程式碼

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <stack>
#include <iostream>
using namespace std;

char s[10000005];
int len;
stack<char> st;
stack<long long> val;

int main(){
    scanf("%s",s);
    len=strlen(s)-1;
    long long ss=atoi(s),b;
    val.push(ss);
    for
 
(int i=0;i<=len;i++){    
        if(s[i]=='+'){
            val.push(atoi(s+i));
            st.push(s[i]);
        }
        if(s[i]=='*'){
            long long top=val.top();val.pop();
            long long now=atoi(s+i+1);
            now%=10000;
            top%=10000;
            val.push(now*top);
        }
    }
    long
 
 long ans(0);
    while(!val.empty()){
        ans+=val.top();val.pop();
        ans%=10000;
    }       
    printf("%lld",ans%10000);
}