delete pics to save space

1.1739.cpp

@@ -0,0 +1,24 @@
+#include<cstdio>
+#include<stack>
+using namespace std;
+stack<char> stk;
+int main()
+{
+	char t;
+	while(t=getchar(),t!='@')
+	{
+		if(t=='(') stk.push('(');
+		else if(t==')')
+		{
+			if(stk.empty())
+			{
+				printf("NO\n");
+				return 0;
+			}
+			if(stk.top()=='(') stk.pop();
+		}
+	}
+	if(stk.size()==0) printf("YES\n");
+	else printf("NO\n");
+	return 0;
+}