me and my broken heart(后缀表达式）

made by 罗旅洲

<span style="font-size:18px;">//3+(5+6)*3-2
//3 5 6 + 3 * + 2 -
#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
int z[10001],k,i,top,n,m,zd;
char s[10001],t[10001],st[10001];
int main(){
    gets(t);
    k=strlen(s);
    for(i=0;i<k;i++)
        switch(t[i])
        {
            case '(':st[++top]='(';break;
            case ')':while(top>0 && st[top]!='(')s[n++]=st[top--];top--;break;
            case '+':
            case '-':while(top>0 && st[top]!='(')s[n++]=st[top--];
                    st[++top]=' ';st[++top]=t[i];break;
            case '*':
            case '/':while(top>0 && st[top]!='(' && st[top]!='+' && st[top]!='-')s[n++]=st[top--];
                    st[++top]=' ';st[++top]=t[i];break;
            default:while(t[i]>='0' && t[i]<='9')
                        s[n++]=t[i++];
                    i--;
                    s[n++]=' ';
        }
    while(top>0)
        s[n++]=st[top--];
    s[n]='\0';
    puts(s);
    k=strlen(s);
    for(i=0;i<k;i++)
        switch(s[i])
        {
            case '+':m=z[zd-1]+z[zd];z[--zd]=m;break;
            case '-':m=z[zd-1]-z[zd];z[--zd]=m;break;
            case '*':m=z[zd-1]*z[zd];z[--zd]=m;break;
            case '/':m=z[zd-1]/z[zd];z[--zd]=m;break;
            default:while(s[i]>='0' && s[i]<='9')
                    {
                        m=m*10+s[i]-48;
                        i++;
                    }
                    z[++zd]=i;
        }
    return 0;
}</span>