清北学堂模拟赛d3t4 a

分析：很水的一道题，就是用栈来看看是不是匹配就好了，只是最后没有判断栈是否为空而WA了一个点，以后做题要注意了.

#include <bits/stdc++.h>

using namespace std;

stack<int> ss;

char s[100010];
int sizee;
bool flag = true;

int main()
{
    freopen("a.in","r",stdin);
    freopen("a.out","w",stdout);
    scanf("%s",s + 1);
    sizee = strlen(s + 1);
    for (int i = 1; i <= sizee; i++)
    {
        if (s[i] == '(' || s[i] == ')' || s[i] == '['|| s[i] == ']' || s[i] == '{'||s[i] == '}')
            {
                if (s[i] == '(' || s[i] == '['|| s[i] == '{')
                        {
                            if (s[i] == '(')
                                    ss.push(1);
                            else
                            if (s[i] == '[')
                                ss.push(2);
                            else
                            if (s[i] == '{')
                                ss.push(3);
                        }
                        else
                        {
                            int t = ss.top();
                            ss.pop();
                            if (s[i] == ')' && t != 1)
                            {
                                flag = false;
                                break;
                            }
                            else
                                if (s[i] == ']' && t != 2)
                            {
                                flag = false;
                                break;
                            }
                            else
                                if (s[i] == '}' && t != 3)
                            {
                                flag = false;
                                break;
                            }
                        }
            }
    }
    if (flag && ss.empty())
        printf("OK
");
    else
        printf("Wrong
");

    return 0;
}