求助，写老师100分代码只得30

#include<bits/stdc++.h>
using namespace std;
int p1,p2,p3;
string str;
int main(){
    cin>>p1>>p2>>p3;
    cin>>str;
    stringstream res;
    for(int i=0;i<str.size();i++){
    	if(i==0||i==str.length()-1){
    		res<<str[i];
    		continue;
		}
		if(str[i]=='-'){
			char left=str[i-1];
			char right=str[i+1];
		
			if(left>=right){
				res<<'-';
				continue;
			}
			if((islower(left)&&islower(right)) || (isdigit(left) && isdigit(right))){
				if(p3==1){
					for(char ch=left+1;ch<right;ch++){
						for(int j=0;i<p2;j++){
							if(p1==1){
								res<<ch;
							}else if(p1==2){
								res<<char(toupper(ch));
							}else if(p1==3){
								res<<'*';
							}
						}
					}
				}else if(p3==2){
					for(char ch=right-1;ch<left;ch--){
						for(int j=0;j<p2;j++){
							if(p1==1){
								res<<ch;
							}else if(p1==2){
								res<<char(toupper(ch));
							}else if(p1==3){
								res<<'*';
							}
						} 
					}
				}
			}else{
				res<<'-';
			}
		}else{
			res<<str[i];
		}
	}
	cout<<res.str()<<endl;
	return 0;
}