蓝桥杯 1466: [蓝桥杯][基础练习VIP]字符串对比

#include<iostream>
#include<stdlib.h>
#include<stdio.h>
#include<vector> 
#include<string>
#include<math.h>
#include<algorithm>
#include<cstring>
using namespace std;

int charge_string(string a, string b) {
	if (a.size() != b.size())
		return 1;
	for (int i = 0; i < a.size(); i++) {
		if(a[i]!=b[i]&&abs(a[i]-b[i])!=32)
			return 4;
	}
	for (int i = 0; i < a.size(); i++) {
		if (a[i] != b[i]) {
			return 3;
		}
	}
	return 2;
}

int main(){
	string a, b;
	cin >> a >> b;
	cout << charge_string(a, b);
	return 0;
}