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Merge pull request #2203 from fwqaaq/master
Update 0647.回文子串.md about rust
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@ -521,8 +521,51 @@ function expandRange(s: string, left: number, right: number): number {
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}
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```
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Rust:
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```rust
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impl Solution {
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pub fn count_substrings(s: String) -> i32 {
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let mut dp = vec![vec![false; s.len()]; s.len()];
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let mut res = 0;
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for i in (0..s.len()).rev() {
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for j in i..s.len() {
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if s[i..=i] == s[j..=j] && (j - i <= 1 || dp[i + 1][j - 1]) {
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dp[i][j] = true;
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res += 1;
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}
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}
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}
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res
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}
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}
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```
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> 双指针
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```rust
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impl Solution {
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pub fn count_substrings(s: String) -> i32 {
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let mut res = 0;
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for i in 0..s.len() {
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res += Self::extend(&s, i, i, s.len());
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res += Self::extend(&s, i, i + 1, s.len());
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}
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res
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}
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fn extend(s: &str, mut i: usize, mut j: usize, len: usize) -> i32 {
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let mut res = 0;
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while i < len && j < len && s[i..=i] == s[j..=j] {
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res += 1;
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i = i.wrapping_sub(1);
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j += 1;
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}
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res
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}
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}
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```
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<p align="center">
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<a href="https://programmercarl.com/other/kstar.html" target="_blank">
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