第三个测试点有点小坑，具体看以下网址
https://blog.csdn.net/Yvonne_78/article/details/134039947

写了快一个小时，希望今年别遇到这种题，

#include <iostream>

using namespace std;
string x;
int n;

bool findNot( int i ){
    if( i < 0 || i > x.size() - 1 ) return true;
    char a = x[i];
    if( a < '0' || ( a >'9' && a < 'A' ) || ( a > 'Z' && a < 'a' ) || a > 'z' ) return true;
    else return false;
}

void Replace( string a, string b ){
    int len1 = a.size();
    int len2 = b.size();

    for( int p = 0; p = x.find(a, p ), p != -1; p += len1 ){
        if( findNot( p - 1 ) && findNot( p + len1 ) ){
            x.erase( p, len1 );
            x.insert( p, b);
        }
    }
}

int main(){

    scanf("%d", &n );
    getchar();

    while( n -- ){
        getline( cin, x );
        cout << x << endl;

        //去空格
        while( x[0] == ' ' ) x.erase( 0, 1 );
        while( x[x.size()  - 1] == ' ' ) x.erase( x.size()  - 1, 1 );

        for( int i = 0; i < x.size(); i ++ ){
            while( x[i] == ' ' && findNot( i + 1 ) ) x.erase( i , 1 );
        }

        //转换大小写
        for( int i = 0; i < x.size(); i ++ ){
            if( x[i] >= 'A' && x[i] <= 'Z' && x[i] != 'I' ) x[i] += ( 'a' - 'A' );
        }

        //替换
        Replace( "I", "yoU" );
        Replace( "me", "yoU" );
        Replace( "can you", "I can" );
        Replace( "could you", "I could" );

        for( int i = 0; i < x.size(); i ++ ){
            if( x[i] == '?' ) x[i] = '!';
        }

        for( int i = 0; i < x.size(); i ++ ){
            if( x[i] >= 'A' && x[i] <= 'Z' && x[i] != 'I' ) x[i] += ( 'a' - 'A' );
        }


        cout << "AI: " << x << endl;
    }

}