From a318045cf5c15cadad5c067ab6af5aa498bd155e Mon Sep 17 00:00:00 2001
From: Haidong Ji
Date: Tue, 1 Jan 2019 21:08:58 -0600
Subject: Check bracket done!

Switching from Eclipse to Jetbrains IDEA, still using TDD methods. So far not bad. I like the fact that by using different IDEs, I can see what kind of help the IDE provides (coding style, best practices, etc.). That can be helpful.
---
 src/main/Bracket.java | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/main/Bracket.java

(limited to 'src/main')

diff --git a/src/main/Bracket.java b/src/main/Bracket.java
new file mode 100644
index 0000000..e76eeba
--- /dev/null
+++ b/src/main/Bracket.java
@@ -0,0 +1,51 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.Stack;
+
+public class Bracket {
+
+    static String checkBracket(String exp) {
+        Stack<Character> charStack = new Stack<>();
+        int unmatchedOpeningBracket = 0;
+        int count = 0;
+        for (int i = 0; i < exp.length(); i++) {
+            char c = exp.charAt(i);
+            if (!Arrays.asList('[', ']', '(', ')', '{', '}').contains(c)) {
+                count = count + 1;
+                continue;
+            }
+
+            if (c == '[' || c == '(' || c == '{') {
+                charStack.push(c);
+                count = count + 1;
+                unmatchedOpeningBracket = count;
+            } else {
+                if (charStack.empty())
+                    return Integer.toString(i + 1);
+                char top = charStack.pop();
+                if ((top == '[' && c != ']') || (top == '(' && c != ')') || (top == '{' && c != '}')) {
+                    return Integer.toString(i + 1);
+                } else {
+                    unmatchedOpeningBracket = unmatchedOpeningBracket - 1;
+                }
+                count = count + 1;
+            }
+        }
+        if (charStack.empty())
+            return "Success";
+        else if (unmatchedOpeningBracket > 0) {
+            return Integer.toString(unmatchedOpeningBracket);
+        }
+        return Integer.toString(count);
+    }
+
+    public static void main(String[] args) throws IOException {
+        InputStreamReader input_stream = new InputStreamReader(System.in);
+        BufferedReader reader = new BufferedReader(input_stream);
+        String text = reader.readLine();
+
+        System.out.println(checkBracket(text));
+    }
+}
-- 
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