L1-064 估值一亿的AI核心代码 (20 分)

ac代码：

#include<bits/stdc++.h>
#define f(i,a,b) for(int i=a;i<b;i++)
#define ff(i,a,b) for(int i=a;i<=b;i++)
using namespace std;
int n;
string con(string s){
    while(s[0]==' ')s.erase(s.begin());
    while(s[s.length()-1]==' ')s.erase(s.end()-1);

    for(int i=0;i<s.length();i++){
        if(s[i]==' '){
            while(i+1<s.length() && s[i+1]==' ')s.erase(s.begin()+i+1);
            if(i+1<s.length() && !isalnum(s[i+1]))s.erase(s.begin()+i);
        }
    }

    f(i,0,s.length()){
        if(s[i]>='A'&&s[i]<='Z'&&s[i]!='I')
            s[i]+=32;
    }
    
    for(int pos=0;;pos++){
        pos=s.find("can you",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+7==s.size() || !isalnum(s[pos+7]))){
            s.replace(pos,7,"A can");
        }
    }
    for(int pos=0;;pos++){
        pos=s.find("could you",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+9==s.size() || !isalnum(s[pos+9]))){
            s.replace(pos,9,"A could");
        }
    }
    for(int pos=0;;pos++){
        pos=s.find("I",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+1==s.size() || !isalnum(s[pos+1]))){
            s.replace(pos,1,"you");
        }
    }
    for(int pos=0;;pos++){
        pos=s.find("me",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+2==s.size() || !isalnum(s[pos+2]))){
            s.replace(pos,2,"you");
        }
    }
    
    f(i,0,s.size()){
        if(s[i]=='?')s[i]='!';
        else if(s[i]=='A')s[i]='I';
    }
    return s;
}
int main(){
    cin>>n;
    getchar();
    string s;
    f(line,0,n){
        getline(cin,s);
        cout<<s<<endl;
        cout<<"AI: "<<con(s)<<endl;
    }
}

ac代码（标记坑点）：

#include<bits/stdc++.h>
#define f(i,a,b) for(int i=a;i<b;i++)
#define ff(i,a,b) for(int i=a;i<=b;i++)
using namespace std;
int n;
string con(string s){
    
    //行首尾空格
    while(s[0]==' ')s.erase(s.begin());
    while(s[s.length()-1]==' ')s.erase(s.end()-1);

//    错误示范：（会在第4个测试点段错误）
//    for(int i=0;i<s.length()-1;i++){
//        if(s[i]==' '){
//            //相邻单词间的多个空格换成 1 个空格
//            while(s[i+1]==' ')s.erase(s.begin()+i+1);
//            //标点符号前面的空格,不能用while,会段错误
//            if(!isalnum(s[i+1]))s.erase(s.begin()+i);
//        }
//    }

    for(int i=0;i<s.length();i++){
        if(s[i]==' '){
            //相邻单词间的多个空格换成 1 个空格
            while(i+1<s.length() && s[i+1]==' ')s.erase(s.begin()+i+1);
            //标点符号前面的空格,不能用while,会段错误
            if(i+1<s.length() && !isalnum(s[i+1]))s.erase(s.begin()+i);
        }
    }
    
    f(i,0,s.length()){
        if(s[i]>='A'&&s[i]<='Z'&&s[i]!='I')
//            错误示范：
//            s[i]-=26;
            s[i]+=32;
    }
    
//    错误示范（会超时）：
//    for(int pos=0;;){
    for(int pos=0;;pos++){
        pos=s.find("can you",pos);
        if(pos==-1) break;
//    错误示范：
//        if((!pos || !isalnum(s[pos-1])) && (pos+7!=s.size() || !isalnum(s[pos+7])))
        if((!pos || !isalnum(s[pos-1])) && (pos+7==s.size() || !isalnum(s[pos+7]))){
            s.replace(pos,7,"A can");
        }
    }
    for(int pos=0;;pos++){
        pos=s.find("could you",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+9==s.size() || !isalnum(s[pos+9]))){
            s.replace(pos,9,"A could");
        }
    }
    for(int pos=0;;pos++){
        pos=s.find("I",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+1==s.size() || !isalnum(s[pos+1]))){
//            错误示范：
//            s.replace(pos,9,"you");
            s.replace(pos,1,"you");
        }
    }
    for(int pos=0;;pos++){
        pos=s.find("me",pos);
        if(pos==-1) break;
        if((!pos || !isalnum(s[pos-1])) && (pos+2==s.size() || !isalnum(s[pos+2]))){
            s.replace(pos,2,"you");
        }
    }
    f(i,0,s.size()){
        if(s[i]=='?')s[i]='!';
        else if(s[i]=='A')s[i]='I';
    }
    return s;
}
int main(){
    cin>>n;
    getchar();
    string s;
    f(line,0,n){
        getline(cin,s);
        cout<<s<<endl;
        cout<<"AI: "<<con(s)<<endl;
    }
}