromic_substrings.cpp new file mode 100644 index 0000000..8de80a0 --- /dev/null +++ b/palindromic_substrings.cpp @@ -0,0 +1,31 @@ +#include "leetcode.h" + +class Solution { +public: + int countSubstrings(string s) { + this->s = s; + int ans = 0, n = s.size(); + dp.resize(n, vector<int>(n, -1)); + for (int i = 0; i < n; i++) + for (int j = i; j < n; j++) + ans += helper(i, j, s); + return ans; + } + +private: + vector<vector<int>> dp; + // string s = "abc"; + int helper(int l, int r, string s) { + if (l > r || l == r) + return 1; + if (dp[l][r] != -1) + return dp[l][r]; + if (s[l] != s[r]) + return dp[l][r] = 0; + if (helper(l + 1, r - 1, s)) + return dp[l][r] = 1; + return dp[l][r] = 0; + } +}; + +int main() {} |