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FZOI/括号匹配.cpp

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+#include <bits/stdc++.h>
+#define int long long
+using namespace std;
+
+bool f(const string &s)
+{
+    stack<char> st;
+
+    for (char c : s)
+    {
+        if (c == '(' || c == '[')
+        {
+            st.push(c);
+        }
+        else if (c == ')' || c == ']')
+        {
+            if (st.empty())
+            {
+                return false;
+            }
+
+            char top = st.top();
+            st.pop();
+
+            if ((c == ')' && top != '(') || (c == ']' && top != '['))
+            {
+                return false;
+            }
+        }
+    }
+
+    return st.empty();
+}
+
+signed main()
+{
+    string s;
+    cin >> s;
+
+    if (f(s))
+    {
+        cout << "OK" << endl;
+    }
+    else
+    {
+        cout << "Wrong" << endl;
+    }
+
+    return 0;
+}