http://tyvj.cn/p/2772

此題由於我不喜歡用棧寫表示式（分明是不會），所以用個連結串列亂搞AC了。。

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int sz[100005];//數字 
int bh[100005];//標號，連結串列儲存 
int s_n = 0;
char fh[100005];//符號 
int f_n = 0;
char lastch=' ',ch;
int main () 
{ 
	//freopen("123.in","r", stdin);
	memset(sz, 0, sizeof(sz));
	int i = 0;
	ch = getchar();
	while(ch!='\n')
	{
		if (ch=='+'||ch=='*') fh[++f_n] = ch;
		if (ch>='0'&&ch<='9')
		{
			if(lastch>='0'&&lastch<='9')
			{
				sz[s_n] = (sz[s_n] * 10 + ch - '0') % 10000;
			} else sz[++s_n] = ch - '0';
		}
		lastch = ch;
		ch = getchar();
	} 
	for (int i=1;i<=s_n;i++) bh[i] = i+1;
	bh[s_n] = 10000000;
	for (int i=1;i<=f_n;i++)
	{
		if(fh[i]=='*')
		{
			sz[bh[i]] = sz[i] * sz[bh[i]] % 10000;
			sz[i] = 765428;
		}
	}
	int tot = 0;
	for (int i=1;i<=s_n;i=bh[i])
	{
		if (sz[i]!=765428)
			tot = (tot+sz[i])%10000;
	}
	printf("%d\n", tot);
	return 0;
}