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| author | crupest <crupest@outlook.com> | 2021-02-23 21:07:19 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2021-02-23 21:07:19 +0800 |
| commit | 185ef9fcb0e59f13e9ee0ccb261693cdaddebab0 (patch) | |
| tree | 3f19388b054fb2a12230706681dd62f077890c51 /works/solutions/leetcode/cpp/10.cpp | |
| parent | ca5a0f8dde5d8d9d7f877a790d05a270cc3224f9 (diff) | |
| download | crupest-185ef9fcb0e59f13e9ee0ccb261693cdaddebab0.tar.gz crupest-185ef9fcb0e59f13e9ee0ccb261693cdaddebab0.tar.bz2 crupest-185ef9fcb0e59f13e9ee0ccb261693cdaddebab0.zip | |
import(solutions): Move leetcode solutions to subdir.
Diffstat (limited to 'works/solutions/leetcode/cpp/10.cpp')
| -rw-r--r-- | works/solutions/leetcode/cpp/10.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/works/solutions/leetcode/cpp/10.cpp b/works/solutions/leetcode/cpp/10.cpp new file mode 100644 index 0000000..fbb5586 --- /dev/null +++ b/works/solutions/leetcode/cpp/10.cpp @@ -0,0 +1,83 @@ +#include <string>
+#include <unordered_map>
+#include <vector>
+
+using std::string;
+
+struct Token {
+ explicit Token(char c) : c(c), isAsterisk(false) {}
+
+ char c;
+ bool isAsterisk;
+};
+
+class Solution {
+public:
+ std::vector<Token> tokens_;
+ std::string s_;
+ std::unordered_map<int, std::unordered_map<int, int>> cache_;
+
+ bool isMatch(string s, string p) {
+ for (auto c : p) {
+ if (c == '*') {
+ tokens_.back().isAsterisk = true;
+ } else {
+ tokens_.push_back(Token{c});
+ }
+ }
+ s_ = s;
+
+ return match(0, 0, s_.size(), tokens_.size());
+ }
+
+ bool cache_match(int s_start, int t_start, int s_length, int t_length) {
+ auto cache = cache_[s_start][t_start];
+ if (cache < 0) {
+ return false;
+ } else if (cache > 0) {
+ return true;
+ } else {
+ auto result = match(s_start, t_start, s_length, t_length);
+ cache_[s_start][t_start] = result;
+ return result;
+ }
+ }
+
+ bool match(int s_start, int t_start, int s_length, int t_length) {
+ if (t_start == t_length)
+ return s_start == s_length;
+
+ const auto &token = tokens_[t_start];
+ if (token.isAsterisk) {
+ if (cache_match(s_start, t_start + 1, s_length, t_length)) {
+ return true;
+ }
+
+ int s_index = s_start;
+ while (s_index < s_length) {
+ if (token.c == '.') {
+ if (cache_match(s_index + 1, t_start + 1, s_length, t_length))
+ return true;
+ } else if (token.c == s_[s_index]) {
+ if (cache_match(s_index + 1, t_start + 1, s_length, t_length))
+ return true;
+ } else {
+ break;
+ }
+ s_index++;
+ }
+
+ return false;
+ } else {
+ if (token.c == '.') {
+ return cache_match(s_start + 1, t_start + 1, s_length, t_length);
+ } else {
+ if (token.c == s_[s_start]) {
+ return cache_match(s_start + 1, t_start + 1, s_length, t_length);
+ } else {
+ return false;
+ }
+ }
+ }
+ }
+};
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