题目链接：hdu 4891 The Great Pan

题目大意：给出一个文本，问说有多少种理解方式。

1. $$中间的，(s1+1) * (s2+1) * ...*(sn+1), si表示连续的空格数。

2.{}中间，即 | 的个数+1.

解题思路：模拟。

#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;
const int maxn = 1<<22;
typedef long long ll;

int n, len;
char str[maxn], ch;

bool solve () {
    ll ans = 1, tmp = 1e5;

    for (int i = 0; i < len; i++) {

        ll cnt = 1;
        if (str[i] == ‘$‘) {

            int j;
            for (j = i+1; str[j] != ‘$‘;) {
                ll k = 0;
                while (str[j++] == ‘ ‘)
                    k++;

                if (k)
                    j--;
                if ((k+1) > tmp / cnt)
                    return true;
                /*
                    */

                cnt *= (k+1);

                if (cnt > tmp)
                    return true;
            }
            i = j;
        } else if (str[i] == ‘{‘) {

            i++;
            while (str[i] != ‘}‘) {
                if (str[i++] == ‘|‘)
                    cnt++;
            }

            if (cnt > tmp)
                return true;
        }

        ans *= cnt;
        tmp = 1e5 / ans;
    }

    if (ans > 1e5)
        return true;

    printf("%d\n", (int)ans);
    return false;
}

int main () {
    while (scanf("%d%c", &n, &ch) == 2) {
        len = 0;
        for (int i = 0; i < n; i++) {
            gets(str+len);
            len += strlen(str+len);
        }

        if (solve())
            printf("doge\n");
    }
    return 0;
}