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pojcs101_M03704_brackets.cpp

@@ -0,0 +1,51 @@
+#include <iostream>
+#include <stack>
+#include <vector>
+
+using namespace std;
+
+struct Bracket {
+    bool is_right;
+    size_t index;
+
+    bool operator<(const Bracket& other) const {
+        return index < other.index;
+    }
+};
+
+string get_unmatched_brackets_string(const string& s) {
+    stack<Bracket> brackets;
+    vector<Bracket> unmatched_brackets;
+    string printed_string(s.size(), ' ');
+    for (size_t i = 0; i < s.size(); i++) {
+        if (s[i] == '(') {
+            brackets.push({.is_right = false, .index = i});
+        } else if (s[i] == ')') {
+            if (brackets.empty()) {
+                unmatched_brackets.push_back({.is_right = true, .index = i});
+            } else {
+                brackets.pop();
+            }
+        }
+    }
+    while (!brackets.empty()) {
+        unmatched_brackets.push_back(brackets.top());
+        brackets.pop();
+    }
+    for (const auto& [is_right, index] : unmatched_brackets) {
+        printed_string[index] = is_right ? '?' : '$';
+    }
+    return printed_string;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    string s;
+    while (getline(cin, s) && !s.empty()) {
+        cout << s << endl << get_unmatched_brackets_string(s) << endl;
+    }
+
+    return 0;
+}