[蓝桥杯][基础练习VIP]字符串对比

思路：按照题意来很顺畅的写了下来，很开心，一发AC。

#include<bits/stdc++.h>

using namespace std;

int main(){
	string s1;
	string s2;
	cin>>s1;
	cin>>s2;
	int len1 = s1.length();
	int len2 = s2.length();
	int flag1=0,flag2=0;
	int flag3=0,flag4=0;
	if(len1 != len2){
		cout<<1<<endl;
		flag1 = 1;
		return 0;
	}
	int res  = 0;
	if(!flag1){
		for(int i=0;i<len1;i++){
			if(s1[i] != s2[i]){
				res = 1;
				break;
			}
		}
		if(!res){
		cout<<2<<endl;
		flag2 = 1;
		return 0;
		}
	}
	if(!flag1 && !flag2){
		for(int i=0;i<len1;i++){
			if(s1[i]>'A' && s1[i]<'Z'){
				s1[i] += 32;
			}
			if(s2[i]>'A' && s2[i]<'Z'){
				s2[i] += 32;
			}
		}
		int f  = 0;
		for(int i=0;i<len1;i++){
			if(s1[i] != s2[i]){
				f = 1;
				break;
			}
		}
		if(!f){
			cout<<3<<endl;
			flag3 = 1;
			return 0;
		}
		
	}
	
	if(!flag1 && !flag2 && !flag3){
		cout<<4<<endl;
	}
	
	return 0;
}