洛谷 语句解析

#include<bits/stdc++.h>
using namespace std;
string s;
int a,b,c;
int f(int n)
{
    n+=3;
    if(s[n]>='0'&&s[n]<='9')
    return s[n]-'0';
    if(s[n]=='a')
    return a;
    if(s[n]=='b')
    return b;
    if(s[n]=='c')
    return c;
}
 
int main()
{
    cin>>s;
    int len=s.size(),i=0;
    while(i<len)
    {
        if(s[i]=='a')
        {
            a=f(i);
            i+=5;
        }
        
        if(i<len&&s[i]=='b')
        {
            b=f(i);
            i+=5;
        } 
        if(i<len&&s[i]=='c')
        {
            c=f(i);
            i+=5;
        } 
        
    }
    cout<<a<<" "<<b<<" "<<c;
    return 0;
}