some programs!!

dsa/ch3_stack_queue/dsa_0306_stack_operation.cpp

@@ -0,0 +1,46 @@
+#include <iostream>
+#include <stack>
+#include <vector>
+
+using Operation = std::pair<bool, int>;
+
+int n, idx = 0;
+std::stack<int> stack;
+std::vector<int> sequence;
+std::vector<Operation> operation_log;
+
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::cin >> n;
+    operation_log.reserve(2 * n);
+    sequence.resize(n);
+    for (int i = 0; i < n; i++) {
+        std::cin >> sequence[i];
+    }
+
+    for (int current_num = 1; current_num <= n;) {
+        while ((stack.empty() || stack.top() != sequence[idx]) && current_num <= n) {
+            stack.push(current_num);
+            operation_log.emplace_back(false, current_num);
+            current_num++;
+        }
+        while (!stack.empty() && stack.top() == sequence[idx]) {
+            stack.pop();
+            operation_log.emplace_back(true, sequence[idx]);
+            idx++;
+        }
+    }
+    if (!stack.empty()) {
+        std::cout << "NO" << std::endl;
+    } else {
+        for (const auto [op, x] : operation_log) {
+            std::cout << (op ? "POP " : "PUSH ") << x << std::endl;
+        }
+    }
+
+
+    return 0;
+}