diff options
| author | crupest <crupest@outlook.com> | 2020-08-17 20:49:29 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2020-08-17 20:49:29 +0800 |
| commit | a2ef39abaf763d81fc7cee30a938949d13882897 (patch) | |
| tree | 156ed4c6d9ab7b2b0f2b1c0fcc99f4990b002288 /works/solutions/cpp | |
| parent | de3af9e609783938250466943fd093d9b2d7f879 (diff) | |
| download | crupest-a2ef39abaf763d81fc7cee30a938949d13882897.tar.gz crupest-a2ef39abaf763d81fc7cee30a938949d13882897.tar.bz2 crupest-a2ef39abaf763d81fc7cee30a938949d13882897.zip | |
import(solutions): Add problem 20 .
Diffstat (limited to 'works/solutions/cpp')
| -rw-r--r-- | works/solutions/cpp/20.cpp | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/works/solutions/cpp/20.cpp b/works/solutions/cpp/20.cpp new file mode 100644 index 0000000..e994e96 --- /dev/null +++ b/works/solutions/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();
+ }
+};
|