由 WuK 在 2015-09-02 18:51:20 提交，有效耗时17ms

测试点1 Accepted / 5ms / 12384kB

测试点2 Accepted / 1ms / 12384kB

测试点3 Accepted / 1ms / 12384kB

测试点4 Accepted / 0ms / 12384kB

测试点5 Accepted / 1ms / 12384kB

测试点6 Accepted / 0ms / 12384kB

测试点7 Accepted / 5ms / 12384kB

测试点8 Accepted / 1ms / 12384kB

测试点9 Accepted / 1ms / 12384kB

测试点10 Accepted / 2ms / 12384kB

#include<iostream>

#include<string>

char work(const char &key,const char &ch)

{

const int c=ch-((ch>='A'&&ch<='Z')?'A':'a'),k=key-((key>='A'&&key<='Z')?'A':'a');

return (c-k<0?c-k+26:c-k)+((ch>='A'&&ch<='Z')?'A':'a');

}

int main()

{

std::string k,c;

std::cin>>k>>c;

for(unsigned i=0;i!=c.size();++i)

std::cout<<work(k[i%k.size()],c[i]);

}