'commit'

LuoGu/RuMen/P1739.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+stack<char> _a;
+
+int main() {
+    ios::sync_with_stdio(false); //读入输出优化的强迫症
+    string str = "";
+    cin >> str;
+    for (int i = 0; i < str.size(); i++) {
+        if (str[i] == '@') break;
+        if (str[i] == '(') _a.push(str[i]);
+        if (str[i] == ')') {
+            if (!_a.empty()) {
+                _a.pop();
+            } else {
+                cout << "NO" << endl;
+                return 0;
+            }
+        }
+    }
+    if (_a.empty()) cout << "YES" << endl;//判断有没有多余的(
+    else cout << "NO" << endl;//也就是判断栈是否为空
+    return 0;
+}