L1-064 AI core code valued at 100 million

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A simple simulation problem , Compare and test the application of some methods , If you can't make good use of it “ wheel ” In fact, it will take a lot of time in the game , Do more harm than good ！
1、 It is suggested to establish a mapping relationship , Easy to find and replace
2、 Use STL In the container “string” Type of replace Member functions
3、 The parts with single function and frequent calls are replaced by sub functions

#include<iostream>
#include<string>
#include<map>
using namespace std;
bool is(char ch) {
    			// Judge whether it is a symbol 
	if (ch >= 'A' && ch <= 'Z')	return false;
	if (ch >= 'a' && ch <= 'z')	return false;
	if (ch >= '0' && ch <= '9')	return false;
	return true;
}
bool ok(string s,int len, int pos) {
    		// Judge whether the word is independent 
	if (pos > 0) {
    
		if (is(s[pos - 1]) && is(s[pos + len]))
			return true;
	}
	else if (is(s[pos + len]))	return true;
		
	return false;
}
int main() {
    
	int N;
	string s1, s2;
	string M[4][2] = {
    			// Establish a mapping relationship , It can effectively reduce the amount of code 
		{
    "can you","& can"},{
    "could you","& could"},{
    "I","you"},{
    "me","you"}		
	};
	cin >> N;
	cin.get();
	while (N--) {
    
		getline(cin, s1);
		s2 = s1;
		while (s2[0] == ' ') s2.erase(s2.begin());			// Delete the beginning of the line 、 Space at the end of line 
		while (s2[s2.size() - 1] == ' ') s2.erase(s2.end()-1);		
		for (int i = 0; i < s2.size(); i++) {
    			// Delete extra spaces between words and symbols 
			if (s2[i] == ' ') {
    
				while (s2[i + 1] == ' ') s2.erase(i + 1, 1);
				if (is(s2[i + 1])) {
    
					s2.erase(i, 1);
					i--;
				}
			}
		}
		for (int i = 0; i < s2.size(); i++) {
    				// Replace caps and question marks 
			if (s2[i] >= 'A' && s2[i] <= 'Z' && s2[i] != 'I')	s2[i] = s2[i] - 'A' + 'a';
			if (s2[i] == '?')	s2[i] = '!';
		}

		for (int i = 0; i < s2.size(); i++) {
    // Replace some words , Be careful could I  and  can I Medium “I” It should not be replaced by “you”
			for (int j = 0; j < 4; j++) {
    
				if (s2.substr(i, M[j][0].size()) == M[j][0] && ok(s2, M[j][0].size(), i))	s2.replace(i, M[j][0].size(), M[j][1]);
			}
		}
		for (int i = 0; i < s2.size(); i++) {
    
			if (s2[i] == '&')	s2[i] = 'I';
		}
		cout << s1 << endl;
		cout << "AI: " << s2 << endl;
	}
	return 0;
}