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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 | d8f3b40085619cb680c8f227c65a1f5acc393223 (patch) | |
| tree | 6a38e3a6c79276fc396259ef962d17236dbed569 /leetcode/cpp/20.cpp | |
| parent | b0162802ad9723c678e495f29ca2f0fc0af2eff1 (diff) | |
| download | solutions-d8f3b40085619cb680c8f227c65a1f5acc393223.tar.gz solutions-d8f3b40085619cb680c8f227c65a1f5acc393223.tar.bz2 solutions-d8f3b40085619cb680c8f227c65a1f5acc393223.zip | |
Move leetcode solutions to subdir.
Diffstat (limited to 'leetcode/cpp/20.cpp')
| -rw-r--r-- | leetcode/cpp/20.cpp | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/leetcode/cpp/20.cpp b/leetcode/cpp/20.cpp new file mode 100644 index 0000000..e994e96 --- /dev/null +++ b/leetcode/cpp/20.cpp @@ -0,0 +1,55 @@ +#include <string>
+
+using std::string;
+
+#include <stack>
+
+class Solution
+{
+public:
+ inline static char get_companion(char c)
+ {
+ switch (c)
+ {
+ case ')':
+ return '(';
+ case ']':
+ return '[';
+ default:
+ return '{';
+ }
+ }
+
+ bool isValid(string s)
+ {
+ std::stack<char> stack;
+
+ for (const auto c : s)
+ {
+ switch (c)
+ {
+ case '(':
+ case '[':
+ case '{':
+ {
+ stack.push(c);
+ break;
+ }
+ case ')':
+ case ']':
+ default:
+ {
+ if (stack.empty())
+ return false;
+ const auto top = stack.top();
+ const char companion = get_companion(c);
+ if (top != companion)
+ return false;
+ stack.pop();
+ }
+ }
+ }
+
+ return stack.empty();
+ }
+};
|