栈的五个函数
```cpp
void push(char x){
	s[++TOP] = x;
} 

void pop(){
	--TOP;
}

char top(){
	return s[TOP];
}

int size(){
	return TOP;
}

bool empty(){
	return TOP==0;
}
```


出道萌新

倔强青铜


```cpp
#include<iostream>
#include<string>
using namespace std;
char s[30];
int TOP;
string shabby;

void push(char x){
	s[++TOP] = x;
} 

void pop(){
	--TOP;
}

char top(){
	return s[TOP];
}

int size(){
	return TOP;
}

bool empty(){
	return TOP==0;
}

int main(){
	cin >> shabby;
    for(int i=0;i<shabby.size();i++){
        if(shabby[i]=='(')push(s[i]);
        if(shabby[i]==')'){
            if(empty()){
                cout << "NO";
                return 0;
            }else pop();
        }
        if(shabby[i]=='@')break;
    }
    empty() ? cout << "YES" : cout << "NO";
}
```


题解

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