【PAT乙级】1048 数字加密 (20 分)

题目地址

#include<cstdio>
#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
string s[15]={"0","1","2","3","4","5","6","7","8","9","J","Q","K"};
int main(void)
{
	string a,b; cin>>a>>b;
	string ans;
	reverse(a.begin(),a.end());
	reverse(b.begin(),b.end());
	while(b.size()<a.size()) b+='0';
	while(a.size()<b.size()) a+='0';
	for(int i=0;i<b.size();i++)
	{
		if((i+1)&1)
		{
			int t=b[i]-'0'+a[i]-'0';
			ans+=s[t%13];
		} 
		else 
		{
			int t=(b[i]-'0')-(a[i]-'0');
			if(t>=0) ans+=s[t];
			else ans+=s[t+10];
		}
	}
	reverse(ans.begin(),ans.end());
	cout<<ans<<endl; 
	return 0;
}
           

#include<cstdio>
#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
string s[15]={"0","1","2","3","4","5","6","7","8","9","J","Q","K"};
int main(void)
{
	string a,b; cin>>a>>b;
	reverse(a.begin(),a.end()),reverse(b.begin(),b.end());
	while(a.size()<b.size())  a+='0';
	while(b.size()<a.size())  b+='0';
	string ans;
	for(int i=0;i<b.size();i++)
	{
		if(i%2)
		{
			int t=b[i]-a[i];
			if(t<0) t+=10;
			ans+=s[t];
		}
		else ans+=s[(b[i]-'0'+a[i]-'0')%13];
	}
	reverse(ans.begin(),ans.end());
	cout<<ans;
}